MaxTech NXP-16 Manual de usuario descargar pdf (Pagina 14)

Product data sheet Rev. 04 — 17 March 2009 14 of 29

NXP Semiconductors

PCA9532

16-bit I

C-bus LED dimmer

8.2 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 %). LED8 to LED15 will be set to off.

Fig 15. High value resistor in parallel with

the LED

Fig 16. Device supplied by a lower voltage

002aac189

LED

LEDn

100 kΩ

002aac190

LED

LEDn

3.3 V 5 V

Table 11. Programming PCA9532

Program sequence I

C-bus

START S

PCA9532 address with A0 to A2 = LOW C0h

PSC0 subaddress + Auto-Increment 12h

Set prescaler PSC0 to achieve a period of 1 second:

PSC0 = 151

97h

Set PWM0 duty cycle to 50 %:

PWM0 = 128

80h

Set prescaler PCS1 to dim at maximum frequency:

PSC1 = 0

00h

Set PWM1 output duty cycle to 25 %:

PWM1 = 64

40h

Set LED0 to LED3 on 55h

Set LED4 and LED5 to PWM0, and LED6 or LED7 to PWM1 FAh

Set LED8 to LED11 off 00h

Set LED12 to LED15 off 00h

STOP P

Blink period 1

PSC0 1+

152

------------------------

PWM0

256

-----------------

0.5=

Blink period max=

PWM1

256

-----------------

0.25=

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 28 29

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MaxTech NXP-16 Manual de usuario Pagina 14

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