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PCA9530D Datasheet(PDF) 2 Page - NXP Semiconductors |
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PCA9530D Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 16 page Philips Semiconductors Preliminary data PCA9530 2-bit I2C LED dimmer 2 2002 Dec 12 FEATURES • 2 LED drivers (on, off, flashing at a programmable rate) • 2 selectable, fully programmable blink rates (frequency and duty cycle) between 0.625 and 160 Hz (1.6 seconds and 6.25 milliseconds) • 256 brightness steps • Input/output 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 • 2 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 JESDEC Standard JESD78 which exceeds 100 mA • Package offer: SO8, TSSOP8, VSSOP8 DESCRIPTION The PCA9530 is a 2-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 PCA9530 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 50 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, pushbuttons, alarm monitoring, fans, etc. The active low hardware reset pin (RESET) and Power On Reset (POR) initialize the registers to their default state causing the bits to be set high (LED off). One hardware address pin on the PCA9530 allows two devices to operate on the same bus. 1 2 3 45 6 7 8 A0 LED0 LED1 VSS VDD SDA SCL RESET SW00926 Figure 1. Pin configuration PIN DESCRIPTION PIN NUMBER SYMBOL FUNCTION 1 A0 Address input 0 2 LED0 LED driver 0 3 LED1 LED driver 1 4 VSS Supply ground 5 RESET Active low reset input 6 SCL Serial clock line 7 SDA Serial data line 8 VDD Supply voltage ORDERING INFORMATION PACKAGES TEMPERATURE RANGE ORDER CODE TOPSIDE MARK DRAWING NUMBER 8-Pin Plastic SO -40 to +85 °C PCA9530D PCA9530 SOT96-1 8-Pin Plastic TSSOP -40 to +85 °C PCA9530DP 9530 SOT505-1 Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging. I2C is a trademark of Philips Semiconductors Corporation. |
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