TDA6920 Datasheet, PDF (9/20 Pages) Siemens Semiconductor Group – 7 x 5 Video Matrix Switch

TDA 6920
q Data Mode Selections (fast I²C Bus) continued
2nd byte of transmission (8 bit)
Input Selection Non Clamped / Y+C (Y: always clamped. C: non clamped)
(3 bit, bit 7 must always be 0)
b7 b6
b5 b4 b3¹⁾ b2 b1 b0 Selected input
00
XXX
001
in1, (Y+C) off
00
XXX
010
in2, clamp on
00
XXX
011
in3, clamp on
00
XXX
100
in4, clamp on
01
XXX
001
in1, (Y+C) on
01
XXX
010
in2, clamp off
01
XXX
011
in3, clamp off
01
XXX
100
in4, clamp off
1) _{X = don’t care (if only input operation mode change is requested, b5, b4}
b3 should be 0, 0, 0: no output configuration is changed.)
q Bus Protocol (fast I²C Bus)
Programming Example: SDA sequence
start
condition
address 96_H
MSB LSB
1st data: output 4 connect
to input 3 clamped
..... mode output input
serial data stream ₁₀
1001 0110
00 100 011
data: output 5 connect to
input 1 (Y+C)
last data: output 1 connect stop
to input 4 not clamped condition
..... mode output input ..... mode output input
01
101 001
01 001 100 01
Semiconductor Group
9