Expansion Interface

The HackRF One expansion interface consists of headers P9, P20, P22, and P28. These four headers are installed on the commercial HackRF One from Great Scott Gadgets.

P9 Baseband

A direct analog interface to the high speed dual ADC and dual DAC.

Pin	Function
1	GND
2	GND
3	GND
4	RXBBQ-
5	RXBBI-
6	RXBBQ+
7	RXBBI+
8	GND
9	GND
10	TXBBI-
11	TXBBQ+
12	TXBBI+
13	TXBBQ-
14	GND
15	GND
16	GND

P20 GPIO

Providing access to GPIO, ADC, RTC, and power.

Pin	Function
1	VBAT
2	RTC_ALARM
3	VCC
4	WAKEUP
5	GPIO3_8
6	GPIO3_0
7	GPIO3_10
8	GPIO3_11
9	GPIO3_12
10	GPIO3_13
11	GPIO3_14
12	GPIO3_15
13	GND
14	ADC0_6
15	GND
16	ADC0_2
17	VBUSCTRL
18	ADC0_5
19	GND
20	ADC0_0
21	VBUS
22	VIN

P22 I2S

I2S, SPI, I2C, UART, GPIO, and clocks.

Pin	Function
1	CLKOUT
2	CLKIN
3	RESET
4	GND
5	I2C1_SCL
6	I2C1_SDA
7	SPIFI_MISO
8	SPIFI_SCK
9	SPIFI_MOSI
10	GND
11	VCC
12	I2S0_RX_SCK
13	I2S_RX_SDA
14	I2S0_RX_MCLK
15	I2S0_RX_WS
16	I2S0_TX_SCK
17	I2S0_TX_MCLK
18	GND
19	U0_RXD
20	U0_TXD
21	P2_9
22	P2_13
23	P2_8
24	SDA
25	CLK6
26	SCL

P28 SD

SDIO, GPIO, clocks, and CPLD.

Pin	Function
1	VCC
2	GND
3	SD_CD
4	SD_DAT3
5	SD_DAT2
6	SD_DAT1
7	SD_DAT0
8	SD_VOLT0
9	SD_CMD
10	SD_POW
11	SD_CLK
12	GND
13	GCK2
14	GCK1
15	B1AUX14 (trigger output)
16	B1AUX13 (trigger input)
17	CPLD_TCK
18	BANK2F3M2
19	CPLD_TDI
20	BANK2F3M6
21	BANK2F3M12
22	BANK2F3M4

Additional unpopulated headers and test points are available for test and development, but they may be incompatible with some enclosure or expansion options.

Refer to the schematics and component documentation for more information.