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BQ32002 Datasheet(PDF) 7 Page - Texas Instruments |
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BQ32002 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 29 page I2C Register Interface With Undervoltage Lockout Interrupt Generator 32-kHz Oscillator VCORE Registers Automatic Backup Switch V CC 4.7 NŸ 4.7 NŸ 4.7 NŸ V CC V CC IRQ SCL SDA GND OSCO OSCI V BACK 1 µF .22 F Place supply-decoupling capacitor near supply pin Use only super-capacitor or battery, not both Copyright © 2016, Texas Instruments Incorporated 7 BQ32002 www.ti.com SLUSA96B – AUGUST 2010 – REVISED APRIL 2016 Product Folder Links: BQ32002 Submit Documentation Feedback Copyright © 2010–2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The BQ32002 is a real-time clock that features an automatic backup supply with integrated oscillator-fail detection. 7.2 Functional Block Diagram NOTE: All pullup resistors should be connected to VCC such that no pullup is applied during backup supply operation. 7.3 Feature Description 7.3.1 IRQ Function The IRQ pin of the BQ32002 functions as a general-purpose output or a frequency test output. The function of IRQ is configurable in the device register space by setting the FT, FTF, and OUT bits. On initial power cycles, the OUT bit is set to one, and the FTF and FT bits are set to zero. On subsequent power-ups, with backup supply present, the OUT bit remains unchanged, and the FTF and FT bits are set to zero. When operating on backup supply, the IRQ pin function is unused. IRQ pullup resistor must be tied to VCC to prevent IRQ operation when operating on backup supply. The effect of the calibration logic is not normally observable when IRQ is configured to output 1 Hz. The calibration logic functions by periodically adjusting the width of the 1-Hz clock. The calibration effect is observable only every eight or sixteen minutes, depending on the sign of the calibration. |
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