ESP32-PICO-D4

Part: ESP32-PICO-D4 — Espressif Systems

Type: Wi-Fi + Bluetooth + Bluetooth LE System-in-Package (SiP)

Description: Dual-core 32-bit Xtensa LX6 SiP at up to 240 MHz with 802.11b/g/n Wi-Fi, Bluetooth v4.2 BR/EDR and Bluetooth LE, 4 MB in-package flash, 520 KB SRAM and up to 34 GPIOs in a 7.0 x 7.0 x 0.94 mm package.

Operating Conditions:

• Supply voltage: 3.0–3.6 V
• Operating ambient temperature: -40 to 85 °C
• CPU clock: up to 240 MHz

Absolute Maximum Ratings:

• Max supply voltage (VDDA, VDD3P3, VDD3P3_RTC, VDD3P3_CPU, VDD_SDIO): 3.6 V (min -0.3 V)
• Cumulative IO output current: 1100 mA
• Storage temperature: -40 to 85 °C

Key Specs:

• CPU: Xtensa dual-core 32-bit LX6, up to 240 MHz
• Memory: 448 KB ROM, 520 KB SRAM, 16 KB RTC SRAM
• In-package flash: 4 MB (Quad SPI), more than 100,000 program/erase cycles, more than 20 years data retention
• Wi-Fi: 802.11b/g/n, 1T1R, data rate up to 150 Mbps, 2412–2484 MHz
• Bluetooth: v4.2 BR/EDR and Bluetooth LE, Class-1/2/3 transmitter
• GPIOs: up to 34 (5 strapping, 6 used for in-package flash, 6 input-only)
• Chip revision: v1.0/v1.1

Features:

• Integrates crystal oscillator, filter capacitors, SPI flash and RF matching circuit in a single package
• TX/RX A-MPDU and RX A-MSDU aggregation, 0.4 μs guard interval
• Adaptive Frequency Hopping (AFH), CVSD and SBC audio codecs
• Peripherals: SD/SDIO/MMC host, UART, SPI, SDIO/SPI slave, I2C, LED PWM, Motor PWM, I2S, IR remote, pulse counter, capacitive touch, ADC, DAC, Ethernet MAC, TWAI (CAN 2.0)
• Status: Not Recommended for New Designs (NRND)

Applications:

• Smart home
• Industrial automation
• Health care
• Consumer electronics
• Smart agriculture
• POS machines
• Service robots
• Audio devices
• Low-power IoT sensor hubs and data loggers
• Video streaming cameras
• Speech and image recognition
• SDIO Wi-Fi + Bluetooth networking card

Package:

• SiP, 7.0 x 7.0 x 0.94 mm (ESP32-PICO-D4)

• Programmable data transfer length, in multiples of 1 byte

• Four-line full-duplex/half-duplex communication and three-line half-duplex communication support

• Master mode and slave mode

• Programmable CPOL and CPHA

• Programmable clock

For details, see ESP32 Technical Reference Manual > Chapter SPI Controller .

For SPI, the pins are multiplexed with GPIO6 ~ GPIO11 via the IO MUX. For HSPI, the pins are multiplexed with GPIO2, GPIO4, GPIO12 ~ GPIO15 via the IO MUX. For VSPI, the pins are multiplexed with GPIO5, GPIO18 ~ GPIO19, GPIO21 ~ GPIO23 via the IO MUX.

For more information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix .

