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參數(shù)資料
| 型號： | ADT7460ARQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | dB COOL?? Remote Thermal Controller and Fan Controller |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | 0.025 INCH PITCH, MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 15/48頁 |
| 文件大?。?/td> | 695K |
| 代理商： | ADT7460ARQ |
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REV. 0
ADT7460
–15–
If a discrete transistor is used, the collector will not be grounded,
and should be 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. Figure 15 shows
how to connect the ADT7460 to an NPN or PNP transistor for
temperature measurement. To prevent ground noise from inter-
fering with the measurement, the more negative terminal of the
sensor is not referenced to ground but is biased above ground
by an internal diode at the D– input.
To measure
V
BE
, the sensor is switched between operating cur-
rents of I and N I. The resulting waveform is passed through
a 65 kHz low-pass filter to remove noise, and to a chopper-
stabilized amplifier that performs the functions of amplification
and rectification of the waveform to produce a dc voltage
proportional to
V
BE
. This voltage is measured by the ADC to
give a temperature output in 10-bit, twos complement format. To
further reduce the effects of noise, digital filtering is performed
by averaging the results of 16 measurement cycles. A remote
temperature measurement takes nominally 25.5 ms. The results
of remote temperature measurements are stored in 10-bit, twos
complement format, as illustrated in Table III. The extra resolu-
tion for the temperature measurements is held in the Extended
Resolution Register 2 (Reg. 0x77). This gives temperature read-
ings with a resolution of 0.25 C.
Table III. Temperature Data Format
Temperature
Digital Output (10-Bit)
*
–128 C
–125 C
–100 C
–75 C
–50 C
–25 C
–10 C
0 C
+10.25 C
+25.5 C
+50.75 C
+75 C
+100 C
+125 C
+127 C
1000 0000
00
1000 0011
00
1001 1100
00
1011 0101
00
1100 1110
00
1110 0111
00
1111 0110
00
0000 0000
00
0000 1010
01
0001 1001
10
0011 0010
11
0100 1011
00
0110 0100
00
0111 1101
00
0111 1111
00
*
Bold denotes 2 LSBs of measurement in Extended
Resolution Register 2 (Reg. 0x77) with 0.25 C resolution.
ADT7460
2N3904
NPN
D+
D–
Figure 15a. Measuring Temperature Using an
NPN Transistor
2N3906
PNP
ADT7460
D+
D–
Figure 15b. Measuring Temperature Using a
PNP Transistor
Nulling Out Temperature Errors
As CPUs run faster, it is getting more difficult to avoid high fre-
quency clocks when routing the D+, D– traces around a system
board. Even when recommended layout guidelines are followed,
there may still be temperature errors attributed to noise being
coupled onto the D+/D– lines. High frequency noise generally
has the effect of giving temperature measurements that are too
high by a constant amount. The ADT7460 has temperature
offset registers at addresses 0x70, 0x72 for the Remote 1 and
Remote 2 temperature channels. By doing a one-time calibration
of the system, one can determine the offset caused by system
board noise and null it out using the offset registers. The offset
registers automatically add a twos complement 8-bit reading to
every temperature measurement. The LSB adds 0.25
°
C offset
to the temperature reading so the 8-bit register effectively allows
temperature offsets of up to 32 C with a resolution of 0.25 C.
This ensures that the readings in the temperature measurement
registers are as accurate as possible.
Temperature Offset Registers
Reg. 0x70 Remote 1 Temp Offset = 0x00 (0
°
C default)
Reg. 0x71 Local Temp Offset = 0x00 (0
°
C default)
Reg. 0x72 Remote 2 Temp Offset = 0x00 (0
°
C default)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADT7460ARQ-REEL | 功能描述:IC SENSOR TEMP FAN-CTRL 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 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: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 |
| ADT7460ARQ-REEL7 | 功能描述:IC SENSOR TEMP FAN-CTRL 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 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: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 |
| ADT7460ARQZ | 功能描述:馬達(dá)/運(yùn)動/點(diǎn)火控制器和驅(qū)動器 THERMAL MGMT CNTRLR 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 |
| ADT7460ARQZ-R7 | 制造商:ON Semiconductor 功能描述:Temp Sensor Digital Serial (3-Wire) 16-Pin QSOP T/R |
| ADT7460ARQZ-REEL | 功能描述:板上安裝溫度傳感器 THERMAL MGMT CNTRLR IC RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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