Thundersoft TurboX® D845 SOM Datasheet Rb3 Hardware User Manual
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1
Qualcomm® Robotics RB3
Platform
Hardware User Manual
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Table of Contents
1 Introduction ........................................................................................................................................................ 6
1.1 Board overview .................................................................................................................................... 8
2 What’s in the Box .............................................................................................................................................. 9
3 Getting started ................................................................................................................................................. 10
3.1 Prerequisites ....................................................................................................................................... 10
3.2 Starting the board for the first time .................................................................................................... 10
3.2.1 Starting process for LE OS ........................................................................................................ 10
4 DragonBoard 845c Overview ............................................................................................................................ 12
4.1 System Block diagram ....................................................................................................................... 12
4.2 Processor ............................................................................................................................................ 12
4.3 Memory ............................................................................................................................................. 12
4.4 MicroSD ............................................................................................................................................ 13
4.5 WiFi/BT RF ....................................................................................................................................... 13
4.6 Display Interface ................................................................................................................................ 14
4.6.1 HDMI ......................................................................................................................................... 14
4.6.2 MIPI-DSI ................................................................................................................................... 15
4.7 Camera Interfaces .............................................................................................................................. 15
4.8 USB Ports .......................................................................................................................................... 15
4.8.1 USB-Host ports ........................................................................................................................ 16
4.8.2 USB-Device port ...................................................................................................................... 16
4.9 Audio ................................................................................................................................................. 16
4.9.1 BT Audio ................................................................................................................................... 16
4.9.2 HDMI Audio .............................................................................................................................. 16
4.9.3 DisplayPort Audio .................................................................................................................... 17
4.10 DC-power and Battery Power ............................................................................................................ 17
4.11 Measurements .................................................................................................................................... 17
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4.12 Buttons ............................................................................................................................................... 17
4.13 External Fan connection .................................................................................................................... 17
4.14 UART ................................................................................................................................................. 17
4.15 System and user LEDs ....................................................................................................................... 18
4.16 Expansion Connector ......................................................................................................................... 18
4.17 Additional Functionality .................................................................................................................... 18
4.17.1 Ethernet Connector ................................................................................................................. 19
4.17.2 Inertial Sensors ........................................................................................................................ 19
4.17.3 Dip Switch ................................................................................................................................ 19
4.17.4 Extra High Speed Expansion Connector ............................................................................. 20
4.17.5 Extra Low Speed Expansion Connectors ............................................................................ 20
5 Low speed Expansion connector .................................................................................................................. 21
5.1 Primary Low Speed Expansion Connector: LS1 ⑩ ......................................................................... 21
5.1.1 UART {0/1} ............................................................................................................................... 22
5.1.2 I2C {0/1} .................................................................................................................................... 23
5.1.3 GPIO {A-L} ............................................................................................................................... 23
5.1.4 SPI ............................................................................................................................................. 23
5.1.5 PCM/I2S ................................................................................................................................... 23
5.1.6 Power and Reset ..................................................................................................................... 24
5.1.7 Power Supplies ........................................................................................................................ 24
5.2 Secondary Low Speed Connector:LS2 ⑩ ........................................................................................ 24
5.2.1 Headset ...................................................................................................................................... 26
5.2.2 Stereo speaker ............................................................................................................................ 26
5.2.3 Digital Microphones .................................................................................................................. 27
5.2.4 CAN ........................................................................................................................................... 27
5.2.5 I2S .............................................................................................................................................. 28
5.2.6 GPIOs ........................................................................................................................................ 28
5.2.7 Other signals on Secondary Low Speed Connector ................................................................... 28
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5.3 Tertiary Low Speed Connector:LS3 ⑪ ............................................................................................. 29
5.3.1 SSC SPI ..................................................................................................................................... 29
5.3.2 SSC I2C ..................................................................................................................................... 30
5.3.3 Sensor interrupt .......................................................................................................................... 30
5.3.4 Other signals on Tertiary Low Speed Connector ....................................................................... 31
6 High speed expansion connectors ............................................................................................................... 32
6.1 Primary High Speed expansion connector: HS1 ⑥ .......................................................................... 32
6.1.1 MIPI DSI 0 ................................................................................................................................ 35
6.1.2 MIPI CSI {0/1} .......................................................................................................................... 35
6.1.3 I2C {2/3} ................................................................................................................................... 36
6.1.4 HSIC .......................................................................................................................................... 36
6.1.5 Reserved .................................................................................................................................... 36
6.1.6 SD/SPI ....................................................................................................................................... 36
6.1.7 Clocks ........................................................................................................................................ 36
6.1.8 USB............................................................................................................................................ 37
6.2 Secondary High Speed Connector: HS2⑫ ....................................................................................... 37
6.2.1 MIPI CSI {1/2} .......................................................................................................................... 39
6.2.2 Clock .......................................................................................................................................... 39
6.2.3 SPI{SSC_SPI2} ......................................................................................................................... 40
6.2.4 PCIe1 ......................................................................................................................................... 40
6.2.5 USB............................................................................................................................................ 41
6.2.6 Other signals on Secondary High Speed Connector .................................................................. 41
7 Power management........................................................................................................................................ 43
7.1 DC Power Input ................................................................................................................................. 43
7.2 Power Source Selection ..................................................................................................................... 44
7.3 Power Sequencing ............................................................................................................................. 44
7.4 Power Measurements ......................................................................................................................... 44
7.5 DC-In measurement ........................................................................................................................... 44
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7.6 PMIC Power-In measurement ............................................................................................................ 44
8 Buttons and status LED’s .................................................................................................................................. 46
8.1 Buttons ............................................................................................................................................... 46
8.1.1 Volume up .................................................................................................................................. 46
8.1.2 Volume down ............................................................................................................................. 46
8.1.3 Power Button ............................................................................................................................. 46
8.1.4 Reset Button ............................................................................................................................... 46
8.1.5 Force_USB_BOOT Button ........................................................................................................ 47
8.2 LED’s ................................................................................................................................................. 47
8.2.1 User LED 1-4 ............................................................................................................................. 47
8.2.2 Bluetooth status ......................................................................................................................... 47
8.2.3 WiFi status ................................................................................................................................. 47
8.2.4 Power Indicator LED ................................................................................................................. 47
9 Boot configuration ............................................................................................................................................. 48
10 Mechanical specification ........................................................................................................................... 49
10.1 Board dimensions .............................................................................................................................. 49
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1 Introduction
The Qualcomm Robotics RB3 Platform is a dedicated robotics platform designed to accelerate computing and
intelligence capabilities for consumer and industrial robotics.It supports the development of smart, power-efficient
and cost-effective robots by combining high-performance heterogeneous computing, Qualcomm® Artificial
Intelligence (AI) Engine for on-device machine learning, computer vision, voice interface, multimedia and
connectivity.The hardware of this platform mainly consists of DragonBoard™ 845c, navigation mezzanine and
cellular mezzanine.
The DragonBoard™ 845c development board is a 96Boards compliant community board based on Qualcomm®
Snapdragon™ 845 processor(SDA845).
The following table lists its key features:
SoC
Qualcomm® Snapdragon™ 845 platform (SDA845)
CPU
Custom 64-bit ARM v8-compliant octa-core CPU Up to 2.8 GHz, 10nm LPP FinFET process
technology
GPU
Adreno™ 630 GPU
OpenGL™ ES 3.2 + AEP , DX next, Vulkan® 2, OpenCL™ 2.0 full profile, RenderScript
DSP
Hexagon™ 685 DSP
RAM
4GB LPDDR4x SDRAM @ 1866 MHz
Storage
64GB UFS 2.1 on board storage and MicroSD card slot
Ethernet
1x GbE Ethernet
Wireless
WLAN 802.11a/b/g/n/ac 2.4/5Ghz 2×2 MIMO & Bluetooth 5.0, On board WLAN/BT/GPS
antennas.
