Kontron SMARC Evaluation Carrier - Manual (Page 59)

User’s Guide
59 www.kontron.com
miscellaneous control
5 TI TCA9554 IO Expander U33 0x24 0x48 / 0x49 Miscellaneous control
6
Wolfson
WM8903
Audio Codec U54 0x1B 0x36 / 0x37
7 NS LP8545
Backlight
LED Supply
U16 0x54
May not be visible – this
device has PWM and I2C
modes – initial builds are
with PWM modes.
I2C_CAM Bus
1 Atmel AT24HC02 EEPROM U31 0x54 0xA8 / 0xA9
HDMI I2C Bus
1
No HDMI I2C devices on
the Eval Carrier. I2C
device(s) should be visible
if an HDMI display is
connected.
15.2 I2C Bus Power Domains
The Evaluation Carrier I2C_PM bus devices are in the Module Power Domain, and not in the Carrier Power Domain. This
allows the Module to use the I2C_PM bus for monitoring and controlling power on the Evaluation Carrier. The other I2C
buses (I2C_LCD, I2C_GP, I2C_CAM, and HDMI) are in the Carrier Power Domain.
15.3 I2C PM Bus I/O Expanders
There are two I/O expanders on the I2C_PM bus. One is used to enable / disable various power rails on the Evaluation
Carrier, and the other to monitor the Power Good status of most these rails.
The use of these I/O expanders is optional, and the Evaluation Carrier can function without any manipulation of these
devices. The devices power up such that all of their I/O pins are inputs, and pull-up or pull-down resistors ensure that
the default function is in the ‘Enabled’ state.