Embedded Controller - Hardware Monitor; Tpm; Watchdog - Kontron COMh-caRP User Manual

3.5.2 Embedded Controller - Hardware Monitor

The embedded controller (EC) provides a broad set of functionality:
- monitoring the module's processor temperature, power supply voltages (VCC /5 VSB), battery
voltage V_BAT
- monitoring and configuring the on-board and external fans
- acting as hub or super-IO for low speed interfaces such as UART, I2C/SMB, GSPI, GPIO
- supporting watchdog functions
The EC is accessible through the API in the Board Support Package.

3.5.3 TPM

Trusted Platform Module is a BOM Option with the Infineon SLB9672 connected to SPI.

3.5.4 Watchdog

The watchdog timer interupt (WD_OUT) is a hardware or software timer implemented by the module
to the carrier board if there is a fault condition in the main program; the watchdog triggers a system
reset or other corrective actions after a specific time, with the aim to bring the system back from a
non-responsive to normal state.
The COMh-caAP supports an independently programmable watchdog that works with two stages that
can be used stage by stage.
No action
Reset
Delay → No action
WD_OUT only
Reset + WD_OUT
Delay + WD_OUT → No action
Table 27: Dual Staged Watchdog Timer - Time-Out Events
Watchdog Time-out
The COMh-caAP has 2 signals interfering with the watchdog.
WD_STROBE# is an input to trigger the watchdog timer. Periodic strobing prevents the watchdog, if
enabled, from timing out.
WD_OUT is an output indicating that a watchdog time-out event has occurred, when the setting
activates this signal.
COM-HPC EC Description
Passed through Embedded Controller.
WD_OUT GPIO036
Output indicating that a watchdog time-out event has occurred.
Passed through Embedded Controller.
WD_STROBE# GPIO035
Strobe input to watchdog timer.
www.kontron.com
Stage is off and will be skipped
Restarts the module and starts a new POST and operating system
Might be necessary when an operating system must be started and the time for the first trigger pulse
must be extended. Only available in the first stage!
Triggers WD_OUT pin on the carrier board connector only
COMh-caAP User Guide
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