M41T82_08 Datasheet, PDF (1/58 Pages) STMicroelectronics – Serial I2C bus RTC with battery switchover

M41T82
M41T83
Serial I²C bus RTC with battery switchover
Features
■ Ultra-low battery supply current of 365 nA
■ Factory calibrated accuracy ±5 PPM
guaranteed 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 back-up 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
■ Power-down time stamp (HT bit)
■ Low operating current of 80 µA
QFN16, 4 mm x 4 mm (QA)
(VFQFPN16)
18
1
SOX18 (MY, 18-pin, 300 mil SOIC
with embedded crystal)
SO8 (M)
■ Oscillator stop detection
■ Battery or Super-cap™ back-up
■ Operating temperature of –40°C to 85°C
■ Package options include:
– a 16-lead QFN (M41T83),
– an 18-lead embedded crystal SOIC
(M41T83), or
– an 8-lead SOIC (M41T82)
■ RoHS compliance: lead-free components are
compliant with the RoHS directive
April 2008
Rev 7
1/58
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