ADV7183AKST Analog Devices Inc, ADV7183AKST Datasheet - Page 63

• Manufacturer Part Number: ADV7183AKST
• Description: IC VIDEO DECODER NTSC 80-LQFP
• Manufacturer: Analog Devices Inc
• Type: Video Decoderr

Specifications of ADV7183AKST

• Applications: Projectors, Recorders, Security
• Voltage - Supply, Analog: 3.15 V ~ 3.45 V
• Voltage - Supply, Digital: 1.65 V ~ 2 V
• Mounting Type: Surface Mount
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MPU PORT DESCRIPTION
The ADV7183A supports a 2-wire (I
face. Two inputs, serial data (SDA) and serial clock (SCLK),
carry information between the ADV7183A and the system I
master controller. Each slave device is recognized by a unique
address. The ADV7183A’s I
configure the decoder and to read back captured VBI data. The
ADV7183A has four possible slave addresses for both read and
write operations, depending on the logic level on the ALSB pin.
These four unique addresses are shown in Table 169. The
ADV7183A’s ALSB pin controls Bit 1 of the slave address. By
altering the ALSB, it is possible to control two ADV7183As in
an application without having a conflict with the same slave
address. The LSB (Bit 0) sets either a read or write operation.
Logic 1 corresponds to a read operation; Logic 0 corresponds
to a write operation.
Table 169. I
ALSB
0
0
1
1
To control the device on the bus, a specific protocol must be
followed. First, the master initiates a data transfer by establish-
ing a start condition, which is defined by a high-to-low
transition on SDA while SCLK remains high. This indicates that
an address/data stream will follow. All peripherals respond to
the start condition and shift the next eight bits (7-bit address +
R/W bit). The bits are transferred from MSB down to LSB. The
peripheral that recognizes the transmitted address responds by
pulling the data line low during the ninth clock pulse; this is
known as an acknowledge bit. All other devices withdraw from
the bus at this point and maintain an idle condition. The idle
condition is where the device monitors the SDA and SCLK
lines, waiting for the start condition and the correct transmitted
2
C Address for ADV7183A
SEQUENCE
SEQUENCE
R/W
0
1
0
1
WRITE
READ
S
S
S = START BIT
P = STOP BIT
SLAVE ADDR A(S)
SLAVE ADDR
2
C port allows the user to set up and
Slave Address
0x40
0x41
0x42
0x43
SCLOCK
SDATA
2
C-compatible) serial inter-
LSB = 0
A(S)
A(S) = ACKNOWLEDGE BY SLAVE
A(M) = ACKNOWLEDGE BY MASTER
START ADDR
S
SUB ADDR
SUB ADDR
1–7
R/W
Figure 37: Read and Write Sequence
8
A(S)
A(S) S
ACK
Figure 36. Bus Data Transfer
9
Rev. B | Page 63 of 104
2
C
SUBADDRESS
SLAVE ADDR
DATA
1–7
LSB = 1
8
A(S)
A(S) = NO-ACKNOWLEDGE BY SLAVE
A(M) = NO-ACKNOWLEDGE BY MASTER
ACK
address. The R/W bit determines the direction of the data.
Logic 0 on the LSB of the first byte means the master will write
information to the peripheral. Logic 1 on the LSB of the first
byte means the master will read information from the
peripheral.
The ADV7183A acts as a standard slave device on the bus. The
data on the SDA pin is eight bits long, supporting the 7-bit
addresses plus the R/W bit. The ADV7183A has 196 subad-
dresses to enable access to the internal registers. It interprets the
first byte as the device address and the second byte as the starting
subaddress. The subaddresses auto-increment, allowing data to
be written to or read from the starting subaddress. A data
transfer is always terminated by a stop condition. The user can
also access any unique subaddress register on a one-by-one
basis without updating all the registers.
Stop and start conditions can be detected at any stage during the
data transfer. If these conditions are asserted out of sequence with
normal read and write operations, they cause an immediate
jump to the idle condition. During a given SCLK high period,
the user should issue only one start condition, one stop condition,
or a single stop condition followed by a single start condition. If
an invalid subaddress is issued by the user, the ADV7183A
cannot issue an acknowledge and returns to the idle condition.
If in auto-increment mode the user exceeds the highest
subaddress, the following action is taken:
1.
2.
A(S)
9
In read mode, the highest subaddress register contents
continue to be output until the master device issues a no-
acknowledge. This indicates the end of a read. A no-
acknowledge condition is where the SDA line is not pulled
low on the ninth pulse.
In write mode, the data for the invalid byte is not loaded
into any subaddress register, a no acknowledge is issued by
the ADV7183A, and the part returns to the idle condition.
1–7
DATA
DATA
8
DATA
ACK
A(M)
9
STOP
P
A(S) P
DATA
A(M) P
ADV7183A