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STTS2004 데이터시트(PDF) 28 Page - STMicroelectronics

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STTS2004 데이터시트(HTML) 28 Page - STMicroelectronics

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Temperature sensor registers
STTS2004
28/58
DocID024229 Rev 3
4.4.1
Alarm window trip
The device provides a comparison window with an upper temperature trip point in the alarm
upper boundary register, and a lower trip point in the alarm lower boundary register. When
enabled, the event output will be triggered whenever entering or exiting (crossing above or
below) the alarm window.
4.4.2
Critical trip
The device can be programmed in such a way that the event output is only triggered when
the temperature exceeds the critical trip point. The critical temperature setting is
programmed in the critical temperature register. When the temperature sensor reaches the
critical temperature value in this register, the device is automatically placed in comparator
mode, which means that the critical event output cannot be cleared by using software to set
the clear event bit.
Table 16. Temperature trip point register format
P3
P2
P1
P0
Name
Register description
Width
(bits)
Type
(R/W)
Default state
(POR)
0
0
1
0
UPPER
Alarm temperature upper boundary
16
R/W
00 00
0
0
1
1
LOWER
Alarm temperature lower boundary
16
R/W
00 00
0
1
0
0
CRITICAL
Critical temperature
16
R/W
00 00
Table 17. Alarm temperature upper boundary register format
Sign
MSB
LSB(1)
Bit
15
Bit
14
Bit
13
Bit
12
Bit
11
Bit
10
Bit
9
Bit
8
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit(2)
1
Bit(3)
0
000
Alarm window upper boundary temperature
00
1. Bit 2 is LSB for default 10-bit mode.
2. Depending on status of the resolution register, bit 1 may display 0.125 °C value.
3. Depending on status of the resolution register, bit 0 may display 0.0625 °C value.
Table 18. Alarm temperature lower boundary register format
Sign
MSB
LSB(1)
Bit
15
Bit
14
Bit
13
Bit
12
Bit
11
Bit
10
Bit
9
Bit
8
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit(2)
1
Bit(3)
0
000
Alarm window lower boundary temperature
00
1. Bit 2 is LSB for default 10-bit mode.
2. Depending on status of the resolution register, bit 1 may display 0.125 °C value.
3. Depending on status of the resolution register, bit 0 may display 0.0625 °C value.



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