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DS1672：I²C 32-Bit Binary Counter RTC

Low-Voltage, Serial Timekeeping Chip Combines an Ultra-Low-Voltage Clock with Sophisticated Power-Monitoring Circuitry, Power-Fail Switches, and a Switch to Optional Trickle-Charging, Replacing Several Discrete Components with One Chip

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.

Key Features 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

DS1672: Typical Operating Circuit

DataSheet

Parametrics

Quality and Environmental Data

• DS1672.pdf

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