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參數(shù)資料
| 型號： | ADT7317ARQ |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:37; Series:LJT07R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Pin; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:15-35 |
| 中文描述： | SPI/I2C兼容，10位數(shù)字溫度傳感器和四DAC的電壓輸出12/10/8-Bit |
| 文件頁數(shù)： | 16/32頁 |
| 文件大?。?/td> | 340K |
| 代理商： | ADT7317ARQ |
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16
–
REV. PrN
PRELIMINARY TECHNICAL DATA
ADT7316/7317/7318
MEASUREMENT METHOD
INTERNAL TEMPERATURE MEASUREMENT
The ADT7316/7317/7318 contains an on-chip bandgap
temperature sensor, whose output is digitized by the on-
chip ADC. The temperature data is stored in the Internal
Temperature Value Register. As both positive and nega-
tive temperatures can be measured, the temperature data is
stored in two's complement format, as shown in Table 3
.
The thermal characteristics of the measurement sensor
could change and therefore an offset is added to the mea-
sured value to enable the transfer function to match the
thermal characteristics. This offset is added before the
temperature data is stored. The offset value used is stored
in the Internal Temperature Offset Register.
EXTERNAL TEMPERATURE MEASUREMENT
The ADT7316/7317/7318 can measure the temperature of
one external diode sensor or diode-connected transistor.
The forward voltage of a diode or diode-connected tran-
sistor, operated at a constant current, exhibits a negative
temperature coefficient of about -2mV/
o
C. Unfortunately,
the absolute value of V
be
, varies from device to device, and
individual calibration is required to null this out, so the
technique is unsuitable for mass-production.
The time taken to measure the external temperature can
be reduced by setting C0 of Control Config. 3 register
(1Ah). This increases the ADC clock speed from 1.4KHz
to 22KHz but the analog filters on the D+ and D- input
pins are switched off to accommodate the higher clock
speeds. Running at the slower ADC speed, the time taken
to measure the external temperature is TBD while on the
fast ADC this time is reduced to TBD.
The technique used in the ADT7316/7317/7318 is to
measure the change in V
be
when the device is operated at
two different currents.
This is given by:
V
be
= KT/q x 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 10 shows the input signal conditioning used to
measure the output of an external temperature sensor.
This figure shows the external sensor as a substrate tran-
sistor, provided for temperature monitoring on some mi-
croprocessors, but it could equally well be a discrete
transistor.
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.
We recommend that a 2N3906 be used as the external
transistor.
To prevent ground noise interfering with the measure-
ment, the more negative terminal of the sensor is not ref-
erenced to ground, but is biased above ground by an
internal diode at the D- input. As the sensor is operating
in a noisy environment, C1 is provided as a noise filter.
See the section on layout considerations for more informa-
tion on C1.
To measure
V
be
, the sensor is switched between operating
currents of I and N x I. The resulting waveform is passed
through a lowpass filter to remove noise, thence to a chop-
per-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 mea-
sured by the ADC to give a temperature output in 8-bit
two
’
s complement format. To further reduce the effects of
noise, digital filtering is performed by averaging the re-
sults of 16 measurement cycles.
Figure 10. Signal Conditioning for External Diode temperature Sensors
V
DD
I
N x I
I
BIAS
D+
D-
REMOTE
SENSING
TRANSISTOR
(2N3906)
LOWPASS FILTER
f
c
= 65kHz
TO ADC
V
OUT+
V
OUT-
BIAS
DIODE
C1
OPTIONAL CAPACITOR, UP TO
3nF MAX. CAN BE ADDED TO
IMPROVE HIGH FREQUENCY
NOISE REJECTION IN NOISY
ENVIRONMENTS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADT7318 | Circular Connector; No. of Contacts:37; Series:LJT07R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Pin; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:15-35 |
| ADT7318ARQ | Circular Connector; No. of Contacts:37; Series:LJT07R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Pin; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:15-35 |
| ADT7411 | SPI/I2C compatible，10-bit digital temperature sensor and 8-channel ADC |
| ADT7411ARQ | SPI/I2C Compatible, 10-Bit Digital Temperature Sensor and 8-Channel ADC |
| ADT7411ARQ-REEL | Circular Connector; No. of Contacts:26; Series:LJT07R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Pin; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:17-26 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADT7317ARQ-REEL | 制造商:Analog Devices 功能描述:Digital Temperature Sensor 16-Pin QSOP T/R 制造商:Rochester Electronics LLC 功能描述:DTS, 10-BIT QUAD VOLTAGE OUTPUT DAC I.C. - Tape and Reel |
| ADT7317ARQ-REEL7 | 制造商:Analog Devices 功能描述:Digital Temperature Sensor 16-Pin QSOP T/R 制造商:Rochester Electronics LLC 功能描述:DTS, 10-BIT QUAD VOLTAGE OUTPUT DAC I.C. - Tape and Reel |
| ADT7317ARQZ | 功能描述:IC SENSOR TEMP QUAD DAC 16QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:SilentSense™ 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:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠(yuǎn)程（最大） 拓?fù)?ADC（三角積分型），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報(bào):是 輸出風(fēng)扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| ADT7317ARQZ-REEL | 功能描述:IC SENSOR TEMP QUAD DAC 16QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:SilentSense™ 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:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠(yuǎn)程（最大） 拓?fù)?ADC（三角積分型），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報(bào):是 輸出風(fēng)扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| ADT7317ARQZ-REEL7 | 功能描述:IC SENSOR TEMP QUAD DAC 16QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:SilentSense™ 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:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠(yuǎn)程（最大） 拓?fù)?ADC（三角積分型），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報(bào):是 輸出風(fēng)扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
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