With low power consumption, ESP32-PICO is an ideal choice for IoT devices in the following areas:

• Smart Home
• Industrial Automation
• Health Care
• Consumer Electronics
• Smart Agriculture
• POS Machines
• Service Robot
• Audio Devices
• Generic Low-power IoT Sensor Hubs
• Generic Low-power IoT Data Loggers
• Cameras for Video Streaming
• Speech Recognition
• Image Recognition
• SDIO Wi-Fi + Bluetooth Networking Card

Check the link or the QR code to make sure that you use the latest version of this document:

https://espressif.com/sites/default/files/documentation/esp32-pico_series_datasheet_en.pdf

1. some pin functions are highlighted, specically:

• GPIO -Input only pins , output is not supported due to lack of pull-up/pull-down resistors.
• The highlighted cells indicate pins that are connected to the in-package flash. For details see Section 2.1.3 Pin Mapping Between ESP32-PICO-D4 and Flash/PSRAM.
• GPIO - have one of the following important functions:
• Strapping pins - need to be at certain logic levels at startup. See Section 3 Boot Configurations .
• JTAG interface - often used for debugging.
• UART interface - often used for debugging.

1. For definition of functions in column Function , see Section 2.3 Pin Function Description.
2. Type : I/O - Input/Output; I - Input.

Table 2: Pin Description of ESP32-PICO-D4

Name	No.	Type	Function
Analog	Analog	Analog	Analog
VDDA	1	Power	Analog power supply
LNA_IN	2	I/O	RF input and output
VDDA3P3	3	Power	Analog power supply
VDDA3P3	4	Power	Analog power supply
VDD3P3_RTC	VDD3P3_RTC	VDD3P3_RTC	VDD3P3_RTC
SENSOR_VP	5	I	GPIO36, ADC1_CH0, RTC_GPIO0
SENSOR_CAPP	6	I	GPIO37 , ADC1_CH1, RTC_GPIO1
SENSOR_CAPN	7	I	GPIO38, ADC1_CH2, RTC_GPIO2
SENSOR_VN	8	I	GPIO39, ADC1_CH3, RTC_GPIO3

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Table 2 - cont'd from previous page

