NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
8.2 System configuration
A device generating a message is a ‘transmitter ’; a device receiving is the ‘receiver ’. The
device that controls the message is the ‘master ’ and the devices which are controlled by
the master are the ‘slaves’ (see Figure 11 ).
USDA
MASTER UFm
TRANSMITTER
USCL
SLAVE UFm
RECEIVER
SLAVE UFm
RECEIVER
SLAVE UFm
RECEIVER
002aaf100
Fig 11. System configuration
8.3 Data transfer
The number of data bytes transferred between the START and the STOP conditions from
transmitter to receiver is not limited. Each byte of eight bits is followed by one bit that is
always set to 1. The master generates an extra related clock pulse.
USDA data output by
master UFm transmitter
USCL clock from master
1
2
8
9
S
START
Fig 12. Data transfer
condition
002aaf101
PCU9955
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 2 October 2012
? NXP B.V. 2012. All rights reserved.
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