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M41ST87W Datasheet(PDF) 5 Page - STMicroelectronics |
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M41ST87W Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 42 page 5/42 M41ST87Y, M41ST87W SUMMARY DESCRIPTION The M41ST87Y/W Serial TIMEKEEPER®/Con- troller SRAM is a low power 1280-bit, static CMOS SRAM organized as 160 bytes by 8 bits. A built-in 32.768 kHz oscillator (internal crystal-controlled) and 8 bytes of the SRAM (see Table 7., page 25) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 11 bytes of RAM provide calibration, status/control of Alarm, Watchdog, Tamper, and Square Wave functions. 8 bytes of ROM and final- ly 128 bytes of User RAM are also provided. Ad- dresses and data are transferred serially via a two line, bi-directional I2C interface. The built-in ad- dress register is incremented automatically after each WRITE or READ data byte. The M41ST87Y/ W has a built-in power sense circuit which detects power failures and automatically switches to the battery supply when a power failure occurs. The energy needed to sustain the SRAM and clock op- erations can be supplied by a small lithium button- cell supply when a power failure occurs. Functions available to the user include a non-vol- atile, time-of-day clock/calendar, Alarm interrupts, Tamper Detection, Watchdog Timer, and pro- grammable Square Wave output. Other features include a Power-On Reset as well as two addition- al debounced inputs (RSTIN1 and RSTIN2) which can also generate an output Reset (RST). The eight clock address locations contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of a second in 24 hour BCD for- mat. Corrections for 28, 29 (leap year), 30 and 31 day months are made automatically. Security Features Two fully independent Tamper Detection Inputs al- low monitoring of multiple locations within the sys- tem. Programmable bits provide both, “Normally Open” and “Normally Closed” switch monitoring. Time Stamping of the tamper event is automatical- ly provided. There is also an option allowing data stored in either internal memory (128 bytes), and/ or external memory to be cleared, protecting sen- sitive information in the event tampering occurs. By embedding the 32kHz crystal in the package, the clock is completely isolated from external tam- pering. An Oscillator Fail Bit (OF) is also provided to ensure correct operation of the oscillator. The M41ST87Y/W is supplied in a 28-pin, 300mil SOIC package (MX) which includes an embedded 32kHz crystal. The SOIC package is shipped in plastic anti-static tubes or in Tape & Reel form. The 300mil, embedded crystal SOIC requires only a user-supplied battery to provide non-volatile op- eration. |
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