M41T83_12 Datasheet, PDF (1/62 Pages) STMicroelectronics – Serial I2C bus real-time clock (RTC) with battery switchover

M41T82
M41T83
Serial I²C bus real-time clock (RTC) with battery switchover
Features
■ Ultra-low battery supply current of 365 nA
■ Factory-calibrated accuracy of ±5 ppm typical
after 2 reflows (SOX18)
– Much better accuracies achievable using
built-in programmable analog and digital
calibration circuits
■ 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)
– M41T83S
V_CC = 3.00 V to 5.50 V
(2.85 V ≤ V_RST ≤ 3.00 V)
– M41T83R
V_CC = 2.70 V to 5.50 V
(2.55 V ≤ V_RST ≤ 2.70 V)
– M41T83Z
V_CC = 2.38 V to 5.50 V
(2.25 V ≤ V_RST ≤ 2.38 V)
■ Serial interface supports I²C bus (400 kHz
protocol)
■ Programmable alarm with interrupt function
(valid even during battery backup mode)
■ Optional 2^nd programmable alarm available
■ Square wave output defaults to 32 KHz on
power-up (M41T83 only)
■ RESET (RST) output
■ Watchdog timer
■ Programmable 8-bit counter/timer
■ 7 bytes of battery-backed user SRAM
■ Battery low flag
■ Low operating current of 80 µA
Datasheet − production data
QFN16 (4 mm x 4 mm)
SO8 (150 mil)
18
1
SOX18, embedded crystal (300 mil)
■ Oscillator stop detection
■ Battery or SuperCap™ backup
■ Operating temperature of –40 °C to 85 °C
■ Package options
– a 16-lead QFN (M41T83),
– an 8-lead SOIC (M41T82), or
– an 18-lead embedded crystal SOIC
(M41T83)
■ RoHS compliance: lead-free components are
compliant with the RoHS directive
October 2012
This is information on a product in full production.
Doc ID 12578 Rev 15
1/62
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