© Semiconductor Components Industries, LLC, 2011
December, 2011 ï Rev. 0
1 Publication Order Number:
CAT9552/D
CAT9552
16-Channel I
2
C-bus LED
Driver with Programmable
Blink Rate
Description
The CAT9552 is a 16ïchannel, 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
2
C and SMBus applications
where it is desireable to limit the bus traffic or freeïup 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 setïup
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 25 mA. The total continuous current sunk by all
I/Os must not exceed 200 mA per package.
Features
• 16 LED Drivers with On/Off and Programmable Blink Rate Control
• 2 Selectable, Programmable Blink Rates:
– Frequency: 0.172 Hz to 44 Hz
– Duty Cycle: 0% to 99.6%
• 16 Open Drain Outputs Drive 25 mA Each
• I/Os can be Used as GPIOs
• 400 kHz I
2
C Bus Compatible
• 2.3 V to 5.5 V Operation
• 5 V Tolerant I/Os
• Active Low Reset Input
• 24ïLead SOIC, TSSOP and 24ïpad TQFN (4 x 4 mm) Packages
• These Devices are PbïFree, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• Office Machines
• Appliance Control Panels
• Alarm Systems
• Point of Sale Displays
http://onsemi.com
SOICï24
W SUFFIX
CASE 751BK
TSSOPï24
Y SUFFIX
CASE 948AR
TQFNï24
HV6 SUFFIX
CASE 510AG
TQFNï24
HT6 SUFFIX
CASE 510AN
See detailed ordering and shipping information in the package
dimensions section on page 16 of this data sheet.
ORDERING INFORMATION
