PCA9530_3

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 03 — 26 February 2009

11 of 24

NXP Semiconductors

PCA9530

8.2 Programming example

The following example will show how to set LED0 to blink at 1 Hz at a 50 % duty cycle.

LED1 will be set to be dimmed at 25 % of their maximum brightness (duty cycle = 25 %).

9.

Limiting values

Table 10.

Programming PCA9530

Program sequence

START

S

PCA9530 address with A0 = LOW

C0h

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 to PWM0, and set LED1 to blink at PWM1

0Eh

STOP

P

Blink period

1

PSC0

1

+

152

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

==

PWM 0

256

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

0.5

=

Blink period

max

=

PWM 1

256

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

0.25

=

Table 11.

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

-

50

mA

total power dissipation

-

400

mW

storage temperature

−65

+150

°C

ambient temperature

operating

−40

+85

°C