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M41T00SM6F Datasheet(PDF) 5 Page - STMicroelectronics |
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M41T00SM6F Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 26 page M41T00S Description 5/26 1 Description The M41T00S Serial Access TIMEKEEPER® SRAM is a low power serial RTC with a built- in 32.768 kHz oscillator (external crystal controlled). Eight bytes of the SRAM (see Table 2 on page 13) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. Addresses and data are transferred serially via a two line, bidirectional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte. The M41T00S 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 clock operations can be supplied by a small lithium button supply when a power failure occurs. The eight clock address locations contain the century, year, month, date, day, hour, minute, and second in 24-hour BCD format. Corrections for 28, 29 (leap year - valid until year 2100), 30 and 31 day months are made automatically. The M41T00S is supplied in an 8-pin SOIC. Figure 1. Logic diagram Table 1. Signal names XI Oscillator input XO Oscillator output FT/OUT Frequency test / output driver (open drain) SDA Serial data input/output SCL Serial clock input VBAT Battery supply voltage VCC Supply voltage VSS Ground SCL VCC M41T00S VSS SDA FT/OUT VBAT XI XO AI09165 |
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