Ai Thinker Technology ESP32S Wi-Fi & Bluetooth Module User Manual ESP 32S

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Users Manual

ESP-32S User Manual

REV 1.0

2017.3

ESP-32S User Manual

FCC STATEMENT

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) This device may not cause harmful interference.

(2) This device must accept any interference received, including interference that may cause undesired

operation.

Any changes or modifications not expressly approved by the party responsible for compliance could void the

user’s authority to operate the equipment.

Please notice that if the FCC identification number is not visible when the module is installed inside another

device, then the outside of the device into which the module is installed must also display a label referring to

the enclosed module. This exterior label can use wording such as the following: “Contains FCC ID:

2AHMR-ESP32S” any similar wording that expresses the same meaning may be used.

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This

equipment should be installed and operated with a minimum distance of 20cmbetween the radiator & your

body. This transmitter must not be co-located or operating in conjunction with any other antenna or

transmitter.

The module is limited to OEM installation ONLY.

The OEM integrator is responsible for ensuring that the end-user has no manual instruction to remove or

install module.

The module is limited to installation in mobile application;

A separate approval is required for all other operating configurations, including portable configurations with

respect to Part 2.1093 and difference antenna configurations.

There is requirement that the grantee provide guidance to the host manufacturer for compliance with Part

15B requirements.

ESP-32S User Manual
Contents
Preface................................................................................................................................................ 1
Pin Definitions....................................................................................................................................3
1 Pin Layout................................................................................................................................. 3
2 Pin Description......................................................................................................................... 4
3 Strapping Pins...........................................................................................................................5
Functional Description.......................................................................................................................7
1 CPU and Internal Memory........................................................................................................7
2 External Flash and SRAM..........................................................................................................7
3 Crystal Oscillators..................................................................................................................... 7
4 Power Consumption.................................................................................................................8
5 Peripherals and Sensors........................................................................................................... 9
5.1 Peripherals and Sensors Description.............................................................................9
5.2 Peripheral Schematics................................................................................................. 14
Electrical Characteristics..................................................................................................................15
1 Absolute Maximum Ratings................................................................................................... 15
2 Recommended Operating Conditions....................................................................................15
3 Digital Terminal Characteristics............................................................................................. 15
4 Wi-Fi Radio............................................................................................................................. 16
5 Bluetooth LE Radio................................................................................................................. 16
5.1 Receiver....................................................................................................................... 16
5.2 Transmit...................................................................................................................... 17
6 Reflow Profile......................................................................................................................... 17
Schematics....................................................................................................................................... 18

ESP-32S User Manual

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1.Preface

ESP-32S is a powerful, generic Wi-Fi +BT+BLE MCU module that targets a wide variety of applications,

ranging from low-power sensor networks to the most demanding tasks, such as voice encoding, music

streaming and MP3 decoding.

At the core of this module is the ESP32-D0WDQ6 chip*, which is designed to be scalable and adaptive. There

are two CPU cores that can be individually controlled or powered, and the clock frequency is adjustable from

80 MHz to 240 MHz . The user may also power off the CPU and make use of the low-power coprocessor to

constantly monitor the peripherals for changes or crossing of thresholds. ESP32 integrates a rich set of

peripherals, ranging from capacitive touch sensors, Hall sensors, low-noise sense amplifiers, SD card

interface, Ethernet, high speed SDIO/SPI, UART, I2S and I2C.

The integration of Bluetooth, Bluetooth LE and Wi-Fi ensures that a wide range of applications can be

targeted, and that the module is future proof: using Wi-Fi allows a large physical range and direct connection

to the internet through a Wi-Fi router, while using Bluetooth allows the user to conveniently connect to the

phone or broadcast low energy beacons for its detection. The sleep current of the ESP32 chip is less than 5

µA, making it suitable for battery powered and wearable electronics applications. ESP-32S supports data

rates of up to 150 Mbps, and 22 dBm output power at the PA to ensure the widest physical range. As such

the chip does offer industry-leading specifications and the best performance for electronic integration, range,

power consumption, and connectivity.

The operating system chosen for ESP32 is free RTOS with LWIP; TLS 1.2 with hardware acceleration is built in

as well. Secure (encrypted) over the air (OTA) upgrade is also supported, so that developers can continually

upgrade their products even after their release.

Table 1 provides the specifications of ESP-32S.

