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參數(shù)資料
| 型號： | M41T00SM6F |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 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)： | 5/26頁 |
| 文件大?。?/td> | 225K |
| 代理商： | M41T00SM6F |
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M41T00S
Clock operation
Table 2.
TIMEKEEPER register map
Keys:
0 = must be set to '0'
CB = century bit
CEB = century enable bit
FT = frequency test bit
OF = oscillator fail bit
OUT = output level
S = sign bit
ST = stop bit
3.2
Calibrating the clock
The M41T00S is driven by a quartz-controlled oscillator with a nominal frequency of 32,768
Hz. The devices are tested not exceed ±35 ppm (parts per million) oscillator frequency error
When the calibration circuit is properly employed, accuracy improves to better than ±2 ppm
at 25°C.
The oscillation rate of crystals changes with temperature. The M41T00S design employs
periodic counter correction. The calibration circuit adds or subtracts counts from the
oscillator divider circuit at the divide by 256 stage, as shown in Figure 11 on page 15. The
number of times pulses which are blanked (subtracted, negative calibration) or split (added,
positive calibration) depends upon the value loaded into the five calibration bits found in the
calibration register. Adding counts speeds the clock up, subtracting counts slows the clock
down.
The calibration bits occupy the five lower order bits (D4-D0) in the calibration register 07h.
These bits can be set to represent any value between 0 and 31 in binary form. Bit D5 is a
Sign bit; '1' indicates positive calibration, '0' indicates negative calibration. Calibration occurs
within a 64 minute cycle. The first 62 minutes in the cycle may, once per minute, have one
second either shortened by 128 or lengthened by 256 oscillator cycles. If a binary '1' is
loaded into the register, only the first 2 minutes in the 64 minute cycle will be modified; if a
binary 6 is loaded, the first 12 will be affected, and so on.
Addr
Function/range BCD format
D7
D6
D5
D4
D3
D2
D1
D0
00h
ST
10 seconds
Seconds
00-59
01h
OF
10 minutes
Minutes
00-59
02h
CEB
CB
10 hours
Hours (24-hour format)
Century/hours
0-1/00-23
03h
0000
0
Day of week
Day
01-7
04h
0
10 date
Date: day of month
Date
01-31
05h
0
10M
Month
01-12
06h
10 years
Year
00-99
07h
OUT
FT
S
Calibration
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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:實時時鐘 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 時間格式:HH:MM:SS RTC 存儲容量: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:實時時鐘 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 時間格式:HH:MM:SS RTC 存儲容量: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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