X221D & X221D-AI TECHNICAL REFERENCE MANUAL
VERSION: 0.3
Page 21 of 40
SECTION 6
Pinout description bottom side
6.1
J18 – WiFi
6.2
J21 – Power Button
6.3
J23 – I2S3
SM08B-GHS-TB
Pin
Description
Socket pin
Note
1
VDD
3V3
2
I2S3_DIN
GPIO3 PA.06
3
I2S3_DOUT
GPIO3 PA.05
4
I2S3_FS
GPIO3 PA.07
5
I2S3_SCLK
GPIO3 PA.04
6
GPIO24_SAR_TOUT
GPIO3 PM.03, J51
7
GPIO19_SLVS_VSYNC
GPIO3 PQ.07, K56
8
GND
6.4
J25 – Force Recovery Button
6.5
J26 – Reset Button
6.6
J27 – MicroSD UFS
6.7
J29 – USB 2.0
6.8
J30 – UART5 + MCU
SM08B-GHS-TB
Pin
Description
Socket pin
Note
1
VDD
3V3
2
UART_TXD
3V3
3
UART_RXD
3V3
4
LTE_INT
5
UART5_TX
3V3
6
UART5_RX
3V3
7
UART5_RTS
3V3
8
GND
6.9
J31 – Power out
SM08B-GHS-TB
Pin
Description
Socket pin
Note
1
VCC_SRC_FET
Input Voltage = 12V (always on)
2
VCC_SRC_FET
Input Voltage = 12V (always on)
3
VCC_SRC
12V