Table 1: ESP-32S Specifications

Categories

Items

Specifications

Hardware

Module interface

SD card, UART, SPI, SDIO, I2C, LED PWM, Motor PWM,

I2S, I2C, IR

GPIO, capacitive touch sensor, ADC, DAC, LNA pre-

amplier

On-chip sensor

Hall sensor, temperature sensor

On-board clock

40 MHz crystal

Operating voltage

2.2 〜3.6V

Operating current

Average: 80 mA

Operating temperature range

-40°C ~ 85°C *

Ambient temperature range

Normal temperature

Package size

18 mm x 25.5 mm x 2.8 mm

Software

Wi-Fi mode

Station/SoftAP/SoftAP+Station/P2P

Security

WPA/WPA2/WPA2-Enterprise/WPS

Encryption

AES/RSA/ECC/SHA

Firmware upgrade

UART Download / OTA (via network) / download and

write firmware via host

Software development

Supports Cloud Server Development / SDK for custom

firmware development

Network protocols

IPv4, IPv6, SSL, TCP/UDP/HTTP/FTP/MQTT

User configuration

AT instruction set, cloud server, Android/iOS app

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2. Pin Definitions

2.1 Pin Layout

Figure 1: Top and Side View of ESP-32S

Table 2: ESP-32S Dimensions

Length

Width

Height

PAD size (bottom)

Pin pitch

Shielding can height

PCBthickness

18 mm

25.5 mm

2.8± 0.1 mm

0.85 mm x 0.9 mm

1.27 mm

2 mm

±0.1mm

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2.2 Pin Description

ESP -32S has 39 pins. See pin definitions in Table 3.

Table 3: ESP-32S Pin Definitions

Name

No.

Type

Function

GND

Ground

3V3

Power supply.

Chip-enable signal. Active high.

