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PCA9634: 8-bit Fm+ I2C-bus LED driver

The PCA9634 is an I²C-bus controlled 8-bit LED driver optimized for Red/Green/Blue/Amber (RGBA) color mixing applications. Each LED output has its own 8-bit resolution (256 steps) fixed frequency Individual PWM controller that operates at 97 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 190 Hz and an adjustable frequency between 24 Hz to once every 10.73 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 LED 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 LED output driver is programmed to be either open-drain with a 25 mA current sink capability at 5 V or totem-pole with a 25 mA sink, 10 mA source capability at 5 V. The PCA9634 operates with a supply voltage range of 2.3 V to 5.5 V and the outputs are 5.5 V tolerant. LEDs can be directly connected to the LED output (up to 25 mA, 5.5 V) or controlled with external drivers and a minimum amount of discrete components for larger current or higher voltage LEDs.

The PCA9634 is one of the first LED controller devices in a new Fast-mode Plus (Fm+) family. Fm+ devices offer higher frequency (up to 1 MHz) and more densely populated bus operation (up to 4000 pF).

The active LOW Output Enable input pin (OE) allows asynchronous control of the LED outputs and can be used to set all the outputs to a defined I²C-bus programmable logic state. The OE can also be used to externally PWM the outputs, which is useful when multiple devices need to be dimmed or blinked together using software control.

Software programmable LED Group and three Sub Call I²C-bus addresses allow all or defined groups of PCA9634 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. Seven hardware address pins allow up to 126 devices on the same bus.

The Software Reset (SWRST) Call allows the master to perform a reset of the PCA9634 through the I²C-bus, identical to the Power-On Reset (POR) that initializes the registers to their default state causing the outputs to be set HIGH (LED off). This allows an easy and quick way to reconfigure all device registers to the same condition.

PCA9634: Product Block Diagram

SOT163-1

Data Sheets (1)

Application Notes (1)

Users Guides (5)

Brochures (3)

Package Information (3)

Packing (3)

Supporting Information (3)

IBIS Model

• PCA9634 IBIS model (REV 1.0) ZIP PCA9634_1 9/4/2014

Ordering Information

Package Information

Product ID	Package Description	Outline Version	Reflow/Wave Soldering	Packing	Product Status	Part NumberOrdering code(12NC)	Marking	Chemical Content	RoHS / Pb Free / RHF	LeadFree Conversion Date	EFR	IFR(FIT)	MTBF(hour)	MSL	MSL LF
PCA9634PW		SOT360-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	PCA9634PW,118 (9352 822 33118)	PCA9634	PCA9634PW		Always Pb-free	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9634PW,112 (9352 822 33112)	PCA9634	PCA9634PW		Always Pb-free	0.0	2.0	5E8	1	1
PCA9634BS		SOT662-1		Reel 13" Q1/T1	Active	PCA9634BS,118 (9352 822 34118)	9634	PCA9634BS		Always Pb-free	0.0	2.0	5E8	1	1
PCA9634D		SOT163-1	Reflow_Soldering_Profile Wave_Soldering_Profile Reflow_Soldering_Profile Wave_Soldering_Profile	Reel 13" Q1/T1	Active	PCA9634D,118 (9352 822 32118)	PCA9634D	PCA9634D		Always Pb-free	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9634D,112 (9352 822 32112)	PCA9634D	PCA9634D		Always Pb-free	0.0	2.0	5E8	1	1