Embedian SMARC-iMX8M Series, Руководство пользователя, Страница: 162 / 174

Embedian, Inc.
162
SMARC-iMX8M Computer on Module User’s Manual v.1.0
When main power is supplied from the carrier, a voltage detector will assert
VIN_PWR_BAD# signal to tell the module and carrier that the power is good.
This signal will turn on the PMIC on module to power on the module.
Carrier power circuits in the carrier Power domain should not power up unless
the module asserts
CARRIER_PWR_ON . The module signal CARRIER_PWR_ON
exists to ensure that the module is powered before the main body of carrier
circuits (those outside the power and power control path on the carrier).
The main body of carrier board circuits will not be powered until the module
asserts the
CARRIER_PWR_ON signal being correct. Module hardware will
assert CARRIER_PWR_ON when all power supplies necessary for module
booting are ready. The module will continue to assert signal RESET_OUT# after
the release of CARRIER_PWR_ON , for a period sufficient to allow carrier power
circuits to come up. When Carrier power is ready, it will assert RESET_IN# to
inform module booting up.
If users would like to have SD boot up, SDIO_PWR_EN signal have to be pull up
to 3.3V on carrier.
Module and carrier power supplies will not be enabled if the VIN_PWR_BAD#
is held low by carrier. It is a power bad indication signal from carrier and is
200k pull up to
VDD_IN on module.