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CAT9552
16-Channel I
2
C-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
2
C 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
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
2
C 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.
APPLICATIONS
Office machines
Appliance control panels
Alarm systems
Point of sale displays
TYPICAL APPLICATION CIRCUIT
5V
5V
For Ordering Information details, see page 16.
3 x 10kΩ
SDA
SCL
RESET
I
2
C/SMBus
Master
A2
A1
A0
V
SS
LED15
SDA
SCL
RESET
V
CC
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
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-9005 Rev A
CAT9552
PIN CONFIGURATION
SOIC (W), TSSOP (Y)
24 A2
23 A1
TQFN (HV6)
20 SDA
19 SCL
21 V
CC
22 A0
AO
A1
A2
LED0
LED1
LED2
LED3
LED4
LED5
LED6
LED7
V
SS
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
19
17
16
15
14
13
V
CC
SDA
SCL
RESET
LED15
LED14
LED13
LED12
LED11
LED10
LED9
LED8
LED0 1
LED1 2
LED2 3
LED3 4
LED4 5
LED5 6
18 RESET
17 LED15
16 LED14
15 LED13
14 LED12
13 LED11
LED8 10
LED10 12
LED9 11
LED6 7
LED7 8
V
SS
9
PIN DESCRIPTION
SOIC / TSSOP
1
2
3
4-11
12
13-20
21
22
23
24
—
TQFN
22
23
24
1-8
9
10-17
18
19
20
21
Pad
PIN NAME
AO
A1
A2
LED0 - LED7
V
SS
LED8 - LED15
¯¯¯¯¯¯
RESET
SCL
SDA
V
CC
Backside pad
FUNCTION
Address Input 0
Address Input 1
Address Input 2
LED Driver Output 0 to 7, I/O Port 0 to 7
Ground
LED Driver Output 8 to 15, I/O Port 8 to 15
Reset Input
Serial Clock
Serial Data
Power Supply
For enhanced heat dissipation. Electrically this pad
must be at ground potential.
BLOCK DIAGRAM
A2
A1
A0
V
CC
RESET
SCL
SDA
POWER ON
RESET
I
2
C BUS
CONTROL
INPUT
REGISTER
LED SELECT (LSx)
REGISTER
INPUT
FILTERS
LEDx
PRESCALER 0
REGISTER
OSCILLATOR
V
SS
PRESCALER 1
REGISTER
PWM 1
REGISTER
BLINK 1
PWM 0
REGISTER
BLINK 0
CONTROL
LOGIC
Note:
Only one I/O is shown for clarity
CAT9552
Doc. No. MD-9005 Rev A
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT9552
ABSOLUTE MAXIMUM RATINGS
(1)
Parameters
V
CC
with Respect to Ground
Voltage on Any Pin with Respect to Ground
DC Current on I/Os
Supply Current
Package Power Dissipation Capability (T
A
= 25ºC)
Junction Temperature
Storage Temperature
Lead Soldering Temperature (10 seconds)
Operating Ambient Temperature
Ratings
-2.0 to +7.0
-0.5 to +5.5
±25
200
1.0
+150
-65 to +150
300
-40 to +85
Units
V
V
mA
mA
W
°C
ºC
ºC
ºC
Notes:
(1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this
specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. MD-9005 Rev. A
CAT9552
D.C. OPERATING CHARACTERISTICS
V
CC
= 2.3 to 5.5V, V
SS
= 0V; T
A
= -40ºC to +85ºC, unless otherwise specified
Symbol
Supplies
V
CC
I
CC
I
stb
Δ
I
stb
V
POR
(1)
Parameter
Supply Voltage
Supply Current
Standby Current
Additional Standby Current
Power-on Reset Voltage
Conditions
Min
2.3
Typ
—
250
2.1
—
1.5
Max
5.5
550
5.0
2
2.2
Unit
V
µA
µA
mA
V
Operating mode; V
CC
= 5.5V; no
load; f
SCL
= 100kHz
Standby mode; V
CC
= 5.5V; no load;
V
I
= V
SS
or V
CC
, f
SCL
= 0kHz
Standby mode; V
CC
= 5.5V; every
LED I/O = V
IN
= 4.3V, f
SCL
= 0kHz
V
CC
= 3.3V, No load;
V
I
= V
CC
or V
SS
—
—
—
—
¯¯¯¯¯¯
SCL, SDA, RESET
V
IL
(2)
(2)
Low Level Input Voltage
High Level Input Voltage
Low Level Output Current
Leakage Current
Input Capacitance
Output Capacitance
Low Level Input Voltage
High Level Input Voltage
Input Leakage Current
Low Level Input Voltage
High Level Input Voltage
V
OL
= 0.4V; V
CC
= 2.3V
V
OL
= 0.4V; V
CC
= 3.0V
V
OL
= 0.4V; V
CC
= 5.0V
V
OL
= 0.7V; V
CC
= 2.3V
V
OL
= 0.7V; V
CC
= 3.0V
V
OL
= 0.7V; V
CC
= 5.0V
V
OL
= 0.4V
V
I
= V
CC
= V
SS
V
I
= V
SS
V
O
= V
SS
-0.5
0.7 V
CC
3
-1
—
—
-0.5
2.0
-1
-0.5
2.0
9
12
15
15
20
25
-1
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.3 V
CC
5.5
—
+1
6
8
0.8
5.5
1
0.8
5.5
—
—
—
—
—
—
1
8
V
V
mA
µA
pF
pF
V
V
µA
V
V
V
IH
I
OL
I
IL
C
I
(3)
(3)
C
O
V
IL
A0, A1, A2
(2)
(2)
V
IH
I/Os
V
IL
I
IL
(2)
(2)
V
IH
I
OL
(4)
Low Level Output Current
mA
I
IL
(3)
C
I/O
Input Leakage Current
Input/Output Capacitance
V
CC
= 3.6V; V
I
= V
SS
or V
CC
µA
pF
Notes:
(1) V
DD
must be lowered to 0.2V in order to reset the device.
(2) V
IL
min and V
IH
max are reference values only and are not tested.
(3) This parameter is characterized initially and after a design or process change that affects the parameter. Not 100% tested.
(4) The output current must be limited to a maximum 25mA per each I/O; the total current sunk by all I/O must be limited to 200mA (or 100mA
for eight I/Os)
Doc. No. MD-9005 Rev A
4
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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