TMDS361 datasheet(33/42 Pages) TI

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Acknowledge

(FromReceiver)

Start

Condition

Acknowledge

(Receiver)

Acknowledge

(Receiver)

SDA

Stop

Condition

I CDevice Addressand

Read/WriteBit

FirstDataByte

Other

DataBytes

LastDataByte

ACK

R/W

D0 ACK

ACK

T0397-01

Slave Address

Data

Receiver

Transmitter

A =No Acknowledge(SDA High)

A = Acknowledge

S=StartCondition

P =StopCondition

W=Write

R=Read

R0008-01

Start

Condition

SDA

Acknowledge

(FromReceiver)

Acknowledge

(From Transmitter)

Not Acknowledge

(Transmitter)

Stop

Condition

LastDataByte

I CDevice Addressand

Read/WriteBit

FirstData

Byte

Other

DataBytes

ACK

R/W

ACK

T0398-01

Slave Address

EXAMPLE – WRITING TO THE TMDS361

TMDS361

www.ti.com............................................................................................................................................................................................ SLLS919 – DECEMBER 2008

Figure 41. Multiple-Byte Write Transfer

Figure 42. I2C Read Cycle

Figure 43. Multiple-Byte Read Transfer

Both SDA and SCL must be connected to a positive supply voltage via a pullup resistor. These resistors should

comply with the I2C specification that ranges from 2 k

Ω to 19 kΩ. When the bus is free, both lines are high. The

address byte is the first byte received following the START condition from the master device. The 7-bit address is

factory preset to 0101 100. Table 7 lists the calls that the TMDS361 responds to.

Table 7. TMDS361 Slave Address

FIXED ADDRESS

READ/WRITE BIT

Bit 7 (MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (R/W)

1/0

The proper way to write to the TMDS361 is illustrated as follows:

An I2C master initiates a write operation to the TMDS361 by generating a start condition (S) followed by the

TMDS361 I2C address (as shown following, in MSB-first bit order, followed by a 0 to indicate a write cycle. After

receiving an acknowledge from the TMDS361, the master presents the subaddress (sink port) to be written,

consisting of one byte of data, MSB-first. The TMDS361 acknowledges the byte after completion of the transfer.

Finally, the master presents the data to be written to the register (sink port), and the TMDS361 acknowledges the

byte. The master can continue presenting data to be written after TMDS361 acknowledges the previous byte

(steps 6, 7). After the last byte to be written has been acknowledged by TMDS361, the I2C master then

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

Step 1

I2C start (master)

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