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| 型號： | ADT7486ARMZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 16BIT(s), 1Cel, SQUARE, SURFACE MOUNT |
| 封裝： | LEAD FREE, PLASTIC, MO-187-BA, MSOP-10 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 177K |
| 代理商： | ADT7486ARMZ-REEL |
Preliminary Technical Data
ADT7484/ADT7486
Rev. PrA | Page 13 of 16
TEMPERATURE OFFSET
As CPUs run faster, it is more difficult to avoid high frequency
clocks when routing the D1+ and D1 tracks around a system
board. Even when the recommended layout guidelines are
followed, there may still be temperature errors, attributed to
noise being coupled on to the D1+ and D1 lines. High
frequency noise generally has the effect of producing
temperature measurements that are consistently too high by a
specific amount. The ADT7484/ADT7486 have a temperature
offset command code of 0xe0 through which a desired offset
can be set. By doing a one-time calibration of the system, the
offset caused by system board noise can be calculated and
nulled by specifying it in the ADT7484/ADT7486. The offset is
automatically added to every temperature measurement. The
maximum offset is ±128°C with 0.25°C resolution. The offset
format is the same as the temperature data format—16-bit, twos
compliment notation, as shown in Table 13. The offset should
be programmed in little endian format, that is, LSB before MSB.
The offset value is also returned in little endian format when read.
APPLICATION SCHEMATICS
VCC
1
GND
2
D1+
3
D1–
4
SST
8
ADD0
7
RESERVED
6
ADD1
5
ADT7484
2N3904 OR CPU
THERMAL DIODE
051
98
-0
07
SST
Figure 18. ADT7484 Typical Application Schematic
VCC
1
2
3
4
VCC
GND
D1+
D1–
D2+
5
10
9
8
7
SST
ADD0
RESERVED
ADD1
D2–
6
ADT7486
CPU
THERMAL
DIODE
2N3904
NPN
SST
05
19
8-
0
8
Figure 19. ADT7486 Typical Application Schematic
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