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参数资料
| 型号： | DS75U/T&R |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, SQUARE, SURFACE MOUNT |
| 封装： | MICRO MAX PACKAGE-8 |
| 文件页数： | 14/15页 |
| 文件大小： | 338K |
| 代理商： | DS75U/T&R |
DS75
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compared to the values in the TOS and THYST registers, and then O.S. is updated based on the result of the
comparison and the operating mode. The number of TOS and THYST bits used during the thermostat
comparison is equal to the conversion resolution set by the R1 and R0 bits in the configuration register.
For example, it the resolution is 9 bits, only the 9 MSbs of TOS and THYST will be used by the thermostat
comparator.
The active state of the O.S. output can be changed via the POL bit in the configuration register. The
power-up default is active low.
If the user does not wish to use the thermostat capabilities of the DS75, the O.S. output should be left
floating. Note that if the thermostat is not used, the TOS and THYST registers can be used for general
storage of system data.
Comparator Mode — When the thermostat is in comparator mode, O.S. can be programmed to operate
with any amount of hysteresis. The O.S. output becomes active when the measured temperature exceeds
the TOS value a consecutive number of times as defined by the F1 and F0 fault tolerance (FT) bits in the
configuration register. O.S. then stays active until the first time the temperature falls below the value
stored in THYST. Putting the device into shutdown mode does not clear O.S. in comparator mode.
Thermostat comparator mode operation with FT = 2 is illustrated in Figure 4.
Interrupt Mode — In interrupt mode, the O.S. output first becomes active when the measured
temperature exceeds the TOS value a consecutive number of times equal to the FT value in the
configuration register. Once activated, O.S. can only be cleared by either putting the DS75 into shutdown
mode or by reading from any register (temperature, configuration, TOS, or THYST ) on the device. Once
O.S. has been deactivated, it will only be reactivated when the measured temperature falls below the
THYST value a consecutive number of times equal to the FT value. Again, O.S can only be cleared by
putting the device into shutdown mode or reading any register. Thus, this interrupt/clear process is
cyclical between TOS and THYST events (i.e, TOS, clear, THYST, clear, TOS, clear, THYST, clear, etc.).
Thermostat interrupt mode operation with FT = 2 is illustrated in Figure 4.
Figure 4. O.S. OUTPUT OPERATION EXAMPLE
In this example the DS75
is configured to have a
fault tolerance of 2.
O.S. Output - Comparator Mode
Conversions
Inactive
Active
Temperature
TOS
THYST
Inactive
Active
O.S. Output - Interrupt Mode
Assumes a read
has occurred
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