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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： | 15/49页 |
| 文件大小： | 719K |
| 代理商： | M41T93RMY6E |
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Clock operation
M41T93
Doc ID 12615 Rev 5
3.4.2
Analog calibration (programmable load capacitance)
A second method of calibration employs the use of programmable internal load capacitors to
adjust (or trim) the oscillator frequency.
By design, the oscillator is intended to be 0 ppm ± crystal accuracy at room temperature
(25 °C, see Figure 10 on page 23). For a 12.5 pF crystal, the default loading on each side of
the crystal will be 25 pF. For incrementing or decrementing the calibration value,
capacitance will be added or removed in increments of 0.25 pF to each side of the crystal.
Internally, CLOAD of the oscillator is changed via two digitally controlled capacitors, CXI and
on-chip series load capacitance, CLOAD, ranges from 3.5 pF to 17.4 pF, with a nominal value
of 12.5 pF (AC0-AC6 = ‘0’).
The effective series load capacitance (CLOAD) is the combination of CXI and CXO:
Seven analog calibration bits, AC0 to AC6, are provided in order to adjust the on-chip load
capacitance value for frequency compensation of the RTC. Each bit has a different weight
for capacitance adjustment. An analog calibration sign (ACS) bit determines if capacitance
is added (ACS bit = ‘0,’ negative calibration) or removed (ACS bit = ‘1,’ positive calibration).
The majority of the calibration adjustment is positive (i.e. to increase the oscillator frequency
by removing capacitance) due to the typical characteristic of quartz crystals to slow down
due to changes in temperature, but negative calibration is also available.
Since the analog calibration register adjustment is essentially “pulling” the frequency of the
oscillator, the resulting frequency changes will not be linear with incremental capacitance
changes. The equations which govern this mechanism indicate that smaller capacitor values
of analog calibration adjustment will provide larger increments. Thus, the larger values of
analog calibration adjustment will produce smaller incremental frequency changes. These
values typically vary from 6-10 ppm/bit at the low end to <1 ppm/bit at the highest
capacitance settings. The range provided by the analog calibration register adjustment with
a typical surface mount crystal is approximately ±30 ppm around the AC6-AC0 = 0 default
setting because of this property (see Table 5 on page 23).
C
LOAD
11 C
XI
1C
XO
+
()
=
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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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