USB
1 x USB 2.0 Micro B (Debug only )
1 x USB 3.0 Type C (OTG mode)
2 x USB 3.0 Type A (Host mode only)
Display
Two 4-lane DSI, D-PHY 1.2 or C-PHY 1.0; VESA DSC 1.1
1 x HDMI 1.4 (Type A - full) connector
Video
4K60 decode for H.264 High Profile, H.265 Main 10 Profile and VP9 Profile 2
4K60 encode for H.264 High Profile, H.265 Main 10 Profile
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Audio
MP3; aacPlus, eAAC; WMA 9/Pro
Camera
Qualcomm Spectra™ 280 ISP, dual 14-bit ISP+one Lite ISP, 32 MP 30 fps ZSL with a dual ISP
Sensor
Accelerometer + Gyro Sensor/ Proximity sensor
Expansion
Interface
Expansion Connectors:
HS1:1 x 60 pin High-Speed connector (4L-MIPI DSI, USB 2.0 x 2, I2C x 2, 2L+4L-MIPI CSI)
HS2:1 x 60 pin High-Speed connector (4L-MIPI CSI x 2, SSC SPI, PCIe 3.0, USB 3.0 x 1, GPIO
x 9)
LS1:1x 96boards 40 pin Low-Speed connector (UART x 2, SPI, I2S, I2C x2, GPIO x 12, DC
power)
LS2:1 x 96boards 40 pin Low-Speed connector (headset, stereo speaker, DMIC I/F x 3, CAN, I2S,
GPIO x 7, PWM x 2, ADC x 2)
LS3:1 x 96boards 20 pin Low-Speed connector (SSC SPI x 3, SSC I2C, sensor interrupt x 5)
LED
7 LED indicators:
4 - user controllable
2 - for radios (BT and WLAN activity)
1 -power indicator
Button
Power, Volume Up/Down, Force Usb Boot, Dip Switch (6 PIN)
Power Source
12V@2.5A adapter with a DC plug:
Plug specification is inner diameter 1.75mm and outer diameter is 4.75mm
OS Support
Linux Embedded (LE)
Mechanical &
Environmental
85mm by 54 mm meeting 96Boards™ Consumer Edition Standard form dimensions
specifications
Operating Temp: -20°C to +70°C
RoHS and Reach compliant
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1.1 Board overview
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2 What’s in the Box
The box contains one DragonBoard 845c development board and a Quick Start Guide.
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3 Getting started
3.1 Prerequisites
Before you power up your DragonBoard 845c for the first time you will need the following:
• DragonBoard 845c development board
o Board based on Qualcomm® Snapdragon™ 845 processor
• Power adapter
o 96Boards specification requires a 12V with 2500mA power adapter
• USB to micro USB cable
o This is needed for serial console interface and fastboot/adb commands
• USB to USB Type C cable
o This is needed to connect the USB3.0 Type C port and flash the images
• Host PC
o This is needed to connect the DragonBoard and have fastboot installed
3.2 Starting the board for the first time
3.2.1 Starting process for LE OS
To start the board, follow these simple steps (Display is not supported in the LE OS):
• Step 1: Open the serial console tool on the Host PC.(for example:minicom)
• Step 2: Enable the USB2.0 debug port by turning on the SW2 of the Dip Switch ⑮
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• Step 3: Connect the Micro-B plug on the USB cable to the USB2.0 debug port ㉑ on the device,and
the other end to an available USB port on the host PC
Note: please set the Bps/Par/Bits to 115200 8N1
• Step 4: Connect the power supply to power connector ⑬
• Step 5: Plug the power supply into a power outlet,and “power up” green Led should illuminate
• Step 6: Press and release the power button on the device,and user yellow Led0 should illuminate
The board will start the booting process, and you should see Login Credentials displayed on the host PC:
sda845 login: root
Password: 123456
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4 DragonBoard 845c Overview
4.1 System Block diagram
4.2 Processor
The Snapdragon 845 processor has a 64-bit ARM v8-compliant octa-core Qualcomm® Kryo™ 385 CPU, supports
LPDDR4X SDRAM interface, Compute DSP with Hexagon Vector eXtensions, 32MP camera, Adreno 630 GPU, 4K
video encode/decode, Bluetooth 5.0.
4.3 Memory
HDMI
Turbox-845 SOM
SLIMBUS
RF
connectors
SSC
UART
I2C x 2
SPI
SDC2
DSI0
DSI1
Secondary
USB
(Type 2/3)
Primary
USB Type
2/3/C
PCIe0
CSI0
CSI3
CSI1
MI2S
POP memory
LPDDR4x 4GB
UFS FLASH 64GB
WCD9340
WSA8810
MICs
Low speed expansion 2
BT
Invensense
ICM-42688
LTR-553
Prox Sensor
SPI
I2C
FT230XQ-R
UART to USB
USB
uUSB
2.0
Buttons
(power/volume)
SPI
I2C x 2
SD
card
SDC2
SPI to CAN SPICAN
MIPI to HDMI
LT9611
DSI0
HDMI
Type-A
DIP switches
DSI – 4 lane
USB Type C
DP/DM
DP/DM
PCIe
To
USB
PCIe Gen2
USB
to
LAN
CSI2
USB 3.0
RJ45 High speed expansion 2
CSI0 – 4 lane
CSI3 – 2 lane
CSI2 – 4 lane
MI2S
USB 3.0
Type A
USB 3.0
WLAN0
WLAN1
USB 3.0
SDC4 SDC
CCI I2C x 2 I2C x 2
QUP5
CAM MCLK
GPIO x 2 CAM MCLKs
CAM MCLK
GPIO x 2 CAM MCLKs x 2
SSC SPI SPI
QUP/GPIOs x 12
UART x 2
PCM/I2S
UART x 2
QUP/GPIO x 12
SPKR
PCIe1
USB 3.0
Type A
SS LANES
SS LANES x 2
GPIOs x 10 CAMERA RESET/CONTROL GPIOs
USB VBUS USB_VBUS
TPS54428
12V
DC Jack
VBAT
4V
WSA8810
PCM
QUP
VBAT
DSI Switch
FS644
DSI1
DSI1
USB3.0 USB 3.0
Low speed expansion 3
Extra SPI CS, Extra INT
USB2.0
DP/DM
USB 2.0
PM/PMI GPIOs
PM/PMI GPIOx7 (incl. 2xPWM)
INTx3
switch
SPI/INT
I2C/INT
SPI/I2C/INT
Opt. external clk clock GPIO
PWR/RST
PWR/RST
PM GPIOs x 2 PM GPIOs
High speed expansion 2High speed expansion 1
Low speed expansion 1
5V TPS54428
TPS54428
TPS54428 x2
SYS DC_IN (12V)
SYS DC_IN (12V)
SYS DC_IN (12V)
SYS DC_IN (12V)
TurboX D845 SOM
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The DragonBoard 845c uses a package on package (PoP) LPDDR4X RAM configuration and discrete UFS2.1 flash
memory.
●The LPDDR4X interface directly to the Snapdragon 845 built-in LPDDR controller. The maximum DDR clock is
1866 Mhz.
●The UFS flash memory interfaces with Snapdragon 845 over a dedicated UFS PHY bus supporting the UFS 2.1
specification.
4.4 MicroSD
The DragonBoard 845c SD slot (⑭) signals are routed directly to the Snapdragon 845 SDC2 interface. The slot is
a push-push type with a dedicated support for card detect signal (many SD slots do not have a dedicated CD pins,
they use DATA3 state as the card detected signal). The DragonBoard 845c board uses SDA GPIO_126 as the
SD_CARD_DET_N.
4.5 WiFi/BT RF
The DragonBoard 845c uses Qualcomm RF chip WCN3990 solution that integrates two wireless connectivity
technologies into a single device. The interfaces are:
●WLAN compliant with IEEE 802.11 b/g/n/ac specifications, exceeding 96Boards minimal requirements for WiFi.
●Bluetooth compliant with the BT specifications version 5.0 (BR/EDT + BLE), meeting the 96Boards requirements
for BT.
The DragonBoard 845c onboard antenna(㉒) are connected to SOM antenna socket with RF coaxial cable. The SOM
antenna sockets adopts the MIMO type, the socket(㉓) combines BT and WIFI chain0; the socket(㉔) only supports
WIFI chain1.
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4.6 Display Interface
5xSPDT
(Diff)
DSI TO HDMI
(LT9611)
High Speed Exp CONN1
I2S(4bit)
I2C
GPIO_84
DSI1 4LANE
DSI0 4LANE
GPIO_120
1
0
Dip SW
HDMI
(TMDS+DDC)
HPD
HDMI Type A
INT
4.6.1 HDMI
The Snapdragon 845 doesn’t include a built-in HDMI interface. The DragonBoard 845c deploys the built-in MIPI-
DSI 2x4 lanes interface as the source for the HDMI output. A peripheral DSI to HDMI Bridge (LONTIUM
SEMICONDUCTOR LT9611) performs this task and it supports a resolution from 1080p to 4K at 30Hz.
