How to obtain temperature values in C

TN1180

When reading the temperature values it is also important to note the byte ordering. This is

especially true in auto-increment mode in which case address 2Bh is read first, followed by

address 2Ch. The designer should assemble the proper 16-bit endian format (temperature

count = 2Ch & 2Bh).

The following registers in the device are two’s complement. All other registers in the device

are either unsigned or bitwise representations (not negative).

Table 1: Pressure sensor two's complement registers

Function

Bytes

Description

PRESS_OUT()

2Ah & 29h & 28h

24-bit absolute pressure data or this contains the

difference in pressure between Ref_P() and

Press_Out() when auto-zero mode is used

TEMP_OUT()

2Bh & 2Ch

16-bit temperature data

REF_P()

0Ah & 09h & 08h

24-bit absolute pressure in auto-zero mode

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