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參數(shù)資料
| 型號： | ADT7408CCPZ2-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 4Cel, SQUARE, SURFACE MOUNT |
| 封裝： | 3 X 3 MM, MO-229VEED-4, LFCSP-8 |
| 文件頁數(shù)： | 4/22頁 |
| 文件大小： | 570K |
| 代理商： | ADT7408CCPZ2-REEL7 |
ADT7408
Preliminary Technical Data
Rev. PrC | Page 12 of 22
Temperature Trip Point Registers
There are three Temperature Trip Point Registers, they are the Alarm Temperature Upper Boundary Register, the Alarm Temperature
Lower Boundary Register, and the Critical Temperature Register
Alarm Temperature Upper Boundary Register (read/write)
The value is the upper threshold temperature value for Alarm Mode. The data format is Two’s complement with one LSB = 0.25oC. RFU
(Reserved For Future Use) bits are not supported and will always report zero. Interrupts will respond to the presently programmed
boundary values. If boundary values are being altered in-system, it is advised to turn off interrupts until a known state can be obtained to
avoid superfluous interrupt activity. The format of this Register in shown in Table 13.
Table 13 Alarm Temperature Upper Boundary Register
Bits
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Sign
MSB
LSB
Content
0
Alarm Window Upper Boundary Temperature
RFU
Alarm Temperature Lower Boundary Register (read/write)
The value is the lower threshold temperature value for Alarm Mode. The data format is Two’’s complement with one LSB = 0.25oC. RFU
bits are not supported and will always report zero. Interrupts will respond to the presently programmed boundary values. If boundary
values are being altered in-system, it is advised to turn off interrupts until a known state can be obtained to avoid superfluous interrupt
activity. The format of this Register in shown in Table 14.
Table 14 Alarm Temperature Lower Boundary Register
Bits
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Sign
MSB
LSB
Content
0
Alarm Window Upper Boundary Temperature
RFU
Critical Temperature Register (read/write)
The value is the critical temperature. The data format is Two’s complement with one LSB = 0.25oC. RFU bits are not supported and will
always report zero. The format of this Register in shown in Table 15.
Table 15 Critical Temperature Register
Bits
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Sign
MSB
LSB
Content
0
Critical Temperature Trip Point
RFU
Temperature Value Register (read only)
This 16-bit read only register stores the Trip Status and the temperature measured by the internal temperature sensor as shown in Table
16. The temperature is stored in 13-bit Two’s complement format with the MSB being the temperature sign bit and the 12 LSBs represent
temperature. One LSB = 0.0625oC. The most significant bit will have a resolution of 128oC.
When reading from this register the eight MSBs (Bit D15 to Bit D8) are read first and then the eight LSBs (Bit D7 to Bit D0) are read.
The Trip Status bits represent the internal temperature trip detection, and are not affected by the status of the Event or Configuration bits
e.g. Event Output Control, Clear Event. If neither Above or Below are set (i.e. both are 0) then the current Temperature is exactly within
the alarm window boundaries as defined in the Configuration Register. The format and descriptions are shown in Tables 16 and 17
respectively.
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