M41T00S 串行访问的实时时钟
The M41T00S Serial Access TIMEKEEPER? SRAM is a low power serial RTC with a builtin 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 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 8 bytes contained in the device can then be accessed sequentially in the following order:
- Seconds register
- Minutes register
- Century/hours register
- Day register
- Date register
- Month register
- Year register
- Calibration register
The M41T00S 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.
M41T00S 订购型号:
| Ordering Model | Package | RoHS Compliance Grade | Marketing Status | Memory Organization | Supply Voltage(Vcc) | Supply Voltage(Vcc) | General Description | Operating Range | Battery Switchover(VSO) | Packing Type |
| min | max | |||||||||
| V | V | |||||||||
| M41T00SM6E | SO8 | Ecopack1 | Active | 64b (8 x 8) | 2 | 5.5 | Serial RTC | Industrial | Yes | Tube |
| M41T00SM6F | SO8 | Ecopack1 | Active | 64b (8 x 8) | 2 | 5.5 | Serial RTC | Industrial | Yes | Tape And Reel |
M41T00S 产品特性:
- 2.0 to 5.5 V clock operating voltage
- Counters for seconds, minutes, hours, day, date, month, year, and century
- Software clock calibration
- Automatic switchover and deselect circuitry(fixed reference)
– VCC = 2.7 to 5.5 V 2.5V ≤ VPFD ≤ 2.7 V - Serial interface supports I2C bus (400 kHz protocol)
- Low operating current of 300 μA
- Oscillator stop detection
- Battery or SuperCap? backup
- Operating temperature of –40 to 85°C
- Ultra-low battery supply current of 1 μA
M41T00S 技术支持与电子电路设计开发资源下载
- M41T00S 数据手册DataSheet下载.PDF
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