Artesyn COMX-P4080 Installation and Use (August 2014) - Manual (Page 70)

Functional Description
COMX-P4080 COM Express Module Installation and Use (6806800L20C) 70
4.17 RTC and Watchdog Timer
The RTC and Watchdog Timer (WDT) are integrated in the module through the IC U12, which
is accessed first by the I2C bus, address 0xD0. This device also provides a reset output signal for
the COMX-P4080, as well as a 32 KHz clock output for the RTC. Battery backup for the RTC is
supplied by the VCC_BAT pin on the COM-E connectors.
The WDT is fed by the GPIO 18 of the COMX-P4080.
4.18 Thermal Sensor
The COMX-P4080 module supports both remote and local thermal sensors. The remote
thermal sensor is available when there is a thermal diode provided in the COMX-P4080 and is
accessed by the first I2C bus with the address 0x98.
Table 4-10 GPIO Details Distribution
GPIO name Function
GPIO 0 Connected to the GPI 0 of the COM-E carrier board
GPIO 1 Connected to the GPI 1 of the COM-E carrier board
GPIO 2 Connected to the GPI 3 of the COM-E carrier board
GPIO 3 Connected to the GPI 4 of the COM-E carrier board
GPIO 4 Connected to the GPO 0 of the COM-E carrier board
GPIO 5 Connected to the GPO 1 of the COM-E carrier board
GPIO 6 Connected to the GPO 3 of the COM-E carrier board
GPIO 7 Connected to the GPO 4 of the COM-E carrier board
GPIO 18 WDT input
GPIO 19 Clock generators enable control
GPIO 20 Carrier board reset output
GPIO 23 Clock generator of bank 1 frequency selection
GPIO 24 Clock generator of bank 2 frequency selection
GPIO 26 Clock generator of bank 3 frequency selection