MPXM2102AS datasheet(347/670 Pages) MOTOROLA

347 / 670 page

AN1082

3–201

Motorola Sensor Device Data

www.motorola.com/semiconductors

Figure 1. Demo Kit with 4 – 20 mA Current Loop

VCC = +15 Volts dc

R12

R10

R11

Roff

OFFSET ADJUST

a 3

2N2222

–

a 1

a 2

gain

adj.

MPX2100DP

output

Basic Circuit of SEK–1

Additional Circuit for 4 to 20 mA current loop

(Receiver Load Resistance : RL = 150 to 400 Ohms)

RG = 47 K Pot.

R7 = 1 K

Roff = 1 M Pot.

R10 = 110 K

* R1 = R2 = 330 K R11 = 1 M

* R3 = R4 = 27 K R12 = 330 K

* R5 = R6 = 27 K C1 = C2 = 0.1

µF

* R8 = R9 = 150 a1, a2, a3 = 1/4 MC33079

* All resistor pairs must be matched at better than 0.5%

Note A: If using SEK–1 a1, a2, a3 = 1/2 MC33078

Note A: RG from 20 K to 47 K

Note A: R1 and R2 from 1M to 330 K

NOTICE: THE PRESSURE SENSOR OUTPUT IS RATIOMETRIC TO THE POWER SUPPLY

VOLTAGE. THE OUTPUT WILL CHANGE WITH THE SAME RATIO AS VOLTAGE CHANGE.

Remote

Receiver

–

The output is ratiometric to the power supply voltage. For

example, if the receiver reads 18 mA at 80 kPa and 15 V power

supply, the receiver should read 16.8 mA under the same

pressure with 14 V power supply.

For best results it is mandatory to use a regulated power

supply. If that is not possible, the circuit must be modified by

inserting a 12 V regulator to provide a constant supply to the

pressure sensor.

When using a Motorola MC78L12AC voltage regulator, the

circuit can be used with power voltage variation from 14 to

30 volts.

The following results have been achieved using an

MPX2100DP and two MC33078s. The resistors were regular

carbon resistors, but pairs were matched at

± 0.3% and

capacitors were 0.1

µF. The load was 150 ohms and the

transmission line was a two pair telephone line with the

+15 Vdc power supply connected on the remote receiver

side.

Note: Best performances in temperature can be achieved

using metal film resistors. The two potentiometers must be

chosen for high temperatures up to 125

°C.

The complete circuit with pressure sensor is available

under reference TZA120 and can be ordered as a regular

Motorola product for evaluation.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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