While the LT9611 supports automatic input video format timing detection (D-PHY1.2,DSI1.3/CSI-2 1.00 and DCS
1.02.00), an I2C channel from the Snapdragon 845 allows the user to configure the operation of this bridge. It is
QUP10 I2C interface from the SoC that connects to the bridge.
This bridge supports audio as well (meeting the 96Boards requirements to provide audio via HDMI). The
DragonBoard uses a 4 bit I2S2 interface from the Snapdragon 845 for this task.
Please note that the 96Boards specification calls for a MIPI-DSI interface to be routed to the High-Speed Expansion
connector. Since the Snapdragon 845 has two MIPI-DSI interfaces for HDMI. A muxing device (FSA644UCX) is
being use on the board. Only one interface, HDMI, or the Expansion MIPI-DSI can be active at a given time. The
controlling signal is named ‘GPIO120_DSI_SW_SEL’. When this signal is logic high, ‘1’, the MIPI-DSI is routed
to the DSI-HDMI Bridge. When ‘GPIO120_DSI_SW_SEL’ is logic level low, ‘0’, the MIPI-DSI is routed to the
High Speed Expansion connector. This design assigned the ‘GPIO120_DSI_SW_SEL’ function to GPIO_120.
User can overwrite the software control by sliding switch 4 of Dip Switch to the ‘ON’ position. That action forces
the DSI mux to route the MIPI-DSI to the High Speed Expansion connector. The overwrite option exist for the High-
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Speed Expansion only, you cannot software overwrite the mux to DSI-HDMI Bridge.
4.6.2 MIPI-DSI
The DragonBoard 845c implemented a four-lane MIPI_DSI interface meeting this requirement. More information
about this implementation can be found in chapter 6 “High speed expansion connector”.
4.7 Camera Interfaces
The DragonBoard 845c implements four camera interfaces.
● 4 lane CSI0 camera on primary high speed connector ⑥(J2000).
● 4 lane CSI1camera on secondary high speed connector ⑫ (J2001).
● 4 lane CSI2 camera on secondary high speed connector ⑫ (J2001).
● 2 lane CSI3 camera on primary high speed connector ⑥(J2000).
More information about this implementation can be found in chapter 6 “High speed expansion connector”.
4.8 USB Ports
PCIe->USB
Type A
(USB SS+HS)
Type A
(USB SS+HS)
Type C
(USB SS+HS)
PCIe0
USB hs
USB hs
USB SS
SDA845
USB1
USB2
5V Buck
VBUS
VBUS
PMI8998
VBUS
CC1/CC2
USB2
USB1
USB4
High Speed Exp CONN HS2
High Speed Exp CONN HS1
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4.8.1 USB-Host ports
The Snapdragon 845 includes two USB channel: USB1(⑤) is for Type C port, the other USB2 (③)is for normal
host port. The DragonBoard 845c supports 3 USB Host ports as follows:
Port 1 of the SoC USB2(③), a Type ‘A’ USB Host 3.0 (Super speed) connector. A current limited sets the Power
Current limit to 1.0A.
Port 2 of the USB HUB (①), a Type ‘A’ USB Host 3.0 (Super speed) connector. A current limited sets the Power
Current limit to 1.0A.
Port 3 of the USB HUB is routed to the High Speed Expansion connectors (Super speed to ⑥, High speed to ⑫).
No current limited controller is implemented on the board for this channel.
Another USB HUB port is routed to the High Speed Expansion connectors ⑥ (High speed). No current limited
controller is implemented on the board for this channel.
4.8.2 USB-Device port
The DragonBoard 845c implements a USB device port. The port is located at ⑤, a Type C connector.
The Type C supports the device or host with different peripheral, the Snapdragon 845 do the configure based on Type
C rules. The board can work in one mode at a time, Host mode or Device mode, not both.
Note: There is a micro-B USB port ㉑, it is only for debug log output which is from Snapdragon 845 debug UART
to USB transformation.
4.9 Audio
The 96Boards specifications calls for a minimum of single channel audio through two interfaces, BT and
HDMI/MHL/DisplayPort.
The DragonBoard 845c meets this requirement with HDMI support, Display Port, and has additional audio channels,
including support for headset jack. More information about these additional channels can be found in sections 5.
Note that MHL is not supported.
4.9.1 BT Audio
The BT 5.0 implementation on the DragonBoard 845c is via a MAC in the SDA845 and an external modem,
WCN3990. The UART and IQ interface between the SoC and the modem carriers all communication including audio.
4.9.2 HDMI Audio
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A 4-bit (audio out only) I2S channel is routed directly from the Snapdragon 845 SoC I2S interface pins to the DSI-
HDMI bridge.
4.9.3 DisplayPort Audio
The DisplayPort audio is routed directly from the Snapdragon 845 SoC EDP interface pins to Type C USB connector.
4.10 DC-power and Battery Power
The DragonBoard 845c supports power to be provided to the board in one of the following ways:
• An 8V to 18V power from a dedicated DC jack
• An 8V to 18V power from the SYS_DCIN pins on the Low Speed Expansion Connector
• A USB Type C port at 5V
Please see section 7 for detailed information on 845c implementation of DC Power.
4.11 Measurements
The 96Boards specification calls for support for measuring power consumptions of the board.
Please see section 7 for detailed information on DragonBoard 845c power measurement implementation.
4.12 Buttons
The 96Boards specification calls for the present of two buttons, a Power on/sleep button and a Reset button.
The DragonBoard 845c meets these requirements. Please see section 8 for detailed information on the buttons of the
DragonBoard 845c.
4.13 External Fan connection
The 96Boards specification calls for support for an external fan. That can be achieved by using the 5V or the DC IN.
Both present on the Low Speed Expansion connector.
4.14 UART
The DragonBoard 845c supports for one SoC UART and an optional second UART both to be routed to the Low
Speed Expansion Connector.
One UART is directly from SoC pins to Low Speed Expansion Connector; the other option one is for the UART
debug log port, if the user wants to use the port for log output, it needs to switch the dip switch pin 2 to "OFF" state.
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4.15 System and user LEDs
The DragonBoard 845c supports six LEDs to be implemented on the board. The specification defines the LEDs color
and mechanical location on the board.
Two activity LEDs:
• WiFi activity LED – 845c drives this Yellow LED via GPIO9 from the PMIC(PM845).
• BT activity LED – 845c drives this Blue LED via GPIO5 from the PMIC(PM845).
Four User LEDs:
The four user LEDs are surface mount Green in 0603 size located next to the two USB type A connector and labeled
‘USER LEDS 3 2 1 0’. The 845c drives three LEDs from the red, green and blue LED drive from power management
IC PMI8998. The fourth User LEDs is driven by the PM845 via GPIO13.
Power indicator LED:
A green LED is included to indicate the presence of input power to the DragonBoard 845c .
4.16 Expansion Connector
The 96Boards specification calls for two Expansion Connectors, a Low Speed and a High Speed.
The DragonBoard 845c meets this requirement, please review section 5 for detailed information regarding the Low
Speed Expansion Connector and section 6 for detailed information regarding the High Speed Expansion Connectors.
4.17 Additional Functionality
The 96Boards specifications allows for additional functionality provided that all mandatory functionality is available
and there is no impact on the physical footprint specifications including height and do not prevent the use of the
96Boards CE low speed and high speed expansion facilities.
The DragonBoard 845c board implements a few additional functions, which are listed in the following sub-chapters.
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4.17.1 Ethernet Connector
USB->Ethernet Ctr
PCIe0
SDA845
USB3
PCIe->USB
RJ45
Gigabit Ethernet is not supported by the Snapdragon 845 SoC, the DragonBoard 845c board has the translation from
PCIe0 to USB and then USB to Gigabit Ethernet controller, it uses an RJ45⑧ as the physical interface.
4.17.2 Inertial Sensors
The DragonBoard 845c includes the following inertial sensors
● 6-axis Accelerometer/Gyroscope: INVENSENSE ICM-42688
●LIGHT SENSOR AND PROXIMITY SENSOR: LITEON LTR-553ALS-WA
4.17.3 Dip Switch
There is a dip switch ⑮ on the DragonBoard 845c.
