m41st85w STMicroelectronics, m41st85w Datasheet
m41st85w
Manufacturer Part Number
m41st85w
Description
3.0/3.3v I 2c Combination Serial Rtc, Nvram Supervisor And Microprocessor Supervisor
Manufacturer
STMicroelectronics
Datasheet
1.M41ST85W.pdf
(41 pages)
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Features
■
■
■
■
■
Serial RTC features
■
■
■
■
■
■
Microprocessor supervisor features
■
■
October 2007
Automatic battery switchover and WRITE
protect for:
– Internal serial RTC and
– External low power SRAM (LPSRAM)
400kHz I
3.0/3.3V operating voltage
– V
Ultra-low battery supply current of 500nA (max)
RoHS compliant
– Lead-free second level interconnect
400kHz I
44 bytes of general purpose NVRAM
Counters for:
– Seconds, minutes, hours, day, date, month,
– Century
– 10ths/100ths of seconds
– Clock calibration register allows
Programmable alarm with repeat modes
– Functions in battery back-up mode
Power-down timestamp (HT Bit)
2.5 to 5.5V oscillator operating voltage
Programmable watchdog
– 62.5ms to 128s time-out period
Early power-fail warning circuit (PFI/PFO) with
1.25V precision reference
and year
compensation for crystal variations over
temperature
CC
= 2.7 to 3.6V
2
2
C serial interface
C
3.0/3.3V I
supervisor and microprocessor supervisor
2
C combination serial RTC, NVRAM
Rev 9
■
NVRAM supervisor features
■
■
Other features
■
■
■
Power-on reset/low voltage detect
– Open drain reset output
– Reset voltage, V
– Two reset input pins
– Watchdog can be steered to reset output
Non-volatizes external LPSRAM
– Automatically switches to back-up battery
– Power-fail deselect (write protect) voltage,
– Switchover , V
Battery monitor (battery low flag)
Programmable squarewave generator (1Hz to
32KHz)
–40°C to +85°C Operation
Package options:
– 28-lead SNAPHAT
– 28-lead embedded crystal SOIC (SOX28)
and deselects (write-protects) external
LPSRAM via chip-enable gate
V
battery/crystal top to be ordered separately
PFD
= 2.60V (nom)
SNAPHAT (SH) battery & crystal
28
Embedded crystal
SOH28 (MH)
SOX28 (MX)
SO
PFD
= 2.50V (nom)
1
®
M41ST85W
IC (SOH28) SNAPHAT
= 2.60V (nom)
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