AD8190ACPZ-R7 datasheet(14/24 Pages) AD

14 / 24 page

AD8190

Rev. 0 | Page 14 of 24

SERIAL CONTROL INTERFACE

RESET

On initial power-up, or at any point in operation, the AD8190

RESET pin to low according to the specification in Table 1.

During normal operation, however, the RESET pin must be

pulled up to 3.3 V. Pulling the RESET pin to low sets the

HS_CH register to 0 (Input A) and incurs the associated

switching delay before the input can be switched to Input B,

regardless of the previous state of the AD8190.

WRITE PROCEDURE

To write data to the AD8190 register set, an I2C master (such as

a microcontroller) needs to send the appropriate control signals

to the AD8190 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 write procedure are as

follows:

Send a start condition (while holding the I2C_SCL line

high, pull the I2C_SDA line low).

Send the AD8190 part address (seven bits). The upper six

bits of the AD8190 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 AD8190 to acknowledge the request.

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

written. This transfer should be MSB first.

Wait for the AD8190 to acknowledge the request.

Send the data (eight bits) to be written to the register

whose address was set in Step 5. This transfer should be

MSB first.

Wait for the AD8190 to acknowledge the request.

Do one of the following:

Send a stop condition (while holding the I2C_SCL

line high, pull the I2C_SDA line high) and release

control of the bus to end the transaction (shown in

Figure 29).

Send a repeated start condition (while holding the

I2C_SCL line high, pull the I2C_SDA line low) and

continue with Step 2 in this procedure to perform

another write.

Send a repeated start condition (while holding the

I2C_SCL line high, pull the I2C_SDA line low) and

continue with Step 2 of the read procedure (in the

Read Procedure section) to perform a read from

another address.

Send a repeated start condition (while holding the

I2C_SCL line high, pull the I2C_SDA line low) and

continue with Step 8 of the read procedure (in the

Read Procedure section) to perform a read from the

same address set in Step 5.

R/W

ACK

ADDR

START

FIXED ADDR PART

DATA

STOP

ACK

I2C_SCL

GENERAL CASE

I2C_SDA

EXAMPLE

I2C_SDA

*THE SWITCHING/UPDATE DELAY BEGINS AT THE FALLING EDGE OF THE

LAST DATA BIT; FOR EXAMPLE, THE FALLING EDGE JUST BEFORE STEP 8.

Figure 29. I2C Write Procedure

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