Switch 1: NA;
Switch 2: 'ONBOARD_DEBUG_UART_EN_N', when set to 'ON' position, will force the debug UART log to micro
USB port; when set to 'OFF', will force the debug UART log to Low Speed Expansion Connector.
Switch 3:' CBL_PWR_N ', when set to 'ON' position, SDA845 system will power on automatically; when set to 'OFF',
SDA845 system will power on by ON-KEY manually.
Switch 4:' SW_DSI1_TO_LT9611_N ', when set to 'ON' position, the SDA845 DSI1 will force to High Speed
Expansion Connector; when set to 'OFF', the DSI1will force to LT9611 DSI->HDMI bridge.
Switch 5:' SENSOR_DISCONNECT ', when set to 'ON' position, the SDA845 SSC sensor SPI/I2C will force to Low
Speed Expansion Connector; when set to 'OFF', the SSC sensor SPI/I2C will force to onboard sensor.
Switch 6:' IMU_EXT_CLK_TOGGLE ', when set to 'ON' position, the onboard ICM-42688 sensor will use the
external clk of GPIO78 from SoC; when set to 'OFF', the onboard ICM-42688 sensor will use another interrupt output
to SoC GPIO118. These GPIOs needs the software configure setting.
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4.17.4 Extra High Speed Expansion Connector
The DragonBoard 845c has another High Speed Expansion Connector. Detail information is provided in section 6.
4.17.5 Extra Low Speed Expansion Connectors
The DragonBoard 845c has another two Low Speed Expansion Connectors. Detail information is provided in section
5.
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5 Low speed Expansion connector
5.1 Primary Low Speed Expansion Connector: LS1 ⑩
PIN
96 Boards Signals
845c Signal
Note
1
GND
GND
3
UART0_CTS
GPIO41_UART0_CTS
5
UART0_TxD
GPIO43_UART0_TXD
7
UART0_RxD
GPIO44_UART0_RXD
9
UART0_RTS
GPIO42_UART0_RTS
11
UART1_TxD
GPIO4_DEBUG_UART_TX_LS1
13
UART1_RxD
GPIO5_DEBUG_UART_RX_LS1
15
I2C0_SCL
GPIO34_I2C0_SCL
17
I2C0_SDA
GPIO33_I2C0_SDA
19
I2C1_SCL
GPIO32_I2C1_SCL
21
I2C1_SDA
GPIO31_I2C1_SDA
23
GPIO-A
GPIO49_QUP12
25
GPIO-C
GPIO50_QUP12
27
GPIO-E
GPIO51_QUP12
29
GPIO-G
GPIO10
31
GPIO-I
GPIO9_CAM0_RST_N
33
GPIO-K
GPIO8_CAM1_RST_N
35
+1V8
VREG_S4A_1P8
37
+5V
VDC_5V
39
GND
GND
PIN
96 Boards Signals
845c Signal
Note
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2
GND
GND
4
PWR_BTN_N
PHONE_ON_N
6
RST_BTN_N
PM_RESIN_N
Default volume down;
8
SPI0_SCLK
GPIO29_SPI0_SCLK
10
SPI0_DIN
GPIO27_SPI0_MISO
12
SPI0_CS
GPIO30_SPI0_CS
14
SPI0_DOUT
GPIO28_SPI0_MOSI
16
PCM_FS
GPIO81_PCM_FS
18
PCM_CLK
GPIO80_PCM_CLK
20
PCM_DO
GPIO83_PCM_DO
22
PCM_DI
GPIO82_PCM_DI
24
GPIO-B
GPIO79_MI2S1_MCLK
26
GPIO-D
GPIO52_QUP12
28
GPIO-F
GPIO7_I2C_SCL
30
GPIO-H
GPIO6_I2C_SDA
33
GPIO-J
GPIO26_CAM0_VSYNC_OUT
34
GPIO-L
GPIO40_CAM1_AFE_GPO
36
SYS_DCIN
DC12V
38
SYC_DCIN
DC12V
40
GND
GND
5.1.1 UART {0/1}
The 96Boards specifications calls for a 4-wire UART implementation, UART0 and an optimal second 2-wire UART,
UART1 on the Low Speed Expansion Connector.
The DragonBoard 845c implements UART0 as a 4-wire UART that connects directly to the SDA845 SoC. These
signals are driven at 1.8V.
The DragonBoard 845c implements UART1 as a 2-wire UART that connects directly to the Snapdragon 845 SoC.
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These signals are driven at 1.8V.
5.1.2 I2C {0/1}
The 96Boards specification calls for two I2C interfaces to be implemented on the Low Speed Expansion Connector.
The DragonBoard 845c implements both interfaces, I2C0 and I2C1 that connects directly to the Snapdragon 845
SoC. A resistor is needed to provide as pull-up for each of the I2C lines per the I2C specifications for further, these
pull-ups need to be connected to the 1.8V voltage rail.
5.1.3 GPIO {A-L}
The 96Boards specifications calls for 12 GPIO lines to be implemented on the Low Speed Expansion Connector.
The DragonBoard 845c implements this requirement. 12 GPIOs are routed from the Snapdragon 845 SoC. The
GPIOs are 1.8V voltage rail.
• GPIO A - Connects to GPIO_49 of SDA845 SoC, Can be configured to be an IRQ line.
• GPIO B - Connects to GPIO_79 of SDA845 SoC. Can be configured to be an IRQ line, and SEC_MI2S_MCLK
• GPIO C - Connects to GPIO_50 of SDA845 SoC.
• GPIO D - Connects to GPIO_52 of SDA845 SoC. Can be configured to be an IRQ line
• GPIO E - Connects to GPIO_51 of SDA845 SoC.
• GPIO F - Connects to GPIO_7 of SDA845 SoC. Can be configured to be I2C SCL.
• GPIO G - Connects to GPIO_10 of SDA845 SoC. Can be configured to be IRQ line.
• GPIO H - Connects to GPIO_6 of SDA845 SoC. Can be configured to be I2C SDA.
• GPIO I - Connects to GPIO_9 of SDA845 SoC. Can be configured to be a CAM0_RST signal.
• GPIO J - Connects to GPIO_26 of SDA845 SoC. Can be configured to be IRQ line and CAM0_VSYNC_OUT.
• GPIO K - Connects to GPIO_8 of SDA845 SoC. Can be configured to be a CAM1_RST signal.
• GPIO L - Connects to GPIO_40 of SDA845 SoC. Can be configured to be IRQ line and CAM1_AFE_GPO
signal.
The IRQ lines create a wake-up event for the SoC.
5.1.4 SPI
The 96Boards specification calls for one SPI bus master to be provided on the Low Speed Expansion Connector.
The DragonBoard 845C implements a full SPI master with 4 wires, CLK, CS, MOSI and MISO all connect directly
to the SDA845 SoC. These signals are driven at 1.8V.
5.1.5 PCM/I2S
The 96Boards specification calls for one PCM/I2S bus to be provided on the Low Speed Expansion Connector. The
CLK, FS and DO signals are required while the DI is optional.
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The DragonBoard 845c implements a PCM/I2S with 4 wires, CLK, FS, D0 and DI. The I2S signals are connected
directly to the SDA845 SoC. These signals are driven at 1.8V.
5.1.6 Power and Reset
The 96Boards specification calls for a signal on the Low Speed Expansion Connector that can power on/off the board
and a signal that serves as a board reset signal.
The DragonBoard 845c routes the PWR_BTN_N (named PHONE_ON_N on 845c schematic) signal to the
KYP_DPWR_N pin of the PM845 PMIC. This signal is driven by SW1301 as well, the on-board power on push-
button switch(⑳). Please note that the push button only provides an On/Sleep function and not OFF functionality.
A mezzanine implementation of this signals should not drive it with any voltage, the only allowed operation is to
force it to GND to start the board from a sleep mode. A board shutdown will occur when this signal is held to ground
for more than 15 seconds.
The DragonBoard 845c board routes the RST_BTN_N (named PM_RESIN_N on DragonBoard 845c schematic)
signal to the RESIN_N pin of the PM845 PMIC. This signal is driven by SW1302, the on-board reset switch(⑰).
This signal is a dual purpose, the default purpose is Volume Down, the other purpose is the Reset function that needs
the software configure setting.
