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| 型号： | AD8191ASTZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/32页 |
| 文件大小： | 0K |
| 描述： | IC INTERFACE HDMI/DVI 100-LQFP |
| 标准包装： | 1,000 |
| 功能： | 开关，DVI/HDMI |
| 电路： | 1 x 16:1 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 100-LQFP |
| 供应商设备封装： | 100-LQFP（14x14） |
| 包装： | 带卷 (TR) |
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AD8191
Rev. 0 | Page 17 of 32
START
FIXED PART
ADDR
REGISTER ADDR
FIXED PART
ADDR
DATA
STOP
ACK
ADDR
ACK
R/W
ADDR
ACK
R/W
SR
1
2
3
4
5
6
7
8
9 10 11
12
13
I2C_SCL
GENERAL CASE
I2C_SDA
EXAMPLE
I2C_SDA
06
12
3-
0
09
Figure 30. I2C Read Diagram
READ PROCEDURE
To read data from the AD8191 register set, an I2C master (such
as a microcontroller) needs to send the appropriate control
signals to the AD8191 slave device. The signals are controlled
by the I2C master, unless otherwise specified. For a diagram of
the procedure, see Figure 30. The steps for a read 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 AD8191 part address (seven bits). The upper four
bits of the AD8191 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 AD8191 to acknowledge the request.
5.
Send the register address (eight bits) from which data is to
be read. This transfer should be MSB first.
6.
Wait for the AD8191 to acknowledge the request.
7.
Send a repeated start condition (Sr) by holding the
I2C_SCL line high and pulling the I2C_SDA line low.
8.
Resend the AD8191 part address (seven bits) from Step 2.
The upper four bits of the AD8191 part address are the
static value [1001] and the three LSBs are set by the Input
Pin I2C_ADDR2, I2C_ADDR1 and Input Pin I2C_ADDR0
(LSB). This transfer should be MSB first.
9.
Send the read indicator bit (1).
10. Wait for the AD8191 to acknowledge the request.
11. The AD8191 serially transfers the data (eight bits) held in
the register indicated by the address set in Step 5. This data
is sent MSB first.
12. Acknowledge the data from the AD8191.
13. Perform one of the following:
13a. S
op 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
end a st
).
13b.
ated start condition (while holding the
13c.
13d.
on (while holding the
Send a repe
I2C_SCL line high, pull the I2C_SDA line low) and
continue with Step 2 of the write procedure (previous
Write Procedure section) to perform a 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 this procedure to perform a
read from another address.
Send a repeated start conditi
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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