TLV320AIC21 datasheet(36/56 Pages) TI1

36 / 56 page

www.ti.com

I2C Write Sequence

SCL

SDA

0 ACK B7

I2C

ACK

Programmable 12C Device Address

Set by Control Register 2

Start Bit = 0

SMARTDM Device

Address

(see Table 3-1)

00000 = Default

11111 = Broadcast Mode

Index Register Address

(Index)

Control Register Data for Write

(Index)

Control Register Data for Write

(Index+1)

SCL

SDA

ACK

I2C

ACK

I2C

SCL

SDA

ACK

I2C

ACK

Start Bit = 0

Programmable 1 C Device Address

Set by Control Register 2

SMARTDM Device Address

(see Table 1)

Index Register Address

(Index)

Stop Bit = 1

xxxxx = Don't Care

Start Bit = 0

Programmable 1 C Device Address

Set by Control Register 2

SMARTDM Device Address

(see Table 1)

Control Register Data

(Index)

Control Register Data

(Index+1)

I C Read Sequence

TLV320AIC20, TLV320AIC21

TLV320AIC24, TLV320AIC25

TLV320AIC20K, TLV320AIC24K

SLAS363D – MARCH 2002 – REVISED APRIL 2005

I2C

•

Each I

2C read-from or write-to each codec control register is given by an index register address.

•

Read/write sequence always starts with the first byte as I

2C address followed by 0. During the second byte,

default/broadcast mode is set and the index register address is initialized. For write operation control register,

data to be written is given from the third byte onwards. For read operation, stop-start is performed after the

second byte. Now the first byte is I

2C address followed by 1. From the second byte onwards, control register

data appears.

•

Each time read/write is performed, the index register address is incrimented so that the next read/write is

performed on the next control register.

•

During the first write cycle and all write cycles in the broadcast, only the device with address 0000 issues

ACK to the I

2C.

•

Similarly, for a register with multiple sub-registers the sub-register index automatically increments with each

read/write. For example, the first read/write to register 3 read/writes to register 3A, the next to register 3B

and so forth until the last sub-register is reached. At this time the sub-register index wraps back around to

the first sub-register

Figure 31. I2C Write Sequence

Figure 32. I2C Read Sequence

Each codec has an index register address. To perform a write operation, make the LSB of the first byte as 0

(write) (see Figure 33). During the second byte, the index register address is initialized and mode

(broadcast/default) is set. From the third byte onwards, write data to the control register (given by index register)

and increment the index register until stop or repeated start occurs. For operation, make the LSB of the first byte

as 1 (read). From the second byte onwards, AIC starts transmitting data from the control register (given by the

index register) and increments the index register. For setting the index register perform operation the same as

write case for 2 bytes, and then give a stop or repeated start.

TLV320AIC21 датащи(PDF) 36 Page - Texas Instruments

TLV320AIC21 датащи(HTML) 36 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

датащи скачать

ссылки URL