PCA9532 2 16-bit I C-bus LED dimmer Rev. 4.1 22 August 2016 Product data sheet 1. General description 2 The PCA9532 is a 16-bit I C-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. 2. Features and benefits 16 LED drivers (on, off, flashing at a programmable rate) Two selectable, fully programmable blink rates (frequency and duty cycle) between 0.591 Hz and 152 Hz (1.69 second and 6.58 milliseconds) 256 brightness steps Input/outputs not used as LED drivers can be used as regular GPIOs Internal oscillator requires no external components 2 I C-bus interface logic compatible with SMBus Internal power-on resetPCA9532 NXP Semiconductors 2 16-bit I C-bus LED dimmer Noise filter on SCL/SDA inputs Active LOW reset input 16 open-drain outputs directly drive LEDs to 25 mA Controlled edge rates to minimize ground bounce No glitch on power-up Supports hot insertion Low standby current Operating power supply voltage range of 2.3 V to 5.5 V 0 Hz to 400 kHz clock frequency ESD protection exceeds 2000 V HBM per JESD22-A114, 150 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101 Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA Packages offered: SO24, TSSOP24, HVQFN24 3. Ordering information Table 1. Ordering information T = 40 Cto+85 C. amb Type number Topside Package mark Name Description Version PCA9532D PCA9532D SO24 plastic small outline package 24 leads body width 7.5 mm SOT137-1 PCA9532PW PCA9532PW TSSOP24 plastic thin shrink small outline package 24 leads SOT355-1 body width 4.4 mm PCA9532BS 9532 HVQFN24 plastic thermal enhanced very thin quad flat package no leads SOT616-1 24 terminals body 4 4 0.85 mm 4. Block diagram A0 A1 A2 PCA9532 INPUT REGISTER SCL 2 INPUT I C-BUS LED SELECT (LSn) FILTERS CONTROL REGISTER SDA 0 1 V LEDn DD POWER-ON RESET BLINK0 RESET PRESCALER 0 PWM0 REGISTER REGISTER BLINK1 PRESCALER 1 PWM1 OSCILLATOR REGISTER REGISTER V SS 002aae521 Only one I/O shown for clarity. Fig 1. Block diagram of PCA9532 PCA9532 All information provided in this document is subject to legal disclaimers. NXP Semiconductors N.V. 2016. All rights reserved. Product data sheet Rev. 4.1 22 August 2016 2 of 31