M41T82 Datasheet, PDF (1/58 Pages) STMicroelectronics – Serial RTC with battery switchover

M41T82
M41T83
Serial RTC with battery switchover
Features
■ 2.0 to 5.5V clock operating voltage
■ Ultra-low battery supply current of 365nA
■ Counters for tenths/hundredths of seconds,
seconds, minutes, hours, day, date, month,
year, and century
■ Programmable clock calibration (analog and
digital)
■ Automatic switchover and reset output circuitry
(fixed reference)
– M41T83S
V_CC = 3.00V to 5.50V
(2.85V ≤ V_RST ≤ 3.00V)
– M41T83R
V_CC = 2.70V to 5.50V
(2.55V ≤ V_RST ≤ 2.70V)
– M41T83Z
V_CC = 2.38V to 5.50V
(2.25V ≤ V_RST ≤ 2.38V)
■ Serial interface supports I²C Bus (400kHz
protocol)
■ 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 (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 80µA
QFN16, 4mm x 4mm (QA)
(VFQFPN16)
18
1
SOX18 (MY, 18-pin, 300mil SOIC
with Embedded Crystal)¹
SO8 (M)
1. Contact local ST sales office for availability of SOX18
package.
■ 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.
March 2007
Rev 4
1/58
www.st.com
1