miriac SBC-S32G-R3_User Manual
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© MicroSys Electronics GmbH 2021
4.4.5 Watchdog
Watchdog is triggered from the S32G274A port PB02. As long as PB02 is not
activated the watchdog is inactive. As soon as PB02 is activated once, the
watchdog is active and requires a permanent retrigger. It is not possible to stop
watchdog activity.
MIC826
MXM1
S32G274A
Pin
Name
Pin
Signal
Pin
Name
4
WDI
←
T111
PB02
←
W18
PB02
Table 4-2 Watchdog trigger
The MPX-S32G274A module has its own power supply. All SoM internal voltages
are generated from V_IN supplied from the carrier.
4.4.6 RTC Backup Battery
The RTC on the module is supplied from a 470mF supercap (C77) that is charged
by a power source on the carrier
4.4.7 Power control by KL15
Powerlines may be connected permanent to KL30 (+PWR) and KL31 (-PWR). As
long as KL15 is open the board is in standby.
There are 3 scenario for power control:
1. Power controlled
a) Connect KL30 and KL15 to +PWR
b) PWR external
2. KL15 controlled
a) Connect KL30 to +PWR
b) Connect KL15 to +PWR to switch ON
c) Disconnect KL15 (open) to switch OFF
3. KL15 controlled with power hold
a) Connect KL30 to +PWR
b) Connect KL15 to +PWR to switch ON
c) Set GPIO2 in IO-expander J47 (addr 0x44) to 1 for HOLD
d) Disconnect KL15 (open) to switch OFF
e) System will remain ON by HOLD
f) Reset GPIO2 in IO-expander J47 (addr 0x44) to 0 to switch OFF
