Sensors

8

Freescale Semiconductor, Inc.

MPL115A2

The actions taken by the part in response to each command are as follows:

X = don’t care

and Temperature data. The sequence of the commands for the interaction is given as an example to operate the MPL115A2.

Utilizing this gathered data, an example of the calculating the Compensated Pressure reading is given in floating point notation.

Device Address + write bit “To Write” = 0xC0

Device Address + read bit “To Read” = 0xC1

Command to Write “Convert Pressure and Temperature” = 0x12

Command to Read “Pressure ADC High byte” = 0x00

Command to Read “Pressure ADC Low byte” = 0x01

Command to Read “Temperature ADC High byte” = 0x02

Command to Read “Temperature ADC Low byte” = 0x03

Command to Read “Coefficient data byte 1 High byte” = 0x04

Read Coefficients:

[0xC0], [0x04], [0xC1], [0x3E], [0xCE], [0xB3], [0xF9], [0xC5], [0x17], [0x33], [0xC8]

Command

Action Taken

Start Conversions

Wake main circuits. Start clock. Allow supply stabilization time. Select pressure sensor input. Apply positive sensor

excitation and perform A to D conversion. Select temperature input. Perform A to D conversion. Load the Pressure and

Temperature registers with the result. Shut down main circuits and clock.

Command

Binary

Device Address + Read bit

1100 0001

0xC1

Read Pressure MSB

X000 0000

0x00

Read Pressure LSB

X000 0001

0x01

Read Temperature MSB

X000 0010

0x02

Read Temperature LSB

X000 0011

0x03

Read Coefficient data byte 1

X000 0100

0x04