Datasheet

TVP7002
www.ti.com SLES206C –MAY 2007–REVISED APRIL 2013
I
2
C Host Interface
Communication with the TVP7002 device is via an I
2
C host interface. The I
2
C standard consists of two signals,
serial input/output data (SDA) line and input clock line (SCL), which carry information between the devices
connected to the bus. A third signal (I2CA) is used for slave address selection. Although an I
2
C system can be
multi-mastered, the TVP7002 can function as a slave device only.
Since SDA and SCL are kept open drain at logic high output level or when the bus is not driven, the user should
connect SDA and SCL to a positive supply voltage via a pullup resistor on the board. SDA is implemented
bidirectional. The slave addresses select, terminal 73 (I2CA), enables the use of two TVP7002 devices tied to the
same I
2
C bus, as it controls the least significant bit of the I
2
C device address
Table 9. I
2
C Host Interface Terminal Description
SIGNAL TYPE DESCRIPTION
I2CA I Slave address selection
SCL I Input clock line
SDA I/O Input/output data line
Reset and I
2
C Bus Address Selection
The TVP7002 can respond to two possible chip addresses. The I
2
slave address is continuously interpreted from
the logic level present at the I2CA terminal. The I
2
C slave address must be configured with an external
connection to either IOGND (I
2
C address = B8h) or IOVDD (I
2
C address= BAh). A 2.2-kΩ pullup or pulldown
resistor may be used for this connection.
Table 10. I
2
C Host Interface Device Addresses
A6 A5 A4 A3 A2 A1 A0 (I2CA) R/W HEX
1 0 1 1 1 0 0
(1)
1/0 B9h/B8h
1 0 1 1 1 0 1
(2)
1/0 BBh/BAh
(1) If I2CA terminal 73 is strapped to IOGND, I
2
C device address A0 is set to 0.
(2) If I2CA terminal 73 is strapped to IOVDD, I
2
C device address A0 is set to 1.
I
2
C Operation
Data transfers occur utilizing the following illustrated formats.
S 10111000 ACK Subaddress ACK Send data ACK P
Read from I
2
C control registers
S 10111000 ACK Subaddress ACK S 10111001 ACK Receive data NAK P
S = I
2
C bus Start condition
P = I
2
C bus Stop condition
ACK = Acknowledge generated by the slave
NAK = Acknowledge generated by the master, for multiple byte read master with ACK each byte except last byte
Subaddress = Subaddress byte
Data = Data byte, if more than one byte of DATA is transmitted (read and write), the subaddress pointer is
automatically incremented
I
2
C bus address = Example shown that I2CA is in default mode; write (B8h), read (B9h).
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