MPXM2102AS datasheet(488/670 Pages) MOTOROLA

488 / 670 page

AN1551

3–342

Motorola Sensor Device Data

www.motorola.com/semiconductors

Table 2. Software Command Codes

Function

(Command Codes)

Command

from Host

Data from

Smart Sensor

Request Pressure

$01

$00–$FF

Dynamic Zero

$02

—

Undo Dynamic Zero

$03

—

Pressure Range

$04

TBD

Communication

The serial peripheral interface (SPI) is used to communicate

to a master/host MCU. The master MCU initiates all I/O control

and sends commands to the slave regarding data requests,

calibration, etc. The command codes are parsed at the slave

in a look–up table, at which time the corresponding request is

serviced via subroutine. Table 2 lists the Master/Slave

commands.

Request Pressure Returns the percent of full–scale pressure

applied to the sensor in the form of $00 (0) through $FF (255)

and is equivalent to:

Pressure Range (from 0 to 255),

where

x FS = Measured Pressure

(2)

Y 255)

255

(This calculation is performed by the master MCU.)

Dynamic Zero Assigns current input pressure as the offset

value, in order to use a nonzero pressure as the offset

reference.

Undo Dynamic Zero Resets offset to the original stored offset

(see Dynamic Zero).

Pressure Range Returns a value representing the sensor’s

full–scale pressure range.

Figure 3. SPI Timing Diagram

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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