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M41ST85WMX6 Datasheet(PDF) 1 Page - STMicroelectronics |
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M41ST85WMX6 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 41 page 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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