PCM5142A datasheet(56/123 Pages) TI2

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SDA

SCL

Start

condition

1–7

1–8

Stop

condition

Slave address

R/W

ACK

DATA

ACK

DATA

ACK

R/W:

Read operation if 1; otherwise, write operation

ACK:

Acknowledgement of a byte if 0

DATA:

8 bits (byte)

MSB

LSB

INC

PCM5141, PCM5142

SLAS759B – AUGUST 2012 – REVISED JANUARY 2016

www.ti.com

8.4.1.1.2

2C Interface

The PCM514x supports the I2C serial bus and the data transmission protocol for standard and fast mode as a

slave device.

In I2C mode, the control terminals are changed as follows.

Table 38. I2C Pins and Functions

SIGNAL

I/O

DESCRIPTION

SDA

I/O

I2C data

SCL

I2C clock

ADR2

I2C address 2

ADR1

I2C address 1

8.4.1.1.2.1

Slave Address

Table 39. I2C Slave Address

MSB

LSB

ADR2

ADR1

R/ W

The PCM514x has 7 bits for its own slave address. The first five bits (MSBs) of the slave address are factory

preset to 10011 (0x9x). The next two bits of the address byte are the device select bits which can be user-

defined by the ADR1 and ADR0 terminals. A maximum of four devices can be connected on the same bus at

one time. This gives a range of 0x98, 0x9A, 0x9C and 0x9E. Each PCM514x responds when it receives its own

slave address.

8.4.1.1.2.2

Figure 74. Auto Increment Mode

Auto-increment mode allows multiple sequential register locations to be written to or read back in a single

operation, and is especially useful for block write and read operations.

8.4.1.1.2.3

Packet Protocol

A master device must control packet protocol, which consists of start condition, slave address, read/write bit,

data if write or acknowledge if read, and stop condition. The PCM514x supports only slave receivers and slave

transmitters.

Figure 75. Packet Protocol

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