RP2040 (QFN-56 (7×7 mm)) Pinout Diagram

Raspberry Pi's RP2040 is a dual-core 133 MHz ARM Cortex-M0+ MCU integrating 264 KB of six-bank multi-port SRAM, an execute-in-place (XIP) QSPI flash bus with 16 KB cache, an internal 1.1 V core LDO, and a full-speed USB 1.1 PHY with ROM UF2 bootloader in a compact 7×7 mm QFN-56 package. Two Programmable I/O (PIO) blocks supply 8 cycle-accurate state machines for custom high-speed interfaces alongside flexible crossbar muxing for 2× UART, 2× SPI, 2× I2C, and 16 PWM channels across 30 3.3 V GPIOs. Four 12-bit 500 ksps SAR ADC inputs (GPIO26–GPIO29) handle analog acquisition. GPIO0–GPIO25 are fail-safe 3.3 V digital pads (strictly non-5V-tolerant), whereas GPIO26–GPIO29 incorporate ESD protection clamp diodes to IOVDD.

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Full Pin Reference (57 Pins)

Pin #	Label	Type	Functions	Warnings & Notes
1	IOVDD	power	3V3_IO IOVDD	Digital I/O supply (1.8V–3.3V nominal)
2	GPIO0	digital	GPIO0 SPI0_RX UART0_TX I2C0_SDA PWM0_A PIO0 PIO1 USB_OVCUR_DET	RP2040 General Purpose I/O pin 0
3	GPIO1	digital	GPIO1 SPI0_CSn UART0_RX I2C0_SCL PWM0_B PIO0 PIO1 USB_VBUS_DET	RP2040 General Purpose I/O pin 1
4	GPIO2	digital	GPIO2 SPI0_SCK UART0_CTS I2C1_SDA PWM1_A PIO0 PIO1 USB_VBUS_EN	RP2040 General Purpose I/O pin 2
5	GPIO3	digital	GPIO3 SPI0_TX UART0_RTS I2C1_SCL PWM1_B PIO0 PIO1 USB_OVCUR_DET	RP2040 General Purpose I/O pin 3
6	GPIO4	digital	GPIO4 SPI0_RX UART1_TX I2C0_SDA PWM2_A PIO0 PIO1 USB_VBUS_DET	RP2040 General Purpose I/O pin 4
7	GPIO5	digital	GPIO5 SPI0_CSn UART1_RX I2C0_SCL PWM2_B PIO0 PIO1 USB_VBUS_EN	RP2040 General Purpose I/O pin 5
8	GPIO6	digital	GPIO6 SPI0_SCK UART1_CTS I2C1_SDA PWM3_A PIO0 PIO1 USB_OVCUR_DET	RP2040 General Purpose I/O pin 6
9	GPIO7	digital	GPIO7 SPI0_TX UART1_RTS I2C1_SCL PWM3_B PIO0 PIO1 USB_VBUS_DET	RP2040 General Purpose I/O pin 7
10	IOVDD	power	3V3_IO IOVDD	Digital I/O supply (1.8V–3.3V nominal)
11	GPIO8	digital	GPIO8 SPI1_RX UART1_TX I2C0_SDA PWM4_A PIO0 PIO1 USB_VBUS_EN	RP2040 General Purpose I/O pin 8
12	GPIO9	digital	GPIO9 SPI1_CSn UART1_RX I2C0_SCL PWM4_B PIO0 PIO1 USB_OVCUR_DET	RP2040 General Purpose I/O pin 9
13	GPIO10	digital	GPIO10 SPI1_SCK UART1_CTS I2C1_SDA PWM5_A PIO0 PIO1 USB_VBUS_DET	RP2040 General Purpose I/O pin 10
14	GPIO11	digital	GPIO11 SPI1_TX UART1_RTS I2C1_SCL PWM5_B PIO0 PIO1 USB_VBUS_EN	RP2040 General Purpose I/O pin 11
15	GPIO12	digital	GPIO12 SPI1_RX UART0_TX I2C0_SDA PWM6_A PIO0 PIO1 USB_OVCUR_DET	RP2040 General Purpose I/O pin 12
16	GPIO13	digital	GPIO13 SPI1_CSn UART0_RX I2C0_SCL PWM6_B PIO0 PIO1 USB_VBUS_DET	RP2040 General Purpose I/O pin 13
17	GPIO14	digital	GPIO14 SPI1_SCK UART0_CTS I2C1_SDA PWM7_A PIO0 PIO1 USB_VBUS_EN	RP2040 General Purpose I/O pin 14
18	GPIO15	digital	GPIO15 SPI1_TX UART0_RTS I2C1_SCL PWM7_B PIO0 PIO1 USB_OVCUR_DET	RP2040 General Purpose I/O pin 15
19	TESTEN	special	TESTEN	[DANGER] Factory test pin — MUST tie directly to GND Leaving TESTEN floating or HIGH enters factory test mode and prevents booting. Factory test enable pin
20	XIN	clock	XIN	[INFO] 12MHz crystal input or 1.8V–3.3V CMOS clock input 12MHz crystal input or 1.8V–3.3V CMOS clock input Crystal oscillator input
