參數(shù)資料
型號(hào)： AD8197AASTZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 7/28頁(yè)
文件大小： 0K
描述： IC HDMI/DVI SWITCH 4:1 100LQFP
標(biāo)準(zhǔn)包裝： 1
功能： 開關(guān)
電路： 1 x 16:1
電壓電源： 單電源
電壓 - 電源，單路/雙路(±)： 3 V ~ 3.6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 100-LQFP
供應(yīng)商設(shè)備封裝： 100-LQFP（14x14）
包裝： 托盤
AD8197A
Rev. 0 | Page 15 of 28
SERIAL CONTROL INTERFACE
RESET
On initial power-up, or at any point in operation, the AD8197A
register set can be restored to preprogrammed default values by
pulling the RESET pin low in accordance with the specifications
in Table 1. During normal operation, however, the RESET pin
must be pulled up to 3.3 V. Following a reset, the preprogrammed
default values of the AD8197A register set correspond to the
state of the parallel interface configuration registers, as listed
in Table 18. The AD8197A 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 (see 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 AD8197A register set, an I2C master (such
as a microcontroller) needs to send the appropriate control
signals to the AD8197A 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 AD8197A part address (seven bits). The upper
four bits of the AD8197A 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 AD8197A 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 AD8197A 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 AD8197A 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
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
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.
*
07
01
4-
02
9
Figure 29. I2C Write Diagram
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