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參數資料
| 型號： | FM75MM8X |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Low Voltage 2-Wire Digital Temperature Sensor with Thermal Alarm |
| 中文描述： | 低電壓2 - Wire數字溫度傳感器，熱報警器 |
| 文件頁數： | 9/15頁 |
| 文件大小： | 532K |
| 代理商： | FM75MM8X |
PRODUCT SPECIFICATION
FM75
REV. 1.0.5 10/2/03
9
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 TOS register is identical to that of the
Temperature 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
OS
Register are used by the thermal
alarm. For example, for 9-bit conversions the trip-point
temperature is defined 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
HYST
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 = Temperature MSB
T = Temperature data
9-bit LSB = Temperature LSB for 9-bit conversions
10-bit LSB = Temperature LSB for 10-bit conversions
11-bit LSB = Temperature LSB for 11-bit conversions
12-bit LSB = 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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