GPIO interface

Access the nRF54LM20B SoC GPIOs through headers P1, P2, P3, P4, P5, and P17. Each GPIO pin header has a dedicated power header (P6, P7, P8, P9, P10, and P18) that can supply 5 V to any external device connected to the DK.

The expansion board header at P17 supports the addition of future generic expansion boards for Nordic DKs. The GPIO pins in the expansion board header are also available at headers P1–P5.

Figure 1. GPIO and power headers

Pin maps

Table 1. P0 pin map

GPIO pin	Function	Available on the expansion board header	Default connected to P1
P0.00			Yes
P0.01			Yes
P0.02			Yes
P0.03		Yes	Yes
P0.04		Yes	Yes
P0.05	BUTTON 3		Yes
P0.06	UART0_TXD		Yes
P0.07	UART0_RXD		Yes
P0.08	UART0_RST		Yes
P0.09	UART0_CST		Yes

Table 2. P1 pin map

GPIO pin	Function	Available on the expansion board header	Default connected to P2
P1.00			Yes.
P1.01	NFC1		Yes. Can be disconnected by removing R33.
P1.02	NFC2	Yes	Yes. Can be disconnected by removing R34.
P1.03		Yes	Yes.
P1.04		Yes	Yes.
P1.05		Yes	Yes.
P1.06		Yes	Yes.
P1.07		Yes	Yes.
P1.08	BUTTON 2		Yes.
P1.09	BUTTON 1		Yes.
P1.10			Yes.
P1.11			Yes.
P1.12			Yes.
P1.13		Yes	Yes.
P1.14			Yes.
P1.15			Yes.
P1.16	UART1_TXD		Yes.

Table 3. P1 pin map

GPIO pin	Function	Available on the expansion board header	Default connected to P3
P1.17	UART1_RXD		Yes.
P1.18	UART1_RST		Yes.
P1.19	UART1_CTS		Yes.
P1.20	32.768 kHz, XL1		No. Solder bridges must be configured. Short SB3 to connect the GPIO to the pin header.
P1.21	32.768 kHz, XL2		No. Solder bridges must be configured. Short SB4 to connect the GPIO to the pin header.
P1.22	LED 0		Yes.
P1.23			Yes.
P1.24			Yes.
P1.25	LED 1		Yes.
P1.26	Button 0		Yes.
P1.27	LED 2		Yes.
P1.28	LED 3		Yes.
P1.29			Yes.
P1.30			Yes.
P1.31	LED 3		Yes.

Table 4. P2 pin map

GPIO pin	Function	Available on the expansion board header	Default connected to P4
P2.00	QSPI_IO3/External flash	Yes	No
P2.01	QSPI_CLK/External flash	Yes	No
P2.02	SPI_IO0/External flash	Yes	No
P2.03	SPI_IO2/External flash	Yes	No
P2.04	SPI_IO1/External flash	Yes	No
P2.05	SPI_CS/External flash	Yes	No
P2.06	TRACECLK		Yes
P2.07	TRACEDATA[0]		Yes
P2.08	TRACEDATA[1]		Yes
P2.09	TRACEDATA[2]		Yes
P2.10	TRACEDATA[3]		Yes

Table 5. P3 pin map

GPIO pin	Function	Available on the expansion board header	Default connected to P5
P3.00		Yes	Yes
P3.01		Yes	Yes
P3.02		Yes	Yes
P3.03		Yes	Yes
P3.04		Yes	Yes
P3.05		Yes	Yes
P3.06		Yes	Yes
P3.07			Yes
P3.08			Yes
P3.09			Yes
P3.10			Yes
P3.11			Yes
P3.12			Yes

Headers P6, P7, P8, P9, P10, and P18 are power supply pins that each provide 5.0 V for shields connected to GPIO ports.

Table 6. P6, P7, P8, P9, P10, and P18 signal map

P6, P7, P8, P9, P10, and P18 signal	Function
1	5V0 from PMIC
2	Ground
3	N.C.
4	Ground

The following figure shows the expansion board header.

Figure 2. Expansion board header