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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
8. Characteristics of the PCU9955 Ultra Fast-mode I 2 C-bus
The PCU9955 LED controller uses the new Ultra Fast-mode (UFm) I 2 C-bus to
communicate with the UFm I 2 C-bus capable host controller. Like the Standard mode and
Fast-mode Plus (Fm+) I 2 C-bus, it uses two lines for communication. They are a serial data
line (USDA) and a serial clock line (USCL). The UFm is a unidirectional bus that is
capable of higher frequency (up to 5 MHz). The UFm I 2 C-bus slave devices operate in
receive-only mode. That is, only I 2 C writes to PCU9955 are supported.
8.1 Bit transfer
One data bit is transferred during each clock pulse. The data on the USDA line must
remain stable during the HIGH period of the clock pulse as changes in the data line at this
time will be interpreted as control signals (see Figure 9 ).
USDA
USCL
data line
stable;
change
of data
Fig 9.
Bit transfer
data valid
allowed
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8.1.1 START and STOP conditions
Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW
transition of the data line while the clock is HIGH is defined as the START condition (S).
A LOW-to-HIGH transition of the data line while the clock is HIGH is defined as the STOP
condition (P) (see Figure 10 ).
USDA
USCL
S
START condition
P
STOP condition
002aaf114
Fig 10. Definition of START and STOP conditions
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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