MAX7469UTP-T Maxim Integrated, MAX7469UTP-T Datasheet - Page 13

• Manufacturer Part Number: MAX7469UTP-T
• Description: Video ICs
• Manufacturer: Maxim Integrated

write sequence must be repeated. Figures 6 and 7
show examples of write sequences.
In read mode (R/W = 1), the MAX7469/MAX7470 write
the contents of the control/status or frequency registers
to the bus. When the command byte indicates a read
operation of either the control/status or the frequency
register, the serial interface expects an Sr condition to
Figure 6. Write Sequence to Update the Frequency Register
Figure 7. Write Sequence for a Command Byte
DIRECTION
DIRECTION
DIRECTION
SCL (CONT)
SDA (CONT)
SDA
SDA
SDA
SDA
SCL
SDA
SCL
COMMAND BYTE C7–C0 IS 0010010.
START
START
1
1
F7
______________________________________________________________________________________
THE COMMAND BYTE IS FOR POWER-DOWN.
IN TO MAX7469/MAX7470
0
0
F6
0
IN TO MAX7469/MAX7470
0
F5
1
1
F4
IN
0
0
F3
A1
A1
Read Cycle
F2
A0
A0
HDTV Continuously Variable
F1
R/W
R/W
F0
OUT
ACK
OUT
ACK
ACK
OUT
follow the command byte. After sending an Sr, the mas-
ter sends the MAX7469/MAX7470 slave address byte
followed by a R/W bit (set to 1 to indicate a read). The
slave device (MAX7469/MAX7470) generates an ACK
for the second address word and immediately after the
ACK clock pulse, the direction of data flow reverses.
The slave (MAX7469/MAX7470) then transmits 1 byte of
data containing the value of the register that was
C7
0
C7
0
STOP
IN
C6
0
Anti-Aliasing Filters
C6
0
C5
0
C5
0
C4
0
C4
1
IN
IN
C3
0
C3
0
C2
0
C2
0
C1
0
C1
1
C0
0
C0
0
ACK
OUT
ACK
OUT
STOP
IN
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