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NXP Semiconductors
PCA9531
8-bit I 2 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 %).
Table 10.
Programming PCA9531
Program sequence
START
PCA9531 address with A0 to A2 = LOW
PSC0 subaddress + Auto-Increment
Set prescaler PSC0 to achieve a period of 1 second:
PSC0 + 1
Blink period = 1 = ------------------------
152
PSC0 = 151
Set PWM0 duty cycle to 50 %:
PWM0
----------------- = 0.5
256
PWM0 = 128
Set prescaler PCS1 to dim at maximum frequency:
Blink period = max
PSC1 = 0
Set PWM1 output duty cycle to 25 %:
PWM1
----------------- = 0.25
256
PWM1 = 64
Set LED0 to LED3 on
Set LED4 and LED5 to PWM0, and LED6 or LED7 to PWM1
STOP
9. Limiting values
Table 11. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
I 2 C-bus
S
C0h
11h
97h
80h
00h
40h
55h
FAh
P
Symbol
V DD
V I/O
I O(LEDn)
I SS
P tot
T stg
T amb
Parameter
supply voltage
voltage on an input/output pin
output current on pin LEDn
ground supply current
total power dissipation
storage temperature
ambient temperature
Conditions
operating
Min
? 0.5
V SS ? 0.5
-
-
-
? 65
? 40
Max
+6.0
5.5
± 25
200
400
+150
+85
Unit
V
V
mA
mA
mW
° C
° C
PCA9531_6
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 — 19 February 2009
13 of 27
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