SENSOR_VP

GPI036, SENS0R_VP, ADC_H, ADC1_CH0, RTC_GPI00

SENSOR_VN

GPI039, SENS0R_VN, ADC1_CH3, ADC_H, RTC_GPI03

IO34

GPI034, ADC1_CH6, RTC_GPI04

IO35

GPI035, ADC1_CH7, RTC_GPI05

IO32

I/O

GPI032, XTAL_32K_P (32.768 kHz crystal oscillator input), ADC1_CH4，

T0UCH9, RTC_GPI09

IO33

I/O

GPI033, XTAL_32K_N (32.768 kHz crystal oscillator output), ADC1_CH5,

T0UCH8, RTC_GPI08

IO25

I/O

GPI025, DAC_1, ADC2_CH8, RTC_GPI06, EMAC_RXD0

IO26

I/O

GPI026, DAC_2, ADC2_CH9, RTC_GPI07, EMAC_RXD1

IO27

I/O

GPI027, ADC2_CH7, T0UCH7, RTC_GPI017, EMAC_RX_DV

IO14

I/O

GPraM，ADC2_CH6, T0UCH6,MTMS, HSPHK，HS2_CLK, SD_CLK,

EMAC_TXD2

IO12

I/O

GPI012, ADC2_CH5, T0UCH5, RTC_GPI015, MTDL HSPIQ, HS2_DATA2,

SD_DATA2, EMAC_TXD3

GND

Ground

IO13

I/O

GPI013, ADC2_CH4, T0UCH4, RTC_GPI014, MTCK, HSPID, HS2_DATA3,

SD_DATA3, EMAC_RX_ER

SHD/SD2*

I/O

GPIO9, SD_DATA2, SPIHD, HS1_DATA2, U1RXD

SWP/SD3*

I/O

GPIO10, SD_DATA3, SPIWP, HS1_DATA3, U1TXD

SCS/CMD*

I/O

GPIO11, SD_CMD, SPICSO, HS1_CMD, U1RTS

SCK/CLK*

I/O

GPIO6, SD_CLK, SPICLK, HS1_CLK, U1CTS

SDO/SD0*

I/O

GPIO7, SD_DATA0, SPIQ, HS1_DATA0, U2RTS

SDI/SD1*

I/O

GPIO8, SD_DATA1, SPID, HS1_DATA1, U2CTS

IO 15

I/O

GPIO15, ADC2_CH3, T0UCH3, MTD0, HSPICSO, RTC_GPI013, HS2_CMD,

SD_CMD, EMAC_RXD3

IO 2

I/O

GPIO2, ADC2_CH2, T0UCH2,HSPIWP, HS2_DATA0, SD_DATA0

IO 0

I/O

GPIO0, ADC2_CH1, T0UCH1, CLK_0UT1, EMAC_TX_CLK

IO 4

I/O

GPIO4,ADC2_CH0,T0UCH0, RTC_GPI010, HSPIHD, HS2_DATA1,

SD_DATA1, EMAC_TX_ER

IO 16

I/O

GPIO16, HS1_DATA4, U2RXD, EMAC_CLK_0UT

IO 17

I/O

GPIO17, HS1_DATA5, U2TXD, EMAC_CLK_0UT_180

IO 5

I/O

GPIO5, VSPICSO, HS1_DATA6, EMAC_RX_CLK

IO18

I/O

GPIO18, VSPHK，HS1_DATA7

IO19

I/O

GPIO19, VSPIQ, UOCTS, EMAC—TXDO

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Name

No.

Type

Function

IO21

I/O

GPIO21, VSPIHD, EMAC_TX_EN

RXD0

I/O

GPIO3, U0RXD, CLK_OUT2

TXD0

I/O

GPIO1, U0TXD, CLK_OUT3, EMAC_RXD2

IO22

I/O

GPIO22, VSPIWP，U0RTS, EMAC_TXD1

IO23

I/O

GPIO23, VSPID, HS1_STROBE

GND

Ground

GND

Ground

2.3 Strapping Pins

ESP32-D0WDQ6 has five strapping pins. Software can read the value of these five bits from the register

”GPIO_STRAPPING”. During the chip power-on reset, the latches of the strapping pins sample the voltage

level as strapping bits of ”0” or ”1”，and hold these bits until the chip is powered down or shut down.

Each strapping pin is connected with its internal pull-up/pull-down during the chip reset. Consequently, if a

strap-ping pin is unconnected or the connected external circuit is high-impedance, the internal weak

pull-up/pull-down will determine the default input level of the strapping pins.

To change the strapping bit values, users can apply the external pull-down/pull-up resistances, or apply the

host MCU5s GPIOs to control the voltage level of these pins when powering ESP32 on.

After reset, the strapping pins work as the normal functions pins.

Refer to Table 4 for detailed boot modes of configuration by strapping pins.

Table 4: Strapping Pins

Voltage of Internal LDO (VDD_SDIO)

Default

3.3V

1.8V

MTDI

Pull-down

Booting Mode

Default

SPI Flash Boot

Download Boot

GPIO0

Pull-up

GPIO2

Pull-down

Don’t-care

Debugging Log on U0TXD During Booting

Default

U0TXD Toggling

U0TXD Silent

MTDO

Pull-up

Timing of SDIO Slave

Default

Falling-edge Input

Falling-edge Output

Falling-edge Input

Rising-edge Output

Rising-edge Input

Falling-edge Output

Rising-edge Input

Rising-edge Output

MTDO

Pull-up

GPIO5

Pull-up

Note:

* Pins SCK/CLK，SDO/SD0, SDI/SD1, SHD/SD2, SWP/SD3 and SCS/CMD, namely, GPIO6 to GPIO11 are

connected to the integrated SPI flash integrated on ESP-32S and are not recommended for other uses.

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Note:

Firmware can configure register bits to change the settings of ”Voltage of Internal LDO(VDD_SDIO)”

and ”Timing of SDIO Slave” after booting.

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3. Functional Description

This chapter describes the modules and functions integrated in ESP-32S.

3.1 CPU and Internal Memory

ESP32-DOWDQ6 contains two low-power Xtensa® 32-bit LX6 microprocessors. The internal memory

includes:

•448 KB of ROM for booting and core functions.

•520 KB of on-chip SRAM for data and instruction.

•8KB of SRAM in RTC, which is called RTC SLOW Memory and can be accessed by the co-processor during

the Deep-sleep mode.

•8 KB of SRAM in RTC, which is called RTC FAST Memory and can be used for data storage; it is accessed

by the main CPU during RTC Boot from the Deep-sleep mode.

•1 kbit of eFuse, of which 256 bits are used for the system (MAC address and chip configuration) and the

remaining 768 bits are reserved for customer applications, including Flash-Encryption and Chip-ID.

