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參數(shù)資料
| 型號(hào)： | M41T00SM6F |
| 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： | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SO-8 |
| 文件頁數(shù)： | 6/26頁 |
| 文件大小： | 225K |
| 代理商： | M41T00SM6F |
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Clock operation
M41T00S
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 (see Figure 11 on page 15).
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 M41T00S 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 FT/OUT pin. The pin will toggle at 512Hz, when the Stop bit (ST, D7 of 00h) is '0,' and
the Frequency Test bit (FT, D6 of 07h) is '1.'
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 that setting or changing the Calibration Byte does not affect the
frequency test output frequency.
The FT/OUT pin is an open drain output which requires a pull-up resistor to VCC for proper
operation. A 500-10k resistor is recommended in order to control the rise time. The FT bit is
cleared on power-down.
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| M41T0DS6E | REAL TIME CLOCK, PDSO8 |
| M41T256YMH7TR | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M41T00SM6F-CUT TAPE | 制造商:ST 功能描述:M41TSM Series 2.7 to 5.5 V Serial I2C Real Time Clock Surface Mount - SOIC-8 |
| M41T01M6F | 制造商:STMicroelectronics 功能描述:REAL TIME CLOCKS 制造商:STMicroelectronics 功能描述:IC RTC SERIAL LP 8SOIC |
| M41T0DS6E | 功能描述:實(shí)時(shí)時(shí)鐘 Serial 64 (8x8) 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 |
| M41T0DS6F | 功能描述:實(shí)時(shí)時(shí)鐘 Low Power Serial 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 |
| M41T0DS6T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SERIAL REAL-TIME CLOCK |
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