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BQ2002T 320 minute timer not working

Other Parts Discussed in Thread: BQ2002T

I have a BQ2002T battery charger management IC with the TM pin biased at Vcc/2. The thermistor has been replaced by a 10 K resistor to determine if the timer actually ends the charge cycle. It does not. I have tested it for more than 8 hours and it keeps on charging. I have set the timer to 40 minutes by connecting the TM pin to Vcc, and it works fine.

The BQ2002T supply is decoupled with a 1 uF capacitor and the thermistor (now a 10 K resistor) is connected through a decoupling network (100 K and .01 uF) as shown in the application note.

Has anybody seen this problem? It takes forever to troubleshoot because one has to wait for hours for the results of any modification. Very frustrating.

Thanks!