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User’s Guide

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15.4

I2C GP Bus I/O Expanders

There are three I/O expanders on the I2C_GP bus, described in the tables below. “Module” notation means that the

pull-up is on the Module (weak pull-up per the SMARC specification)

Device

I2C Address

Output

Function

Pulled

Low

U44

TCA9554

0x20

(7 bit)

0x40 / 0x41

(8 bit)

GPIO0/CAM0_PWR#

GPIO0 R/W

Module

GPIO1/CAM1_PWR#

GPIO1 R/W

Module

GPIO2/CAM0_RST#

GPIO2 R/W

Module

GPIO3/CAM1_RST#

GPIO3 R/W

Module

GPIO4/HDA_RST#

GPIO4 R/W

Module

GPIO5/PWM_OUT

GPIO5 R/W

Module

GPIO6/TACHIN

GPIO6 R/W

Module

GPIO7/PCAM_FLD

GPIO7 R/W

Module

Device

I2C Address

Output

Function

Pulled

Low

U43

TCA9554

0x21

(7 bit)

0x42 / 0x43

(8 bit)

GPIO8/CAN0_ERR#

GPIO8 R/W

Module

GPIO9/CAN1_ERR#

GPIO9 R/W

Module

GPIO10

GPIO10 R/W

Module

GPIO11

GPIO11 R/W

Module

LVDS_EVEN_SHDN#

Shutdown Carrier LVDS – even

Low

LVDS_ODD_SHDN#

Shutdown Carrier LVDS – odd

Low

Not used

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 73 74

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