SLAS366 datasheet(22/58 Pages) TI2

22 / 58 page

3–10

SCL

SDA

ACK

SCL

SDA

ACK

Start Bit = 0

Programmable I2C Device Address

Set by Control Register 2

SMARTDM Device Address

(see Table 3-1)

Index Register Address

(Index)

Stop Bit = 1

xxxxx = Don’t Care

Start Bit = 0

SMARTDM Device Address

(see Table 3-1)

Control Register Data

(Index)

Control Register Data

(Index+1)

I2C Read Sequence

I2CI2C

I2C

Programmable I2C Device Address

Set by Control Register 2

I2CI2C

I2C

Figure 3–11. I2C Read Sequence

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

Figure 3–12). 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

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.

S/Sr –> Start/Repeated Start.

S/Sr

I2C Device Address (3 Bit)+

Dtdmsp Device Address (+)

R/W

= 0

Mode (5 Bit) + Index Reg

Address

(3 Bit)

Ack

Control Reg. Data

(Write)

Ack

Control Reg. Data

(Write)

7 Bit

1 Bit

8 Bit

Increment Index Reg. Address

Default/Broadcast

(00000/11111)

Write Mode

To The Address Given

by Index Reg. Address

To The Address Given

by Index Reg. Address

S/Sr

I2C Device Address (3 Bit)+

Dtdmsp Device Address (+)

R/W

= 1

Control Reg. Data

(Read)

Ack

Control Reg. Data

(Read)

Ack

7 Bit

1 Bit

8 Bit

Read Mode

From The Address Given

by Index Reg. Address

From The Address Given

by Index Reg. Address

Increment Index Reg. Address

S/Sr

I2C Device Address (3 Bit)+

Dtdmsp Device Address (+)

R/W

= 0

Mode (5 Bit) + Index Reg.

Address

(3 Bit)

Ack

7 Bit

1 Bit

8 Bit

For Initializing Index Reg Address

Stop

Figure 3–12. Index Register Addresses

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