3.2 External Flash and SRAM

ESP32-DOWDQ6 supports up to four 16-MB external QSPI flash and SRAM with hardware encryption based

on AES to protect developer’s programs and data.

ESP32 can access the external QSPI flash and SRAM through high-speed caches.

•Up to 16 MB of external flash are memory-mapped onto the CPU code space, supporting 8, 16 and

32-bit access. Code execution is supported.

•Up to 8 MB of external flash/SRAM are memory-mapped onto the CPU data space, supporting 8, 16 and

32-bit access. Data-read is supported on the flash and SRAM. Data-write is supported on the SRAM.

ESP-32S integrates 4 MB of external SPI flash. The 4-MB SPI flash can be memory-mapped onto the CPU code

space, supporting 8, 16 and 32-bit access. Code execution is supported. The integrated SPI flash is connected

to GPIO6, GPIO7, GPIO8, GPIO9, GPIO10 and GPIO11. These six pins cannot be used as regular GPIO.

3.3 Crystal Oscillators

The frequencies of the main crystal oscillator supported include 40 MHz, 26 MHz and 24 MHz. The accuracy

of crystal oscillators applied should be ±10PPM,and the operating temperature ranges from-40°C to 85°C.

When using the downloading tools, remember to select the right crystal oscillator type. In circuit design,

capacitors C1 and C2 that connect to the earth are added to the input and output terminals of the crystal

oscillator, respectively. The values of the two capacitors can be flexible, ranging from 6 pF to 22 pF. However,

the specific capacitive values of C1 and C2 depend on further tests and adjustments of the overall

performance of the whole circuit. Normally, the capacitive values ofC1 and C2 are within 10 pF when the

crystal oscillator frequency is 26 MHz, or 10 pF<C1 and C2<22 pF when the crystal oscillator frequency is 40

MHz.

The frequency of the RTC crystal oscillator is typically 32 kHz or 32.768 kHz. The accuracy can be out of the

range of ±20 PPM, when the internal calibration is applied to correct the frequency offset. When the chip

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operates in low-power modes, the application chooses the external low-speed (32 kHz) crystal clock, rather

than the internal RC oscillators, to achieve the accurate wakeup time.

3.4 Power Consumption

With the advanced power management technology, ESP32-D0WDQ6 can switch between different power

modes as follows:

•Power mode

- Active mode: chip radio is powered on. The chip can receive, transmit, or listen.

- Modem-sleep mode: the CPU is operational and the clock is configurable. Wi-Fi / Bluetooth

baseband and radio are disabled.

- Light-sleep mode: the CPU is paused. The RTC and ULP-coprocessor are running. Any wake-up

events (MAC, host, RTC timer, or external interrupts) will wake up the chip.

- Deep-sleep mode: Only RTC is powered on. Wi-Fi and Bluetooth connection data are stored in RTC

memory. The ULP-coprocessor can work.

- Hibernation mode: The internal 8MHz oscillator and ULP-coprocessor are disabled. The RTC

recovery memory is powered down. Only one RTC timer on the slow clock and some RTC GPIOs are

active. The RTC timer or the RTC GPIOs can wake up the chip from the Hibernation mode.

•Sleep Pattern

- Association sleep pattern: The power mode switches between the active mode and

Modem-sleep/Light- sleep mode during this sleep pattern. The CPU, Wi-Fi, Bluetooth, and radio

wake up at pre-determined intervals to keep Wi-Fi / BT connections on.

- ULP sensor-monitored pattern: The main CPU is in the Deep-sleep mode. The ULP co-processor does

sensor measurements and wakes up the main system, based on the measured data from sensors.

The power consumption varies with different power modes/sleep patterns, and work status, of functional

modules (see Table 5).

Table 5: Power Consumption by Power Modes

Power mode

Comment

Power consumption

Active mode (RF working)

Wi-Fi Tx packet 13 dBm ~ 21 dBm

160 〜260 mA

Wi-Fi / BT Tx packet 0 dBm

120mA

Wi-Fi / BT Rx and listening

80 〜90 mA

Association sleep pattern (by Light-

0.9 mA@DTIM3, 1.2 mA@DTIM1

Modem-sleep mode

The CPU is powered on.

Max speed: 20 mA

Normal: 5 〜10 mA

Slow speed: 3 mA

Light-sleep mode

0.8 mA

Deep-sleep mode

The ULP-coprocessor is powered on.