Name	No.	Type	Function	Function	Function	Function	Function	Function	Function
EN	9	I	High: On; enables the SiP Low: Off; the SiP shuts down Note: Do not leave this pin floating.	High: On; enables the SiP Low: Off; the SiP shuts down Note: Do not leave this pin floating.	High: On; enables the SiP Low: Off; the SiP shuts down Note: Do not leave this pin floating.	High: On; enables the SiP Low: Off; the SiP shuts down Note: Do not leave this pin floating.	High: On; enables the SiP Low: Off; the SiP shuts down Note: Do not leave this pin floating.	High: On; enables the SiP Low: Off; the SiP shuts down Note: Do not leave this pin floating.	High: On; enables the SiP Low: Off; the SiP shuts down Note: Do not leave this pin floating.
IO34	10	I	GPIO34,	ADC1_CH6, RTC_GPIO4	ADC1_CH6, RTC_GPIO4	ADC1_CH6, RTC_GPIO4	ADC1_CH6, RTC_GPIO4	ADC1_CH6, RTC_GPIO4	ADC1_CH6, RTC_GPIO4
IO35	11	I	GPIO35,	ADC1_CH7, RTC_GPIO5	ADC1_CH7, RTC_GPIO5	ADC1_CH7, RTC_GPIO5	ADC1_CH7, RTC_GPIO5	ADC1_CH7, RTC_GPIO5	ADC1_CH7, RTC_GPIO5
IO32	12	I/O	ADC1_CH4,TOUCH9,	ADC1_CH4,TOUCH9,	RTC_GPIO9,32K_XP (32.768 kHz crystal oscillator input)	RTC_GPIO9,32K_XP (32.768 kHz crystal oscillator input)	RTC_GPIO9,32K_XP (32.768 kHz crystal oscillator input)	RTC_GPIO9,32K_XP (32.768 kHz crystal oscillator input)	RTC_GPIO9,32K_XP (32.768 kHz crystal oscillator input)
IO33	13	I/O	GPIO33,	ADC1_CH5, TOUCH8, RTC_GPIO8, 32K_XN (32.768 kHz crystal oscillator output)	ADC1_CH5, TOUCH8, RTC_GPIO8, 32K_XN (32.768 kHz crystal oscillator output)	ADC1_CH5, TOUCH8, RTC_GPIO8, 32K_XN (32.768 kHz crystal oscillator output)	ADC1_CH5, TOUCH8, RTC_GPIO8, 32K_XN (32.768 kHz crystal oscillator output)	ADC1_CH5, TOUCH8, RTC_GPIO8, 32K_XN (32.768 kHz crystal oscillator output)	ADC1_CH5, TOUCH8, RTC_GPIO8, 32K_XN (32.768 kHz crystal oscillator output)
IO25	14	I/O	GPIO25,	DAC_1, ADC2_CH8,RTC_GPIO6, EMAC_RXD0	DAC_1, ADC2_CH8,RTC_GPIO6, EMAC_RXD0	DAC_1, ADC2_CH8,RTC_GPIO6, EMAC_RXD0	DAC_1, ADC2_CH8,RTC_GPIO6, EMAC_RXD0	DAC_1, ADC2_CH8,RTC_GPIO6, EMAC_RXD0	DAC_1, ADC2_CH8,RTC_GPIO6, EMAC_RXD0
IO26	15	I/O	GPIO26,	DAC_2, ADC2_CH9,RTC_GPIO7 , EMAC_RXD1	DAC_2, ADC2_CH9,RTC_GPIO7 , EMAC_RXD1	DAC_2, ADC2_CH9,RTC_GPIO7 , EMAC_RXD1	DAC_2, ADC2_CH9,RTC_GPIO7 , EMAC_RXD1	DAC_2, ADC2_CH9,RTC_GPIO7 , EMAC_RXD1	DAC_2, ADC2_CH9,RTC_GPIO7 , EMAC_RXD1
IO27	16	I/O	GPIO27 ,	ADC2_CH7, TOUCH7, RTC_GPIO17 ,	ADC2_CH7, TOUCH7, RTC_GPIO17 ,	EMAC_RX_DV	EMAC_RX_DV	EMAC_RX_DV	EMAC_RX_DV
