My system has only battery power, and I want to get alert when battery level drops.
(To prompt user to replace it, or to shut the system down.)
I’m adding a voltage-monitor (INA226) on my carrier board, and plan to connect its ALERT pin to wake the SOM from SC7 state.
I saw that there’s ‘vcomp_alert_N’ pin, which is ‘detailed/described’ as ‘Voltage Comparator Alert’, and is defined as ‘wake’, and is on VDDIO_SYS, 1.8V. (In pin list of SOM Datasheet v0.9)
In OEM Design Guide 20190614 Table 92 - Jetson AGX Xavier Connector Pin Descriptions - this pin is TBD.
Do I need to have external pull-up, or that one is on the SOM? To which voltage-rail?
I assume that all pins with ‘WAKE’ can be used. Is there any other pin which I should connect to - instead of VCOMP_ALERT_N?
Please refer to the schematic I have prepared.