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PCA9532: 16-bit I2C-bus LED dimmer

The PCA9532 is a 16-bit I²C-bus and SMBus I/O expander optimized for dimming LEDs in 256 discrete steps for Red/Green/Blue (RGB) color mixing and back light applications.

The PCA9532 contains an internal oscillator with two user programmable blink rates and duty cycles coupled to the output PWM. The LED brightness is controlled by setting the blink rate high enough (> 100 Hz) that the blinking cannot be seen and then using the duty cycle to vary the amount of time the LED is on and thus the average current through the LED.

The initial setup sequence programs the two blink rates/duty cycles for each individual PWM. From then on, only one command from the bus master is required to turn individual LEDs ON, OFF, BLINK RATE 1 or BLINK RATE 2. Based on the programmed frequency and duty cycle, BLINK RATE 1 and BLINK RATE 2 will cause the LEDs to appear at a different brightness or blink at periods up to 1.69 second. The open-drain outputs directly drive the LEDs with maximum output sink current of 25 mA per bit and 200 mA per package (100 mA per octal).

To blink LEDs at periods greater than 1.69 second the bus master (MCU, MPU, DSP, chip set, etc.) must send repeated commands to turn the LED on and off as is currently done when using normal I/O expanders like the NXP Semiconductors PCF8575 or PCA9555. Any bits not used for controlling the LEDs can be used for General Purpose parallel Input/Output (GPIO) expansion, which provides a simple solution when additional I/O is needed for ACPI power switches, sensors, push-buttons, alarm monitoring, fans, etc.

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 PCA9532 allow eight devices to operate on the same bus.

Outline 3d SOT137-1

Data Sheets (1)

Application Notes (3)

Users Guides (5)

Brochures (4)

Package Information (3)

Packing (3)

Reports or Presentations (1)

Supporting Information (2)

IBIS Model

• PCA9532 IBIS model (REV 1.0) ZIP PCA9532_1 8/26/2014

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
PCA9532BS		SOT616-1		Reel 13" Q1/T1	Active	PCA9532BS,118 (9352 728 39118)	9532	PCA9532BS		Always Pb-free	0.0	2.0	5E8	1	1
PCA9532D		SOT137-1	SO-SOJ-WAVE	Reel 13" Q1/T1	Active	PCA9532D,118 (9352 728 38118)	PCA9532D	PCA9532D		week 5, 2005	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9532D,112 (9352 728 38112)	PCA9532D	PCA9532D		week 5, 2005	0.0	2.0	5E8	1	1
PCA9532PW		SOT355-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	PCA9532PW,118 (9352 728 37118)	PCA9532PW	PCA9532PW		week 12, 2005	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9532PW,112 (9352 728 37112)	PCA9532PW	PCA9532PW		week 12, 2005	0.0	2.0	5E8	1	1
PCA9532PW/S908		SOT355-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	PCA9532PW/S908,118 (9352 895 87118)	PCA9532PW	PCA9532PW/S908		Always Pb-free	0.0	2.0	5E8	1	1