M41ST85WMH6F datasheet(1/34 Pages) STMICROELECTRONICS

部件名	M41ST85WMH6F

功能描述	3.0/3.3V I2C Combination Serial RTC, NVRAM Supervisor and Microprocessor Supervisor

PDF	34 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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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

类似零件编号 - M41ST85WMH6F

制造商	部件名	数据表	功能描述
STMicroelectronics	M41ST85WMH6F	369Kb / 41P	3.0/3.3V I2C combination serial RTC, NVRAM supervisor and microprocessor supervisor 03-Oct-2007
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