CAT9552 Datasheet | onsemi

.. 16-Channel I2C-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 25m A each - I/Os can be used as GPIOs - 400k Hz I2C bus patible - 2.3V to 5.5V operation - 5V tolerant I/Os - Active low reset input - Ro HS-pliant 24-Lead SOIC, TSSOP and 24-pad TQFN (4 x 4mm) packages 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 patible with I2C 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 mand to program the Blink Rate 1 and Blink Rate 2 (frequency and duty cycle), only one mand 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 25m A. The total continuous current sunk by all I/Os must not exceed 200m A per package. APPLICATIONS - Office machines - Appliance control panels - Alarm systems - Point of sale displays TYPICAL APPLICATION CIRCUIT 5V 5V For Ordering Information details, see page 17. 3 x 10kΩ SDA SCL RESET I2C/SMBus Master A2 A1 A0 VSS LED15 SDA SCL RESET VCC LED0 LED1 RS0 RS1 RS11 CAT9552 LED11 LED12 GPIOs Notes: LED0 to LED11 are shown being used as LED drivers LED12 to LED15 are used as standard GPIOs © 2010 SCILLC. All rights reserved Characteristics subject to change without...