0.15 mA

ULP sensor-monitored pattern

25 µA@1% duty

RTC timer + RTC memories

20 µA

Hibernation mode

RTC timer only

5µA

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3.5 Peripherals and Sensors

3.5.1 Peripherals and Sensors Description

Table 6: Peripherals and Sensors Description

Interface

Signal

Function

ADC1_CH0

SENSOR_VP

ADC1_CH3

SENSOR_VN

ADC1_CH4

IO32

ADC1_CH5

IO33

ADC1_CH6

IO34

ADC1_CH7

IO35

ADC2_CH0

IO4

ADC

ADC2_CH1

IO0

Two 12-bit SAR ADCs

ADC2_CH2

IO2

ADC2_CH3

IO15

ADC2_CH4

IO13

ADC2_CH5

IO12

ADC2_CH6

IO14

ADC2_CH7

IO27

ADC2_CH8

IO25

ADC2_CH9

IO26

Ultra Low Noise

SENSOR_VP

IO36

Provides about 60dB gain by using larger

Analog Pre-Amplifier

SENSOR_VN

IO39

capacitors on PCB

DAC

DAC_1

IO25

Two 8-bit DACs

DAC_2

IO26

TOUCH0

IO4

TOUCH1

IO0

TOUCH2

IO2

TOUCH3

IO15

Touch Sensor

TOUCH4

IO13

Capacitive touch sensors

TOUCH5

IO12

TOUCH6

IO14

TOUCH7

IO27

TOUCH8

IO33

TOUCH9

IO32

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Interface

Signal

Function

SD/SDIO/MMC Host

HS2_CLK

MTMS

Supports SD memory card V3.01 standard

HS2_CMD

MTDO

HS2_DATA0

IO2

HS2_DATA1

IO4

HS2_DATA2

MTDI

HS2_DATA3

MTCK

Motor PWM

PWMO_OUTO~2

Any GPIOs*

Three channels of 16-bit timers generate

PWM1_OUT_INO~2

PWM0_FLT_IN0~2

PWM1_FLT_IN0~2

PWM0_CAP_IN0~2

PWM1_CAP_IN0~2

PWM0_SYNC」N0~2

PWM1_SYNC」N0~2

LED PWM

ledc_hs_sig_out0~7

Any GPIOs*

16 independent channels @80MHz

Iedc_Is_sig_out0~7

UART

U0RXD_in

Any GPIOs*

Two UART devices with hardware

U0CTS_in

U0DSR_in

U0TXD_out

U0RTS_out

U0DTR_out

U1RXD_in

U1CTS_in

U1TXD_out

U1RTS_out

U2RXD_in

U2CTS_in

U2TXD_out

U2RTS_out

I2C

I2CEXT0_SCL_in

Any GPIOs*

Two I2C devices in slave or master modes

I2CEXT0_SDA_in

I2CEXT1_SCL_in

I2CEXT1_SDA_in

I2CEXT0_SCL_out

I2CEXT0_SDA_out

I2CEXT1_SCL_out

I2CEXT1_SDA_out

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Interface

Signal

Function

I2S

I2S0l_DATA_in0~15

I2SOO_BCK_in

I2S0O_WS_in

I2S0I_BCK_in

I2S0I_WS_in

I2S0I_H_SYNC

I2S0I_V_SYNC

I2S0I_H_ENABLE

I2S0O_BCK_out

I2S0O_WS_out

I2S0I_BCK_out

I2S0I_WS_out

I2S0O_DATA_out0~23

I2S1l_DATA_inO~15

I2S1O_BCK_in

I2S1O_WS_in

I2S1I_BCK_in

I2S1LWS_in

I2S1LH_SYNC

I2S1I_V_SYNC

I2S1I_H_ENABLE

I2S1O_BCK_out

I2S1O_WS_out

I2S1l_BCK_out

I2S1l_WS_out

I2S1O_DATA_outO~23

Any GPIOs*

Stereo input and output from/to the audio

codec, and parallel LCD data output

Remote Controller

RMT_SIG_IN0~7

RMT_SIG_OUTO~7

Any GPIOs*

Eight channels of IR transmitter and

receiver for various waveforms

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Interface

Signal

Function

SPIHD

SHD/SD2

SPIWP

SWP/SD3

SPICS0

SCS/CMD

SPICLK

SCK/CLK

SPIQ

SDO/SD0

SPID

SDI/SD1

HSPICLK

IO14

HSPICS0

IO15

Supports Standard SPI, Dual SPI, and

Parallel QSPI

HSPIQ

IO12

Quad SPI that can be connected to the

HSPID

IO13

external flash and SRAM

HSPIHD

IO4

HSPIWP

IO2

VSPICLK

IO18

VSPICS0

IO5

VSPIQ

IO19

VSPID

IO23

VSPIHD

IO21

VSPIWP

IO22

