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参数资料
| 型号： | M41ST84W-85MH6TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | 0.330 INCH, SNAPHAT, PLASTIC, SOH-28 |
| 文件页数： | 14/32页 |
| 文件大小： | 168K |
| 代理商： | M41ST84W-85MH6TR |
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M41ST84Y, M41ST84W
Output Driver Pin
When the FT bit, AFE bit and watchdog register
are not set, the IRQ/FT/OUT pin becomes an out-
put driver that reflects the contents of D7 of the
Control Register. In other words, when D6 of loca-
tion 08h is a ‘0’, D7 of location 08h and 0Ah and
the watchdog register are a ‘0’ then the IRQ/FT/
OUT pin will be driven low.
Note: The IRQ/FT/OUT pin is an open drain which
requires an external pull-up resistor.
Initial Power-on Defaults
Upon initial application of power to the device, the
following register bits are set to a ‘0’ state: Watch-
dog Register; FT; AFE; ABE and SQWE. The fol-
lowing bits are set to a ‘1’ state: ST; OUT; and HT.
Century Bit
Bits D7 and D6 of Clock Register 03h contain the
CENTURY ENABLE Bit (CEB) and the CENTURY
Bit (CB). Setting CEB to a “1” will cause CB to tog-
gle, either from a “0” to “1” or from “1” to “0” at the
turn of the century (depending upon its initial
state). If CEB is set to a “0”, CB will not toggle.
Figure 17. Crystal Accuracy Across Temperature
Figure 18. Clock Calibration
AI00999
–160
0
1020304050
6070
Frequency (ppm)
Temperature
°C
80
–10
–20
–30
–40
–100
–120
–140
–40
–60
–80
20
0
–20
F
= -0.038
(T - T
0)
2 ± 10%
F
ppm
C2
T
0 =25 °C
AI00594B
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION
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