CAT9532 ONSEMI [ON Semiconductor], CAT9532 Datasheet - Page 12

• Manufacturer Part Number: CAT9532
• Description: 16-bit Programmable LED Dimmer with I2C Interface
• Manufacturer: ONSEMI [ON Semiconductor]

CAT9532
APPLICATION INFORMATION
Programming Example
The following programming sequence is an
example how to set:
Doc. No. MD-9001 Rev. E
– LED0 to LED3: ON
– LED4 to LED7: Dimming at 30% brightness;
– LED8 to LED11: Blink at 2Hz with 50% duty
– LED12 to LED15: OFF
I
2
C/SMBus MASTER
Blink 1: 152Hz, duty cycle 30%
cycle (Blink 2)
V
5V
CC
RESET
GND
SDA
SCL
10kΩ (x 3)
SDA
SCL
RESET
A2
A1
A0
V
SS
CAT9532
V
CC
Figure 10. Typical Application
LED10
LED12
LED13
LED14
LED15
LED11
LED0
LED1
LED2
LED3
LED4
LED5
LED6
LED7
LED8
LED9
Note: LED0 to LED11 are used as LED drivers and LED12 to LED15 are used as regular GPIOs.
10
11
12
1
2
3
4
5
6
7
8
9
12
Command Description
START
Send Slave address, A0-A2 = low
Command Byte: AI=”1”; PSC0 Addr
Set Blink 1 at 152Hz, T_Blink1 = 1/152
Write PSC0 = 0
Set PWM0 duty cycle to 30%
PWM0 / 256 = 0.3; Write PWM0=77
Set Blink 2 at 2Hz, T_Blink1 = 1/2
Write PSC1 = 75
Set PWM1 duty cycle to 50%
PWM1 / 256 = 0.5; Write PWM1=128
Write LS0: LED0 to LED3 = ON
Write LS1: LED4 to LED7 at Blink1
Write LS2: LED8 to LED11 at Blink2
Write LS3: LED12 to LED15 = OFF
STOP
5V
Characteristics subject to change without notice
© 2010 SCILLC. All rights reserved
I
2
C Data
C0h
4Dh
AAh
FFh
4Bh
12h
00h
80h
55h
00h
GPIOs