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参数资料
| 型号： | M41T93RMY6E |
| 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, PDSO18 |
| 封装： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOP-18 |
| 文件页数： | 26/49页 |
| 文件大小： | 719K |
| 代理商： | M41T93RMY6E |
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Clock operation
M41T93
Doc ID 12615 Rev 5
3.10
Battery low warning
The M41T93 automatically performs battery voltage monitoring upon power-up and at
factory-programmed time intervals of approximately 24 hours. The battery low (BL) bit, bit
D4 of flags register 0Fh, will be asserted if the battery voltage is found to be less than
approximately 2.5 V. The BL bit will remain asserted until completion of battery replacement
and subsequent battery low monitoring tests, either during the next power-up sequence or
the next scheduled 24-hour interval.
If a battery low is generated during a power-up sequence, this indicates that the battery is
below approximately 2.5 volts and may not be able to maintain data integrity. Clock data
should be considered suspect and verified as correct. A fresh battery should be installed.
If a battery low indication is generated during the 24-hour interval check, this indicates that
the battery is near end of life. However, data is not compromised due to the fact that a
nominal VCC is supplied. In order to insure data integrity during subsequent periods of
battery backup mode, the battery should be replaced.
The M41T93 only monitors the battery when a nominal VCC is applied to the device. Thus
applications which require extensive durations in the battery backup mode should be
powered-up periodically (at least once every few months) in order for this technique to be
beneficial. Additionally, if a battery low is indicated, data integrity should be verified upon
power-up via a checksum or other technique.
3.11
Century bits
These two bits will increment in a binary fashion at the turn of the century, and handle all
leap years correctly. See Table 12 for additional explanation.
3.12
Output driver pin
When the OFIE bit, A1IE bit, and watchdog register are not set to generate an interrupt, the
IRQ/FT/OUT pin becomes an output driver that reflects the contents of D7 of register 08h. In
other words, when D7 (OUT bit) is a '0,' then the IRQ/FT/OUT pin will be driven low.
Note:
The IRQ/FT/OUT pin is an open drain which requires an external pull-up resistor.
Table 12.
Century bits examples
CB0
CB1
Leap Year?
Example(1)
1.
Leap year occurs every four years (for years evenly divisible by four), except for years evenly divisible by
100. The only exceptions are those years evenly divisible by 400 (the year 2000 was a leap year, year
2100 is not).
00
Yes
2000
0
1
No
2100
1
0
No
2200
1
No
2300
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M41T93RMY6F | 功能描述:实时时钟 Serial SPI bus RTC 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 |
| M41T93RMY6F-CUT TAPE | 制造商:ST 功能描述:M41T93 Series 5.5 V Serial SPI Bus RTC with Battery Switchover - SOX-18 |
| M41T93RQA6E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Serial SPI bus RTC with battery switchover |
| M41T93RQA6F | 功能描述:实时时钟 SPI RTC 32.768 kHz 365nA 2.0V to 5.5V 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 |
| M41T93RQA6F-CUT TAPE | 制造商:ST 功能描述:M41T93 Series 5.5 V Serial SPI Bus RTC With Battery Switchover -QFN-16 |
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