- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄45049 > M41T00M6F (STMICROELECTRONICS) REAL TIME CLOCK, PDSO8 PDF資料下載
參數(shù)資料
| 型號(hào)： | M41T00M6F |
| 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： | REAL TIME CLOCK, PDSO8 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 7/25頁 |
| 文件大小： | 202K |
| 代理商： | M41T00M6F |
M41T00
M41T00 clock operation
3.1
Clock calibration
The M41T00 is driven by a quartz controlled oscillator with a nominal frequency of
32768 Hz. The devices are tested not to exceed 35 ppm (parts per million) oscillator
frequency error at 25°C, which equates to about ±1.53 minutes per month. With the
calibration bits properly set, the accuracy of each M41T00 improves to better than ±2 ppm
at 25 °C.
The oscillation rate of any crystal changes with temperature (see Figure 12). Most clock
chips compensate for crystal frequency and temperature shift error with cumbersome trim
capacitors. The M41T00 design, however, 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 13. The number of times pulses are blanked (subtracted,
negative calibration) or split (added, positive calibration) depends upon the value loaded into
the five-bit calibration byte found in the control register. Adding counts speeds the clock up,
subtracting counts slows the clock down.
The calibration byte occupies the five lower order bits (D4-D0) in the control register (addr
7). This byte 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 64minute 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.
Table 5.
Register map(1)
1.
Keys:
S = sign bit
FT = frequency test bit
ST = stop bit
OUT = output level
X = don’t care
CEB = century enable bit
CB = century bit
Address
Data
Function/range
BCD format
D7
D6
D5
D4
D3
D2
D1
D0
0
ST
10 seconds
Seconds
00-59
1
X
10 minutes
Minutes
00-59
2
CEB(2)
2.
When CEB is set to '1', CB will toggle from '0' to '1' or from '1' to '0' at the turn of the century (dependent
upon the initial value set).When CEB is set to '0', CB will not toggle.
CB
10 hours
Hours
Century/hours
0-1/00-23
3X
X
Day
01-07
4
X
10 date
Date
01-31
5
X
10 M.
Month
01-12
6
10 Years
Years
Year
00-99
7
OUT
FT
S
Calibration
Control
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M41T00M6E | REAL TIME CLOCK, PDSO8 |
| M41T00M6 | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| M41T0DS6 | REAL TIME CLOCK, PDSO8 |
| M41T0DS6T | REAL TIME CLOCK, PDSO8 |
| M41T0M6T | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M41T00M6F-CUT TAPE | 制造商:ST 功能描述:M41T00 Series 2 - 5.5 V 32 kHz Serial I2C Real Time Clock - SOIC-8 |
| M41T00S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial access real-time clock |
| M41T00S_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial access real-time clock |
| M41T00SC64 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Real-Time Clock + 64Kbit (8192 x 8) EEPROM |
| M41T00SC64MY6E | 功能描述:電可擦除可編程只讀存儲(chǔ)器 SERIAL REAL TIME CLOCK 64Kb 電可擦除可編程只讀存儲(chǔ)器 RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。