參數(shù)資料
型號(hào)： STDS75M2E
廠商： 意法半導(dǎo)體
元件分類(lèi)： 溫度/濕度傳感器
英文描述： Digital temperature sensor and thermal watchdog
中文描述： 數(shù)字溫度傳感器和熱看門(mén)狗
文件頁(yè)數(shù)： 10/37頁(yè)
文件大?。?/td> 204K
代理商： STDS75M2E
Operation
STDS75
10/37
2
Operation
After each temperature measurement and analog-to-digital conversion, the STDS75 stores
the temperature as a 16-bit two’s complement number in the 2-byte temperature register
(see
Table 8: Temperature register format
). The most significant Bit (S, Bit 15) indicates if
the temperature is positive or negative:
for positive numbers S = 0, and
for negative numbers S = 1.
●
●
The most recently converted digital measurement can be read from the temperature register
at any time. Since temperature conversions are performed in the background, reading the
temperature register does not affect the operation in progress.
Bits 3 through 0 of the temperature register are hardwired to logic '0.' When the STDS75 is
configured for 12-bit resolution, the 12MSBs (Bits 15 through 4) of the temperature register
will contain temperature data. For 11-bit resolution, the 11MSBs (Bits 15 through 5) of the
temperature register will contain data, and Bit 4 will read out as logic '0.' For 10-bit
resolution, the 10MSbs (Bits 15 through 6) will contain data, and for 9-bit resolution the
9MSbs (Bits 15 through 7) will contain data and all unused LSBs will contain '0s.'
Table 3 on page 15
gives examples of 12-bit resolution digital output data and the
corresponding temperatures. The data is compared to the values in the T
OS
and T
HYS
registers, and then the OS/INT is updated based on the result of the comparison and the
operating mode. The number of T
OS
and T
HYS
bits used during the thermostat comparison
is equal to the conversion resolution set by the FT1 and FT0 Bits in the Configuration
register. For example, if the resolution is 9 bits, only the 9MSbs of T
OS
and T
HYS
will be used
by the thermostat comparator. The alarm fault tolerance is controlled by the FTI and FTO
Bits in the Configuration register. They are used to set up a fault queue. This prevents false
tripping of the OS/INT pin when the STDS75 is used in a noisy environment (see
Table 2 on
page 14
).
The active state of the OS/INT output can be changed via the Polarity (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 STDS75, the OS/INT
output should be left floating.
Note:
If the thermostat is not used, the T
OS
and T
HYS
registers can be used for general storage of
system data.
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