TMPSNS-RTD1 Microchip Technology, TMPSNS-RTD1 Datasheet - Page 15

• Manufacturer Part Number: TMPSNS-RTD1
• Description: BOARD EVAL PT100 RTD TEMP SENSOR
• Manufacturer: Microchip Technology

Specifications of TMPSNS-RTD1

• Sensor Type: Temperature
• Interface: USB
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP3301, MCP6S26, PIC18F2550
• Processor To Be Evaluated: MCP6S26, MCP3301, MCP6024, MCP41010, PIC18F2550, TC1071, MCP6002
• Data Bus Width: 12 bit
• Interface Type: USB
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Voltage - Supply: -
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

© 2007 Microchip Technology Inc.
2.4.1.2
The PGA is used to amplify the small voltage across the RTD. The reference input pin
of the PGA is connected to the RTD negative terminal and Channel 0 and Channel 1
are connected to the positive terminals of each RTD. This allows only the voltage
across the sensor to be amplified. The PGA has a gain error of ±1% (max.) for gains
greater than 1 V/V. Refer to the datasheet (DS21685) for details.
The RTD negative terminal and the PGA output are connected to the differential
amplifier. The differential amplifier scales the PGA output. The difference amplifier gain
is shown in Equation 2-1.
EQUATION 2-1:
2.4.1.3
The GUI uses the USB port to communicate with the PIC18F2550.
FIGURE 2-6:
When start is clicked, the macro double checks hardware availability before starting
the acquisition.
All user options such as Sampling time, Stripchart buffer size, Digi. Pot Positions,
or PGA Chn/Gain setup can be changed during acquisition.
Where:
RTD SIGNAL CHAIN
THE GRAPHICAL USER INTERFACE
R
R
F
G
= 10 kΩ
= 10 kΩ Digital Potentiometer
DIFFERENCE AMPLIFIER GAIN
Hardware Status
G
Installation and Operation
=
1
+
⎛
⎝
------------------------ -
R
G
2 R
+
×
20
F
Ω
⎞
⎠
DS51607B-page 11