PCA9532 datasheet(14/29 Pages) NXP

14 / 29 page

PCA9532_4

Product data sheet

Rev. 04 — 17 March 2009

14 of 29

NXP Semiconductors

PCA9532

16-bit I2C-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

VDD

LEDn

100 k

Ω

VDD

002aac190

LED

VDD

LEDn

3.3 V

5 V

Table 11.

Programming PCA9532

Program sequence

I2C-bus

START

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

Blink period

PSC0

152

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

PWM 0

256

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

0.5

Blink period

max

PWM 1

256

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

0.25

PCA9532 Arkusz danych(PDF) 14 Page - NXP Semiconductors

PCA9532 Arkusz danych(HTML) 14 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

Arkusz danych Pobierz

Link URL