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參數(shù)資料
| 型號(hào)： | FM75MM8 |
| 英文描述： | DIGITAL THERMOMETER|CMOS|TSSOP|8PIN |
| 中文描述： | 數(shù)字溫度計(jì)|的CMOS | TSSOP封裝| 8引腳 |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大小： | 2067K |
| 代理商： | FM75MM8 |
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8
F
www.fairchildsemi.com
FM75 Rev. A.4
Over-Limit-Signal Temperature Register (T
OS
)
The T
OS
Register is a two-byte (16-bit) read/write register that
stores the user-programmable upper trip-point temperature for
the thermal alarm in two
’
s-complement format. At power-up this
register defaults to 80
°
C (i.e., 0101 0000 0000 0000).
The format of the T
OS
register is identical to that of the Tempera-
ture Register (see Figure 6). The 4 LSBs of the T
OS
Register are
hardwired to zero, so data written to these register bits will be
ignored. The MSB position of the T
OS
Register contains the sign
bit for the digital temperature and bit 14 contains the temperature
MSB.
The resolution setting for the T-to-D conversion determines how
many bits of the T
Register are used by the thermal alarm. For
example, for 9-bit conversions the trip-point temperature is de-
fined by the 9 MSBs of the T
OS
register, and all remaining bits are
“
don
’
t cares.
”
Hysteresis Temperature Register (T
HYST
)
The T
HYST
Register is a two-byte (16-bit) read/write register that
stores the user programmable lower trip-point temperature for the
thermal alarm in two
’
s-complement format. At power-up this
register defaults to 75
°
C (i.e., 0100 1011 0000 0000).
The T
HYST
register is illustrated in Figure 6. The format of this
register is the same as that of the Temperature Register. The 4
LSBs of the T
register are hardwired to zero, so data written
to these bits is ignored.
The resolution setting for the T-to-D conversion determines how
many bits of the T
HYST
Register are used by the thermal alarm. For
example, for 9-bit conversions the hysteresis temperature is
defined by the 9 MSBs of the T
HYST
Register, and all remaining bits
are "don't cares."
SB = Two's complement sign bit
TMSB = Hysteresis temperature MSB
T = Temperature data
9-bit LSB = Hysteresis temperature LSB for 9-bit conversions
10-bit LSB = Hysteresis temperature LSB for 10-bit conversions
11-bit LSB = Hysteresis temperature LSB for 11-bit conversions
12-bit LSB = Hysteresis temperature LSB for 12-bit conversions
Figure 6. T
HYST
Register and T
OS
Register Format
SB
TMSB
T
T
T
T
T
T
MSB
8
14
13
12
11
10
9
9-bit
LSB
0
0
0
0
7
LSB
6
5
4
3
2
1
10-bit
LSB
11-bit
LSB
12-bit
LSB
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