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M41ST85W Datenblatt(PDF) 1 Page - STMicroelectronics

Teilenummer M41ST85W
Bauteilbeschribung  3.0/3.3V I2C Combination Serial RTC, NVRAM Supervisor and Microprocessor Supervisor
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41ST85W Datenblatt(HTML) 1 Page - STMicroelectronics

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January 2006
M41ST85W
3.0/3.3V I2C Combination Serial RTC, NVRAM
Supervisor and Microprocessor Supervisor
Rev 8.0
KEY 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 COMPLIANCE
Lead-free components are compliant with the
RoHS Directive.
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
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
Early Power-fail Warning circuit (PFI/PFO)
with 1.25V Precision Reference
Figure 1. 28-pin SOIC Package
Figure 2. 28-pin (300mil) SOIC Package
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 Batter/Crystal top to be
ordered separately.
28-lead Embedded Crystal SOIC
(SOX28)
28
1
SOH28 (MH)
SNAPHAT (SH)
Battery & Crystal
SOX28 (MX)
EMBEDDED Crystal


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