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3.5.4 Watchdog
The COMh-sdID supports two signals interfering with the watchdog implementation of the Embedded
Controller.
COM-HPC
EC
Description
Passed through Embedded Controller.
Output indicating that a watchdog time-out event has occurred. The watchdog timer interupt (WD_OUT) is a
WD_OUT
GPIO036
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.
Passed through Embedded Controller.
WD_STROBE# GPIO035
Strobe input to watchdog timer.
Table 23: Watchdog signal on COM-HPC connector
The COMh-sdID supports an independently programmable watchdog that works with three stages that
can be used stage by stage.
The watchdog functionality is accessible through the API of the Embedded Controller (EC) in the
related Board Support Package.
Please find more information about the watchdog implementation in the according user guide for the
EC implementation.
3.5.5 Real-Time Clock (RTC)
The RTC keeps track of the current time accurately. The RTC's low power consumption enables the
RTC to continue operation and keep time using a lower secondary source of power while the primary
source of power is switched off or unavailable.
The COMh-sdID supports typical RTC values of 3 V and less than 10 μA. When powered by the main
power supply on-module regulators generate the RTC voltage, to reduce RTC current draw. The RTC's
battery voltage range is 2.8 V to 3.47 V.
It is not recommended to run a system without a RTC battery on the carrier board. Even
if the RTC battery is not required to keep the actual time and date when main power is
off, a missing RTC battery will cause other side effects such as longer boot times. Intel
processor environments are generally designed to rely on RTC battery voltage.
3.5.6 NVME
On some COM-HPC modules a PCIe NVMe NAND Flash SSD (with a capacity up to 1TB) can be
populated optionally.
As BOM option an NVMe SDD (BGA) can be populated on the COMh-sdID.
The optional NVMe SSD uses HSIO #18 of the SoC - see also chapter 3.3.7 High-Speed Interface
Overview.
www.kontron.com
COMh-sdID User Guide
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