Embedian, Inc.
154
SMARC-iMX8M Computer on Module User’s Manual v.1.0
Module and Carrier power supplies (other than Module and Carrier power
supervisory circuits) will not be enabled while this signal is held low by the
Carrier.
This signal has a 100K pull‐up on module and is driven by
OD
part on Carrier.
4.1.8. System Power Domains
It is useful to describe an
SMARC
system as being divided into a hierarchy of
three power domains:
1) Battery Charger power domain (can be neglected if the system is not
battery powered only)
2)
SMARC
Module power domain
3) Carrier Circuits power domain
The Battery Charger domain includes circuits that are active whenever
either charger input power and / or battery power are available. These
circuits may include power supply supervisor(s), battery chargers, fuel
gauges and, depending on the battery configuration, switching power
section(s) to step down a high incoming battery voltage.
The
SMARC
Module domain includes the
SMARC
module.
The Carrier Circuits domain includes “everything else” (and does not include
items from the Battery Charger and Module domain, even though they may
be mounted on the Carrier).
This is illustrated in the figure below.