BQ4847YMT

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1. Description

The BQ4847YMT real-time clock module is a low-power microprocessor, which integrates the date clock, 100-year calendar, CPU manager, battery and crystal in the 28-pin DIP module. This part is ideal for fax machines, copiers, industrial control systems and point of sale Terminal, data logger and computer. bq4847 contains an internal Battery and crystal. by using Conditional chip enable output (CEOUT) and battery voltage output The (VOUT) pin of BQ4847 can be write-protected and made nonvolatile External SRAM. spare battery Power the real-time clock, Keep SRAM information There is no system voltage. bq4847 contains a Temperature compensation reference and comparator circuit Monitor its voltage status supply. When the tolerance is out of range Condition detected, bq4847 Generate an interrupt warning Then the microprocessor resets. Reset keep alive 200ms after VCC rises Allowable power supply tolerance And the stability of the processor. bq4847 also has built-in functions Watchdog timer to monitor the processor surgery.

2. Function Description

The BQ4847YMT is functionally the same as bq4845 except that the battery (20, 24) and crystal (2, 3) pins cannot be used. This pin is internally connected to the button cell and quartz crystal. The button battery provides a capacity of 130mAh. Before starting, it internally isolates the application of VCC from VOUT and CEOUT. When VCC rises above VPFD, this isolation will be disconnected and the backup unit will be VOUT and CEOUT of the external SRAM. real-time The clock keeps the time within one minute of the room temperature per month. A complete description of functions, operating conditions, electrical characteristics, bus timing and pin descriptions.

3. Features

    1. Real-Time Clock counts seconds through years in BCD format

    2. Integrated battery and crystal

    3. On-chip battery-backup switchover circuit with nonvolatile control for an external SRAM

    4. 130mAh battery capacity

    5. ±1 minute per month clock accuracy

    6. Less than 500nA of clock operation current in backup mode

    7. Microprocessor reset valid to VCC = VSS

    8. Independent watchdog timer with a programmable time-out period

    9. Power-fail interrupt warning

  10. Programmable clock alarm interrupt active in battery-backup mode

  11. Programmable periodic interrupt

  12. Battery-low warning

4. Pin Connections

5. Package dimensions