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| 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： | 11/49页 |
| 文件大小： | 719K |
| 代理商： | M41T93RMY6E |
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M41T93
Clock operation
Doc ID 12615 Rev 5
3.3
Real-time clock accuracy
The M41T93 is driven by a quartz controlled oscillator with a nominal frequency of
32,768 Hz. The accuracy of the real-time clock is dependent upon the accuracy of the
crystal, and the match between the capacitive load of the oscillator circuit and the capacitive
load for which the crystal was trimmed. Temperature also affects the crystal frequency,
causing additional error (see Figure 10 on page 23).
The M41T93 provides the option of clock correction through either manufacturing calibration
or in-application calibration. The total possible compensation is typically –93 ppm to +156
ppm. The two compensation circuits that are available are:
1.
An analog calibration register (12h) can be used to adjust internal (on-chip) load
capacitors for oscillator capacitance trimming. The individual load capacitors CXI and
0.25pF. This translates to a calculated compensation of approximately ±30 ppm (see
2.
A digital calibration register (08h) can also be used to adjust the clock counter by
adding or subtracting a pulse at the 512 Hz divider stage. This approach provides
periodic compensation of approximately –63 ppm to +126 ppm (see Digital calibration
Figure 9.
Internal load capacitance adjustment
AI11804
XO
XI
Crystal Oscillator
CXI
CXO
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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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