9532 データシートの表示（PDF） - NXP Semiconductors.

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9532

16-bit I²C-bus LED dimmer

NXP Semiconductors. 

NXP Semiconductors

PCA9532

16-bit I2C-bus LED dimmer

VDD

3.3 V

5V

VDD

LEDn

LED

100 kΩ

VDD

LED

LEDn

002aac189

002aac190

Fig 15. High value resistor in parallel with Fig 16. Device supplied by a lower voltage

the LED

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.

Table 11. Programming PCA9532

Program sequence

START

PCA9532 address with A0 to A2 = LOW

PSC0 subaddress + Auto-Increment

Set prescaler PSC0 to achieve a period of 1 second:

Blink period = 1 = P-----S---C1---5-0--2---+-----1-

PSC0 = 151

Set PWM0 duty cycle to 50 %:

P-----W2---5--M-6-----0- = 0.5

PWM0 = 128

Set prescaler PCS1 to dim at maximum frequency:

Blink period = max

PSC1 = 0

Set PWM1 output duty cycle to 25 %:

P-----W2---5--M-6-----1- = 0.25

PWM1 = 64

Set LED0 to LED3 on

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

Set LED8 to LED11 off

Set LED12 to LED15 off

STOP

I2C-bus

S

C0h

12h

97h

80h

00h

40h

55h

FAh

00h

00h

P

PCA9532_4

Product data sheet

Rev. 04 — 17 March 2009

© NXP B.V. 2009. All rights reserved.

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