PCA9532 Philips Semiconductors (Acquired by NXP), PCA9532 Datasheet - Page 11

• Manufacturer Part Number: PCA9532
• Description: PCA9532; 16-bit I2C Led Dimmer
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
Programming example
The following example will show how to set LED0 to LED3 on. It will
then set LED4 and LED5 to blink at 1 Hz at a 50% duty cycle. LED6
and LED7 will be set to be dimmed at 25% of their brightness (duty
cycle = 25%). LED8 to LED15 will be set to off.
Table 1.
2003 May 02
Start
PCA9532 address with A0-A2 = LOW
PSC0 subaddress + auto-increment
Set prescaler PSC0 to achieve a period of 1 second:
Set PWM0 duty cycle to 50%:
Set prescaler PCS1 to dim at maximum frequency
Set PWM1 output duty cycle to 25%:
Set LED0 to LED3 on
Set LED4 and 5 to PWM0, and LED6 or 7 to PWM1
Set LED8 to LED11 off
Set LED12 to LED15 off
Stop
16-bit I
PWM0
PWM1
256
256
Blink period + 1 + PSC0 ) 1
Blink period + maximum
PWM0 = 128
+ 0.5
+ 0.25
PWM1 = 64
2
PSC0 = 151
C LED dimmer
PSC1 = 0
152
I
S
C0h
12h
97h
80h
00h
40h
55h
FAh
00h
00h
P
2
C-bus
11
PCA9532
Product data