NXP Semiconductors

MPL115A1S

Miniature SPI digital barometer, 50 kPa to 115 kPa

Ref

Symbol

Function

Min

Max

Unit

6

tHCS

Enable lag time

125

—

ns

7

tSET

Data setup time

30

—

ns

8

tHOLD

Data hold time

30

—

ns

9

tDDLY

Data valid (after SCLK low edge)

—

32

ns

10

tWCS

Width CS High

30

—

ns

Table 9. SPI timing...continued

aaa-044103

SCS

CS

SCLK

tSCLK

tHOLD

tCLKL

tHCS

tWCS

tCLKH

tDDLY

DIN

DOUT

Figure 4. SPI timing diagram

8.6 Example of SPI reading of coefficients

These are MPL115A1S SPI commands to read coefficients, execute Pressure and Temperature conversions,

and to read Pressure and Temperature data. The sequence of the commands for the interaction is given

as an example to operate the MPL115A1S. Utilizing this gathered data, an example of the calculating the

Compensated Pressure reading is given in floating point notation.

SPI Commands (simplified for communication)

Command to Write "Convert Pressure and Temperature" = 24h

Command to Read "Pressure ADC High byte" = 80h

Command to Read "Pressure ADC Low byte" = 82h

Command to Read "Temperature ADC High byte" = 84h

Command to Read "Temperature ADC Low byte" = 86h

Command to Read "Coefficient data byte 1 High byte" = 88h

Read coefficients:

[CS=0], [88h], [00h], [8Ah], [00h], [8Ch], [00h], [8Eh], [00h], [90h], [00h], [92h], [00h], [94h], [00h], [96h], [00h],

[00h], [CS=1]

Start pressure and temperature conversion, read raw pressure:

[CS=0], [24h], [00h], [CS=1], [3 ms Delay]

[CS=0], [80h], [00h], [82h], [00h], [84h], [00h], [86h], [00h], [00h], [CS=1]

Note: Extra [00h] at the end of each sequence to output the last data byte on the client side of the SPI.

MPL115A1S

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Product data sheet

Rev. 1.3 — 17 May 2024

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