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BQ32002: The 1'st reading value(timer) always wrong, faster than current actual time approx 15 sec.

Part Number: BQ32002

hi,

When I read the RTC value from BQ32002, the first reading after reboot, the RTC value always faster than the actual current time approx 15sec.

i use the Logic Analyzer to make sure those data was truly sent out by BQ32002, and it's not decode wrong by my MCU.

 the Vback always exist 3V, and i didn't read the BQ32002 immediately after system power on(Vcc), always read it after Vcc stable for at least 5 sec.

So it's my question why it's always be wrong at the first reading?