Microchip Technology MCP79410-I/MS

Description
The MCP7941X series of low-power Real-Time Clocks (RTCs) utilizes digital timing compensation for accurate timekeeping. It features a programmable output control for versatility, a power sense circuit for automatic backup supply switching, and nonvolatile memory for data storage. Using a low-cost 32.768 kHz crystal, it tracks time using internal registers and communicates via the I²C™ bus.
The clock/calendar automatically adjusts for months with fewer than 31 days, including leap year corrections. It operates in 24-hour or 12-hour format with an AM/PM indicator and settable alarms to the second, minute, hour, day of the week, date, or month. The programmable CLKOUT generates frequencies of 32.768, 8.192, 4.096 kHz, and 1 Hz from the external crystal.
Along with the on-board Serial EEPROM and battery-backed SRAM memory, a 64-bit protected space is available for a unique ID or MAC address, programmable at the factory or by the end user. The device is fully accessible through the serial interface while Vcc is between 1.8V and 5.5V, but can operate down to 1.3V for timekeeping and SRAM retention only.

Features
Real-Time Clock/Calendar (RTCC) with battery backup
Programmable output control for CLKOUT and alarm output
64 Bytes SRAM, battery backed
1 Kbits EEPROM (128x8) with block/sector write protection
Separate 64-Bit Unique ID, user or factory programmable
Automatic Vcc switchover to VBAT backup supply
Low-power CMOS technology
Dynamic current: 400 μA max read, 3mA max EEPROM write
Battery backup current: <700nA @ 1.8V
100 kHz and 400 kHz I²C compatibility
ESD protection >4,000V
More than 1 million Erase/Write cycles
Pb-Free and RoHS Compliant

Applications
Timekeeping and date stamping
Alarm and event scheduling
Data logging and storage
Unique ID and MAC address generation
Battery-powered devices
Industrial and automotive applications