MPXM2102AS datasheet(476/670 Pages) MOTOROLA

476 / 670 page

AN1536

3–330

Motorola Sensor Device Data

www.motorola.com/semiconductors

The calibration of this system is as follows. Refer to Table 1.

CAUTION: While installing or changing the proper jumpers

described by each step, power must be off. Reapply power to

read the display after jumpers have been installed in their

proper location for each step. In each step there is a few

seconds’ delay after switching the power on and before an

output is displayed. Steps 1 through 3 must be performed prior

to system being operational.

Calibration

1. The pressure range of the system must be established.

The present software installed in this design supports 15,

30 and 100 psi sensors. Using an MPXM2202GS sensor

(30 psi) for example, only jumper J2 should be installed.

After power is applied, the LCD should read “30.” Power

off the system prior to proceeding to step 2.

2. The total system offset, due to the sensor and A/D, must

be established for the software routine to effectively

calibrate. With power off, jumpers J1 and J3 should be

installed. Reapply power, and the LCD should respond

with “000.” The offset value measured in this step is thus

stored for use in circuit operation. Power off the system

prior to proceeding to step 3.

3. In this step, the system full scale span is calibrated. With

power off, install jumper J1 only. Now apply the full rated

pressure (30 psi for MPXM2202GS) to the sensor, power

on and ensure the display reads “FFF.” The full scale

span measured in this step is thus stored for use in circuit

operation. Power off the system prior to step 4.

Operation

4. Ensure power is off, and install jumpers J1, J2 and J3.

The system is now ready for operation. Simply apply

power and pressure to the sensor, and the LCD will

display the proportional speed above 5 mph, up to the

limits of the sensor.

REFERENCES

Burry, Michael (1989). “Calibration–Free Pressure Sensor

System,” Motorola Application Note AN1097.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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