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SLUS900E – DECEMBER 2008 – REVISED AUGUST 2015 bq32000 Real-Time Clock (RTC)
1 Features 3 Description The bq32000 device is a compatible replacement for
industry standard real-time clocks. 1 Automatic Switchover to Backup Supply
I2C Interface Supports Serial Clock up to 400 kHz
Uses 32.768-kHz Crystal With –63-ppm to
+126-ppm Adjustment
Integrated Oscillator-Fail Detection
8-Pin SOIC Package
–40°C to 85°C Ambient Operating Temperature 2 Applications General Consumer Electronics The bq32000 features an automatic backup supply
with integrated trickle charger. The backup supply
can be implemented using a capacitor or nonrechargeable battery. The bq32000 has a
programmable calibration adjustment from –63 ppm
to +126 ppm. The bq32000 registers include an OF
(oscillator fail) flag indicating the status of the RTC
oscillator, as well as a STOP bit that allows the host
processor to disable the oscillator. The time registers
are normally updated once per second, and all the …
