參數資料
型號: PCA9530
廠商: NXP Semiconductors N.V.
英文描述: 2-bit I2C LED dimmer
中文描述: 2位I2C LED調光
文件頁數: 9/16頁
文件大小: 123K
代理商: PCA9530
Philips Semiconductors
Preliminary data
PCA9530
2-bit I
2
C LED dimmer
2002 Dec 12
9
Programming example
The following example will show how to set LED0 to blink at 1 Hz at
a 50% duty cycle. LED1 will be set to be dimmed at 25% of their
maximum brightness (duty cycle = 25%).
Table 1.
I
2
C-bus
Start
S
PCA9530 address with A0 = low
COh
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
PWM0 = 128
0.5
80h
Set prescaler PCS1 to dim at maximum frequency.
Blink period
maximum
PSC1 = 0
00h
Set PWM1 output duty cycle to 25%:
PWM1
256
PWM1 = 64
0.25
40h
Set LED0 to PWM0 and set LED1 to blink at PWM1
OEh
Stop
P
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