Hi Team,
I have an inquiry from one of our customers. Can you please review.
Appreciate the help!
____
Due to some design oversights with our contract EE, we’ve got a battery that is entirely too large (1S6P, 15.6Ah @ 3.7V) for our PMIC (bq24040), so we generally run out of charge timer long before charging completes. This is a product which is currently going to be plugged in, with a battery backup (though after more software, we’d planned it would be mostly-battery/occasional recharge), and charge-timer expiration means that it sometimes ceases to run off wall-power, and discharges the battery, despite being plugged in.
An unrelated manufacturing-time problem left a resistor populated between Vin and TS. This has tied TS high - which puts it in “TTDM mode,” solving our timer problem! But we know TTDM has other implications, and at a minimum mistreats the battery. We aren’t sure if the other implications are potentially more-serious (our background is in software), or are something we’d be willing to tolerate. (this is a product iteration whose life will be relatively short-lived. “it’ll take a year off the battery life” is probably fine. “it’ll burn your house down” is absolutely not fine.)
