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參數(shù)資料
| 型號： | ADM1031ARQ |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 5/35頁 |
| 文件大?。?/td> | 368K |
| 代理商： | ADM1031ARQ |
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ADM1031
Rev. 3 | Page 13 of 35 | www.onsemi.com
TEMPERATURE MEASUREMENT SYSTEM
INTERNAL MEASUREMENT
The ADM1031 contains an on-chip bandgap temperature sensor.
The on-chip ADC performs conversions on the output of this
sensor and outputs the temperature data in 10-bit twos com-
plement format. The resolution of the local temperature sensor is
0.25°C. The format of the temperature data is shown in Table 6.
EXTERNAL MEASUREMENT
The ADM1031 can measure the temperatures of two external
diode sensors or diode-connected transistors, connected to
Pins 9 and 10, and Pins 11 and 12.
These pins are dedicated temperature input channels. The
function of Pin 7 is as a THERM input/output and is used to
flag overtemperature conditions.
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. As a result, the technique
is unsuitable for mass production.
The technique used in the ADM1031 is to measure the change
in VBE when the device is operated at two different currents.
This is given by
ΔVBE = KT/q × ln (N)
where:
K is Boltzmann’s constant.
q is charge on the carrier.
T is absolute temperature in Kelvins.
N is ratio of the two currents.
Figure 19 shows the input signal conditioning used to measure
the output of an external temperature sensor. This figure shows
the external sensor as a substrate transistor, provided for
temperature monitoring on some microprocessors, but it could
equally well be a discrete transistor.
REMOTE
SENSING
TRANSISTOR
BIAS
DIODE
D+
D–
TO
ADC
LOW-PASS
FILTER
fC = 65kHz
VDD
VOUT+
VOUT–
IBIAS
IN × I
02402-
019
Figure 19. Signal Conditioning
If a discrete transistor is used, then the collector is not
grounded, and is linked to the base. If a PNP transistor is used,
the base is connected to the D– input and the emitter to the D+
input. If an NPN transistor is used, the emitter is connected to
the D– input and the base to the D+ input.
One LSB of the ADC corresponds to 0.125°C, so the ADM1031
can theoretically measure temperatures from –127°C to
+127.75°C, although –127°C is outside the operating range for
the device. The extended temperature resolution data format is
shown in Table 7 and
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| ADM1031ARQ-ND | 制造商:ON Semiconductor 功能描述: |
| ADM1031ARQ-REEL | 功能描述:IC SENSOR 2-TEMP/FAN CTRL 16QSOP 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 輸出類型:2 線 SMBus? 輸出警報(bào):無 輸出風(fēng)扇:無 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 |
| ADM1031ARQ-REEL7 | 功能描述:IC SENSOR 2-TEMP/FAN CTRL 16QSOP 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 輸出類型:2 線 SMBus? 輸出警報(bào):無 輸出風(fēng)扇:無 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 |
| ADM1031ARQZ | 功能描述:馬達(dá)/運(yùn)動/點(diǎn)火控制器和驅(qū)動器 2 CH TDM PWM FAN CTRL IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| ADM1031ARQZ-R7 | 功能描述:IC SENSOR 2TEMP/FAN CTRL 16QSOP RoHS:是 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 輸出類型:2 線 SMBus? 輸出警報(bào):無 輸出風(fēng)扇:無 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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