參數(shù)資料
型號(hào)： M41T83ZQA6F
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, QCC16
封裝： 4 X 4 MM, ROHS COMPLIANT, QFN-16
文件頁(yè)數(shù)： 26/61頁(yè)
文件大小： 983K
代理商： M41T83ZQA6F
Clock operation
M41T82-M41T83
Doc ID 12578 Rev 12
Two methods are available for ascertaining how much calibration a given M41T8x may
require:
●
The first involves setting the clock, letting it run for a month and comparing it to a known
accurate reference and recording deviation over a fixed period of time. This allows the
designer to give the end user the ability to calibrate the clock as the environment
requires, even if the final product is packaged in a non-user serviceable enclosure. The
designer could provide a simple utility that accesses either or both of the calibration
bytes.
●
The second approach is better suited to a manufacturing environment, and uses the
512 Hz frequency test output. This is the IRQ1/FT/OUT pin on the M41T83, and the
FT/RST pin on the M41T82 (see Section 3.14 and Section 3.15 for more information on
enabling the FT output). The 512 Hz frequency test signal can be measured using a
highly accurate timing device such as a frequency counter. The measured value is then
compared to 512 Hz and the oscillator error in ppm is then determined.
Any deviation from 512 Hz indicates the degree and direction of oscillator frequency
shift at the test temperature. For example, a reading of 512.010124 Hz would indicate a
+20 ppm oscillator frequency error, requiring either a –10 (xx001010) to be loaded into
the digital calibration byte, or +6 pF (00011000) into the analog calibration byte for
correction.
Note:
Setting or changing the digital calibration byte does not affect the frequency test, square
wave, or watchdog timer frequency, but changing the analog calibration byte DOES affect all
functions derived from the low current oscillator (see Figure 19).
Figure 19.
Clock divider chain and calibration circuits
AI11806c
Analog Calibration
Circuitry
Remainder of
Divider Circuit
1Hz Signal
512Hz Output
Frequency Test
32KHz
Low Current
Oscillator
CXI
CXO
÷64
÷2
Digital Calibration Circuitry
(divide by 511/512/513)
Clock
Counters
Square Wave
Watchdog Timer
8-bit Timer
相關(guān)PDF資料
PDF描述
M41T82SM6E 1 TIMER(S), REAL TIME CLOCK, PDSO8
M41T83ZMY6E 1 TIMER(S), REAL TIME CLOCK, PDSO18
M41T83ZMY6F 1 TIMER(S), REAL TIME CLOCK, PDSO18
M41T82SM6F 1 TIMER(S), REAL TIME CLOCK, PDSO8
M41T82ZM6E 1 TIMER(S), REAL TIME CLOCK, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M41T93 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial SPI bus RTC with battery switchover
M41T93_07 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial SPI bus RTC with battery switchover
M41T93_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial SPI bus RTC with battery switchover
M41T93_11 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial SPI bus real-time clock with battery switchover
M41T93RMY6E 功能描述:實(shí)時(shí)時(shí)鐘 Serial SPI bus RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
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