参数资料
型号: ADM1033ARQ-REEL
厂商: ON SEMICONDUCTOR
元件分类: 温度/湿度传感器
英文描述: DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT
封装: MO-137AB, QSOP-16
文件页数: 8/39页
文件大小: 819K
代理商: ADM1033ARQ-REEL
ADM1033
Rev. 0 | Page 16 of 40
TEMPERATURE MEASUREMENT SYSTEM
INTERNAL TEMPERATURE MEASUREMENT
The ADM1033 contains an on-chip band gap temperature
sensor. The on-chip ADC performs conversions on the sensor’s
output and outputs the temperature data in 13-bit format. The
resolution of the local temperature sensor is 0.03125°C.
Table 7 shows the format of the temperature data MSBs. Table 8
shows the local and remote sensor extended resolution data for
the LSBs. To ensure accurate readings, the LSBs should be read
first. This locks the current LSBs and MSBs until the MSBs are
read. They then start to update again. (Reading only the MSBs
does not lock the registers.) Temperature updates to the look-up
table take place in parallel, so fan speeds can be updated even if
the MSBs are locked.
Table 7. Temperature Data Format for
Local and Remote Temperature High Bytes
Temperature (°C)
Digital Output
64
0000 0000
40
0001 1000
32
0010 0000
2
0011 1110
1
0011 1111
0
0100 0000
1
0100 0001
2
0100 0010
10
0100 1010
20
0101 0100
50
0111 0010
75
1000 1011
100
1010 0100
125
1011 1101
150
1101 0110
191
1111 1111
Table 8. Local and Remote Sensor Extended Resolution
Extended Resolution (°C)
Temperature Low Bits
0.0000
00000
0.03125
00001
0.0625
00010
0.125
00100
0.250
01000
0.375
01100
0.500
10000
0.625
10100
0.750
11000
0.875
11100
Temperature (°C) = (MSB 64°C) + (LSB × 0.03125)
Example: MSB = 0101 0100 = 84d
LSB = 11100 = 14
Temperature °C = (84 64) + (28 × 0.03125) = 20.875
REMOTE TEMPERATURE MEASUREMENT
The ADM1033 measures the temperature of one external diode
sensor or diode-connected transistor, which is connected to
Pins 9 and 10. These pins are dedicated temperature input
channels. The series resistance cancellation (SRC) feature can
automatically cancel out the effect of up to 1 k of resistance in
series with the remote thermal diode.
The forward voltage of a diode or diode-connected transistor,
operated at a constant current, exhibits a negative temperature
coefficient of about 2 mV/°C. Unfortunately, the absolute
value of VBE varies from device to device, and individual
calibration is required to null this out. Therefore, the technique
is unsuitable for mass production.
ADM1033
2N3904
D+
04
93
7-
0-
02
6
D–
ADM1033
2N3906
D+
D–
Figure 27. Measuring Temperature Using Discrete Transistors
Rev. 1 | Page 16 of 39 | www.onsemi.com
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