5.1.7 Power Supplies
The 96Boards specification calls for three power rails to be present on the Low Speed Expansion Connector:
● +1.8V : Max of 100mA
● +5V : Able to provide a minimum of 5W of power (1A).
● SYS_DCIN : 9-18V input with enough current to support all the board functions or the output DCIN from
on-board DC Connector able to provide a minimum of 7W of power.
The DragonBoard 845c supports these requirements as follows:
+1.8V : Driven by PMIC PM845 VREG_S4A_1P8, which can provide 100mA.
+5V : Driven by the 4A 5.0V DC to DC converter (U0801). This buck switcher powers HDMI and CAN current
devices. The remaining capacity provides a max current of 2A to the Low Speed Expansion Connector to meets the
96Boards requirements.
SYS_DCIN: DC jack input can serve as the board’s main power source.
5.2 Secondary Low Speed Connector:LS2 ⑩
PIN
845c Signal
Connect to
Note
1
DMIC_CLK1_OR_AMIC1_P
WCD9340
3
DMIC_DATA1_OR_AMIC1_M
WCD9340
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5
MIC_BIAS1
WCD9340
7
DMIC_CLK2_OR_AMIC3_P
WCD9340
9
DMIC_DATA2_OR_AMIC3_M
WCD9340
11
MIC_BIAS3
WCD9340
13
DMIC_CLK3_OR_HPH_MIC_P
WCD9340
15
DMIC_DATA3_OR_HPH_MIC_M
WCD9340
17
MIC_BIAS4_OR_HS_MIC_BIAS2
WCD9340
19
WCD_HPH_R
WCD9340
21
WCD_HPH_REF
WCD9340
23
WCD_HPH_L
WCD9340
25
WSA0_SPKR_OUT_P
WSA8810
27
WSA0_SPKR_OUT_M
WSA8810
29
WSA1_SPKR_OUT_P
WSA8810
31
WSA1_SPKR_OUT_M
WSA8810
33
WCD_HSDET_L
WCD9340
35
PM_GPIO13_GREEN_U4_LED
PM845
37
VBAT
A board DC buck power 4.2V
39
GND
PIN
845c Signal
Connect to
Note
2
LS2_CAN_H
MCP2561
4
LS2_CAN_L
MCP2561
6
VREG_LVS1A_1P8
PM845
8
GND
10
PMI_GPIO5
PMI8998
12
PMI_GPIO8
PMI8998
14
GPIO85_QUP5
SDA845
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16
GPIO86_QUP5
SDA845
18
GPIO87_QUP5
SDA845
20
GPIO88_QUP5
SDA845
22
GPIO76_MI2S2_WS
SDA845
24
GPIO75_MI2S2_SCK
SDA845
26
GPIO77_MI2S2_DATA0
SDA845
28
GPIO78_MI2S2_DATA1
SDA845
30
PM_GPIO21
PM845
33
PM_GPIO8
PM845
34
PM_GPIO9_YEL_WIFI_LED
PM845
36
PM_GPIO5_BLUE_BT_LED
PM845
38
USB_VBUS
PMI8998
40
GND
5.2.1 Headset
The headset signals are routed from the WCD9340 codec, one signal is routed from the connector to the CODEC,
the signals are:
●WCD_HPH_R - Headphone PA right channel output
●WCD_HPH_L - Headphone PA left channel output
●WCD_HPH_REF - Headphone PA ground sensing
●WCD_HSDET_L- Headset detection
5.2.2 Stereo speaker
The speaker signals are routed from the Stereo WSA8810; the signals are:
●WSA0_SPKR_OUT_P - Class-D speaker amplifier output+
●WSA0_SPKR_OUT_M - Class-D speaker amplifier output-
●WSA1_SPKR_OUT_P - Class-D speaker amplifier output+
●WSA1_SPKR_OUT_M - Class-D speaker amplifier output+
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5.2.3 Digital Microphones
The expansion connector supports 3 additional default digital microphone inputs:
●DMIC_1 or AMIC_1
●DMIC_2 or AMIC_2
●DMIC_3 or HPH_MIC: Headset MIC
●MIC_BIAS1
●MIC_BIAS3
●MIC_BIAS4_OR_HS_MIC_BIAS2: Reference micbias4 or headset microphone bias
The analog microphone can be configured by changing the WCD codec audio share resistors. The HPH MIC is for
headset microphone input.
5.2.4 CAN
Low Speed
Expansion
Connector
SDA845 CAN Controller CAN Transceiver
QUP0 SPI
TX
RX
CAN_H
CAN_L
The CAN signals are routed from CAN transceiver which is from SPI translation. The signals are:
●LS2_CAN_H: CAN High-Level Voltage I/O
●LS2_CAN_L: CAN Low-Level Voltage I/O
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5.2.5 I2S
The DragonBoard 845c board implements another PCM/I2S with 4 wires, CLK, FS, D0 and DI. The I2S signals are
connected directly to the SDA845 SoC. These signals are driven at 1.8V. The signals are:
●GPIO76_MI2S2_WS :TER_MI2S_WS
●GPIO75_MI2S2_SCK : TER_MI2S_SCK
●GPIO77_MI2S2_DATA0 : TER_MI2S_DATA0
●GPIO78_MI2S2_DATA1 : TER_MI2S_DATA1
5.2.6 GPIOs
The DragonBoard 845c board implements more GPIOs for Low Speed Expansion Connector. The GPIOs are 1.8V
voltage rail.
• GPIO85_QUP5 - Connects to GPIO_85 of SDA845 SoC QUP5, Can be configured to be an IRQ line.
• GPIO86_QUP5- Connects to GPIO_86 of SDA845 SoC QUP5. Can be configured to be an IRQ line,
• GPIO87_QUP5 - Connects to GPIO_87 of SDA845 SoC QUP5.
• GPIO88_QUP5 - Connects to GPIO_88 of SDA845 SoC QUP5. Can be configured to be an IRQ line
• PMI_GPIO5 - Connects to GPIO_5 of PMI8998 PMIC. Can be configured to be a PWM
• PMI_GPIO8 - Connects to GPIO_8 of PMI8998 PMIC. Can be configured to be a PWM.
• PM_GPIO21 - Connects to GPIO_21 of PM845 PMIC. Can be configured to be ADC.
• PM_GPIO8 - Connects to GPIO_8 of PM845 PMIC. Can be configured to be ADC.
• PM_GPIO5_BLUE_BT_LED - Connects to GPIO_5 of PM845 PMIC. Can be configured to be Bluetooth LED
enable.
• PM_GPIO9_YEL_WIFI_LED - Connects to GPIO_9 of PM845 PMIC. Can be configured to be WIFI LED enable.
• PM_GPIO13_GREEN_U4_LED - Connects to GPIO_13 of PM845 PMIC. Can be configured to be USER4 LED
enable.
The IRQ lines create a wake-up event for the SoC.
5.2.7 Other signals on Secondary Low Speed Connector
The DragonBoard 845c implements more source voltage at the Lowe Speed Expansion Connector. The signals are:
• USB_VBUS : Connects to VBUS of PMI8998 PMIC, Can be configured to be an OTG USB VBUS.
• VBAT : Connects to a DC-DC buck of board power, be configured to output 4.2V source.
• VREG_LVS1A_1P8 : Connects to a SOM PMIC PM845 LVS1A LDO, be configured to output 1.8V source.
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5.3 Tertiary Low Speed Connector:LS3 ⑪
PIN
845c Signal
Connect to
Note
1
SSC4_SPI_CLK
SDA845
3
SSC3_SPI_MOSI
SDA845
5
SSC2_SPI_MISO
SDA845
7
SSC7_SPI_ACCEL_CS
SDA845
9
SSC6_SPI_GYRO_CS
SDA845
11
SSC5_SPI_MAG_CS
SDA845
13
VREG_LVS2A_1P8
PM845
15
VDC_5V
A board DC buck power 5V
17
VBAT
A board DC buck power 4.2V
19
GND
PIN
845c Signal
Connect to
Note
2
GPIO124_PS_INT
SDA845
4
GPIO117_ACCEL_INT
SDA845
6
GPIO118_GYRO_INT
SDA845
8
GPIO123_MAG_INT
SDA845
10
GPIO119_MAG_DRDY_INT
SDA845
12
SSC0_I2C_SDA
SDA845
14
SSC1_I2C_SCL
SDA845
16
VREG_S4A_1P8
PM845
18
GND
20
GND
5.3.1 SSC SPI
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The DragonBoard 845c implements a SSC SPI interface for different sensors that connect to Snapdragon 845
processor sensor core. The SPI can support 3 CS signals. The signals are:
• SSC4_SPI_CLK : Connects to SSC4 of SDA845 SoC, Be configured to CLK.
