參數(shù)資料
型號(hào)： 9531
廠商： NXP Semiconductors N.V.
英文描述： 8-bit I2C LED dimmer
中文描述： 8位I2C LED調(diào)光
文件頁數(shù)： 10/20頁
文件大?。?/td> 154K
代理商： 9531
Philips Semiconductors
Product data
PCA9531
8-bit I
2
C LED dimmer
2003 Nov 10
10
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.
I
2
C-bus
Start
S
PCA9531 address with A0-A2 = low
C0h
PSC0 subaddress + auto-increment
11h
Set prescaler PSC0 to achieve a period of 1 second:
Blink period
1
PSC0
1
152
PSC0 = 151
97h
Set PWM0 duty cycle to 50%:
PWM0
256
0.5
PWM0 = 128
80h
Set prescaler PCS1 to dim at max frequency:
Blink period
max
PSC1 = 0
00h
Set PWM1 output duty cycle to 25%:
PWM1
256
0.25
PWM1 = 64
40h
Set LED0 to LED3 on
55h
Set LED4 and 5 to PWM0, and LED6 or 7 to PWM1
FAh
Stop
P
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