MCP3425 datasheet(22/30 Pages) MICROCHIP

22 / 30 page

MCP3425

DS22072A-page 22

Figure 6-6, shows an example of interfacing with a

bridge sensor for pressure measurement.

FIGURE 6-6:

Example of Pressure

Measurement.

In this circuit example, the sensor full scale range is

±7.5 mV with a common mode input voltage of V

DD / 2.

This configuration will provide a full 14-bit resolution

across the sensor output range. The alternative circuit

for this amount of accuracy would involve an analog

gain stage prior to a 16-bit ADC.

Figure 6-7

shows

example

temperature

measurement using a thermistor. This example can

achieve a linear response over a 50

°C temperature

range. This can be implemented using a standard

resistor with 1% tolerance in series with the thermistor.

The value of the resistor is selected to be equal to the

thermistor value at the mid-point of the desired

temperature range.

FIGURE 6-7:

Example of Temperature

Measurement.

NPP301

MCP3425

VIN+

VIN-

VDD

VSS

SCL

SDL

10 µF

0.1 µF

Rpull-up

VDD

TO MCU

(MASTER)

VDD

10 k

Resistor

10 k

Thermistor

MCP3425

VIN+

VIN-

VDD

VSS

SCL

SDL

10 µF

0.1 µF

Rpull-up

VDD

TO MCU

(MASTER)

VDD

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