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| 型號： | ADT7485AARMZ-R |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 353K |
| 描述： | IC TEMP/VOLT DGL SENS SST 10MSOP |
| 產(chǎn)品變化通告： | MFG CHG Notification ADI to ON Semi |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 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： | ±1.75°C（最小值） |
| 拓?fù)洌?/td> | ADC，多路復(fù)用器，寄存器庫 |
| 輸出類型： | Simple Serial Transport?（SST） |
| 輸出警報(bào)： | 無 |
| 輸出風(fēng)扇： | 無 |
| 電源電壓： | 3 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
ADT7485A
http://onsemi.com
10
biased above ground by an internal diode at the D1 input.
If the sensor is operating in an extremely noisy environment,
C1 can be added as a noise filter. Its value should not exceed
1,000 pF.
Figure 15. Signal Conditioning for Remote Diode Temperature Sensors
LOW-PASS FILTER
f
C
= 65 kHz
REMOTE
SENSING
TRANSISTOR
BIAS
DIODE
D1+
D1
V
CC
I
BIAS
I
N2 ?I
V
OUT+
V
OUT
To ADC
C1*
*CAPACITOR C1 IS OPTIONAL. IT SHOULD ONLY BE USED IN NOISY ENVIRONMENTS.
N1 ?I
To measure DV
BE
, the operating current through the
sensor is switched between three related currents. Figure 15
shows N1 ?I and N2 ?I as different multiples of the
current I. The currents through the temperature diode are
switched between I and N1 ?I, giving DV
BE1
, and then
between I and N2 ?I, giving DV
BE2
. The temperature can
then be calculated using the two DV
BE
measurements. This
method can also cancel the effect of series resistance on the
temperature measurement. The resulting DV
BE
waveforms
are passed through a 65 kHz low-pass filter to remove noise
and then through a chopper-stabilized amplifier to amplify
and rectify the waveform, producing a dc voltage
proportional to DV
BE
. The ADC digitizes this voltage, and
a temperature measurement is produced. To reduce the
effects of noise, digital filtering is performed by averaging
the results of 16 measurement cycles for low conversion
rates. Signal conditioning and measurement of the internal
temperature sensor is performed in the same manner.
Reading Temperature Measurements
The temperature data returned is two bytes in little endian
format, that is, LSB before MSB. All temperatures can be
read together by using Command Code 0x00 with a read
length of 0x04. The command codes and returned data are
described in Table 14.
Table 14. TEMPERATURE CHANNEL COMMAND
CODES
Temp
Channel
Command
Code
Returned Data
Internal
0x00
LSB, MSB
External
0x01
LSB, MSB
All Temps
0x00
Internal LSB, Internal MSB;
External LSB, External MSB
SST Temperature Sensor Data Format
The data for temperature is structured to allow values in
the range of ?12癈 to be reported. Thus, the temperature
sensor format uses a twos complement, 16-bit binary value
to represent values in this range. This format allows
temperatures to be represented with approximately a
0.016癈 resolution.
Table 15. SST TEMPERATURE DATA FORMAT
Temperature (5C)
Twos Complement
MSB
LSB
125
1110 0000
1100 0000
80
1110 1100
0000 0000
40
1111 0110
0000 0000
20
1111 1011
0011 1110
5
1111 1110
1100 0000
1
1111 1111
1100 0000
0
0000 0000
0000 0000
+1
0000 0000
0100 0000
+5
0000 0001
0100 0000
+20
0000 0100
1100 0010
+40
0000 1010
0000 0000
+80
0001 0100
0000 0000
+125
0001 1111
0100 0000
Using Discrete Transistors
If a discrete transistor is used, the collector is not 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 is
connected to the D+ input. If an NPN transistor is used, the
emitter is connected to the D input and the base is
connected to the D+ input.
Figure 16 shows how to connect the ADT7485A to an NPN
or PNP transistor for temperature measurement. To prevent
ground noise from interfering 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
D1 input.
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| ADT7485AARMZ-R7 | 功能描述:板上安裝溫度傳感器 TMP SNSR/VLTG MON W/SST INTERFACE 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 |
| ADT7485AARMZ-REEL | 功能描述:IC TEMP/VOLT DIG SENSOR 10-MSOP 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 |
| ADT7485AARMZ-REEL7 | 功能描述:IC TEMP/VOLT DGL SENS SST 10MSOP 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 |
| ADT7486A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Digital Temperature Sensor with SST Interface |
| ADT7486AARMZ-R7 | 功能描述:板上安裝溫度傳感器 DGL TMP SNSR SST INF 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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