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參數(shù)資料
| 型號(hào)： | NCT1008DMT3R2G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | %2B-1℃ temperature monitor with series resistance cancellation |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, DSO8 |
| 封裝： | 2 X 2 MM, 0.50 MM PITCH, LEAD FREE, DFN-8 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大?。?/td> | 251K |
| 代理商： | NCT1008DMT3R2G |
NCT1008
http://onsemi.com
8
Figure 14. Input Signal Conditioning
VDD
IBIAS
N2 y I
I
BIAS
DIODE
D+
D–
C11
1CAPACITOR C1 IS OPTIONAL. IT IS ONLY NECESSARY IN NOISY ENVIRONMENTS.
REMOTE
SENSING
TRANSISTOR
fC = 65kHz
VOUT+
VOUT–
TO ADC
N1 y I
C1 = 1000pF MAX.
Temperature Measurement Results
The results of the local and remote temperature
measurements are stored in the local and remote temperature
value registers and compared with limits programmed into
the local and remote high and low limit registers.
The local temperature value is in Register 0x00 and has a
resolution of 1
°C. The external temperature value is stored
in two registers, with the upper byte in Register 0x01 and the
lower byte in Register 0x10. Only the two MSBs in the
external temperature low byte are used giving the external
temperature measurement a resolution of 0.25
°C. Table 1
lists the data format for the external temperature low byte.
Table 1. 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
When reading the full external temperature value, read the
LSB first. This causes the MSB to be locked (that is, the
ADC does not write to it) until it is read. This feature ensures
that the results read back from the two registers come from
the same measurement.
Temperature Measurement Range
The temperature measurement range for both internal and
external measurements is, by default, 0
°C to +127°C.
However, the NCT1008 can be operated using an extended
temperature range. The extended measurement range is
64
°C to +191°C. Therefore, the NCT1008 can be used to
measure the full temperature range of an external diode,
from 55
°C to +150°C.
The extended temperature range is selected by setting Bit
2 of the configuration register to 1. The temperature range
is 0
°C to 127°C when Bit 2 equals 0. A valid result is
available in the next measurement cycle after changing the
temperature range.
In extended temperature mode, the upper and lower
temperature that can be measured by the NCT1008 is limited
by the remote diode selection. The temperature registers can
have values from 64
°C to +191°C. However, most
temperature sensing diodes have a maximum temperature
range of 55
°C to +150°C. Above +150°C, they may lose
their semiconductor characteristics and approximate
conductors instead. This results in a diode short. In this case,
a read of the temperature result register gives the last good
temperature measurement. Therefore, the temperature
measurement on the external channel may not be accurate
for temperatures that are outside the operating range of the
remote sensor.
It should be noted that although both local and remote
temperature measurements can be made while the part is in
extended temperature mode, the NCT1008 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 NCT1008 has two temperature data formats. When the
temperature measurement range is from 0
°C to 127°C
(default), the temperature data format for both internal and
external 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 are
offset by 64
°C in the offset binary data format. Examples of
temperatures in both data formats are shown in Table 2.
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