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| 型号： | TMPSNSRD-TCPL1 |
| 厂商： | Microchip Technology |
| 文件页数： | 8/30页 |
| 文件大小： | 0K |
| 描述： | BOARD RTD REFERENCE DESIGN |
| 产品培训模块： | MCP3901 Analog Front End |
| 标准包装： | 1 |
| 传感器类型： | 温度，热电偶 |
| 嵌入式： | 否 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MCP3421，MCP9804 |
| 产品目录页面： | 672 (CN2011-ZH PDF) |
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Oscillator Circuits For Sensors
RC Operational Amplifier Oscillators
For Sensor Applications
Op Amp or state-variable oscillators can be used to
accurately measure resistive and capacitive sensors.
Oscillators do not require an analog-to-digital converter and
provide a sensor measurement whose conversion to digital
has an accuracy limited only by the reference clock signal.
State-variable oscillators are often used in sensor
conditioning applications because they have a reliable
start-up and a low sensitivity to stray capacitance.
Absolute quartz pressure sensors and humidity sensors
are examples of capacitive sensors that can use the
state-variable oscillator. Also, this circuit can be used with
resistive sensors, such as RTDs, to provide temperature-to-
frequency conversion.
The block diagram below shows a typical system
level design, including the state-variable oscillator,
PIC microcontroller and temperature sensor (used for
temperature correction).
Sensors and Applications
Resistive Sensors
■ ? RTDs
■ ? Humidity
■ ? Thermistors
Capacitive Sensors
■ ? Humidity
■ ? Pressure
■ ? Oil Level
Related Application Notes:
AN895: Oscillator Circuits for RTD Temperature Sensors
AN866: Designing Operational Amplifier Oscillator Circuits
for Sensor Applications
Available on the Microchip web site at: www.microchip.com
Oscillator Circuits for Sensors
C 1
C 2
C 4
R 1 = RTD A
R 2 = RTD B
R 4
R 8
V DD /2
MCP6294
1/4 MCP6234
MCP6004
V DD /2
MCP6294
2/4 MCP6234
MCP6004
R 3
V DD /2
3/4 MCP6294
MCP6234
MCP6004
R 7
V DD /2
+
–
MCP6541
MCP6561
V OUT
V DD
Attributes:
R 5
V DD
? Precision dual Element RTD
Sensor Circuit
R 6
C 5
+
–
V DD /2
? Reliable Oscillation Startup
? Freq. ∝ (R 1 x R 2 ) 1/2
4/4 MCP6294
MCP6234
MCP6004
Oscillator Circuits for Sensors
R 1 = RTD
C 1
V DD
Attributes:
?
Low Cost Solution
R 2
A 1
MCP6541
MCP6561
V OUT
?
?
?
Single Comparator Circuit
Square Wave Output
Freq. = 1/ (1.386 x R 1 x C 1 )
V DD
R 3
R 4
8
Signal Chain Design Guide
相关PDF资料 |
PDF描述 |
|---|---|
| TMPSNSRD-RTD2 | BOARD RTD REFERENCE DESIGN |
| IR2183PBF | IC DRIVER HALF BRIDGE 8DIP |
| IR21814SPBF | IC DRIVER HIGH/LOW SIDE 14SOIC |
| IR1167BSTRPBF | IC SMART SECONDARY DRIVER 8-SOIC |
| IR21814PBF | IC DRIVER HIGH/LOW SIDE 14DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TMPSNS-RTD1 | 功能描述:开发板和工具包 - PIC / DSPIC RTD Temp Sensor Demo Brd RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| TMPT2369ALT | 制造商:ALL 功能描述:ALLEGRO NXC7D |
| TMPT2SU1 | 制造商:Red Lion Controls 功能描述:THERMOCOUPLE TEMP PROBE, TYPE T, 400?F 制造商:Red Lion Controls 功能描述:TYPE T 400DEG F |
| TMPT3906LT | 制造商:ALL 功能描述:ALLEGRO S9K3A |
| TMPT5089LT | 制造商:Allegro MicroSystems LLC 功能描述:Bipolar Junction Transistor, NPN Type, TO-236 |
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