TMP126 datasheet(19/45 Pages) TI

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8.5.2.2 Communication

Communication is initiated by taking the CS pin low and clocking the SCLK pin. The first 16 bits of the

communication are the command word for the TMP126. The following data will depend on the command byte.

If a write command is issued, the TMP126 will store the data input during the next 16 bits into the appropriate

Sub-Address set in the command byte. If the auto-increment bit is set to '1', the address pointer is incremented

after every 16-bit word. This allows the system to program all the registers of the TMP126 in a single burst write

command. If the auto-increment is set to '1' for a read command, after each 16-bit word the address pointer is

incremented and the next word of data will be from the next Sub-Address.

The following sections denote example write and read operations with the TMP126.

8.5.2.3 Write Operations

Data is transmitted to the TMP126 by setting the R/W bit of the command word to logic '0'. Data can be

continuously written to a single register by setting the auto-increment bit to '0' in the command register. Figure

8-11 shows an example of a repeated data write to a single register.

R/W

Peripheral controls SIO line

Controller controls SIO line

Auto Increment

Sub-Address

CS pulled low

D15 D14 D13 D12 D11 D10 D9

Data Word

Data to Register N

D15 D14 D13 D12 D11 D10 D9

Data Word

Data to Register N

D15 D14 D13 D12 D11 D10 D9

Data Word

Data to Register N

CS pulled high

CRC Data Block Length

CRC Enable

Don’t Care

CRC L4

Figure 8-11. Repeated Data Write to a Single Register

Figure 8-12 shows how setting the auto increment to logic '1' to can enable a write from multiple registers in a

single transaction.

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TMP126

SNIS209 – JULY 2021

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