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| 型號(hào)： | ADM1033ARQZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Thermal Monitor and Fan Speed (RPM) Controller |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | LEAD FREE, MO-137AB, QSOP-16 |
| 文件頁(yè)數(shù)： | 16/40頁(yè) |
| 文件大小： | 1164K |
| 代理商： | ADM1033ARQZ-REEL7 |
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ADM1033
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.
Rev. 0 | Page 16 of 40
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)
64
40
32
2
1
0
1
2
10
20
50
75
100
125
150
191
Digital Output
0000 0000
0001 1000
0010 0000
0011 1110
0011 1111
0100 0000
0100 0001
0100 0010
0100 1010
0101 0100
0111 0010
1000 1011
1010 0100
1011 1101
1101 0110
1111 1111
Table 8. Local and Remote Sensor Extended Resolution
Extended Resolution (°C)
0.0000
0.03125
0.0625
0.125
0.250
0.375
0.500
0.625
0.750
0.875
Temperature Low Bits
00000
00001
00010
00100
01000
01100
10000
10100
11000
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 V
BE
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+
0
D–
ADM1033
2N3906
D+
D–
Figure 27. Measuring Temperature Using Discrete Transistors
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| ADM1034ARQ | 制造商:ON Semiconductor 功能描述:Temp Sensor Digital Serial (2-Wire) 16-Pin QSOP Tube 制造商:Rochester Electronics LLC 功能描述:DUAL FAN CONTROLLER, SRC, SMBUS I.C. - Bulk |
| ADM1034ARQ-REEL | 功能描述:IC THERM/FAN SPEED CTRLR 16-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫(kù) 輸出類型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
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