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PCA9952Q900 fiches techniques PDF

NXP Semiconductors - 16-channel constant current LED driver

Numéro de référence PCA9952Q900
Description 16-channel constant current LED driver
Fabricant NXP Semiconductors 
Logo NXP Semiconductors 





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PCA9952Q900 fiche technique
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

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