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PCA9955-Q900 Datasheet

16-channel constant current LED driver

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PCA9952/Q900; PCA9955/Q900
16-channel Fm+ I2C-bus 57 mA constant current LED driver,
AEC-Q100 compliant
Rev. 1 — 26 April 2013
Product data sheet
1. General description
The PCA9952/Q900 and PCA9955/Q900 are 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 PCA9952/Q900 and
PCA9955/Q900 operate 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 peak current is
adjustable with an 8-bit linear DAC from 225 A to 57 mA.
These devices have built-in open, short load and overtemperature detection circuitry. The
error information from the corresponding register can be read via the I2C-bus. Additionally,
a thermal shutdown feature protects the device when internal junction temperature
exceeds the limit allowed for the process.
The PCA9952/Q900 and PCA9955/Q900 devices have Fast-mode Plus (Fm+) I2C-bus
interface. Fm+ devices offer higher frequency (up to 1 MHz) or more densely populated
bus operation (up to 4000 pF).
The PCA9952/Q900 is identical to PCA9955/Q900 except for the following differences:
The PCA9952/Q900 has only three hardware address pins compared to four on
PCA9955/Q900.
The PCA9952/Q900 has an output enable pin (OE) and the PCA9955/Q900 does not.
The active LOW output enable input pin (OE), available only on PCA9952/Q900, 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 PCA9952/Q900, PCA9955/Q900 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. On power-up,
PCA9952/Q900, PCA9955/Q900 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


NXP Semiconductors Electronic Components Datasheet

PCA9955-Q900 Datasheet

16-channel constant current LED driver

No Preview Available !

NXP Semiconductors
PCA9952/Q900; PCA9955/Q900
16-channel Fm+ I2C-bus 57 mA constant current LED driver, AEC-Q100
hardware address pins on PCA9955/Q900 allow up to 16 devices on the same bus. In the
case of PCA9952/Q900, three hardware address pins allow up to 8 devices on the same
bus.
The Software Reset (SWRST) function allows the master to perform a reset of the
PCA9952/Q900, PCA9955/Q900 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.
2. Features and benefits
Compliant with AEC-Q100
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 PCA9952/Q900, PCA9955/Q900 devices
Open/short load/overtemperature detection mode to detect individual LED errors
1 MHz Fast-mode Plus compatible I2C-bus interface with 30 mA high drive capability
on SDA output for driving high capacitive buses
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 with frequency programmable from 15 Hz to 16.8 s and duty
cycle from 0 % to 99.6 %
Output state change programmable on the Acknowledge 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 (only on PCA9952/Q900) allows for
hardware blinking and dimming of the LEDs
Four hardware address pins allow 16 PCA9955/Q900 devices to be connected to the
same I2C-bus and to be individually programmed
Four 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
PCA9952/Q900, PCA9955/Q900s 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.
PCA9952Q900_PCA9955Q900
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 26 April 2013
© NXP B.V. 2013. All rights reserved.
2 of 45


Part Number PCA9955-Q900
Description 16-channel constant current LED driver
Maker NXP
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