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M41ST85W Datenblatt(PDF) 1 Page - STMicroelectronics |
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M41ST85W Datenblatt(HTML) 1 Page - STMicroelectronics |
1 / 34 page 1/34 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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