CAT9552 ONSEMI [ON Semiconductor], CAT9552 Datasheet - Page 12

• Manufacturer Part Number: CAT9552
• Description: 16-Channel I2C-bus LED Driver with Programmable Blink Rate
• Manufacturer: ONSEMI [ON Semiconductor]

CAT9552
APPLICATION INFORMATION
Programming Example
The following programming sequence is an
example how to set:
Doc. No. MD-9005 Rev D
– LED0 to LED3: ON
– LED4 to LED7: Blink at 1Hz with a 50% duty
– LED8 to LED11: Blink at 4Hz with a 20% duty
– LED12 to LED15: OFF
I
2
C/SMBus MASTER
cycle (Blink 0)
cycle (Blink 1)
V
5V
CC
RESET
GND
SDA
SCL
10kΩ (x 3)
SDA
SCL
RESET
A2
A1
A0
V
SS
CAT9552
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 0 at 1Hz, T_Blink1 =
(PSC0+1)/44 = 1
Write PSC0 = 43
Set PWM0 duty cycle to 50%
(256-PWM0) / 256 = 0.5
Write PWM0=128
Set Blink 1 at 4Hz, T_Blink1 =
(PSC1+1)/44 = 0.25
Write PSC1 = 10
Set PWM1 duty cycle to 25%
(256-PWM1) / 256 = 0.25
Write PWM1=192
Write LS0: LED0 to LED3 = ON
Write LS1: LED4 to LED7 at Blink0
Write LS2: LED8 to LED11 at Blink1
Write LS3: LED12 to LED15 = OFF
STOP
5V
Characteristics subject to change without notice
© 2010 SCILLC. All rights reserved
I
2
C Data
C0h
C0h
AAh
FFh
2Bh
0Ah
12h
80h
00h
55h
GPIOs