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參數資料
| 型號： | FM75 |
| 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： | 6/15頁 |
| 文件大小： | 532K |
| 代理商： | FM75 |
FM75
PRODUCT SPECIFICATION
6
REV. 1.0.5 10/2/03
Comparator Mode
In Comparator Mode, each time a temperature-to-digital
(T-to-D) temperature conversion occurs, the new digital tem-
perature is compared to the value stored in the T
T
HYST
registers. If a fault tolerance number of consecutive
temperature measurements are greater than the value stored
in the T
OS
register, the O.S. output will be activated.
For example, if bits F1 and F0 are equal to “10” (fault
tolerance = 4), four consecutive temperature measurements
must exceed T
OS
to activate the O.S. output. Once the O.S
output is active, it will remain active until the first time the
measured temperature drops below the temperature stored in
the T
HYST
register. The operation of the alarm in Comparator
Mode with fault tolerance=2 is illustrated in Figure 1.
OS
and
Interrupt Mode
In Interrupt Mode the O.S. output will first become active
after a fault tolerance number of consecutive temperature
measurements exceed the value stored in the T
(similar to Comparator Mode). Once O.S. is active, it can
only be cleared by a user read from any of the FM75
registers (Temperature, Configuration, T
putting the FM75 into Shutdown Mode (i.e., by setting the
shutdown bit in the Configuration Register to “1”). Once
cleared, the O.S. output can only be activated the next time
by a fault tolerance number of consecutive temperature
measurements that are lower than the value stored in T
Again, once it is activated the O.S. output can only be
deactivated by a user read or shutdown. Thus, in Interrupt
Mode the activate/clear cycle for O.S. has the following
pattern: temperature > T
OS
, clear, temperature < T
clear, temperature > T
OS
, clear, etc. The operation of the
alarm in Interrupt Mode with fault tolerance=2 is also
illustrated in Figure 1.
OS
register
OS
, or T
HYST
) or by
HYST
.
HYST
,
Figure 1. Thermal Alarm Operation in Comparator and Interrupt Modes
For this example:
Fault Tolerance = 2
Output Polarity = Active Low
Read (or Shutdown)
T
OS
T
HYST
Temperature-to-Digital
Conversion
O.S. (Comparator Mode)
O.S. (Interrupt Mode)
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