IO14	17	I/O	GPIO14,	ADC2_CH6,TOUCH6, RTC_GPIO16,HSPICLK,	ADC2_CH6,TOUCH6, RTC_GPIO16,HSPICLK,	HS2_CLK,	SD_CLK,	MTMS,	EMAC_TXD2
IO12	18	I/O	GPIO12,	ADC2_CH5,TOUCH5, RTC_GPIO15,HSPIQ,	ADC2_CH5,TOUCH5, RTC_GPIO15,HSPIQ,	HS2_DATA2,	SD_DATA2,	MTDI,	EMAC_TXD3
VDD3P3_RTC	19	Power	Input power supply for RTC IO	Input power supply for RTC IO	Input power supply for RTC IO	Input power supply for RTC IO	Input power supply for RTC IO	Input power supply for RTC IO	Input power supply for RTC IO
IO13	20	I/O	GPIO13,	ADC2_CH4,TOUCH4, RTC_GPIO14,HSPID,	ADC2_CH4,TOUCH4, RTC_GPIO14,HSPID,	HS2_DATA3,	SD_DATA3,	MTCK,	EMAC_RX_ER
IO15	21	I/O	GPIO15,	ADC2_CH3,TOUCH3, RTC_GPIO13,HSPICS0,	ADC2_CH3,TOUCH3, RTC_GPIO13,HSPICS0,	HS2_CMD,	SD_CMD,	MTDO,	EMAC_RXD3
IO2	22	I/O	GPIO2,	ADC2_CH2,TOUCH2, RTC_GPIO12,HSPIWP,	ADC2_CH2,TOUCH2, RTC_GPIO12,HSPIWP,	HS2_DATA0,	SD_DATA0
IO0	23	I/O	GPIO0,	ADC2_CH1, TOUCH1, RTC_GPIO11,	ADC2_CH1, TOUCH1, RTC_GPIO11,	CLK_OUT1,EMAC_TX_CLK	CLK_OUT1,EMAC_TX_CLK	CLK_OUT1,EMAC_TX_CLK	CLK_OUT1,EMAC_TX_CLK
IO4	24	I/O	GPIO4,	ADC2_CH0,TOUCH0, RTC_GPIO10,HSPIHD,	ADC2_CH0,TOUCH0, RTC_GPIO10,HSPIHD,	HS2_DATA1,	SD_DATA1,	EMAC_TX_ER	EMAC_TX_ER
VDD_SDIO	VDD_SDIO	VDD_SDIO	VDD_SDIO	VDD_SDIO	VDD_SDIO	VDD_SDIO	VDD_SDIO	VDD_SDIO	VDD_SDIO
IO16	25	I/O	GPIO16,	HS1_DATA4,U2RXD, EMAC_CLK_OUT	HS1_DATA4,U2RXD, EMAC_CLK_OUT	HS1_DATA4,U2RXD, EMAC_CLK_OUT	HS1_DATA4,U2RXD, EMAC_CLK_OUT	HS1_DATA4,U2RXD, EMAC_CLK_OUT	HS1_DATA4,U2RXD, EMAC_CLK_OUT
VDD_SDIO	26	Power	Output power supply	Output power supply	Output power supply	Output power supply	Output power supply	Output power supply	Output power supply
IO17	27	I/O	GPIO17 ,	HS1_DATA5,U2TXD, EMAC_CLK_OUT_180	HS1_DATA5,U2TXD, EMAC_CLK_OUT_180	HS1_DATA5,U2TXD, EMAC_CLK_OUT_180	HS1_DATA5,U2TXD, EMAC_CLK_OUT_180	HS1_DATA5,U2TXD, EMAC_CLK_OUT_180	HS1_DATA5,U2TXD, EMAC_CLK_OUT_180
SD2	28	I/O	GPIO9,	SD_DATA2, SPIHD, HS1_DATA2, U1RXD	SD_DATA2, SPIHD, HS1_DATA2, U1RXD	SD_DATA2, SPIHD, HS1_DATA2, U1RXD	SD_DATA2, SPIHD, HS1_DATA2, U1RXD	SD_DATA2, SPIHD, HS1_DATA2, U1RXD	SD_DATA2, SPIHD, HS1_DATA2, U1RXD
SD3	29	I/O	GPIO10,	SD_DATA3, SPIWP,	HS1_DATA3, U1TXD	HS1_DATA3, U1TXD	HS1_DATA3, U1TXD	HS1_DATA3, U1TXD	HS1_DATA3, U1TXD
CMD	30	I/O	GPIO11,	SD_CMD, SPICS0,	HS1_CMD, U1RTS	HS1_CMD, U1RTS	HS1_CMD, U1RTS	HS1_CMD, U1RTS	HS1_CMD, U1RTS
CLK	31	I/O	GPIO6,	SD_CLK, SPICLK,	HS1_CLK, U1CTS	HS1_CLK, U1CTS	HS1_CLK, U1CTS	HS1_CLK, U1CTS	HS1_CLK, U1CTS
SD0	32	I/O	GPIO7 ,	SD_DATA0, SPIQ,	HS1_DATA0, U2RTS	HS1_DATA0, U2RTS	HS1_DATA0, U2RTS	HS1_DATA0, U2RTS	HS1_DATA0, U2RTS