21	XOUT	clock	XOUT	[INFO] 12MHz crystal output (add 1kΩ series damping resistor for typical SMD crystals) 12MHz crystal output (add 1kΩ series damping resistor for typical SMD crystals) Crystal oscillator output
22	IOVDD	power	3V3_IO IOVDD	Digital I/O supply (1.8V–3.3V nominal)
23	DVDD	power	1V1_CORE DVDD	[INFO] 1.1V core logic supply 1.1V core logic supply — decouple with 100nF close to pin 1.1V core logic supply
24	SWCLK	digital	SWCLK	[INFO] Dedicated ARM SWD debug pin Serial Wire Debug interface pin (SWCLK/SWDIO). Keep reserved when using an external debug probe. ARM Serial Wire Debug Clock
25	SWDIO	digital	SWDIO	[INFO] Dedicated ARM SWD debug pin Serial Wire Debug interface pin (SWCLK/SWDIO). Keep reserved when using an external debug probe. ARM Serial Wire Debug Data I/O
26	RUN	reset	RUN	[INFO] Active-low hardware reset (pull LOW to reset RP2040) Active-low hardware reset (pull LOW to reset RP2040) Active-low hardware reset
27	GPIO16	digital	GPIO16 SPI0_RX UART0_TX I2C0_SDA PWM0_A PIO0 PIO1 USB_VBUS_DET	RP2040 General Purpose I/O pin 16
28	GPIO17	digital	GPIO17 SPI0_CSn UART0_RX I2C0_SCL PWM0_B PIO0 PIO1 USB_VBUS_EN	RP2040 General Purpose I/O pin 17
29	GPIO18	digital	GPIO18 SPI0_SCK UART0_CTS I2C1_SDA PWM1_A PIO0 PIO1 USB_OVCUR_DET	RP2040 General Purpose I/O pin 18
30	GPIO19	digital	GPIO19 SPI0_TX UART0_RTS I2C1_SCL PWM1_B PIO0 PIO1 USB_VBUS_DET	RP2040 General Purpose I/O pin 19
31	GPIO20	digital	GPIO20 SPI0_RX UART1_TX I2C0_SDA PWM2_A PIO0 PIO1 CLOCK_GPIN0 USB_VBUS_EN	RP2040 General Purpose I/O pin 20
32	GPIO21	digital	GPIO21 SPI0_CSn UART1_RX I2C0_SCL PWM2_B PIO0 PIO1 CLOCK_GPOUT0 USB_OVCUR_DET	RP2040 General Purpose I/O pin 21
33	IOVDD	power	3V3_IO IOVDD	Digital I/O supply (1.8V–3.3V nominal)
34	GPIO22	digital	GPIO22 SPI0_SCK UART1_CTS I2C1_SDA PWM3_A PIO0 PIO1 CLOCK_GPIN1 USB_VBUS_DET	RP2040 General Purpose I/O pin 22
35	GPIO23	digital	GPIO23 SPI0_TX UART1_RTS I2C1_SCL PWM3_B PIO0 PIO1 CLOCK_GPOUT1 USB_VBUS_EN	RP2040 General Purpose I/O pin 23
36	GPIO24	digital	GPIO24 SPI1_RX UART1_TX I2C0_SDA PWM4_A PIO0 PIO1 CLOCK_GPOUT2 USB_OVCUR_DET	RP2040 General Purpose I/O pin 24
37	GPIO25	digital	GPIO25 SPI1_CSn UART1_RX I2C0_SCL PWM4_B PIO0 PIO1 CLOCK_GPOUT3 USB_VBUS_DET	RP2040 General Purpose I/O pin 25
38	GPIO26	mixed	ADC0 GPIO26 SPI1_SCK UART1_CTS I2C1_SDA PWM5_A PIO0 PIO1 USB_VBUS_EN	[CAUTION] ADC ESD diode to IOVDD & RP2040-E6 input leakage Unlike GPIO0–25, GPIO26–29 have clamp diodes to IOVDD (do not drive while unpowered). Disable digital input buffer in firmware when sampling ADC (errata RP2040-E6). Strictly 3.3V max. RP2040 ADC input 0 / GPIO26
39	GPIO27	mixed	ADC1 GPIO27 SPI1_TX UART1_RTS I2C1_SCL PWM5_B PIO0 PIO1 USB_OVCUR_DET	[CAUTION] ADC ESD diode to IOVDD & RP2040-E6 input leakage Unlike GPIO0–25, GPIO26–29 have clamp diodes to IOVDD (do not drive while unpowered). Disable digital input buffer in firmware when sampling ADC (errata RP2040-E6). Strictly 3.3V max. RP2040 ADC input 1 / GPIO27
