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參數(shù)資料
| 型號： | M41T94MQ6TR |
| 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： | PLASTIC, SOIC-16 |
| 文件頁數(shù)： | 17/40頁 |
| 文件大小： | 328K |
| 代理商： | M41T94MQ6TR |
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Clock operations
M41T94
Figure 13.
RSTIN1 and RSTIN2 timing Waveforms
4.8
Calibrating the clock
The M41T94 is driven by a quartz-controlled oscillator with a nominal frequency of
32,768Hz. Uncalibrated clock accuracy will not exceed ±35 ppm (parts per million) oscillator
frequency error at 25°C, which equates to about ±1.53 minutes per month. 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 (see Figure 14 on page 26).
Therefore, the M41T94 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 15 on page 26. The number of times pulses are blanked (subtracted,
negative calibration) or split (added, positive calibration) depends upon the value loaded into
the five Calibration bits found in the Control 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 Control register (8h).
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.
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
Table 7.
Reset AC characteristics(1)
1.
Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 2.7 to 5.5V (except where noted).
Symbol
Parameter
Min
Max
Unit
tRLRH1
(2)
2.
Pulse width less than 50ns will result in no RESET (for noise immunity).
RSTIN1 low to RSTIN1 high
200
ns
tRLRH2
(3)
3.
Pulse width less than 20ms will result in no RESET (for noise immunity).
RSTIN2 low to RSTIN2 high
100
ms
tR1HRH
(4)
4.
Programmable (see Table on page 28).
RSTIN1 high to RST high
40
200
ms
tR2HRH
RSTIN2 high to RST high
40
200
ms
AI03665
RSTIN2
RST
(1)
RSTIN1
tRLRH1
tRLRH2
tR1HRH
tR2HRH
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