Hello
I wish to be able to monitor CHG and PGOOD both with an LED and with a microcontroller (at least for prototyping). Does this setup make sense for this? OUT is the BQ24074 output and 3V3 is the output from an LDO (powered by the BQ24074). The 0R jumper would be used to disconnect the LED from the microcontroller in case only LEDs are used for monitoring (to provent damaging the microcontroller input pin with the OUT voltage).
When CHG is HIGH-Z, voltage at the microcontroller pin should be 3V3 and the LED should not turn on (because voltage for LED is OUT-3.3 < LED forward voltage). When CHG is LOW, voltage at the microcontroller should be LOW and LED should turn on.
Would reverse currents into the LDO be a problem in the CHG=HIGH-Z case? I would think not, because the LED forward voltage would not be met, and so no current would flow to 3V3? Lastly, would anything change for the case when OUT=VBAT=3.3 to 4.2?
These are the LEDs I am thinking of using, 2.1 V forward voltage: https://www.digikey.com/es/products/detail/LTST-C190YKT/160-1184-1-ND/269256?utm_campaign=buynow&utm_medium=aggregator&curr=usd&utm_source=octopart
Thanks in advance!
Best,
Dan
