Other Parts Discussed in Thread: BQSTUDIO, BQ34Z100
This part has SOC indication that can be multiple LEDs or a single LED. The documented single LED scheme is here (out of SLUSBZ5D pg.39):
" Single LED mode—Upon detecting an A/D value representing 2.5 V on the VEN pin, Single LED mode will
toggle the LED as duty cycle on within a period of 1 s where each 1% of RSOC is a 7.8125-ms high time. So,
for example, 10% RSOC or SOH will have the LED on for 78.1 ms and off for 921.9 ms. 90% RSOC or SOH will
have the LED on for 703.125 ms and off for 296.875 ms. Any value > 90% will display as 90%. "
The part does not do this.
We see 0 to 100% duty cycle signal with a period of 800 milliseconds, for 4 cycles, and then no signal for one 800 millisecond "period".
This entire waveform repeats with a total period approaching five seconds. Having designed a low pass filter around the documented specification to create a voltage indicating SOC, we may find it necessary to increase further our time constants and our settling time, if we cannot find a configuration that will follow the part's documentation.
