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參數(shù)資料
| 型號： | ADT7461ARM-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | 【1∑C Temperature Monitor with Series Resistance Cancellation |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | MO-187-AA, MSOP-8 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 854K |
| 代理商： | ADT7461ARM-REEL7 |
ADT7461
0
I
N1
×
I
N2
×
I
I
BIAS
V
DD
V
OUT+
TO ADC
V
OUT–
REMOTE
SENSING
TRANSISTOR
*CAPACITOR C1 IS OPTIONAL. IT SHOULD ONLY BE USED IN NOISY ENVIRONMENTS.
D+
D–
C1*
BIAS
DIODE
LOW-PASS FILTER
C
= 65kHz
Figure 14. Input Signal Conditioning
TEMPERATURE MEASUREMENT RESULTS
The results of the local and remote temperature measurements
are stored in the local and remote temperature value registers
and are compared with limits programmed into the local and
remote high and low limit registers.
The local temperature value is in Register 0×00 and has a
resolution of 1°C. The external temperature value is stored in
two registers, with the upper byte in Register 0×01 and the
lower byte in Register 0×10. Only the two MSBs in the external
temperature low byte are used. This gives the external tempera-
ture measurement a resolution of 0.25°C. T
format for the external temperature low byte.
Table 5. Extended Temperature Resolution (Remote
Temperature Low Byte)
Extended
Resolution
Remote Temperature Low Byte
0.00°C
0 000 0000
0.25°C
0 100 0000
0.50°C
1 000 0000
0.75°C
1 100 0000
shows the data
able 5
When reading the full external temperature value, both the high
and low byte, the two registers should be read in succession.
Reading one register does not lock the other, so both should be
read before the next conversion finishes. In practice, there is
more than enough time to read both registers, as transactions
over the SMBus are significantly faster than a conversion time.
TEMPERATURE MEASUREMENT RANGE
The temperature measurement range for both internal and
external measurements is, by default, 0°C to +127°C. However,
the ADT7461 can be operated using an extended temperature
range. It can measure the full temperature range of an external
diode, from 55°C to +150°C. The user can switch between
these two temperature ranges by setting or clearing Bit 2 in
the configuration register. A valid result is available in the next
measurement cycle after changing the temperature range.
In extended temperature mode, the upper and lower tempera-
ture that can be measured by the ADT7461 is limited by the
remote diode selection. The temperature registers themselves
can have values from 64°C to +191°C. However, most tem-
perature sensing diodes have a maximum temperature range of
55°C to +150°C.
It should be noted that while both local and remote temperature
measurements can be made while the part is in extended
temperature mode, the ADT7461 itself should not be exposed to
temperatures greater than those specified in the absolute maximum
ratings section. Further, the device is only guaranteed to operate as
specified at ambient temperatures from 40°C to +120°C.
TEMPERATURE DATA FORMAT
The ADT7461 has two temperature data formats. When the
temperature measurement range is from 0°C to +127°C (de-
fault), the temperature data format for both internal and exter-
nal temperature results is binary. When the measurement range
is in extended mode, an offset binary data format is used for
both internal and external results. Temperature values in the
offset binary data format are offset by +64. Examples of tem-
peratures in both data formats are shown in
.
Table 6
Rev. 0 | Page 10 of 24
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