CAT9552WI Datasheet, PDF (6/17 Pages) ON Semiconductor – 16-Channel I2C-bus LED Driver with Programmable Blink Rate

CAT9552
AC TEST CONDITIONS
Input Pulse Voltage
Input Rise and Fall Times
Input Reference Voltage
Output Reference Voltage
Output Load
0.2V_CC to 0.8V_CC
≤5ns
0.3V_CC, 0.7V_CC
0.5V_CC
Current source: I_OL = 3mA; 400pF for f_SCL(max) = 400kHz
tF
tHIGH
tR
tLOW
tLOW
SCL
tSU:STA
tHD:DAT
tHD:STA
tSU:DAT
SDA IN
SDA OUT
tAA
tDH
Figure 1. 2-Wire Serial Interface Timing
tSU:STO
tBUF
PIN DESCRIPTION
SCL: Serial Clock
The serial clock input clocks all data transferred into
or out of the device. The SCL line requires a pull-up
resistor if it is driven by an open drain output.
SDA: Serial Data/Address
The bidirectional serial data/address pin is used to
transfer all data into and out of the device. The SDA
pin is an open drain output and can be wire-ORed
with other open drain or open collector outputs. A pull-
up resistor must be connected from SDA line to V_CC.
LED0 to LED15: LED Driver Outputs / General
Purpose I/Os
These pins are open drain outputs used to directly
drive LEDs. Any of these pins can be programmed to
drive the LED ON, OFF, or to Blink Rate1 or Blink
Rate2. A current limiting resistor should be placed in
series with each LED to control the maximum LED
current. When not used for controlling the LEDs, these
pins may be used as general purpose parallel
input/output.
R¯¯E¯S¯E¯T¯: External Reset Input
Active low Reset input is used to initialize the
CAT9552 internal registers and the I²C state machine.
The internal registers are held in their default state
while Reset input is active. An external pull-up resistor
of maximum 25kΩ is required when this pin is not
actively driven.
Doc. No. MD-9005 Rev B
6
© 2008 SCILLC. All rights reserved
Characteristics subject to change without notice