M41T93_07 Datasheet, PDF (1/51 Pages) STMicroelectronics – Serial SPI bus RTC with battery switchover

M41T93
Serial SPI bus RTC with battery switchover
Features
■ Ultra-low battery supply current of 365nA
■ Factory calibrated accuracy ±5PPM
guaranteed after 2 reflows (SOX18)
– Much better accuracies achievable using
built-in programmable analog and digital
calibration circuits
■ 2.0V to 5.5V clock operating voltage
■ Counters for tenths/hundredths of seconds,
seconds, minutes, hours, day, date, month,
year, and century
■ Automatic switch-over and reset output
circuitry (fixed reference)
– M41T93S: V_CC = 3.0V to 5.5V
(2.85V ≤ V_RST ≤ 3.00V)
– M41T93R: V_CC = 2.7V to 5.5V
(2.55V ≤ V_RST ≤ 2.70V)
– M41T93Z: V_CC = 2.38V to 5.50V
(2.25V ≤ V_RST ≤ 2.38V)
■ Compatible with SPI bus serial interface
(positive clock SPI modes)
■ Programmable alarm with interrupt function
(valid even during battery back-up mode)
■ Optional 2^nd programmable alarm available
■ Square wave output (defaults to 32kHz on
power-up)
■ RESET (RST) output
■ Watchdog timer
■ Programmable 8-bit counter/timer
■ 7 bytes of battery-backed user SRAM
■ Battery low flag
■ Power-down time stamp (HT bit)
■ Low operating current of 80µA
■ Oscillator stop detection
■ Battery or Super-cap™ back-up
■ Operating temperature of –40°C to +85°C
QFN16, 4mm x 4mm (QA)
18
1
SOX18 (MY, 18-pin, 300mil SOIC
with embedded crystal)
■ Package options include:
– a 16-lead QFN or an 18-lead embedded
crystal SOIC
■ RoHS compliance: lead-free components are
compliant with the RoHS directive
October 2007
Rev 3
1/51
www.st.com
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