STMicroelectronics M41T93SMY6F

Description
The M41T93 is a serial SPI bus real-time clock (RTC) with battery switchover. It features an ultra-low battery supply current of 365 nA and a factory-calibrated accuracy of ±5 ppm typical after 2 reflows (SOX18). The M41T93 operates from a 2.0 V to 5.5 V clock operating voltage and is compatible with the SPI bus serial interface (supports SPI mode 0 [CPOL = 0, CPHA = 0]).

Features
Ultra-low battery supply current of 365 nA
Factory-calibrated accuracy ±5 ppm typical after 2 reflows (SOX18)
2.0 V to 5.5 V clock operating voltage
Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
Automatic switchover and reset output circuitry (fixed reference):
M41T93S: Vcc 3.0 V to 5.5 V
M41T93R: Vcc 2.7 V to 5.5 V
M41T93Z: Vcc 2.38 V to 5.50 V
Compatible with SPI bus serial interface (supports SPI mode 0 [CPOL = 0, CPHA = 0])
Programmable alarm with interrupt function (valid even during battery backup mode)
Optional 2nd programmable alarm available
Square wave output (defaults to 32 KHz on power-up)
RESET (RST) output
Watchdog timer

Applications
Timekeeping in embedded systems
Data logging
Industrial control
Medical devices
Consumer electronics