HSPIQ_in/_out

Standard SPI consists of clock,

HSPID_in/_out

chip-select, MOSI and MISO. These SPIs

HSPICLK_in/_out

can be connected to LCD and other

HSPI_CS0_in/_out

external devices. They support the

HSPI_CS1_out

following features:

General Purpose

HSPI_CS2_out

Any GPIOs*

• both master and slave modes;

SPI

VSPIQ_in/_out

• 4 sub-modes of the SPI format

VSPID_in/_out

transfer that depend on the clock

VSPICLK_in/_out

phase (CPHA) and clock polarity

(CPOL) control;

• CLK frequencies by a divider;

• up to 64 bytes of FIFO and DMA.

VSPI_CS0_in/_out

VSPI_CS1_out

VSPI_CS2_out

MTDI

IO12

JTAG

MTCK

IO13

JTAG for software debugging

MTMS

IO14

MTDO

IO15

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Interface

Signal

Function

SD_CLK

IO6

SDIO interface that conforms to the

industry standard SDIO 2.0 card

specification. On ESP -32S these pins are

connected to the integrated SPI flash.

SD_CMD

IO11

SDIO Slave

SD_DATA0

IO7

SD_DATA1

IO8

SD_DATA2

IO9

SD_DATA3

IO10

EMAC_TX_CLK

IO0

EMAC_RX_CLK

IO5

EMAC_TX_EN

IO21

EMAC—TXDO

IO19

EMAC—TXD1

IO22

EMAC—TXD2

IO14

EMAC—TXD3

IO12

EMAC_RX_ER

IO13

EMAC_RX_DV

IO27

EMAC

EMAC_RXD0

IO25

Ethernet MAC with MII/RMII interface

EMAC_RXD1

IO26

EMAC_RXD2

TXD

EMAC_RXD3

IO15

EMAC_CLK_OUT

IO16

EMAC_CLK_OUT_180

IO17

EMAC_TX_ER

IO4

EMAC_MDC_out

Any GPIOs*

EMAC_MDI_in

Any GPIOs*

EMAC_MDO_out

Any GPIOs*

EMAC_CRS_out

Any GPIOs*

EMAC_COL_out

Any GPIOs*

Note:

•Functions of Motor PWM,LEDPWM,UART,l2C,l2S,general purpose SPI and Remote Controller can be

configured to any GPIO except GPIO6,GPIO7,GPIO8,GPIO9,GPIO10 and GPIO11.

•In Table6, for the items marked with ”Any GPIOs*” in the ”Pin” column, users should note that

GPIO6, GPIO7, GPIO8, GPIO9, GPIO10 and GPIO11 are connected to the integrated SPI flash of

ESP-32S and are not recommended for other uses.

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3.5.2 Peripheral Schematics

Figure 2: ESP-32S Peripheral Schematics

Note:

The MTDI should be kept at low electric level.

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4. Electrical Characteristics

4.1 Absolute Maximum Ratings

Table 7: Absolute Maximum Ratings

Rating

Condition

Value

Unit

Storage temperature

-40 ~ 85

°C

Maximum soldering temperature

260

°C

Supply voltage

IPC/JEDEC J-STD-020

+2.2 〜+3.6

4.2 Recommended Operating Conditions

Table 8: Recommended Operating Conditions

Operating condition

Symbol

Min

Typ

Max

Unit

Operating temperature

-40

°C

Supply voltage

VDD

2.2

3.3

3.6

Operating current

IVDD

0.5

4.3 Digital Terminal Characteristics

Table 9: Digital Terminal Characteristics

Terminals

Symbol

Min

Typ

Max

Unit

Input logic level low

VIL

-0.3

0.25VDD

Input logic level high

VIH

0.75VDD

VDD+0.3

Output logic level low

VOL

0.1VDD

Output logic level high

VOH

0.8VDD

Note:

The specifications in this chapter have been tested under the following generalcondition: Vbat =3.3V’Ta

=27°C，unless otherwise specified.

