LIFI LABS LCM3T Wifi module User Manual

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Document ID	3608753
Application ID	NEmHOe9j53I4DYPVEoVaZg==
Document Description	Users Manual
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	78.1kB (976238 bits)
Date Submitted	2017-10-18 00:00:00
Date Available	2017-10-18 00:00:00
Creation Date	2017-09-08 17:14:10
Producing Software	Microsoft® Word 2010
Document Lastmod	2017-10-17 18:04:25
Document Title	Users Manual
Document Creator	Microsoft® Word 2010
Document Author:	LF

LCM3C and LCM3T
User Guide
1 MP3 Development Platform
1.1.
MP3 layout and interfaces
Figure 1-1 Front view of the LCM3/LCM3T development platform
Table 1-1 MP3 components
S1,S2
Input Power Switch
S3
SW state for ALS PW
S4
For CHIP PU
S5
For Dimmer
S5
Reset for TLC555
P1
LCM3 module
P2
USB2.0 socket with 5V power input
P3
MFI daughter board header
P4
Jumper for selecting dimming
frequency, open:50Hz, Close:60Hz
TM1814 Logic Translator,
74AHCT1G125SE
U1
Voltage Regulator LM1117
U3, U5
TM1814, RGBW LED with SPI-mode
LED driver IC on
U4
TLC555
U6
FT2232HL USB-RS232
U7
74HCT221
U8
M93CxS, E2PROM
D1
LED for indicator of 3.0V power
D2, Q5
IR LED and its driver MOS
LD1
RGBW LED IC
Q1~Q4
MOS driver for RGBW LED
LDR1
Ambient Light Sensor
Q7
2N7002K, MOS for control Q6
Q6
SSF6007, MOS for ADC power off
time sense
R26
Variant Resistor
U2
1.2.
MP3 functionality
This section lists the power supply, jumper settings, push button, headers interfaces and
their pin assignments.
Table 1-2 Power supply
Component
Definition and description
P2
Mini-USB interface, for ART and power supply
S1,S2
Input Power Switch
Table 1-3 Header interfaces
Header
Pin no.
P1
P1.1
P1.28
P1.2
Ground
3.3V Power
GPIO[13]
P1.3
GPIO[12]
P1.5
32.768k crystal
positive input
32.768k crystal
negative input
CHIP PU
P1.6
VDET_1
P1.7
VDET_2
P1.8
GREEN PWM
GPIO[25]
P1.9
BLUE PWM
GPIO[26]
P1.10
WHITE PWM
GPIO[27]
P1.4
Function1
Function2
Function3
Function4
ESP32
GPIO no.
GPIO[10]
I2C slave data
GPIO[11]
P1.11
MTDI
P1.12
MTCK
P1.13
MTMS
P1.14
MTDO
P1.15
RED PWM
GPIO[2]
P1.16
IR
GPIO[4]
P1.17
RUN MODE
P1.18
Power off time
charge control
P1.19
SCL
P1.20
SDA
P1.21
GPIO[22]
P1.22
Power time read
control
Dimmer2
P1.23
Dimmer1
GPIO[21]
P1.24
UART_RX
P1.25
UART_TX
P1.26
P1.27
NC
GPIO[5]
GPIO[19]
2 PCB Design Guidelines
2.1. GND
2.1.1. Placement of capacitor shunted to GND

Place bypass capacitors as close to the respective pins as possible.
Place at least one dedicated ground via for each capacitor shunted to ground and put
ground via as close to the capacitors as possible.

Good capacitor placement (2 capacitors with 2 dedicated ground vias)
Bad capacitor placement (2 capacitors sharing only 1 ground via)
2.1.2. GND
Avoid large ground planes without ground vias. The ground plane shown in Figure 2-1
can act like an antenna radiating unwanted signals to other parts of the reference
board.
Figure 2-1 Ground plane without ground vias
USB

Use 90 Ω differential lines to rout USB D+/D-.

Avoid routing USB lines close to the edge of the board.

Avoid routing USB lines with 90o turns. Use 45°transition.

Avoid placing stub components on the USB data lines.
15 KΩ
Avoid creating stubs if possible
Correct way to connect to resistors
15 KΩ
RF design for Wi-Fi modules
This section is more related to the Wi-Fi modules, LCM3, than to the RB01.
 Route
all differential and single-ended traces for RF signal with an impedance
of 50 Ω. Avoid right angle line routing. Espressif recommends all RF
components and traces to be on the same side of the board.
Must
not rout any trance under the LCM3 module except of GND.

Avoid vias as much as possible in the RF traces. Do not use any test points on any
RF traces or component.

Minimize the length of all RF traces since FR4 material incurs losses at RF
frequencies. Minimizing the trace length reduces the overall signal loss. If there are
different Tx path and Rx path, Keeping the Tx path short is more important than
keeping the Rx path short.

If there are different Tx path and Rx path, a loss in signal strength in the Tx path
cannot be recovered, but the Rx signal can be amplified on-board, to compensate
for loss.

Do not put metal under the U.FL connectors on layer 1. Make sure that the ground
is present on all other layers of the board.

Keep the length of the RF differential output traces as short as possible.

