AD8192 datasheet(16/28 Pages) AD

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AD8192

Rev. 0 | Page 16 of 28

START

FIXED PART

ADDR

FIXED PART

ADDR

DATA

STOP

ACK

ADDR

ACK

R/W

ADDR

ACK

NACK

R/W

9 10 11

I2C_SCL

GENERAL CASE

I2C_SDA

EXAMPLE

I2C_SDA

Figure 29. I2C Read Procedure

READ PROCEDURE

To read data from the AD8192 register set, an I2C master (such

as a microcontroller) needs to send the appropriate control

signals to the AD8192 slave device. The signals are controlled

by the I2C master unless otherwise specified. For a diagram of

the procedure, see Figure 29. The steps for a read procedure are

as follows:

Send a start condition (while holding the I2C_SCL line

high, pull the I2C_SDA line low).

Send the AD8192 part address (seven bits). The upper six

bits of the AD8192 part address are the static value

[100100], and the LSB is set by Input Pin I2C_ADDR. This

transfer should be MSB first.

Send the write indicator bit (0).

Wait for the AD8192 to acknowledge the request.

Send the register address (eight bits) from which data is to

be read. This transfer should be MSB first.

Wait for the AD8192 to acknowledge the request.

Send a repeated start condition (Sr) by holding the

I2C_SCL line high and pulling the I2C_SDA line low.

Resend the AD8192 part address (seven bits) from Step 2.

The upper six bits of the AD8192 part address compose the

static value [100100]. The LSB is set by Input Pin I2C_ADDR.

This transfer should be MSB first.

Send the read indicator bit (1).

10. Wait for the AD8192 to acknowledge the request.

The AD8192 serially transfers the data (eight bits) held in

the register indicated by the address set in Step 5. This data

is sent MSB first.

11. Capture the data from the AD8192.

12. Do one of the following:

Send a no acknowledge followed by a stop condition

(while holding the I2C_SCL line high, pull the SDA

line high) and release control of the bus to end the

transaction (shown in Figure 29).

Send a no acknowledge followed by a repeated start

condition (while holding the I2C_SCL line high, pull

the I2C_SDA line low) and continue with Step 2 of the

write procedure (see the previous Write Procedure

section) to perform a write.

Send a no acknowledge followed by a repeated start

condition (while holding the I2C_SCL line high, pull

the I2C_SDA line low) and continue with Step 2 of

this procedure to perform a read from another

address.

Send a no acknowledge followed by a repeated start

condition (while holding the I2C_SCL line high, pull

the I2C_SDA line low) and continue with Step 8 of

this procedure to perform a read from the same

address.

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