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PCA9551: 8-bit I2C-bus LED driver with programmable blink rates

The PCA9551 LED blinker blinks LEDs in I²C-bus and SMBus applications where it is necessary to limit bus traffic or free up the I²C-bus master's (MCU, MPU, DSP, chip set, etc.) timer. The uniqueness of this device is the internal oscillator with two programmable blink rates. To blink LEDs using normal I/O expanders like the PCF8574 or PCA9554, the bus master must send repeated commands to turn the LED on and off. This greatly increases the amount of traffic on the I²C-bus and uses up one of the master's timers. The PCA9551 LED blinker instead requires only the initial set-up command to program BLINK RATE 1 and BLINK RATE 2 (i.e., the frequency and duty cycle) for each individual output. From then on, only one command from the bus master is required to turn each individual open-drain output on, off, or to cycle at BLINK RATE 1 or BLINK RATE 2. Maximum output sink current is 25 mA per bit and 100 mA per package.

Any bits not used for controlling the LEDs can be used for General Purpose parallel Input/Output (GPIO) expansion.

The active LOW hardware reset pin (RESET) and Power-On Reset (POR) initializes the registers to their default state, all zeroes, causing the bits to be set HIGH (LED off).

Three hardware address pins on the PCA9551 allow eight devices to operate on the same bus.

The newer Fast-mode Plus PCA9634 8-bit LED controller offers an individual PWM dimming control for each channel for better color mixing capabilities with a global PWM for dimming or blinking all channels at the same time. There are 126 possible address combinations and the maximum output sink current is 25 mA per bit and 200 mA per package.

PCA9551: Product Block Diagram

sot629-1_3d

Data Sheets (1)

Application Notes (4)

Users Guides (4)

Brochures (6)

Package Information (3)

Packing (4)

Reports or Presentations (1)

Supporting Information (3)

IBIS Model

• PCA9551 IBIS model (REV 1.0) ibs PCA9551_1 9/2/2014

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
PCA9551D		SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1	Active	PCA9551D,118 (9352 716 95118)	PCA9551D	PCA9551D		week 6, 2004	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9551D,112 (9352 716 95112)	PCA9551D	PCA9551D		week 6, 2004	0.0	2.0	5E8	1	1
PCA9551PW		SOT403-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	PCA9551PW,118 (9352 716 92118)	PCA9551	PCA9551PW		week 48, 2004	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9551PW,112 (9352 716 92112)	PCA9551	PCA9551PW		week 48, 2004	0.0	2.0	5E8	1	1
PCA9551BS		SOT629-1		Reel 13" Q2/T3	Active	PCA9551BSHP (9352 722 40128)	9551	PCA9551BS		Always Pb-free	0.0	2.0	5E8	1	1
				Reel 13" Q1/T1	Active	PCA9551BS,118 (9352 722 40118)	9551	PCA9551BS		Always Pb-free	0.0	2.0	5E8	1	1