PCA9533_3

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 03 — 27 April 2009

12 of 24

NXP Semiconductors

PCA9533

8.2 Programming example

The following example will show how to set LED0 and LED1 off. It will set LED2 to blink at

1 Hz at a 50 % duty cycle. LED3 will be set to be dimmed at 25 % of their maximum

brightness (duty cycle = 25 %). PCA9533/01 is used in this example.

9.

Limiting values

Table 11.

Programming PCA9533

Program sequence

START

S

PCA9533 address

C4h

PSC0 subaddress + Auto-Increment

11h

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 on, LED1 off; LED2 set to blink at PSC0, PWM0; LED3 set to blink at

PSC1, PWM1

E1h

STOP

P

Blink period

1

PSC0

1

+

152

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

==

PWM 0

256

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

0.5

=

Blink period

max

=

PWM 1

256

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

0.25

=

Table 12.

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol

Parameter

Conditions

Min

Max

Unit

supply voltage

−0.5

+6.0

V

voltage on an input/output pin

5.5

V

output current on pin LEDn

-

25

mA

ground supply current

-

100

mA

total power dissipation

-

400

mW

storage temperature

−65

+150

°C

ambient temperature

operating

−40

+85

°C