ESP-32S User Manual

Shenzhen Ai-Thinker Technology Co., Ltd http://www.ai-thinker.com

4.4 Wi-Fi Radio

Table 10: Wi-Fi Radio Characteristics

Description

Min

Typ

Max

Unit

General Characteristics

Input frequency

2412

2484

MHz

Input impedance

Input reflection

-10

Output power of PA

15.5

19.5

21.5

dBm

Sensitivity

DSSS, 1 Mbps

-98

dBm

CCK, 11 Mbps

-90

dBm

OFDM, 6 Mbps

-93

dBm

OFDM, 54 Mbps

-75

dBm

HT20, MCS0

-93

dBm

HT20, MCS7

-73

dBm

HT40, MCS0

-90

dBm

HT40, MCS7

-70

dBm

MCS32

-91

dBm

Adjacent Channel Rejection

OFDM, 6 Mbps

OFDM, 54 Mbps

HT20, MCS0

HT20, MCS7

4.5 Bluetooth LE Radio

4.5.1 Receiver

Table 11: Receiver Characteristics - BLE

Parameter

Conditions

Min

Typ

Max

Unit

Sensitivity @0.1% BER

-98

dBm

Maximum received signal @0.1% BER

dBm

Co-channel C/I

+10

F = F0+1 MHz

-5

F = F0-1 MHz

-5

Adjacent channel selectivity C/I

F = F0 + 2 MHz

-2 5

F = F0-2 MHz

- 35

F = F0 + 3 MHz

-25

F = F0-3 MHz

-45

30 MHz - 2000 MHz

-10

dBm

Out-of-band blocking performance

2000 MHz - 2400 MHz

-27

dBm

2500 MHz - 3000 MHz

-27

dBm

3000 MHz-12.5GHz

-10

dBm

Intermodulation

-36

dBm

ESP-32S User Manual

Shenzhen Ai-Thinker Technology Co., Ltd http://www.ai-thinker.com

4.5.2 Transmit

Table 12: Transmit Characteristics – BLE

Parameter

Conditions

Min

Typ

Max

Unit

RF transmit power

+7.5

+10

dBm

RF power control range

Adjacent channel transmit power

F=F0+1 MHz

-14.6

dBm

F=F0-1 MHz

-12.7

dBm

F=F0 + 2 MHz

-44.3

dBm

F=F0-2 MHz

-38.7

dBm

F=F0 + 3 MHz

-49.2

dBm

F=F0-3 MHz

-44.7

dBm

F=F0+>3 MHz

-50

dBm

F=F0->3 MHz

-50

dBm

△f1avg

265

kHz

A f2

247

kHz

△f2avg/△f1avg

-0.92

ICFT

-10

kHz

Drift rate

0.7

kHz/50 µs

Drift

kHz

4.6 Reflow Profile

Table 13: Reflow Profile

Item

Value

Ts max to TL (Ramp-up Rate)

3°C/second max

Preheat

Temperature Min. (Ts Min.)

Temperature Typ. (Ts Typ.)

Temperature Min. (Ts Max.)

Time (Ts)

150°C

175°C

200°C

60 ~180 seconds

Ramp-up rate (TL to Tp)

3°C/second max

Time maintained above: -Temperature (TL)/Time (TL)

217°C/60 ~150 seconds

Peak temperature (Tp)

260°C max, for 10 seconds

Target peak temperature (Tp Target)

260°C +0/-5°C

Time within 5°C of actual peak (tp)

20~40 seconds

Ts max to TL(Ramp-down Rate)

6°C/second max

Tune25°C to Peak Temperature (t)

8 minutes max

ESP-32S User Manual

Shenzhen Ai-Thinker Technology Co., Ltd http://www.ai-thinker.com

5. Schematics

Figure 3: ESP-32S Schematics

Note:

The capacitance of Gland C2 varies with the selection of the crystal.

Ai Thinker Technology ESP32S Wi-Fi & Bluetooth Module User Manual ESP 32S

Shenzhen Ai-Thinker Technology co., LTD Wi-Fi & Bluetooth Module ESP 32S

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