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PCU9656 Datasheet

24-bit UFm 5MHz I2C-bus 100mA 40V LED driver

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PCU9656
24-bit UFm 5 MHz I2C-bus 100 mA 40 V LED driver
Rev. 1 — 8 December 2011
Product data sheet
1. General description
The PCU9656 is a UFm I2C-bus controlled 24-bit LED driver optimized for voltage switch
dimming and blinking 100 mA Red/Green/Blue/Amber (RGBA) LEDs. Each LEDn output
has its own 8-bit resolution (256 steps) fixed frequency individual PWM controller that
operates at 97 kHz (typical) 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 frequency of 190 Hz and an adjustable frequency
between 24 Hz to once every 10.73 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 PCU9656 operates with
a supply voltage range of 2.3 V to 5.5 V and the 100 mA open-drain outputs allow
voltages up to 40 V for the LED supply.
The PCU9656 is one of the first LED controller devices in a new Ultra Fast-mode (UFm)
family. UFm devices offer higher frequency (up to 5 MHz).
The active LOW Output Enable input pin (OE) blinks all the LEDn outputs and can be
used to externally PWM the outputs, which is useful when multiple devices need to be
dimmed or blinked together without using software control.
Software programmable LED Group and three Sub Call I2C-bus addresses allow all or
defined groups of PCU9656 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 or marquee chasing
effect, thus minimizing I2C-bus commands. Six hardware address pins allow up to
64 devices on the same bus.
The Software Reset (SWRST) Call allows the master to perform a reset of the PCU9656
through the I2C-bus, identical to the Power-On Reset (POR) that initializes the registers to
their default state causing the output NAND FETs to be OFF (LED off). This allows an
easy and quick way to reconfigure all device registers to the same condition.
A new feature to control LEDn output pattern is incorporated in the PCU9656. A new
control byte called ‘Chase Byte’ allows enabling or disabling of selective LEDn outputs
depending on the value of the Chase Byte. This feature greatly reduces the number of
bytes to be sent to the PCU9656 when repetitive patterns need to be displayed as in
creating a marquee chasing effect.


NXP Semiconductors Electronic Components Datasheet

PCU9656 Datasheet

24-bit UFm 5MHz I2C-bus 100mA 40V LED driver

No Preview Available !

NXP Semiconductors
PCU9656
24-bit UFm 5 MHz I2C-bus 100 mA 40 V LED driver
2. Features and benefits
24 LED drivers. Each output programmable at:
Off
On
Programmable LED brightness
Programmable group dimming/blinking mixed with individual LED brightness
5 MHz Ultra Fast-mode unidirectional I2C-bus interface
256-step (8-bit) linear programmable brightness per LEDn output varying from fully off
(default) to maximum brightness using a 97 kHz PWM signal
256-step group brightness control allows general dimming (using a 190 Hz PWM
signal) from fully off to maximum brightness (default)
256-step group blinking with frequency programmable from 24 Hz to 10.73 s and
duty cycle from 0 % to 99.6 %
24 open-drain outputs can sink between 0 mA to 100 mA and are tolerant to a
maximum off state voltage of 40 V. No input function.
Output state change programmable on the Acknowledge (bit 9, this bit is always set
to 1 by master) or the STOP Command to update outputs byte-by-byte or all at the
same time (default to ‘Change on STOP’).
Active LOW Output Enable (OE) input pin allows for hardware blinking and dimming of
the LEDs
Six hardware address pins allow 64 PCU9656 devices to be connected to the same
UFm I2C-bus and to be individually programmed
Four software programmable UFm 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 PCU9656s 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 I2C-bus
address.
A Chase Byte allows execution of predefined ON/OFF pattern for the 24 LEDn outputs
Software Reset feature (SWRST Call) allows the device to be reset through the
UFm I2C-bus
25 MHz internal oscillator requires no external components
Internal power-on reset
Noise filter on USDA/USCL inputs
Glitch-free LEDn outputs on power-up
Supports hot insertion
Low standby current
Operating power supply voltage (VDD) range of 2.3 V to 5.5 V
5.5 V tolerant inputs on non-LED pins
40 C to +85 C operation
ESD protection exceeds 2000 V HBM per JESD22-A114, and 1000 V CDM per
JESD22-C101
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
Package offered: LQFP48
PCU9656
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 8 December 2011
© NXP B.V. 2011. All rights reserved.
2 of 45


Part Number PCU9656
Description 24-bit UFm 5MHz I2C-bus 100mA 40V LED driver
Maker NXP
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PCU9656 Datasheet PDF






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