CAT9552

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 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. CAT9552 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.