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CAT9552 Datasheet(PDF) 1 Page - ON Semiconductor |
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CAT9552 Datasheet(HTML) 1 Page - ON Semiconductor |
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1 / 18 page  CAT9552 16-Channel I 2C-bus LED Driver with Programmable Blink Rate FEATURES 16 LED drivers with On/Off and programmable blink rate control 2 selectable, programmable blink rates: – frequency: 0.172Hz to 44Hz – duty cycle: 0% to 99.6% 16 open drain outputs drive 25mA each 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 Office machines Appliance control panels Alarm systems Point of sale displays DESCRIPTION The CAT9552 is a 16-channel, parallel input/output port expander optimized for LED On/Off and blinking control. Each individual LED may be turned ON, OFF, or set to blinking at one of two programmable rates. The CAT9552 is compatible with I 2C and SMBus applications where it is desireable to limit the bus traffic or free-up the bus master’s internal timer. Three address pins allow up to eight CAT9552 devices to occupy the same bus. The CAT9552 contains an internal oscillator and two PWM signals, which drive the LED outputs. The user may program the period and duty cycle for each individual PWM signal. After an 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 sink a maximum current of 25mA. The total continuous current sunk by all I/Os must not exceed 200mA per package. TYPICAL APPLICATION CIRCUIT CAT9552 GPIOs I2C/SMBus Master VSS A0 A1 A2 RS0 3 x 10kΩ RS1 RS11 5 V LED11 LED1 LED0 VCC LED12 LED15 SDA 5 V SCL SDA SCL RESET RESET For Ordering Information details, see page 17. Notes: LED0 to LED11 are shown being used as LED drivers LED12 to LED15 are used as standard GPIOs © 2010 SCILLC. All rights reserved 1 Doc. No. MD-9005 Rev D Characteristics subject to change without notice |
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