• SSC3_SPI_MOSI : Connects to SSC3 of SDA845 SoC. Be configured to MOSI.
• SSC2_SPI_MISO : Connects to SSC2 of SDA845 SoC. Be configured to MISO.
• SSC7_SPI_ACCEL_CS : Connects to SSC7 of SDA845 SoC. Be configured to Accelerometer CS.
• SSC6_SPI_GYRO_CS : Connects to SSC6 of SDA845 SoC. Be configured to Gyroscope CS.
• SSC5_SPI_MAG_CS : Connects to SSC5 of SDA845 SoC. Be configured to Magnetometer CS.
The dip switch(⑮) pin5 is the different configure setting for onboard 6-axis sensor ICM-42688 or other expansion.
If the SPI for other expansion, dip switch pin5 needs to be removed from “OFF” to “ON”.
5.3.2 SSC I2C
The DragonBoard 845c implements a SSC I2C interface for different sensors that connect to Snapdragon 845
processor sensor core. A 2.2k resistor is neededto provide as pull-up for each of the I2C lines per the I2C
specifications, these pull-ups need to connected to the 1.8V voltage rail. The signals are:
• SSC0_I2C_SDA : Connects to SSC0 of SDA845 SoC, Be configured to I2C SDA.
• SSC1_I2C_SCL : Connects to SSC1 of SDA845 SoC. Be configured to I2C SCL.
The dip switch(⑮) pin5 is the different configure setting for onboard I2C sensor LTR-553ALS-WA or other
expansion. If the I2C for other expansion, dip switch pin5 needs to be removed from “OFF” to “ON”.
5.3.3 Sensor interrupt
The DragonBoard 845c implements a SSC interrupt for sensor interrupts that is the 1.8V voltage rail. The signals are:
• GPIO117_ACCEL_INT : Connects to GPIO_117 of SDA845 SoC, Be configured to Accelerometer INT.
• GPIO118_GYRO_INT : Connects to GPIO_118 of SDA845 SoC, Be configured to Gyroscope INT.
•GPIO119_MAG_DRDY_INT : Connects to GPIO_119 of SDA845 SoC, Be configured to Magnetometer data
INT.
• GPIO123_MAG_INT : Connects to GPIO_123 of SDA845 SoC, Be configured to Magnetometer INT.
• GPIO124_PS_INT : Connects to GPIO_124 of SDA845 SoC, Be configured to Proximity INT.
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5.3.4 Other signals on Tertiary Low Speed Connector
The DragonBoard 845c implements more source voltage at the Lowe Speed Expansion Connector. The signals are:
• VREG_LVS2A_1P8 : Connects to LVS2 LDO of PM845 PMIC, Can be as sensor IO voltage source.
• VDC_5V : Connects to a board DC buck power 5V, Can be as a 5V voltage source.
•VBAT : Connects to a board DC buck power 4.2V, Can be as a 4.2V voltage source.
• VREG_S4A_1P8 : Connects to S4A LDO of PM845 PMIC, Can be as a 1.8V voltage and 100mA source.
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6 High speed expansion connectors
6.1 Primary High Speed expansion connector: HS1 ⑥
The following table shows the High Speed Expansion Connector pin out:
PIN
96Boards Signals
845c Signals
Note
1
SD_DAT0/SPI1_DOUT
SDC4_DATA0
3
SD_DAT1
SDC4_DATA1
5
SD_DAT2
SDC4_DATA2
7
SD_DAT3/SPI1_CS
SDC4_DATA3
9
SD_SCLK/SPI1_SCLK
SDC4_CLK
11
SD_CMD/SPI1_DIN
SDC4_CMD
13
GND
GND
15
CLK0/CSI0_MCLK
CAM0_MCLK
17
CLK1/CSI1_MCLK
CAM3_MCLK
19
GND
GND
21
DSI_CLK+
MIPI_DSI1_CLK_P
23
DSI_CLK-
MIPI_DSI1_CLK_N
25
GND
GND
27
DSI_D0+
MIPI_DSI1_LANE0_P
29
DSI_D0-
MIPI_DSI1_LANE0_N
31
GND
GND
33
DSI_D1+
MIPI_DSI1_LANE1_P
35
DSI_D1-
MIPI_DSI1_LANE1_N
37
GND
GND
39
DSI_D2+
MIPI_DSI1_LANE2_P
41
DSI_D2-
MIPI_DSI1_LANE2_N
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43
GND
GND
45
DSI_D3+
MIPI_DSI1_LANE3_P
47
DSI_D3-
MIPI_DSI1_LANE3_N
49
GND
GND
51
USB_D+
PCIE0_USB4_HS_DP
PCIe USB HUB port 4.
53
USB_D-
PCIE0_USB4_HS_DM
55
GND
GND
57
HSIC_STR
PCIE0_USB5_HS_DP
No HSIC implementation; configured as
USB 2.0 expansion. PCIe USB port 2.
59
HSIC_DATA
PCIE0_USB5_HS_DM
PIN
96Boards Signals
845c Signals
Note
2
CSI0_C+
MIPI_CSI0_CLK_P
4
CSI0_C-
MIPI_CSI0_CLK_N
6
GND
GND
8
CSI0_D0+
MIPI_CSI0_LANE0_P
10
CSI0_D0-
MIPI_CSI0_LANE0_N
12
GND
GND
14
CSI0_D1+
MIPI_CSI0_LANE1_P
16
CSI0_D1-
MIPI_CSI0_LANE1_N
18
GND
GND
20
CSI0_D2+
MIPI_CSI0_LANE2_P
22
CSI0_D2-
MIPI_CSI0_LANE2_N
24
GND
GND
26
CSI0_D3+
MIPI_CSI0_LANE3_P
28
CSI0_D3-
MIPI_CSI0_LANE3_N
30
GND
GND
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32
I2C2_SCL
CCI_I2C_SDA0
34
I2C2_SCL
CCI_I2C_SCL0
36
I2C3_SDA
CCI_I2C_SDA1
38
I2C3_SDA
CCI_I2C_SCL1
40
GND
GND
42
CSI1_D0+
MIPI_CSI3_LANE0_P
44
CSI1_D0-
MIPI_CSI3_LANE0_N
46
GND
GND
48
CSI1_D1+
MIPI_CSI3_LANE1_P
50
CSI1_D1-
MIPI_CSI3_LANE1_N
52
GND
GND
54
CSI1_C+
MIPI_CSI3_CLK_P
56
CSI1_C-
MIPI_CSI3_CLK_N
58
GND
GND
60
RESERVED
VREG_S4A_1P8
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6.1.1 MIPI DSI 0
5xSPDT
(Diff)
DSI TO HDMI
(LT9611)
High Speed Exp CONN1
SDA845
I2S(4bit)
I2C
GPIO_84
DSI1 4LANE
DSI0 4LANE
GPIO_120
1
0
Dip SW
HDMI
(TMDS+DDC)
HPD
HDMI Type A
INT
The 96Boards specification calls for a MIPI-DSI to be present on the High Speed Expansion Connector. A
minimum of one lane is required and up to four lanes can be accommodated on the connector.
The DragonBoard 845c implementation supports a full four lane MIPI-DSI interface that is routed to the Primary
High Speed Expansion Connector. Since the SDA845 has no HDMI interface, and it is used to drive the DSI-HDMI
Bridge, DSI muxing is required. A muxing device (FSA644UCX) is being use on the board. Only one interface,
HDMI, or the Expansion MIPI-DSI can be active at a given time. The signal is named ‘GPIO120_DSI_SW_SEL’.
When this signal is logic high, ‘1’, the MIPI-DSI is routed to the DSI-HDMI Bridge. When
‘GPIO120_DSI_SW_SEL’ is logic level low, ‘0’, the MIPI-DSI is routed to the High Speed Expansion connector.
This design assigned the ‘GPIO120_DSI_SW_SEL’ function to GPIO_120.
User can overwrite the software control by sliding switch 4 of Dip Switch to the ‘ON’ position. That action forces
the DSI mux to route the MIPI-DSI to the High Speed Expansion connector. The overwrite option exist for the High
Speed Expansion only, you cannot software overwrite the mux to DSI-HDMI Bridge.
