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PCU9955 Datasheet

16-channel UFm I2C-bus 57mA constant current LED driver

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PCU9955
16-channel UFm I2C-bus 57 mA constant current LED driver
Rev. 2.1 — 29 June 2015
Product data sheet
1. General description
The PCU9955 is an Ultra-Fast mode (UFm) I2C-bus controlled 16-channel constant
current LED driver optimized for dimming and blinking 57 mA Red/Green/Blue/Amber
(RGBA) LEDs in amusement products. Each LEDn output has its own 8-bit resolution
(256 steps) fixed frequency individual PWM controller that operates at 31.25 kHz with a
duty cycle that is adjustable from 0 % to 99.6 % to allow the LED to be set to a specific
brightness value. An additional 8-bit resolution (256 steps) group PWM controller has both
a fixed frequency of 122 Hz and an adjustable frequency between 15 Hz to once every
16.8 seconds with a duty cycle that is adjustable from 0 % to 99.6 % that is used to either
dim or blink all LEDs with the same value.
Each LEDn output can be off, on (no PWM control), set at its individual PWM controller
value or at both individual and group PWM controller values. The PCU9955 operates with
a supply voltage range of 3 V to 5.5 V and the constant current sink LEDn outputs allow
up to 40 V for the LED supply. The output current is adjustable with an 8-bit linear DAC
from 225 A to 57 mA.
This device has built-in open, short load and overtemperature detection circuitry. The
thermal shutdown feature protects the device when internal junction temperature exceeds
the limit allowed for the process.
The PCU9955 device is the first LED controller device in a new Ultra Fast-mode (UFm)
I2C-bus family. UFm I2C-bus devices offer higher frequency (up to 5 MHz). The UFm
I2C-bus slave devices operate in receive-only mode. That is, only I2C writes to PCU9955
are supported. As such, there are no status registers in PCU9955. The PCU9955 allows
significantly higher data transfer rate compared to the Fast-mode Plus versions
(PCA9952/55).
Software programmable LED Group and three Sub Call I2C-bus addresses allow all or
defined groups of PCU9955 devices to respond to a common I2C-bus address, allowing
for example, all red LEDs to be turned on or off at the same time, thus minimizing I2C-bus
commands. On power-up, PCU9955 will have a unique Sub Call address to identify it as a
16-channel LED driver. This allows mixing of devices with different channel widths. Four
hardware address pins on PCU9955 allow up to 16 devices on the same bus.
The Software Reset (SWRST) function allows the master to perform a reset of the
PCU9955 through the I2C-bus, identical to the Power-On Reset (POR) that initializes the
registers to their default state causing the output current switches to be OFF (LED off).
This allows an easy and quick way to reconfigure all device registers to the same
condition.


NXP Semiconductors Electronic Components Datasheet

PCU9955 Datasheet

16-channel UFm I2C-bus 57mA constant current LED driver

No Preview Available !

NXP Semiconductors
PCU9955
16-channel UFm I2C-bus 57 mA constant current LED driver
2. Features and benefits
16 LED drivers. Each output programmable at:
Off
On
Programmable LED brightness
Programmable group dimming/blinking mixed with individual LED brightness
Programmable LEDn output enable delay to reduce EMI and surge currents
16 constant current output channels can sink up to 57 mA, tolerate up to 40 V when
OFF
Output current adjusted through an external resistor
Output current accuracy
6 % between output channels
8 % between PCU9955 devices
Thermal shutdown for overtemperature
5 MHz Ultra Fast-mode compatible I2C-bus interface
256-step (8-bit) linear programmable brightness per LEDn output varying from fully off
(default) to maximum brightness using a 31.25 kHz PWM signal
256-step group brightness control allows general dimming (using a 122 Hz PWM
signal) from fully off to maximum brightness (default)
256-step group blinking programmable from 15 Hz to 16.8 s and duty cycle from 0 %
to 99.6 %
Output state change programmable on the Acknowledge (bit 9, this bit is always set
to 1 by I2C-bus master) or the STOP Command to update outputs byte-by-byte or all at
the same time (default to ‘Change on STOP’).
4 hardware address pins allow 16 PCU9955 devices to be connected to the same
I2C-bus and to be individually programmed
4 software programmable I2C-bus addresses (one LED Group Call address and three
LED Sub Call addresses) allow groups of devices to be addressed at the same time in
any combination (for example, one register used for ‘All Call’ so that all the PCU9955s
on the I2C-bus can be addressed at the same time and the second register used for
three different addresses so that 13 of all devices on the bus can be addressed at the
same time in a group). Software enable and disable for each programmable I2C-bus
address.
Unique power-up default Sub Call address allows mixing of devices with different
channel widths
Software Reset feature (SWRST Call) allows the device to be reset through the
I2C-bus
8 MHz internal oscillator requires no external components
Internal power-on reset
Noise filter on USDA/USCL inputs
No glitch on LEDn outputs on power-up
Low standby current
Operating power supply voltage (VDD) range of 3 V to 5.5 V
5.5 V tolerant inputs on non-LED pins
40 C to +85 C operation
PCU9955
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2.1 — 29 June 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
2 of 40


Part Number PCU9955
Description 16-channel UFm I2C-bus 57mA constant current LED driver
Maker NXP
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