TDP158 datasheet(31/55 Pages) TI1

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TDP158

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SLLSEX2 – DECEMBER 2016

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The following procedure is followed to write to the TDP158 I2C registers:

1. The master initiates a write operation by generating a start condition (S), followed by the TDP158 7-bit

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

2. The TDP158 acknowledges the address cycle.

3. The master presents the sub-address (I2C register within TDP158) to be written, consisting of one byte of

data, MSB-first.

4. The TDP158 acknowledges the sub-address cycle.

5. The master presents the first byte of data to be written to the I2C register.

6. 6. The TDP158 acknowledges the byte transfer.

7. The master may continue presenting additional bytes of data to be written, with each byte transfer completing

with an acknowledge from the TDP158.

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

The following procedure is followed to read the TDP158 I2C registers:

1. The master initiates a read operation by generating a start condition (S), followed by the TDP158 7-bit

address and a one-value “W/R” bit to indicate a read cycle.

2. The TDP158 acknowledges the address cycle.

3. The TDP158 transmit the contents of the memory registers MSB-first starting at register 00h.

4. The TDP158 will wait for either an acknowledge (ACK) or a not-acknowledge (NACK) from the master after

each byte transfer; the I2C master acknowledges reception of each data byte transfer.

5. If an ACK is received, the TDP158 transmits the next byte of data.

6. The master terminates the read operation by generating a stop condition (P).

NOTE

Upon reset, the TDP158 sub-address will always be set to 0x00. When no sub-address is

included in a read operation, the TDP158 sub-address will increment from previous

acknowledged read or write data byte. If it is required to read from a sub-address that is

different from the TDP158 internal sub-address, a write operation with only a sub-address

specified is needed before performing the read operation.

Refer to Local I2C Control BIT Access TAG Convention for TDP158 local I2C register descriptions. Reads from

reserved fields or addresses not specified return zeros. If they are written to and then read they will read back

what was written but will not impact the device features or performance.

8.5.1 Local I2C Control BIT Access TAG Convention

Reads from reserved fields shall return zero, and writes to read-only reserved registers shall be ignored. Writes

to reserved register which are marked with ‘W’ will produce unexpected behavior. All addresses not defined by

this specification shall be considered reserved. Reads from these addresses shall return zero and writes shall be

ignored

8.5.2 BIT Access Tag Conventions

A table of bit descriptions is typically included for each register description that indicates the bit field name, field

description, and the field access tags. The field access tags are described in Table 9.

Table 9. Field Access Tags

Access Tag

Name

DESCRIPTION

Read

The field shall be read by software

Write

The field shall be written by software

Set

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

Clear

The field shall be cleared by a write of one. Writes of Zero to the field have no effect

Update

Hardware may autonomously update this field

No Access

Not accessible or not applicable

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