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Thermal/Linear Intelligent Sensor PICtail? Plus Daughter Board
2.1.9
Jumper to Include or Bypass Level Shifter (JP2)
The jumper JP2 determines whether the level shifter circuit will be included in the linear
signal chain or bypassed completely. To include the level shifter, install the jumper in
the 1-2 position (indicated by the arrow marked adjacent to the jumper on the Daughter
Board). To bypass the level shifter and supply the linear input signal directly to the
anti-aliasing low-pass filter, install the jumper in the 2-3 position.
2.1.10
Level Shifter for Linear Signal (U7)
The level shifter circuit is implemented using the MCP602 dual op amp IC. Op amp A
works in conjunction with the external components to provide the required level shift,
and op amp B serves as a buffer.
2.1.11
Potentiometer for Level Shifter Adjustment (R30)
Users can manually adjust the level provided by the level shifter by rotating the screw
on the potentiometer R30. The level of the signal mid-point can range from 0V to 3.3V,
depending on the potentiometer adjustment. Rotating the potentiometer screw
clockwise increases the signal level, whereas rotating it in a counterclockwise direction
decreases the signal level.
2.1.12
Thermocouple Connector (J1)
The Daughter Board contains a standard K-type thermocouple connector labeled J1.
A thermocouple with the appropriate receptacle can be inserted directly into the
connector.
2.1.13
Linear Signal Connector (J3)
Connector J3 contains a pair of test points, which allow users to supply an external
linear signal, either from a real sensor or generated artificially for development
purposes.
DS70574A-page 14
? 2008 Microchip Technology Inc.
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