Data Sheet

© 2012 Fairchild Semiconductor Corporation www.fairchildsemi.com
FMS6501A • Rev. 1.0.0 8
FMS6501A — 12x9 Video Switch Matrix with Input Clamp, Input Bias Circuitry, and Output Drivers
Figure 6. Acknowledgement on the I
2
C Bus®
I
2
C Bus Protocol
Before any data is transmitted on the I
2
C Bus, the
device that should respond is addressed first. The
addressing is always carried out with the first byte
transmitted after the START procedure. The I
2
C bus
configuration for a data write to the FMS6501 is shown
in Figure 7.
Figure 7. Write a Register Address to the Pointer Register, Then Write Data to the Selected Register
SCL FROM
MASTER
DATA OUTPUT
BY TRANSMITTER
DATA OUTPUT
BY RECEIVER
START
condition
12 89
clock pulse for
acknowledgement