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BQ24171: TTC STAT blinking - disabling timer works fine, enabled instantly errors

Part Number: BQ24171

Hi, 
Hopefully someone can give me a shove in the right direction.

I have implemented the BQ24171 in almost the exact setup as the evaluation board, but what I notice is that with TTC enabled (0.1uF capacitor to ground) the system instantly flags an error.  If i short the TTC pin to VREF the charger functions correctly.  If the timer is set to 56 minutes, what causes this error?

Thanks

Allen