参数资料
型号: M41T83ZM6F
厂商: STMICROELECTRONICS
元件分类: 时钟/数据恢复及定时提取
英文描述: 1 TIMER(S), REAL TIME CLOCK, PDSO8
封装: 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
文件页数: 4/61页
文件大小: 983K
代理商: M41T83ZM6F
Operation
M41T82-M41T83
Doc ID 12578 Rev 12
2
Operation
The M41T8x clock operates as a slave device on the serial bus. Access is obtained by
implementing a start condition followed by the correct slave address (D0h). The 32 bytes
contained in the device can then be accessed sequentially in the following order:
1st byte: tenths/hundredths of a second register
2nd byte: seconds register
3rd byte: minutes register
4th byte: century/hours register
5th byte: day register
6th byte: date register
7th byte: month register
8th byte: year register
9th byte: digital calibration register
10th byte: watchdog register
11th - 15th bytes: alarm 1 registers
16th byte: flags register
17th byte: timer value register
18th byte: timer control register
19th byte: analog calibration register
20th byte: square wave register
21st - 25th bytes: alarm 2 registers
26th - 32nd bytes: user RAM
The M41T8x clock continually monitors VCC for an out-of-tolerance condition. Should VCC
fall below VRST, the device terminates an access in progress and resets the device address
counter. Inputs to the device will not be recognized at this time to prevent erroneous data
from being written to the device from an out-of-tolerance system. The power input will also
be switched from the VCC pin to the battery when VCC falls below the battery back-up
switchover voltage (VSO = VRST). At this time the clock registers will be maintained by the
attached battery supply. As system power returns and VCC rises above VSO, the battery is
disconnected, and the power supply is switched to external VCC.
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