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Table 2 - cont'd from previous page

Name	No.	Type	Function
SD1	33	I/O	GPIO8, SD_DATA1, SPID, HS1_DATA1, U2CTS
VDD3P3_CPU	VDD3P3_CPU	VDD3P3_CPU	VDD3P3_CPU
IO5	34	I/O GPIO5,	VSPICS0, HS1_DATA6,EMAC_RX_CLK
IO18	35	I/O	GPIO18, VSPICLK, HS1_DATA7
IO23	36	I/O	GPIO23, VSPID, HS1_STROBE
VDD3P3_CPU	37	Power Input	power supply for CPU IO
IO19	38	I/O GPIO19,	VSPIQ, U0CTS, EMAC_TXD0
IO22	39	I/O GPIO22,	VSPIWP, U0RTS, EMAC_TXD1
U0RXD	40	I/O GPIO3,	U0RXD, CLK_OUT2
U0TXD	41	I/O GPIO1,	U0TXD, CLK_OUT3,EMAC_RXD2
IO21	42	I/O	GPIO21, VSPIHD, EMAC_TX_EN
Analog	Analog	Analog	Analog
VDDA	43	Power	Analog power supply
XTAL_N_NC	44	-	NC (No connection. Please refer to Schematics)
XTAL_P_NC	45	-	NC (No connection. Please refer to Schematics)
VDDA	46	Power	Analog power supply
CAP2_NC	47	-	NC (No connection. Please refer to Schematics)
CAP1_NC	48	-	NC (No connection. Please refer to Schematics)

Table 18: DC Characteristics (3.3 V, 25 °C)

Symbol	Parameter		Min Typ	Max	Unit
C IN	Pin capacitance	Pin capacitance	-	2	-	pF
V IH	High-level input voltage	High-level input voltage	0.75 × VDD 1	-	VDD 1 + 0.3	V
V IL	Low-level input voltage	Low-level input voltage	-0.3	-	0.25 × VDD 1	V
I IH	High-level input current	High-level input current	-	-	50	nA
I IL	Low-level input current	Low-level input current	-	-	50	nA
V OH 4	High-level output voltage	High-level output voltage	0.8 × VDD 1	-	-	V
V OL 4	Low-level output voltage	Low-level output voltage	-	-	0.1 × VDD 1	V
I OH	High-level source current (VDD 1 = 3.3 V, V OH >= 2.64 V, output drive strength set	VDD3P3_CPU power domain 1, 2	-	40	-	mA
I OH	to the maximum)	VDD3P3_RTC power domain 1, 2	-	40	-	mA
I OH	High-level source current (VDD 1 = 3.3 V, V OH >= 2.64 V, output drive strength set	VDD_SDIO power domain 1, 3	-	20	-	mA
I OL	Low-level sink current (VDD 1 = 3.3 V, V OL = 0.495 V, output drive strength set to the maximum)	Low-level sink current (VDD 1 = 3.3 V, V OL = 0.495 V, output drive strength set to the maximum)	-	28	-	mA
R PU	Resistance of internal pull-up resistor	Resistance of internal pull-up resistor	-	45	-	k Ω
R PD	Resistance of internal pull-down resistor	Resistance of internal pull-down resistor	-	45	-	k Ω
V IH _ nRST	Chip reset release voltage (CHIP_PU voltage is within the specified range)	Chip reset release voltage (CHIP_PU voltage is within the specified range)	0.75 × VDD 1	-	VDD 1 + 0.3	V
V IL _ nRST	Low-level input voltage of CHIP_PU to power off the chip	Low-level input voltage of CHIP_PU to power off the chip	-	-	0.6	V

Stresses above those listed in T able 16 Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and normal operation of the device at these or any other conditions beyond those indicated in Section 5.2 Recommended Power Supply Characteristics is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Table 16: Absolute Maximum Ratings

Parameter	Description	Min	Max	Unit
VDDA, VDD3P3, VDD3P3_RTC, VDD3P3_CPU, VDD_SDIO 1	Allowed input voltage	-0.3	3.6	V
I output 2	Cumulative IO output current	-	1100	mA
T STORE	Storage temperature	-40	85	°C

This section provides the following resources for your reference:

• Figures for recommended PCB land patterns with all the dimensions needed for PCB design. See Figure 16 ESP32-PICO PCB Land Pattern .
• Source files of recommended PCB land patterns to measure dimensions not covered in Figure 16. You can view the source files for ESP32-PICO-D4, ESP32-PICO-V3, and ESP2-PICO-V3-02 with Autodesk Viewer.

Figure 16: ESP32-PICO PCB Land Pattern