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AD8197 Datasheet(PDF) 16 Page - Analog Devices

Part No. AD8197
Description  4:1 HDMI/DVI Switch with Equalization
Download  32 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8197 Datasheet(HTML) 16 Page - Analog Devices

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AD8197
Preliminary Technical Data
PrA| Page 16 of 32
SERIAL CONTROL INTERFACE
RESET
On initial power-up, or at any point in operation, the AD8197
register set can be restored to preprogrammed default values by
pulling the RESET pin to low in accordance with the specifica-
tions in Table 1. During normal operation, however, the RESET
pin must be pulled up to 3.3 V. Following a reset, the prepro-
grammed default values of the AD8197 register set correspond
to the state of the parallel interface configuration registers, as
listed in Table 24. The AD8197 can be controlled through the
parallel control interface until the first serial control event
occurs. As soon as any serial control event occurs, the serial
programming values, corresponding to the state of the serial
interface configuration registers (Table 5), override any prior
parallel programming values, and the parallel control interface
is disabled until the part is subsequently reset.
WRITE PROCEDURE
To write data to the AD8197 register set, an I2C master (such as
a microcontroller) needs to send the appropriate control signals
to the AD8197 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:
1.
Send a start condition (while holding the I2C_SCL line
high, pull the I2C_SDA line low).
2.
Send the AD8197 part address (seven bits). The upper four
bits of the AD8197 part address are the static value [1001]
and the three LSBs are set by Input Pin I2C_ADDR2, Input
Pin I2C_ADDR1, and Input Pin I2C_ADDR0 (LSB). This
transfer should be MSB first.
3.
Send the write indicator bit (0).
4.
Wait for the AD8197 to acknowledge the request.
5.
Send the register address (eight bits) to which data is to be
written. This transfer should be MSB first.
6.
Wait for the AD8197 to acknowledge the request.
7.
Send the data (eight bits) to be written to the register
whose address was set in Step 5. This transfer should be
MSB first.
8.
Wait for the AD8197 to acknowledge the request.
9.
Perform one of the following:
9a. 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).
9b. 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.
9c. 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.
9d. 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
ACK
ADDR
START
FIXED PART
ADDR
REGISTER ADDR
DATA
STOP
ACK
1
2
3
4
5
6
7
8
9
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 Diagram


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