BQ32000

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community bq32000 SLUS900E – DECEMBER 2008 – REVISED AUGUST 2015 bq32000 Real-Time Clock (RTC) 1 Features 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 3 Description The bq32000 device is a compatible replacement for industry standard real-time clocks. 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 registers are updated at the same time to prevent a timekeeping glitch. The bq32000 includes automatic leap-year compensation. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) bq32000 SOIC (8) 4.90 mm x 3.91 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Simplified Schematic 3.0 to 3.6 V Controller SCL SDA ____ IRQ bq32 000 Real-Time Clock...