ISL12021 Datasheet (Intersil Corporation)

ISL12021, Real Time Clock

PIN NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 SYMBOL N/C X1 X2 VBAT GND LVRST N/C N/C FOUT SDA SCL IRQ VDD N/C No connect.

X1.

The X1 pin is the input of an inverting amplifier and is intended to be connected to one pin of an external 32.768kHz quartz crystal.

X1 can also be driven directly from a 32

® ISL12021 Real Time Clock with On Chip Temp Compensation ±5ppm Data Sheet March 30, 2007 FN6451.0 Low Power RTC with VDD Battery Backed SRAM and Embedded Temp Compensation ±5ppm with Auto Day Light Saving The ISL12021 device is a low power real time clock with an embedded Temp sensor for oscillator compensation, clock/calendar, power fail, low battery monitor, brown out indicator, single periodic or polled alarms, intelligent battery backup switching and 128 bytes of battery-backed user SRAM.

ISL12021 Features

* Real Time Clock/Calendar - Tracks Time in Hours, Minutes and Seconds - Day of the Week, Day, Month and Year

* On-chip Oscillator Compensation Over the Operating Temp Range - ±5ppm over -20°C to +70°C

* Day Light Saving Time - Customer Programmable

* Separate FOUT pi