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CAT9532
16-bit Programmable LED Dimmer with I
2
C Interface
FEATURES
16 LED drivers with dimming control
256 brightness steps
16 open drain outputs drive 25 mA each
2 selectable programmable blink rates:
– frequency: 0.593Hz to 152Hz
– duty cycle: 0% to 99.6%
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 CAT9532 is a CMOS device that provides 16-bit
parallel input/output port expander optimized for LED
dimming control. The CAT9532 outputs can drive
directly 16 LEDs in parallel. Each individual LED may
be turned ON, OFF, or blinking at one of two
programmable rates. The device provides a simple
solution for dimming LEDs in 256 brightness steps for
backlight and color mixing applications. The CAT9532
2
is suitable in I C and SMBus compatible applications
where it is necessary to limit the bus traffic or free-up
the bus master’s timer.
The CAT9532 contains an internal oscillator and two
PWM signals that drive the LED outputs. The user can
program the period and duty cycle for each individual
PWM signal. After the 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 provide a maximum output
current of 25mA. The total current sunk by all I/Os must
not exceed 200mA.
APPLICATIONS
Backlighting
RGB color mixing
Sensors control
Power switches, push-buttons
Alarm systems
TYPICAL APPLICATION CIRCUIT
For Ordering Information details, see page 16.
5V
5V
3 x 10kΩ
SDA
SCL
RESET
I
2
C/SMBus
Master
A2
A1
A0
V
SS
SDA
SCL
RESET
V
CC
RS0
RS1
RS11
LED0
LED1
CAT9532
LED11
LED12
GPIOs
LED15
* Catalyst Semiconductor is licensed by Philips Corporation to
2
carry the I C Protocol.
1
Notes:
LED0 to LED11 are used as LED drivers
LED12 to LED15 are used as regular GPIOs
Doc. No. MD-9001 Rev. C
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT9532
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
LED5 6
LED0 1
LED1 2
LED2 3
LED3 4
LED4 5
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
DIP / 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
PIN NAME
AO
A1
A2
LED0 - LED7
V
SS
LED8 - LED15
¯¯¯¯¯¯
RESET
SCL
SDA
V
CC
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
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
CAT9532
Doc. No. MD-9001 Rev. C
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT9532
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-9001 Rev. C
CAT9532
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-9001 Rev. C
4
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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