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Part Number: BQ32000
My customer measured the backup supply current and found it was up to 80uA, then we found the description that VCC pin must be initialized after every total power loss situation in datasheet, section 126.96.36.199 Utilizing the Backup Supply.
Does it mean we need to apply an additional 3.3V, >1ms pulse at VCC after VCC is not powered? Could you please suggest how to implement the initialization based on the schematic below? Thanks for your support!
My coworker will get back to you tomorrow.
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In reply to Hao Z:
Yes that is correct: you need to apply an additional 3.3V, >1ms pulse at VCC after VCC_RTC is applied to VBACK. You could apply VDD and VBACK for >1ms during system initialization after power-up.
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