GN1302

The GN1302 trickle charge timekeeping chip incorporates a real-time clock/calendar and 31 bytes of static RAM, communicating with a microprocessor via a simple serial interface. The real-time clock/calendar provides year, month, day, hour, minute, and second information, with automatic end-of-month adjustment for months with fewer than 31 days, as well as leap year correction. With an AM/PM indicator, the clock can operate in either 12-hour or 24-hour format. In addition to timekeeping functions, the device features: dual-pin primary and backup power supply, programmable trickle charger VCC1, and an additional 7-byte scratch pad register.

Applications

• Telephone
• Fax
• Portable instruments
• Battery-powered instrumentation

Key features

• Real-time clock computes year, month, date, day, hours, minutes, and seconds through year 2100 with leap-year compensation
• 31 x 8-bit general-purpose scratchpad RAM
• Wide operating voltage range: 2.0V to 5.5V
• Operating current less than 300nA at 2.0V
• Single-byte or multi-byte (burst mode) data transfer for clock/RAM read/write
• Simple 3-wire interface
• TTL-compatible
• Operating temperature: -20°C to +85°C
• Compatible with DS1202/DS1302