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CAT9532 Datasheet(PDF) 1 Page - ON Semiconductor |
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CAT9532 Datasheet(HTML) 1 Page - ON Semiconductor |
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1 / 18 page  CAT9532 16-bit Programmable LED Dimmer with I 2C Interface FEATURES 16 LED drivers with dimming control 256 brightness steps 16 open drain outputs drive 25 mA each 2 selectable programmable blink rates: – frequency: 0.593Hz to 152Hz – duty cycle: 0% to 99.6% I/Os can be used as GPIOs 400kHz I 2C bus compatible* 2.3V to 5.5V operation 5V tolerant I/Os Active low reset input RoHS-compliant 24-Lead SOIC, TSSOP and 24-pad TQFN (4 x 4mm) packages APPLICATIONS Backlighting RGB color mixing Sensors control Power switches, push-buttons Alarm systems DESCRIPTION The CAT9532 is a CMOS device that provides 16-bit parallel input/output port expander optimized for LED dimming control. The CAT9532 outputs can drive directly 16 LEDs in parallel. Each individual LED may be turned ON, OFF, or blinking at one of two programmable rates. The device provides a simple solution for dimming LEDs in 256 brightness steps for backlight and color mixing applications. The CAT9532 is suitable in I 2C and SMBus compatible applications where it is necessary to limit the bus traffic or free-up the bus master’s timer. The CAT9532 contains an internal oscillator and two PWM signals that drive the LED outputs. The user can program the period and duty cycle for each individual PWM signal. After the initial set-up command to program the Blink Rate 1 and Blink Rate 2 (frequency and duty cycle), only one command from the bus master is required to turn each individual open drain output ON, OFF, or cycle at Blink Rate 1 or Blink Rate 2. Each open drain LED output can provide a maximum output current of 25mA. The total current sunk by all I/Os must not exceed 200mA. TYPICAL APPLICATION CIRCUIT For Ordering Information details, see page 17. CAT9532 GPIOs I2C/SMBus Master VSS A0 A1 A2 RS0 3 x 10k Ω RS1 RS11 5 V LED11 LED1 LED0 VCC LED12 LED15 SDA 5 V SCL SDA SCL RESET RESET Notes: LED0 to LED11 are used as LED drivers * Catalyst Semiconductor is licensed by Philips Corporation to carry the I 2C Protocol. LED12 to LED15 are used as regular GPIOs © 2010 SCILLC. All rights reserved 1 Doc. No. MD-9001 Rev. E Characteristics subject to change without notice |
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