參數(shù)資料
型號(hào)： M41T94MQ6E
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, PDSO16
封裝： ROHS COMPLIANT, PLASTIC, SOIC-16
文件頁(yè)數(shù)： 17/41頁(yè)
文件大?。?/td> 352K
代理商： M41T94MQ6E
Clock operations
M41T94
Therefore, each calibration step has the effect of adding 512 or subtracting 256 oscillator
cycles for every 125,829,120 actual oscillator cycles, that is +4.068 or –2.034 ppm of
adjustment per calibration step in the calibration register. Assuming that the oscillator is
running at exactly 32,768 Hz, each of the 31 increments in the calibration byte would
represent +10.7 or –5.35 seconds per month which corresponds to a total range of +5.5 or
–2.75 minutes per month.
Two methods are available for ascertaining how much calibration a given M41T94 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. Calibration values,
including the number of seconds lost or gained in a given period, can be found in application
note AN934: TIMEKEEPER calibration. 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 the calibration byte.
The second approach is better suited to a manufacturing environment, and involves the use
of the IRQ/FT/OUT pin. The pin will toggle at 512 Hz, when the stop bit (ST, D7 of 1h) is '0,'
the frequency test bit (FT, D6 of 8h) is '1,' the alarm flag enable bit (AFE, D7 of Ah) is '0,' and
the watchdog steering bit (WDS, D7 of 9h) is '1' or the watchdog register (9h = 0) is reset.
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 a –10 (XX001010) to be loaded into the calibration byte
for correction.
Note:
Setting or changing the calibration byte does not affect the frequency test output frequency.
The IRQ/FT/OUT pin is an open drain output which requires a pull-up resistor for proper
operation. A 500 to 10 k
Ω resistor is recommended in order to control the rise time. The FT
bit is cleared on power-down.
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M41T94MQ6F 功能描述:實(shí)時(shí)時(shí)鐘 Serial 512 (64x8) 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
M41T94MQ6TR 功能描述:實(shí)時(shí)時(shí)鐘 Advanced Analog 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
M41T94SH 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:512 Bit 64 bit x8 SERIAL RTC SPI SRAM
M41TC8025 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Highly accurate, temperature-compensated serial real-time clock (RTC) with embedded crystal
M41TC8025AMC6F 制造商:STMicroelectronics 功能描述:Real Time Clock Serial 14-Pin SOIC T/R 制造商:STMicroelectronics 功能描述:HIGH-END SENSOR AND ANALOG - Tape and Reel 制造商:STMicroelectronics 功能描述:HIGH-END SENSOR and ANALOG
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