6.1.2 MIPI CSI {0/1}
The 96Boards specification calls for two MIPI-CSI interfaces to be present on the High Speed Expansion Connector.
Both interfaces are optional. CSI0 interface can be up to four lanes while CSI1 is up to two lanes.
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The current DragonBoard 845c implementation supports a full four lane MIPI-CSI interface on CSI0 and two lanes
of MIPI-CSI on CSI3. All MIPI-CSI signals are routed directly to/from the SDA845.
6.1.3 I2C {2/3}
The 96Boards specification calls for two I2C interfaces to be present on the High Speed Expansion Connector. Both
interfaces are optional unless a MIPI-CSI interface has been implemented. Then an I2C interface shall be
implemented.
The current DragonBoard 845c implementation supports two MIPI-CSI interfaces and therefore must support two
I2C interfaces. For MIPI-CSI0 the companion I2C2 is routed directly from the SDA845. For MIPI-CSI3, the
companion I2C is I2C3.
Note: Both interfaces, I2C2 and I2C3 have an on-board 2.2K pull-up resistors pulled-up to the 1.8V voltage rail.
6.1.4 HSIC
The 96Boards specification calls for an optional MIPI-HSIC interface to be present on the High Speed Expansion
Connector.
The DragonBoard 845c implementation doesn’t support this optional requirement.
6.1.5 Reserved
The 96Boards specification calls for a 10K pull-up to 1.8V to be connected to pin 60 of the High Speed Expansion
Connector.
The DragonBoard 845c utilizes a 100K pull-up on pin 60.
6.1.6 SD/SPI
The 96Boards specification calls for an SD interface or a SPI port to be part of the High Speed Expansion Connector.
The DragonBoard 845c implements a full SD master with SDIO (CLK/CMD/D0~D3) directly to the SDA845 SoC.
These signals are driven at 1.8V.
6.1.7 Clocks
The 96Boards specification calls for one or two programmable clock interfaces to be provided on the High Speed
Expansion Connector. These clocks may have a secondary function of being CSI0_MCLK and CSI1_MCLK. If these
clocks can’t be supported by the SoC than an alternative GPIO or No-Connect is allowed by the specifications.
The DragonBoard 845c implements two CSI clocks, CAM0_MCLK via SDA GPIO_13 for CSI0 and CAM3_MCLK
via SDA GPIO_16 for CSI3. These signals are driven at 1.8V.
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6.1.8 USB
The 96Boards specification calls for a USB Data line interface to be present on the High Speed Expansion
Connector.
The DragonBoard 845c implements this requirement by routing USB channel 2/4 from the PCIe USB HUB to the
High Speed Expansion Connector.
6.2 Secondary High Speed Connector: HS2⑫
PIN
845c Signals
Connect to
Note
1
PCIE1_REFCLK_M
SDA845
3
PCIE1_REFCLK_P
SDA845
4
PCIE1_RX_M
SDA845
7
PCIE1_RX_P
SDA845
9
PCIE1_TX_M
SDA845
11
PCIE1_TX_P
SDA845
13
GPIO102_PCIE1_RST_N
SDA845
Configured for PCIe1
RST
15
GPIO103_PCIE1_CLK_REQ
SDA845
Configured for PCIe1
CLK REQ
17
GPIO11_PCIE1_WAKE_N
SDA845
Configured for PCIe1
WAKE
19
GPIO12_CAM2_RST_N
SDA845
21
GPIO21_CAM3_RST_N
SDA845
23
GPIO116_CAM3_VSYNC_OUT
SDA845
25
GND
27
CAM1_MCLK
SDA845
29
CAM2_MCLK
SDA845
31
GND
33
MIPI_CSI2_CLK_P
SDA845
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35
MIPI_CSI2_CLK_N
SDA845
37
GND
39
MIPI_CSI2_LANE0_P
SDA845
41
MIPI_CSI2_LANE0_N
SDA845
43
GND
45
MIPI_CSI2_LANE1_P
SDA845
47
MIPI_CSI2_LANE1_N
SDA845
49
GND
51
MIPI_CSI2_LANE2_P
SDA845
53
MIPI_CSI2_LANE2_N
SDA845
55
GND
57
MIPI_CSI2_LANE3_P
SDA845
59
MIPI_CSI2_LANE3_N
SDA845
PIN
845c Signals
Connect to
Note
2
MIPI_CSI1_CLK_P
SDA845
4
MIPI_CSI1_CLK_N
SDA845
6
GND
8
MIPI_CSI1_LANE0_P
SDA845
10
MIPI_CSI1_LANE0_N
SDA845
12
GND
14
MIPI_CSI1_LANE1_P
SDA845
16
MIPI_CSI1_LANE1_N
SDA845
18
GND
20
MIPI_CSI1_LANE2_P
SDA845
22
MIPI_CSI1_LANE2_N
SDA845
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24
GND
26
MIPI_CSI1_LANE3_P
SDA845
28
MIPI_CSI1_LANE3_N
SDA845
30
GND
32
SSC10_SPI2_CLK
SDA845
34
SSC11_SPI2_CS_L
SDA845
36
SSC9_SPI2_MOSI
SDA845
38
SSC8_SPI2_MISO
SDA845
40
GPIO24_CAM2_SLM_IRQ
SDA845
42
GPIO22_CAM0_STROBE_OUT
SDA845
44
GPIO23
SDA845
46
GPIO69_CAM2_SLM_EN
SDA845
48
PM_GPIO12
PM845
50
PM_GPIO10
PM845
52
GND
54
PCIE0_USB4_SS_TX_P
PCIe USB HUB PORT4
56
PCIE0_USB4_SS_TX_M
PCIe USB HUB PORT4
58
PCIE0_USB4_SS_RX_P
PCIe USB HUB PORT4
60
PCIE0_USB4_SS_RX_M
PCIe USB HUB PORT4
6.2.1 MIPI CSI {1/2}
The Secondary High Speed Expansion Connector supports a 4-lane MIPI-CSI bus (MIPI-CSI1/MIPI-CSI2). All
MIPI-CSI signals are routed directly to/from the SDA845.
6.2.2 Clock
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The DragonBoard 845c implements another two CSI clocks on the Secondary High Speed Expansion Connector,
CAM1_MCLK via SDA GPIO_14 for CSI1 and CAM2_MCLK via SDA GPIO_15 for CSI2. These signals are
driven at 1.8V.
6.2.3 SPI{SSC_SPI2}
The DragonBoard 845c implements another SSC SPI interface on the Secondary High Speed Expansion Connector
that connect to Snapdragon 845 processor sensor core. These signals are driven at 1.8V.
• SSC8_SPI2_MISO : Connects to SSC8 of SDA845 SoC. Be configured to MISO.
• SSC9_SPI2_MOSI : Connects to SSC9 of SDA845 SoC. Be configured to MOSI.
• SSC10_SPI2_CLK : Connects to SSC10 of SDA845 SoC. Be configured to CLK.
• SSC11_SPI2_CS_L : Connects to SSC11 of SDA845 SoC. Be configured to CS.
6.2.4 PCIe1
The SDA845 processor has two PCIe ports. The DraonBoard 845c implements one PCIe1 interface on the Secondary
High Speed Expansion Connector that connect to SDA845.
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6.2.5 USB
PCIe->USB
Type A
(USB SS+HS)
Type A
(USB SS+HS)
Type C
(USB SS+HS)
PCIe0
USB hs
USB hs
USB SS
SDA845
USB1
USB2
5V Buck
VBUS
VBUS
PMI8998
VBUS
CC1/CC2
USB2
USB1
USB4
High Speed Exp CONN HS2
High Speed Exp CONN HS1
The DragonBoard 845c implements one USB Supper speed interface on the Secondary High Speed Expansion
Connector.
The Supper Speed USB of HS2 and High Speed USB of HS1 can be combined to one USB3.0 port.
6.2.6 Other signals on Secondary High Speed Connector
The DragonBoard 845c implements more GPIOs on the Secondary High Speed Expansion Connector. The GPIOs
are 1.8V voltage rail.
• GPIO12_CAM2_RST_N - Connects to GPIO_12 of SDA845 SoC. Can be configured to be Camera 2
reset.
• GPIO21_CAM3_RST_N - Connects to GPIO_21 of SDA845 SoC. Can be configured to be Camera 3
reset.
