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參數(shù)資料
| 型號： | ADV3000ASTZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 消費家電 |
| 英文描述： | 3:1 HDMI/DVI Switch with Equalization |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | 14 X 14 MM, LEAD FREE, MS-026BEC, LQFP-80 |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 608K |
| 代理商： | ADV3000ASTZ |
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ADV3000
Rev. 0 | Page 15 of 28
START
FIXED PART
ADDR
REGISTER ADDR
FIXED PART
ADDR
DATA
STOP
ACK
I2C_ADDR0
ACK
R/W
ADDR
ACK
ACK
R/W
SR
1
2
3
4
5
6
7
8
9 10 11
12
13
I2C_SCL
GENERI2C_SDA
EXAMPLE
I2C_SDA
0
Figure 30. I
2
C Read Diagram
READ PROCEDURE
To read data from the ADV3000 register set, an I
2
C master
(such as a microcontroller) needs to send the appropriate
control signals to the ADV3000 slave device. The signals are
controlled by the I
2
C 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 ADV3000 part address (seven bits). The upper six
bits of the ADV3000 part address are the static value
[100100] and the LSB is set by Input Pin I2C_ADDR0. This
transfer should be MSB first.
3.
Send the write indicator bit (0).
4.
Wait for the ADV3000 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 ADV3000 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 ADV3000 part address (seven bits) from Step 2.
The upper six bits of the ADV3000 part address are the
static value [100100] and the LSB is set by the Input Pin
I2C_ADDR0. This transfer should be MSB first.
9.
Send the read indicator bit (1).
10.
Wait for the ADV3000 to acknowledge the request.
11.
The ADV3000 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 ADV3000.
13.
Perform one of the following:
13a.
S
line high, pull the SDA line high) and release control
of the bus to end the transaction (shown in
13b.
ted start condition (while holding the
Send a repea
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.
ING/UPDATE DELAY
There is a delay between when a user
tion registers of the ADV3000 and when that state change take
physical effect. This update delay occurs regardless of whether
the user programs the ADV3000 via the serial or the parallel
control interface. When using the serial control interface, the
update delay begins at the falling edge of I2C_SCL for the last
data bit transferred, as shown in Figure 29. When using the
parallel control interface, the update delay begins at the
transition edge of the relevant parallel interface pin. This
delay is register specific and the times are specified in Table 1.
During a delay window, new values can be written to the
configuration registers, but the ADV3000 does not physic
update until the end of the delay window of that register. Writing
new values during the delay window does not reset the window;
new values supersede the previously written values. At the end
of the delay window, the ADV3000 physically assumes the state
indicated by the last set of values written to the configuration
registers. If the configuration registers are written after the dela
window ends, the ADV3000 immediately updates and a new
delay window begins.
op condition (while holding the I2C_SCL
end a st
).
13c.
13d.
on (while holding the
SWITCH
writes to the configura-
s
update
ally
y
Figure 30
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