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| 型号： | ADT7485AARMZ-R |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/12页 |
| 文件大小： | 353K |
| 描述： | IC TEMP/VOLT DGL SENS SST 10MSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 3,000 |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C，外部传感器 |
| 精确度： | ±1.75°C（最小值） |
| 拓扑： | ADC，多路复用器，寄存器库 |
| 输出类型： | Simple Serial Transport?（SST） |
| 输出警报： | 无 |
| 输出风扇： | 无 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (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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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7485AARMZ-R7 | 功能描述:板上安装温度传感器 TMP SNSR/VLTG MON W/SST INTERFACE RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| ADT7485AARMZ-REEL | 功能描述:IC TEMP/VOLT DIG SENSOR 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADT7485AARMZ-REEL7 | 功能描述:IC TEMP/VOLT DGL SENS SST 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADT7486A | 制造商:AD 制造商全称:Analog Devices 功能描述:Digital Temperature Sensor with SST Interface |
| ADT7486AARMZ-R7 | 功能描述:板上安装温度传感器 DGL TMP SNSR SST INF RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
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