General Information; Access Interface - Aaeon COM-690T Manual

C O M E x p r e s s M o d u l e C O M - 6 9 0 T / C O M - 6 9 0 E
A.1 General Information
The COM-690T/COM-690E utilizes Fintek F75111 chipset as its
watchdog timer Controller.
The other Watchdog timer is set to second or minute and the range is 0
to 256 seconds or minutes.
When the timeout has occurred, that will generate a status bit to indicate
it and write one will be clear.
A.2 Access Interface
The F75111 provides one serial access interface, I2C Bus, to read/write
internal registers. The address of Serial Bus is
configurable by using power-on trapping of standby power VBS3V. The
pin 3 (GPIO13/I2C _ADDR) is multi-function pin. During the
VSB3V power-on, this pin serves as input detection of logic high or logic
low. This pin is default pull-down resistor with 100K ohms
mapping the Serial Bus address 0x9C (1001_1100). Another Serial Bus
address 0x6E (0110_1110) is set when external pull-up resistor with
10K ohms is connected in this pin.
Appendix A Programming the Watchdog Timer A-2