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TDP142

SLLSEZ1C – SEPTEMBER 2017 – REVISED MAY 2019

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The following procedure should be followed for setting a starting sub-address for I2C reads:

1. The master initiates a write operation by generating a start condition (S), followed by the TDP142 7-bit

address and a zero-value “W/R” bit to indicate a write cycle.

2. The TDP142 acknowledges the address cycle.

3. The master presents the sub-address (I2C register within TDP142) to be written, consisting of one byte of

data, MSB-first.

4. The TDP142 acknowledges the sub-address cycle.

5. The master terminates the write operation by generating a stop condition (P).

NOTE

If no sub-addressing is included for the read procedure, and reads start at register offset

00h and continue byte by byte through the registers until the I2C master terminates the

read operation. If a I2C address write occurred prior to the read, then the reads start at the

sub-address specified by the address write.

Table 5. Register Legend

ACCESS TAG

NAME

MEANING

R

Read

The field may be read by software

W

Write

The field may be written by software

S

Set

The field may be set by a write of one. Writes of zeros to the field have no effect.

C

Clear

The field may be cleared by a write of one. Write of zero to the field have no effect.

U

Update

Hardware may autonomously update this field.

NA

No Access

Not accessible or not applicable