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NXP Semiconductors
PCA9635
16-bit Fm+ I 2 C-bus LED driver
2. Features
I 16 LED drivers. Each output programmable at:
N Off
N On
N Programmable LED brightness
N Programmable group dimming/blinking mixed with individual LED brightness
I 1 MHz Fast-mode Plus compatible I 2 C-bus interface with 30 mA high drive capability
on SDA output for driving high capacitive buses
I 256-step (8-bit) linear programmable brightness per LED output varying from fully off
(default) to maximum brightness using a 97 kHz PWM signal
I 256-step group brightness control allows general dimming (using a 190 Hz PWM
signal) from fully off to maximum brightness (default)
I 256-step group blinking with frequency programmable from 24 Hz to 10.73 s and duty
cycle from 0 % to 99.6 %
I Sixteen totem-pole outputs (sink 25 mA and source 10 mA at 5 V) with software
programmable open-drain LED outputs selection (default at totem-pole). No input
function.
I 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’).
I Active LOW Output Enable (OE) input pin. LED outputs programmable to logic 1,
logic 0 or ‘high-impedance’ (default at power-up) when OE is HIGH, thus allowing
hardware blinking and dimming of the LEDs.
I 7 hardware address pins allow 126 devices to be connected to the same I 2 C-bus
I 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 PCA9635s
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 I 2 C-bus address.
I Software Reset feature (SWRST Call) allows the device to be reset through the
I 2 C-bus
I 25 MHz internal oscillator requires no external components
I Internal power-on reset
I Noise ?lter on SDA/SCL inputs
I Edge rate control on outputs
I No glitch on power-up
I Supports hot insertion
I Low standby current
I Operating power supply voltage range of 2.3 V to 5.5 V
I 5.5 V tolerant inputs
I ? 40 ° C to +85 ° C operation
I ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115 and 1000 V CDM per JESD22-C101
I Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
I Packages offered: TSSOP28
PCA9635_7
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 07 — 16 July 2009
2 of 35
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