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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-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 I 2 C-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 I 2 C-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
I 2 C-bus and to be individually programmed
? 4 software programmable I 2 C-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 I 2 C-bus can be addressed at the same time and the second register used for
three different addresses so that 1 ? 3 of all devices on the bus can be addressed at the
same time in a group). Software enable and disable for each programmable I 2 C-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
I 2 C-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 (V DD ) 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 — 2 October 2012
? NXP B.V. 2012. All rights reserved.
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