MPXM2102AS datasheet(438/670 Pages) MOTOROLA

438 / 670 page

AN1326

3–292

Motorola Sensor Device Data

www.motorola.com/semiconductors

LCD Interface

In order to digitally display the barometric pressure

conversion, a serial LCD interface was developed to

communicate with the MCU. This system includes an

MC145453 CMOS serial interface/LCD driver, and a 4–digit,

non–multiplexed LCD. In order for the MCU to communicate

correctly with the interface, it must serially transmit six bytes

for each conversion. This includes a start byte, a byte for each

of the four decimal display digits, and a stop byte. For

formatting purposes, decimal points and blank digits can be

displayed through appropriate bit patterns. The control of

display digits and data transmission is executed in the source

code through subroutines BCDCONV, LOOKUP, SP12LCD,

and TRANSFER. A block diagram of this interface is included

below.

CONCLUSION

This digital barometer system described herein is an

excellent example of a sensing system using solid state

components and software to accurately measure barometric

pressure. This system serves as a foundation from which

more complex systems can be developed. The MPXM2102A

series

pressure

sensors

provide

the

calibration

and

temperature compensation necessary to achieve the desired

accuracy and interface simplicity for barometric pressure

sensing applications.

MC68HC11

MOSI

SCK

DIGIT1

DIGIT2

DIGIT3

DIGIT4

VDD

BP IN

BP OUT

OSC IN

OUT 33

DATA

CLOCK

VSS

OUT1

MC145453

+5 V

Figure 4. LCD Display Interface Diagram

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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