I²C 32-Bit Binary Counter RTC

The DS1672 low-voltage serial timekeeping chip incorporates a 32-bit counter and power-monitoring functions. The 32-bit counter is designed to count seconds and can be used to derive time-of-day, week, month, and year by using a software algorithm. A precision, temperature-compensated reference and comparator circuit monitors the status of VCC. When an out-of-tolerance condition occurs, an internal power-fail signal is generated that forces the reset to the active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for 250ms to allow the power supply and processor to stabilize.

* 32-Bit Counter

* I²C Serial Interface

* Automatic Power-Fail Detect and Switch Circuitry

* Power-Fail Reset Output

* Low-Voltage Oscillator Operation (1.3V min)

* Trickle-Charge Capability