• GPIO116_CAM3_VSYNC_OUT - Connects to GPIO_116 of SDA845 SoC. Can be configured to be an IRQ
line or CAM3 VSYNC.
• GPIO24_CAM2_SLM_IRQ - Connects to GPIO_24 of SDA845 SoC. Can be configured to be an IRQ
line
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• GPIO22_CAM0_STROBE_OUT - Connects to GPIO_22 of SDA845 SoC. Can be configured to be IRQ line or
camera 0 strobe.
• GPIO23 - Connects to GPIO_23 of SDA845 SoC.
• GPIO69_CAM2_SLM_EN - Connects to GPIO_69 of SDA845 SoC.
• PM_GPIO12 - Connects to GPIO_12 of PM845 PMIC.
• PM_GPIO10 - Connects to GPIO_10 of PM845 PMIC.
The IRQ lines create a wake-up event for the SoC.
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7 Power management
DC Jack
5V DC-DC Buck
3.3V DC-DC Buck
4.2V DC-DC Buck
4.2V DC-DC Buck
DSI-HDMI Bridge
1.8V DC-DC Buck
HDMI Type A
Conn
Primisity
Sensor
SDA845 SOM SDA845 Power Grid
SD card
CAN power
Stereo WSA PA
PCIe-> USB
USB->LAN
5V DC-DC Buck USB Type A
Conn x2
LS1 Exp Conn
LS2 Exp Conn
LS3 Exp Conn
VREG_S4A_1P8
VREG_LVS2A_1P8
VREG_LVS1A_1P8
SYS_DCIN
VREG_S4A_1P8
The 96Boards specification defines how power arrives to the board and few supplies that the board needs to provide.
The on-board power requirement for each 96Boards implementation depends on the SoC and the set of peripherals
that are specific to that implementation.
The DragonBoard 845c uses five buck regulators, U0700, U0701, U0800, U0801 and U1505 takes the power in to
the board. The U0700 and U0701 generates 4.2V at 4A. U0700 feeds the WSA power and others, U0701 feed the
SDA845 SOM power. U0800 generates the 3.3V at 1A for sensor and HDMI IO voltage. U0801 generates at 5V at
2A, feeds the HDMI, CAN and LS1/LS3.U1505 generates 5V at 2A, feeds the USB type A power.
7.1 DC Power Input
The 96Boards specification calls for a power to be provided to the board in one of the following ways:
• An 8V to 18V power from a dedicated DC jack.
The DragonBoard 845c supports this requirement through the use of ⑬, ‘SYS_DCIN’ power connector.
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Please note: the SYS_DCIN can be as low as 6.5V on the 845c board.
• An 8V to 18V power from the SYS_DCIN pins on the Low Speed Expansion Connector.
Please note: the SYS_DCIN can be as low as 6.5V on the 845c board.
The DragonBoard 845c supports incoming power through this connector.
• A USB Type C port at 5V.
The DragonBoard 845c supports the 5V from USB Type C port. But it can't support the bring up the system
power on.
7.2 Power Source Selection
The 96Boards specification calls for only one power source to be applied to the board at any given time. Following
this requirement, the user of the DragonBoard 845c should never apply power to the board from ⑬ and the Low
Speed Expansion connector at the same time. There is no active or passive mechanism on the DragonBoard 845c to
prioritize one source over the other.
7.3 Power Sequencing
Upon applying power to the DragonBoard 845c (either one of the two sources), both buck regulators will be enabled
and will start regulating their target voltages. When the output of U0701 is on, it will power the on-board PMIC, the
PMI8998 power management device. PMI8998 generates VPH_PWR which supplies the PM845. The sequencing of
all power rails is set within the PMIC configuration scheme during the production of this part. The user has no access
to alter, modify or change the PMIC power up sequencing.
7.4 Power Measurements
The 96Boards specification calls for a minimum of one current sense resistor to be placed on the board permitting a
basic power measurement functions.
The DragonBoard 845c implements two different power measurements.
7.5 DC-In measurement
A 0.01ohm resistor R0719 is placed in line of the DC12V on the DC input. Placing a probe over the resistor pins will
provide a voltage measurement of the voltage drop across the resistor. Dividing this measurement by 0.01 will give
you the amount of the current flowing into the DC.
7.6 PMIC Power-In measurement
A 0.01ohm resistor R0709 is placed in line to the VBAT_SOM on the 4.2V supply on the output of U0701. Placing
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a probe over the resistor pins will provide a voltage measurement of the voltage drop across the resistor. Dividing
this measurement by 0.01 will give you the amount of the current flowing into the SDA PMIC.
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8 Buttons and status LED’s
8.1 Buttons
8.1.1 Volume up
The Volume UP button (⑯) is used to control the audio volume of the DragonBoard 845c.
8.1.2 Volume down
The Volume Down button (⑰) is used to control the audio volume of the DragonBoard 845c.
8.1.3 Power Button
The push-button ⑳ servers as the power-on/off/sleep button. Upon applying power to the board, the boot process
will start. Once the board is powered on and booted up:
Sleep/suspend
● You can put the device to sleep by pressing this button momentarily.
● You can wake the device from sleep by pressing this button momentarily.
Power Off/On
Option 1: Long press/hold
● While the device is awake, pressing and holding the power button ⑳ for longer than 15 seconds will
result in the device powering off.
● Once powered off, pressing and holding the power button ⑳ for longer than 3 seconds will result in
the device powering on.
Option 2: Short press/hold
● While the device is awake, pressing and holding the power button ⑳ for 2~3 seconds will result in the
user interface displaying the ‘power off’ notice.
● Using a mouse, clicking on this notice will cause the DragonBoard 845c to power off.
● Once powered off, pressing and holding the power button ⑳ for longer than 3 seconds will result in
the device powering on.
8.1.4 Reset Button
The on-board ⑰ push-button has two functions, it serves as a reset button and as a Volume button.
The reset function needs to be software configured setting.
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8.1.5 Force_USB_BOOT Button
The on-board ⑱ push-button is used for emergency USB boot for during development.
8.2 LED’s
There are two status LEDs and four User LEDs on the 845c. The Status LEDs report the status of the Bluetooth and
Wi-Fi devices onboard. The user LEDs are driven by the SoC directly.
8.2.1 User LED 1-4
The four user LEDs are surface mount Green LEDs, 0603 size, located next to the two USB type A connector and
labeled ‘USER LEDS 3 2 1 0’.
8.2.2 Bluetooth status
The BT LED on the DragonBoard 845c is located next to the USB OTG connector; this LED reflects the status of
the Bluetooth device.
8.2.3 WiFi status
The WIFI LED on the DragonBoard 845c is located beside the BT LED, this LED reflects the status of the Wi-Fi
device.
8.2.4 Power Indicator LED
The power indicator on the DragonBoard 845c is located beside the DC jack, this LED notify the user that the power
is applied.
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9 Boot configuration
There is a Dip Switch ⑮ located on the top of the development board.
Switch 1: NA.
Switch 2: 'ONBOARD_DEBUG_UART_EN_N' SD BOOT’, when set to ‘ON’ position, will force the SDA UART
log to USB port, when set to ‘OFF’ position, will force the SDA UART log to Low Speed Expansion Connector
LS1.
Switch 3: ‘CBL_PWR_N’, when set to ‘ON’ position, will force the device to boot up automatically; when set to
'OFF' position, will force the deice to boot up by manual power button.
Switch 4: ‘SW_DSI1_TO_LT9611_N’, when set to ‘ON’ position, will force the MIPI-DSI1 to High Speed
Expansion Connector HS1; when set to 'OFF ' position, the MIPI-DSI1 to LT9611 DSI-HDMI bridge.
Switch 5: ' SENSOR_DISCONNECT ', when set to 'ON' position, will force the SDA845 SSC sensor SPI/I2C to
Low Speed Expansion Connector; when set to 'OFF', will force the SSC sensor SPI/I2C to onboard sensor.
Switch 6: ' IMU_EXT_CLK_TOGGLE ', when set to 'ON' position, the onboard ICM-42688 sensor will use the
external clk of GPIO78 from SoC; when set to 'OFF', the onboard ICM-42688 sensor will use another interrupt
output to SoC GPIO118. These GPIOs needs the software configure setting.
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10 Mechanical specification
10.1 Board dimensions
Bottom
