PCM5142 datasheet(57/123 Pages) TI2

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BUF

S-HD

LOW

D-SU

D-HD

SCL-F

SCL-R

RS-HD

RS-SU

P-SU

SDA

SCL

START

Repeated

START

STOP

SDA-R

SDA-F

PCM5141, PCM5142

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SLAS759B – AUGUST 2012 – REVISED JANUARY 2016

Table 40. Write Operation - Basic I2C Framework

Transmitter

Data Type

slave address

ACK

DATA

ACK

DATA

ACK

Table 41. Read Operation - Basic I2C Framework

Transmitter

Data Type

slave address

ACK

DATA

ACK

DATA

ACK

NACK

M = Master Device; S = Slave Device; St = Start Condition; Sp = Stop Condition

8.4.1.1.2.4

Write Register

A master can write to any PCM514x registers using single or multiple accesses. The master sends a PCM514x

slave address with a write bit, a register address with auto-increment bit, and the data. If auto-increment is

enabled, the address is that of the starting register, followed by the data to be transferred. When the data is

received properly, the index register is incremented by 1 automatically. When the index register reaches 0x7F,

the next value is 0x0. Table 42 shows the write operation.

Table 42. Write Operation

Transmitter

reg

write

Data Type

slave addr

ACK

inc

ACK

addr

data 1

data 2

M = Master Device; S = Slave Device; St = Start Condition; Sp = Stop Condition; W = Write; ACK =

Acknowledge

8.4.1.1.2.5

Read Register

A master can read the PCM514x register. The value of the register address is stored in an indirect index register

in advance. The master sends a PCM514x slave address with a read bit after storing the register address. Then

the PCM514x transfers the data which the index register points to. When auto-increment is enabled, the index

shows the read operation.

Table 43. Read Operation

Transmitter

slave

reg

slave

Data Type

ACK

inc

ACK

data

ACK

NACK

addr

M = Master Device; S = Slave Device; St = Start Condition; Sr = Repeated Start Condition; Sp = Stop Condition;

W = Write; R = Read; NACK = Not acknowledge

8.4.1.1.2.6

Timing Characteristics

Figure 76. Register Access Timing

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