PCA9531BS PHILIPS [NXP Semiconductors], PCA9531BS Datasheet - Page 10

• Manufacturer Part Number: PCA9531BS
• Description: 8-bit I2C LED dimmer
• Manufacturer: PHILIPS [NXP Semiconductors]

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 maximum
brightness (duty cycle = 25%).
Table 1.
2003 Nov 10
Start
PCA9531 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 max 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
Stop
8-bit I
PWM1
256
PWM0
Blink period + 1 + PSC0 ) 1
256
Blink period + max
2
+ 0.25
PWM1 = 64
C LED dimmer
+ 0.5
PWM0 = 128
PSC0 = 151
PSC1 = 0
152
I
S
C0h
11h
97h
80h
00h
40h
55h
FAh
P
2
C-bus
10
PCA9531
Product data