NXP PCA9952TW/Q900,118

Линейный3V5.5V57 мА

Overview

The PCA9952 and PCA9955 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 % 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 122 Hz and an adjustable frequency between Hz to once every 16.8 seconds with a duty cycle that is adjustable from 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 and PCA9955 operate with a supply voltage range 5.5 V and the constant current sink LEDn outputs allow 40 V for the LED supply. The output peak current is adjustable with an 8-bit linear DAC from 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 and PCA9955 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 is identical to PCA9955 except for the following differences:

Amusement products RGB or RGBA LED drivers LED status information LED displays LCD backlights Keypad backlights for cellular phones or handheld devices Automotive lighting (PCA9952TW/Q900, PCA9955TW/Q900)

Features