40	GPIO28	mixed	ADC2 GPIO28 SPI1_RX UART0_TX I2C0_SDA PWM6_A PIO0 PIO1 USB_VBUS_DET	[CAUTION] ADC ESD diode to IOVDD & RP2040-E6 input leakage Unlike GPIO0–25, GPIO26–29 have clamp diodes to IOVDD (do not drive while unpowered). Disable digital input buffer in firmware when sampling ADC (errata RP2040-E6). Strictly 3.3V max. RP2040 ADC input 2 / GPIO28
41	GPIO29	mixed	ADC3 GPIO29 SPI1_CSn UART0_RX I2C0_SCL PWM6_B PIO0 PIO1 USB_VBUS_EN	[CAUTION] ADC ESD diode to IOVDD & RP2040-E6 input leakage Unlike GPIO0–25, GPIO26–29 have clamp diodes to IOVDD (do not drive while unpowered). Disable digital input buffer in firmware when sampling ADC (errata RP2040-E6). Strictly 3.3V max. RP2040 ADC input 3 / GPIO29
42	IOVDD	power	3V3_IO IOVDD	Digital I/O supply (1.8V–3.3V nominal)
43	ADC_AVDD	power	ADC_AVDD	ADC analog reference & supply (3.3V nominal)
44	VREG_IN	power	VREG_IN	Internal 1.1V core regulator input (1.8V–3.3V, 1µF cap to GND)
45	VREG_VOUT	power	VREG_VOUT_1V1	[CAUTION] 1.1V regulator output capacitor requirement 1.1V regulator output — requires 1µF capacitor to GND; connect to DVDD 1.1V regulator output — requires 1µF capacitor to GND; connect to DVDD
46	USB_DM	special	USB_DM	[CAUTION] Requires external 27Ω series termination resistor External 27Ω resistor required in series with USB D- pin to meet USB full-speed termination impedance. USB full-speed differential D- signal
47	USB_DP	special	USB_DP	[CAUTION] Requires external 27Ω series termination resistor External 27Ω resistor required in series with USB D+ pin to meet USB full-speed termination impedance. USB full-speed differential D+ signal
48	USB_VDD	power	USB_VDD_3V3	USB PHY 3.3V supply
49	IOVDD	power	3V3_IO IOVDD	Digital I/O supply (1.8V–3.3V nominal)
50	DVDD	power	1V1_CORE DVDD	[INFO] 1.1V core logic supply 1.1V core logic supply — decouple with 100nF close to pin 1.1V core logic supply
51	QSPI_SD3	digital	QSPI_SD3	[CAUTION] Dedicated external XIP QSPI flash bus Dedicated external XIP QSPI flash bus — cannot be repurposed for user peripherals. Dedicated QSPI flash interface signal QSPI_SD3
52	QSPI_SCLK	digital	QSPI_SCLK	[CAUTION] Dedicated external XIP QSPI flash bus Dedicated external XIP QSPI flash bus — cannot be repurposed for user peripherals. Dedicated QSPI flash interface signal QSPI_SCLK
53	QSPI_SD0	digital	QSPI_SD0	[CAUTION] Dedicated external XIP QSPI flash bus Dedicated external XIP QSPI flash bus — cannot be repurposed for user peripherals. Dedicated QSPI flash interface signal QSPI_SD0
54	QSPI_SD2	digital	QSPI_SD2	[CAUTION] Dedicated external XIP QSPI flash bus Dedicated external XIP QSPI flash bus — cannot be repurposed for user peripherals. Dedicated QSPI flash interface signal QSPI_SD2
55	QSPI_SD1	digital	QSPI_SD1	[CAUTION] Dedicated external XIP QSPI flash bus Dedicated external XIP QSPI flash bus — cannot be repurposed for user peripherals. Dedicated QSPI flash interface signal QSPI_SD1
56	QSPI_SS	digital	QSPI_SS	[CAUTION] Boot strapping pin (BOOTSEL) & QSPI Flash CS# Sampled at reset: pulling QSPI_SS LOW forces USB UF2 bootloader mode instead of booting from QSPI flash. QSPI Flash Chip Select / Boot strapping pin (BOOTSEL)
57	GND	ground	GND	Central exposed thermal & electrical ground pad