VIA Technologies SOM-9X35, Design Manual, Page: 67 / 81

Carrier Board Design Guide for SOM-9X35 Module
58
4.8 GPIO Interface
The SOM-9X35 module features a General Purpose Input/Output (GPIO) interface.
4.8.1 GPIO Signal Definition
The following table provides the definition of the GPIO signals that are implemented in the M.2 slot. All SOM-
9X35 GPIOs are 1.8V domain only, all device ports should be the same.
Signal Name Pin # I/O
Pad Characteristics
Description
Voltage Type
EXT_INT3 J2.31 GPIO105 1.8V O, PD
MT8365 EINT105, IO Extender interrupt
input, Low active
EXT_INT2 J2.33 GPIO115 1.8V I, PD
MT8365 EINT115, G-sensor interrupt
input, High active
EXT_INT1 J2.35 GPIO67 1.8V I, PD MT8365 EINT67, Reserved
EXT_GPIO3 J2.20 GPIO130 1.8V I, PD
MT8365 GPIO130, default for SPI_BUSY,
input, High active
EXT_GPIO2 J2.22 GPIO131 1.8V I, PD
MT8365 GPIO131, default for NFC_CARD_
INT, input, High active
EXT_GPIO1 J2.24 GPIO129 1.8V I, PD
MT8365 GPIO129, default for NFC_CARD_
RESET, output, High active
Table 33: SOM-9X35 GPIO signal definition
Level S hi�
Very fast switching
1V8_VCC
3V3_VCC
1V8_VCC
3V3_VCC
EXT_INT1 [5]
EXT_GPIO1
EXT_3V3_GPIO5
EXT_3V3_GPIO6 [15,25]
Q42
BSS138BKS
60V 320mA
TRANSISTOR DUAL N CHANNEL
S1
1
G1
2
D2
3
S2
4
G2
5
D1
6
C622
1000pF
50V
X7R
R371 10K
R363
4.7K_1%
R370 4.7K_1%
C621
1000pF
50V
X7R
R364
10K
EXT_3V3_GPIO5
EXT_3V3_GPIO6
[5]
[15,25]
Figure 71: GPIO level shift reference circuitry