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参数资料
| 型号： | M41T81M6E |
| 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, LEAD FREE, PLASTIC, SOIC-8 |
| 文件页数： | 27/29页 |
| 文件大小： | 454K |
| 代理商： | M41T81M6E |
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M41T81
Operation
Doc ID 7529 Rev 10
2
Operation
The M41T81 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:
●
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: control register
●
10th byte: watchdog register
●
11th - 16th bytes: alarm registers
●
17th - 19th bytes: reserved
●
20th byte: square wave register
The M41T81 clock continually monitors VCC for an out-of-tolerance condition. Should VCC
fall below VSO, 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. The device also
automatically switches over to the battery and powers down into an ultra low current mode
of operation to conserve battery life. As system power returns and VCC rises above VSO, the
battery is disconnected, and the power supply is switched to external VCC.
For more information on battery storage life refer to application note AN1012.
2.1
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.
The following protocol has been defined:
●
Data transfer may be initiated only when the bus is not busy.
●
During data transfer, the data line must remain stable whenever the clock line is high.
●
Changes in the data line, while the clock line is high, will be interpreted as control
signals.
Accordingly, the following bus conditions have been defined:
2.1.1
Bus not busy
Both data and clock lines remain high.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M41T81M6F | 功能描述:实时时钟 Serial 512 (64x8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| M41T81M6F-CUT TAPE | 制造商:ST 功能描述:M41T Series 2 V Serial I2C Real Time Clock with Alarm - SOIC-8 |
| M41T81M6TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Serial Access Real-Time Clock with Alarms |
| M41T81MX | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:SERIAL ACCESS RTC WITH ALARMS |
| M41T81MX6 | 功能描述:实时时钟 Serial 512 (64x8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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