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Part: PCA9531D
Category:
Optoelectronics
-> Drivers/Controllers
-> LEDs
Description: 8-bit I2C Led Dimmer<<<>>>the PCA9531 is an 8-bit i C 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 PCA9531 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 CAN Not 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 1.6 Second. The Open Drain Outputs Directly Drive The Leds With Maximum Output Sink Current of 25 ma Per Bit And 100 ma Per Package. <<<>>><<<>>>To Blink Leds at Periods Greater Than 1.6 Second The Bus Master (MCU, Mpu, DSP, Chipset, Etc.) Must Send Repeated Commands to Turn The Led on And Off as is Currently Done When Using Normal I/o Expanders Like The Philips PCF8574 or PCA9554. 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 Causing The Bits to be Set High (LED Off). <<<>>><<<>>>Three Hardware Address Pins on The PCA9531 Allow Eight Devices to Operate on The Same Bus. <<<>>><<<>>> <<<>>> Features Eight Led Drivers (on, Off, Flashing at a Programmable Rate) <<<>>>Two Selectable, Fully Programmable Blink Rates (frequency And Duty Cycle) Between 0.625 And 160 HZ (1.6 And 6.25 Milliseconds) <<<>>>256 Brightness Steps <<<>>>Input/outputs Not Used as Led Drivers CAN be Used as Regular Gpios <<<>>>Internal Oscillator Requires no External Components <<<>>>I C Interface Logic Compatible With Smbus <<<>>>Internal Power-on Reset <<<>>>Noise Filter on Scl/sda Inputs <<<>>>Active Low Reset Input <<<>>>Eight Open Drain Outputs Directly Drive Leds to 25 ma <<<>>>Edge Rate Control on Outputs <<<>>>No Glitch on Power-up <<<>>>Supports Hot Insertion <<<>>>Low Stand-by Current <<<>>>Operating Power Supply Voltage Range of 2.3 V to 5.5 V <<<>>>0 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 <<<>>>Package Offer: SO16, TSSOP16, HVQFN16
Company: Philips Semiconductors
Datasheet: Download PCA9531D datasheet File size : 110 kB
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Datasheet text preview:
INTEGRATED CIRCUITS
PCA9531 8-bit I2C LED dimmer
Product data 2003 Nov 10
Philips Semiconductors
Philips Semiconductors
Product data
8-bit I2C LED dimmer
PCA9531
DESCRIPTION
The PCA9531 is an 8-bit I2C & SMBus I/O expander optimized for dimming LEDs in 256 discrete steps for Red/Green/Blue (RGB) color mixing and back light applications. The PCA9531 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 can not 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 1.6 second. The open drain outputs directly drive the LEDs with maximum output sink current of 25 mA per bit and 100 mA per package. To blink LEDs at periods greater than 1.6 second the bus master (MCU, MPU, DSP, chipset, etc.) must send repeated commands to turn the LED on and off as is currently done when using normal I/O Expanders like the Philips PCF8574 or PCA9554. 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 causing the bits to be set high (LED off). Three hardware address pins on the PCA9531 allow eight devices to operate on the same bus.
FEATURES
· Eight LED drivers (on, off, flashing at a programmable rate) · Two selectable, fully programmable blink rates (frequency and
duty cycle) between 0.625 and 160 Hz (1.6 and 6.25 milliseconds)
· 256 brightness steps · Input/outputs not used as LED drivers can be used as regular
GPIOs
· Internal oscillator requires no external components · I2C interface logic compatible with SMBus · Internal power-on reset · Noise filter on SCL/SDA inputs · Active low reset input · Eight open drain outputs directly drive LEDs to 25 mA · Edge rate control on outputs · No glitch on power-up · Supports hot insertion · Low stand-by current · Operating power supply voltage range of 2.3 V to 5.5 V · 0 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
· Package offer: SO16, TSSOP16, HVQFN16
ORDERING INFORMATION
PACKAGES 16-pin plastic SO 16-pin plastic TSSOP TEMPERATURE RANGE -40 to +85 °C -40 to +85 °C ORDER CODE PCA9531D PCA9531PW TOPSIDE MARK PCA9531D PCA9531 DRAWING NUMBER SOT109-1 SOT403-1 SOT629-1
16-pin plastic HVQFN -40 to +85 °C PCA9531BS 9531 Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging. I2C is a trademark of Philips Semiconductors Corporation.
2003 Nov 10
2
Philips Semiconductors
Product data
8-bit I2C LED dimmer
PCA9531
PIN CONFIGURATION -- SO, TSSOP
A0 1 A1 2 A2 3 LED0 4 LED1 5 LED2 6 LED3 7 V SS 8 16 VDD 15 SDA 14 SCL 13 RESET 12 LED7 11 LED6 10 LED5 9 LED4
PIN CONFIGURATION -- HVQFN
A1 16 A0 15 VDD 14 SDA 13 12 SCL 11 RESET 10 LED7 9 5 6 7 8 LED6
A2 LED0 LED1 LED2
1 2 3 4
LED3 SW02039
VSS LED4 LED5
Figure 1. Pin configuration -- SO, TSSOP
TOP VIEW
su01667
Figure 2. Pin configuration -- HVQFN
PIN DESCRIPTION
SO, TSSOP PIN NUMBER 1 2 3 4, 5, 6, 7 8 9, 10, 11, 12 13 14 15 16 HVQFN PIN NUMBER 15 16 1 2, 3, 4, 5 6 7, 8, 9, 10 11 12 13 14 SYMBOL A0 A1 A2 LED0-3 VSS LED4-7 RESET SCL SDA VDD FUNCTION Address input 0 Address input 1 Address input 2 LED drivers 0-3 Supply ground LED drivers 4-7 Active low reset input Serial clock line Serial data line Supply voltage
2003 Nov 10
3
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