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GPIO mapping
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GPIO mapping
There are three groups of GPIO pins on PROTEUS. First group is connected between I2C GPIO
expander and connector J9. The second group is connected between SUPERIO and COM express
connector (J22) and the third group is connected between CPLD and J22.
I2C GPIO pin mapping
PCA9535 I2C GPIO expander is mapped to I2C address 0x4E/0x4F (Read/Write). Following table
shows GPIO expander port connections.
PCA9535 port number
Signal
Description
P0
GPIO_P0
Connected to
J9
pin 1
P1
GPIO_P1
Connected to J9 pin 3
P2
GPIO_P2
Connected to J9 pin 4
P3
GPIO_P3
Connected to J9 pin 5
P4
GPIO_P4
Connected to J9 pin 6
P5
GPIO_P5
Connected to J9 pin 7
P6
GPIO_P6
Connected to J9 pin 8
P7
GPIO_P7
Connected to J9 pin 9
P8
I2C_USER_LED
Connected to J6 pin 9
P9
USBPWR_02_EN#
USB power enable for ports 0 and 2
P10
USBPWR_1_EN#
USB power enable for port 1
P11
DNU
DO NOT USE, DO NOT CHANGE
P12
DNU
DO NOT USE, DO NOT CHANGE
P13
NC
Not connected
P14
Read RTC Battery
Disconnect RTC battery from +3.3
Always
P15
I2C_SATA_VDD_EN SATA power enable