參數(shù)資料
型號: PCA9551
廠商: NXP Semiconductors N.V.
元件分類: LED驅(qū)動器
英文描述: 8-bit I2C LED driver with programmable blink rates
中文描述: 8位I2C LED與可編程閃爍率司機
文件頁數(shù): 11/21頁
文件大?。?/td> 161K
代理商: PCA9551
Philips Semiconductors
Product data sheet
PCA9551
8-bit I
2
C LED driver with programmable blink rates
2004 Oct 01
11
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 blink at 4 Hz and at a 25% duty cycle.
Table 1.
I
2
C-bus
Start
S
PCA9551 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
38
PSC0 = 37
25h
Set PWM0 duty cycle to 50%:
256 – PWM0
256
0.5
PWM0 = 128
80h
Set prescaler PCS1 to achieve a period of 0.25
seconds:
Blink period
0.25
PSC1
1
38
PSC1 = 9
09h
Set PWM1 output duty cycle to 25%:
256 – PWM1
256
0.25
PWM1 = 192
C0h
Set LED0 to LED3 on
00h
Set LED4 and 5 to PWM0, and LED6 or 7 to PWM1
FAh
Stop
P
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