CAT9532_16 Datasheet, PDF (11/14 Pages) ON Semiconductor – 16-bit Programmable LED Dimmer

CAT9532
Application Information
Programming Example
The following programming sequence is an example how
to set:
• LED0 to LED3: ON
• LED4 to LED7: Dimming at 30% brightness; Blink 1:
152 Hz, duty cycle 30%
• LED8 to LED11: Blink at 2 Hz with 50% duty cycle
(Blink 2)
• LED12 to LED15: OFF
5V
5V
V_CC
SDA
SCL
RESET
GND
I²C/SMBus
MASTER
10 kW (x 3)
V_CC
SDA
LED0
LED1
LED2
SCL
LED3
LED4
RESET LED5
LED6
CAT9532 ^LED7
LED8
LED9
A2
LED10
A1
LED11
A0
LED12
V_SS
LED13
LED14
LED15
Figure 14. Typical Application
GPIOs
Command Description
1 START
2 Send Slave address, A0−A2 = low
3 Command Byte: AI=”1”; PSC0 Addr
4 Set Blink 1 at 152Hz, T_Blink1 = 1/152
Write PSC0 = 0
5 Set PWM0 duty cycle to 30%
PWM0 / 256 = 0.3; Write PWM0=77
6 Set Blink 2 at 2Hz, T_Blink1 = 1/2
Write PSC1 = 75
7 Set PWM1 duty cycle to 50%
PWM1 / 256 = 0.5; Write PWM1=128
8 Write LS0: LED0 to LED3 = ON
9 Write LS1: LED4 to LED7 at Blink1
10 Write LS2: LED8 to LED11 at Blink2
11 Write LS3: LED12 to LED15 = OFF
12 STOP
I²C Data
C0h
12h
00h
4Dh
4Bh
80h
55h
AAh
FFh
00h
Figure 15. q_JA Transient Response Curve for TSSOP−24
Table 11. THERMAL RATINGS
Parameters
q_JA TSSOP−24 (Note 8)
8. Based on JEDEC EIA/JESD51−3 (2.0 oz Cu, 100 mm²)
Ratings
124
Units
°C/W
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