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M41ST85W 데이터시트(HTML) 1 Page - STMicroelectronics

부품명 M41ST85W
상세내용  3.0/3.3V I2C combination serial RTC, NVRAM supervisor and microprocessor supervisor
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제조사  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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M41ST85W 데이터시트(HTML) 1 Page - STMicroelectronics

 
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October 2007
Rev 9
1/41
1
M41ST85W
3.0/3.3V I2C combination serial RTC, NVRAM
supervisor and microprocessor supervisor
Features
Automatic battery switchover and WRITE
protect for:
– Internal serial RTC and
– External low power SRAM (LPSRAM)
400kHz I2C serial interface
3.0/3.3V operating voltage
–VCC = 2.7 to 3.6V
Ultra-low battery supply current of 500nA (max)
RoHS compliant
– Lead-free second level interconnect
Serial RTC features
400kHz I2C
44 bytes of general purpose NVRAM
Counters for:
– Seconds, minutes, hours, day, date, month,
and year
–Century
– 10ths/100ths of seconds
– Clock calibration register allows
compensation for crystal variations over
temperature
Programmable alarm with repeat modes
– Functions in battery back-up mode
Power-down timestamp (HT Bit)
2.5 to 5.5V oscillator operating voltage
Microprocessor supervisor features
Programmable watchdog
– 62.5ms to 128s time-out period
Early power-fail warning circuit (PFI/PFO) with
1.25V precision reference
Power-on reset/low voltage detect
– Open drain reset output
– Reset voltage, VPFD = 2.60V (nom)
– Two reset input pins
– Watchdog can be steered to reset output
NVRAM supervisor features
Non-volatizes external LPSRAM
– Automatically switches to back-up battery
and deselects (write-protects) external
LPSRAM via chip-enable gate
– Power-fail deselect (write protect) voltage,
VPFD = 2.60V (nom)
–Switchover , VSO = 2.50V (nom)
Battery monitor (battery low flag)
Other features
Programmable squarewave generator (1Hz to
32KHz)
–40°C to +85°C Operation
Package options:
– 28-lead SNAPHAT® IC (SOH28) SNAPHAT
battery/crystal top to be ordered separately
– 28-lead embedded crystal SOIC (SOX28)
28
1
SNAPHAT (SH) battery & crystal
SOH28 (MH)
Embedded crystal
SOX28 (MX)
www.st.com


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