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M41T81S Datasheet(PDF) 9 Page - STMicroelectronics |
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M41T81S Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 32 page  M41T81S Operation Doc ID 10773 Rev 7 9/32 2 Operation The M41T81S 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 20 bytes contained in the device can then be accessed sequentially in the following order: 1. Tenths/hundredths of a second register 2. Seconds register 3. Minutes register 4. Century/hours register 5. Day register 6. Date register 7. Month register 8. Year register 9. Calibration register 10. Watchdog register 11 - 15. Alarm registers 16. Flags register 17 - 19. Reserved 20. Square wave register The M41T81S clock continually monitors VCC for an out-of-tolerance condition. Should VCC fall below VPFD, 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 a an out-of-tolerance system. Once VCC falls below the switchover voltage (VSO), the device automatically switches over to the battery and powers down into an ultra-low current mode of operation to preserve battery life. If VBAT is less than VPFD, the device power is switched from VCC to VBAT when VCC drops below VBAT. If VBAT is greater than VPFD, the device power is switched from VCC to VBAT when VCC drops below VPFD. Upon power-up, the device switches from battery to VCC at VSO. When VCC rises above VPFD, it will recognize the inputs. For more information on battery storage life refer to application note AN1012, "Predicting the battery life and data retention period of NVRAMs and serial RTCs" . 2-wire bus characteristics The bus is intended for communication between different ICs. It consists of two lines: a bi- directional data signal (SDA) and a clock signal (SCL). Both the SDA and SCL lines must be connected to a positive supply voltage via a pull-up resistor. |
Similar Part No. - M41T81S_12 |
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Similar Description - M41T81S_12 |
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