參數(shù)資料
型號(hào)： M41T82SM6F
廠商： STMICROELECTRONICS
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： 1 TIMER(S), REAL TIME CLOCK, PDSO8
封裝： 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
文件頁(yè)數(shù)： 18/61頁(yè)
文件大?。?/td> 983K
代理商： M41T82SM6F
M41T82-M41T83
Clock operation
Doc ID 12578 Rev 12
3.3
Real-time clock accuracy
The M41T8x 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 17 on page 30).
The M41T8x 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
CXO (see Figure 16), are selectable from a range of –18 pF to +9.75 pF in steps of
0.25 pF. 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 Section 3.4.1:
Figure 16.
Internal load capacitance adjustment
AI11804
XO
XI
Crystal Oscillator
CXI
CXO
相關(guān)PDF資料
PDF描述
M41T82ZM6E 1 TIMER(S), REAL TIME CLOCK, PDSO8
M41T83RM6E 1 TIMER(S), REAL TIME CLOCK, PDSO8
M41T83SQA6E 1 TIMER(S), REAL TIME CLOCK, QCC16
M41T83SQA6F 1 TIMER(S), REAL TIME CLOCK, QCC16
M41T83RQA6F 1 TIMER(S), REAL TIME CLOCK, QCC16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M41T82SMY6E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
M41T82SMY6F 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
M41T82SQ6E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
M41T82SQ6F 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
M41T82SQA6E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial I2C bus RTC with battery switchover
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