Use separate vias to tie all the power pins to the power traces or power plane. Do
not make the power pins share the same VDD via.

Avoid power trace routing underneath the ESP32.

Enclose the crystal traces with ground plane and avoid routing power traces
underneath the crystal.
Board stack-up
The MP3 is implemented on a two-layer board:

Layer 1 is for signal traces.

Layer 2 is mainly ground plane.
The MP3 is comprised of the elements listed in this section, with the board stack-up as
shown in Figure 2-2.

2-layer board

Total stack thickness: 63 mil/1.6 mm

Material: FR4 Tg 140

Impedance @ 2.4 GHz: 50 Ω
Top side layer 1 (½ Oz Cu
foil)
Total
stack
63
1.6
mils/
mmFR4 – 61 mils +/- 1 mil
+/- 10%
Bottom side layer 2 (½ Oz Cu foil)
Figure 2-2 MP3 board stack-up
3
Statement of use
Operating conditions
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions:

This device may not cause harmful interference.

This device must accept any interference received, including interference that may
cause undesired operation.
Changes or modifications to this unit not expressly approved by the party responsible for
compliance could void the user's authority to operate the equipment.
NOTE
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference
in a residential installation. This equipment generates, uses and can radiate radiofrequency
energy and, if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will
not occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and on,
the user is encouraged to try to correct the interference by one or more of the following
measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
- Consult the dealer or an experienced radio/ TV technician for help.
RF Warning Statement
To comply with FCC RF exposure compliance requirements, the antennas used for this transmitter must
be installed to provide a separation distance of at least 20 cm from all persons and must not
be co-located or operating in conjunction with any other antenna or transmitter.This device is intended
only for OEM integrators under the following conditions:
1) The antenna must be installed such that 20 cm is maintained between the antenna and users, and
2) The transmitter module may not be co-located with any other transmitter or antenna.
As long as two conditions above are met, further transmitter test will not be required as something related
to RF exposure. However, the OEM integrator is still responsible for testing their end-product for any
additional compliance requirements required with this module installed. To ensure compliance with all
non-transmitter functions the host manufacturer is responsible for ensuring compliance with the module(s)
installed and fully operational. For example, if a host was previously authorized as an unintentional
radiator under the Declaration of Conformity procedure without a transmitter certified module and a
module is added, the host manufacturer is responsible for ensuring that the after the module is installed
and operational the host continues to be compliant with the Part 15B unintentional radiator requirements.
The module is limited to OEM installation ONLY. The module is limited to installation in mobile or fixed
application. We hereby acknowledge our responsibility to provide guidance to the host manufacturer in
the event that they require assistance for ensuring compliance with the Part 15 Subpart B requirements.
IMPORTANT NOTE: In the event that these conditions cannot be met (for example certain laptop
configurations or co-location with another transmitter), then the FCC authorization is no
longer considered valid and the FCC ID cannot be used on the final product. In these circumstances, the
OEM integrator will be responsible for reevaluating the end product (including the transmitter) and
obtaining a separate FCC authorization.
End Product Labeling
This transmitter module is authorized only for use in device where the antenna may be installed such that
20 cm may be maintained between the antenna and users. The final end product must be labeled in a
visible area with the following: “Contains FCC ID: 2AA53-LCM3T and IC: 11475A-LCM3T”. The grantee's
FCC ID and IC Number can be used only when all FCC and ISED compliance requirements are met.
The following FCC part 15.19 statement has to also be available on the label: This device complies with
Part 15 of FCC rules. Operation is subject
to the following two conditions:
(1) this device may not cause harmful interference and
(2) this device must accept any interference received, including interference that may cause undesired
operation.
Installation Guideline
Antenna information
WiFi antenna: PCB antenna and max gain 1.9dBi
Manual Information to the End User
The OEM integrator has to be aware not to provide information to the end user regarding how to install or
remove this RF module in the user’s manual of the end product which integrates this module.
In the user manual of the end product, the end user has to be informed that the equipment complies with
FCC radio-frequency exposure guidelines set forth for an uncontrolled environment. The end user has to
also be informed that any changes or modifications not expressly approved by the manufacturer could
void the user's authority to operate this equipment. The end user manual shall include all required
regulatory information/warning as show in this manual.
This device complies with Part 15 of the FCC Rules and with RSS-247 of Industry Canada. Operation is
subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause undesired
operation.
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts
de licence. L'exploitation est autorisée aux deux conditions suivantes :
(1) l'appareil ne doit pas produire de brouillage, et
(2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est
susceptible d'en compromettre le fonctionnement.
Radiation Exposure Statement:
This equipment complies with IC radiation exposure limits set forth for an uncontrolled environment. This
equipment should be installed and operated with minimum distance 20cm between the radiator & your
body.
Déclaration d'exposition aux radiations:
Cet équipement est conforme aux limites d'exposition aux rayonnements IC établies pour un
environnement non contrôlé. Cet équipement doit être installé et utilisé avec un minimum de 20 cm de
distance entre la source de rayonnement et votre corps.

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Create Date                     : 2017:09:08 17:14:10+08:00
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