Acconeer XE121, User Manual, Page: 23 / 37

A121 EVK – User Guide
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2022-07-07 © 2022 by Acconeer – All rights
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Table 3 shows the pinout of XE121 connector to Raspberry Pi:
Table 3. The pinout of XE121 connector to Raspberry Pi.
Pin XE121 Raspberry Pi Description
1 +3V3 3V3
2 +5V 5V Power
3 I2C.SDA GPIO 2 (I2C1 SDA) Used for EEPROM on the XE121
4 +5V 5V Power
5 I2C.SCL GPIO 3 (I2C1 SCL) Used for EEPROM on the XE121
6 GND GND
7 SYNC GPIO 4 (GPCLK0) Signal for sensor synchronization
8 NC GPIO 14 (UART TX) Not used on XE121
9 GND GND
10 NC GPIO 15 (UART RX) Not used on XE121
11 SPI.SEL0 GPIO 17 SPI selection for LVDS enable and SPI SS
12 NC GPIO 18 (PCM CLK) Not used on XE121
13 SPI.SEL1 GPIO 27 SPI selection for LVDS enable and SPI SS
14 GND GND
15 SPI.SEL2 GPIO 22 SPI selection for LVDS enable and SPI SS
16 SEN_EN.5 GPIO23 XS121 sensor enable signal
17 +3V3 +3V3
18 SEN_EN.4 GPIO 24 XS121 sensor enable signal
19 SPI.MOSI.CON GPIO 10 (SPI0 MOSI) SPI interface for communication with sensor
on XE121 and XS121
20 GND GND
21 SPI.MISO.CON GPIO 9 (SPI0 MISO) SPI interface for communication with sensor
on XE121 and XS121
22 SEN_EN.3 GPIO 25 XS121 sensor enable signal
23 SPI.SCK.CON GPIO 11 (SPI0 SCK) SPI interface for communication with sensor
on XE121 and XS121
24 SPI.SS GPIO 8 (SPI0 CE0) SPI interface for communication with sensor
on XE121 and XS121
25 GND GND
26 NC GPIO 7 (SPIO0 CE1) Not used on XE121
27 NC GPIO 0 (EEPROM SDA) Not used on XE121
28 NC GPIO1 (EEPROM SCL) Not used on XE121
29 SEN_EN.1 GPIO 5 XE121 sensor enable signal
30 GND GND
31 SEN_INT.5 GPIO 6 XS121 sensor interrupt signal
32 SEN_INT.4 GPIO 12 (PWM0) XS121 sensor interrupt signal
33 SEN_INT.3 GPIO 13 (PWM1) XS121 sensor interrupt signal
34 GND GND
35 NC GPIO 19 (PCM FS) Not used on XE121
36 SEN_INT.2 GPIO 16 XS121 sensor interrupt signal
37 SEN_INT.1 GPIO 26 XE121 sensor Interrupt signal
38 SEN_EN.2 GPIO 20 (PCM DIN) XS121 sensor enable signal
39 GND GND
40 NC GPIO 21 (PCM DOUT) Not used on XE121