TMP126 datasheet(19/48 Pages) TI

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8.5.2.1 Command Word Structure

Figure 8-10 shows that the command word can be divided into 6 discrete sections detailed below.

R/W

Peripheral controls SIO line

Controller controls SIO line

Auto Increment

X CRC L4

R/W

Sub-Address

CRC Data Block Length

CS Pulled low

CRC Enable

Don’t Care

Figure 8-10. TMP126 Command Word

8.5.2.1.1 Don't Care

Bit 15 of the command word is a don't care and the TMP126-Q1 will ignore this bit.

8.5.2.1.2 CRC Enable

Bit 14 of the command word is the CRC enable bit. Setting this bit to 1 will enable the CRC checksum at the end

of the communication as described in the CRC section.

8.5.2.1.3 CRC Data Block Length

Bits [13:10] of the command word is the CRC data block length. These bits are used to indicate how long the

transaction will be when the CRC checksum is used. If these bits are all set to 0 or the combination of the bits

set to 1 exceeds 1010 (i. e. 1011, 1100, 1101, 1110 or 1111), the CRC enable will be ignored.

8.5.2.1.4 Auto Increment

Bit 9 of the command word is the auto-increment bit.

Setting this bit to 1 will cause the address pointer of the TMP126-Q1 to increment by after every word of data

on a read or write transaction. If the bit is set to 0, the address pointer is not incremented and reads/writes will

continue to only apply the Sub-Address specified in the command word.

8.5.2.1.5 Read/Write

Bit 8 of the command word is the read/write bit.

Setting this bit to 1 will issue a read command. During a read command the TMP126-Q1 will control the SIO pin

after the command word. Setting this bit to 0 will issue a write command. During a write command the controller

will control the SIO pin and the TMP126-Q1 will internally set the SIO pin to high impedance.

8.5.2.1.6 Sub-Address

Bits [7:0] of the command word make up the register Sub-Address.

This is the register map address that will be used for reading or writing data depending on the read/write

bit. Writes to Sub-Addresses outside the register map will be ignored. Reads from Sub-Addresses outside the

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TMP126-Q1

SNIS227C – MAY 2021 – REVISED JUNE 2022

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