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NXP Semiconductors
PCA9531
8-bit I 2 C-bus LED dimmer
8. Application design-in information
3.3 V
5V
I 2 C-BUS/SMBus
MASTER
10 k ?
10 k ?
10 k ?
V DD
PCA9531
SDA
SCL
SDA
SCL
RESET
LED0
LED1
LED2
LED3
LED4
LED5
A2
LED6
LED7
GPIOs
A1
A0
V SS
002aac523
LED0 to LED5 are used as LED drivers.
LED6 and LED7 are used as regular GPIOs.
Fig 14. Typical application
8.1 Minimizing I DD when the I/Os are used to control LEDs
When the I/Os are used to control LEDs, they are normally connected to V DD through a
resistor as shown in Figure 14 . Since the LED acts as a diode, when the LED is off the
I/O V I is about 1.2 V less than V DD . The supply current, I DD , increases as V I becomes
lower than V DD and is speci?ed as ? I DD in Table 12 “Static characteristics” .
Designs needing to minimize current consumption, such as battery power applications,
should consider maintaining the I/O pins greater than or equal to V DD when the LED is off.
Figure 15 shows a high value resistor in parallel with the LED. Figure 16 shows V DD less
than the LED supply voltage by at least 1.2 V. Both of these methods maintain the I/O V I
at or above V DD and prevents additional supply current consumption when the LED is off.
V DD
3.3 V
5V
V DD
LED
100 k ?
V DD
LED
PCA9531_6
LEDn
002aac189
Fig 15. High value resistor in parallel with
the LED
LEDn
002aac190
Fig 16. Device supplied by a lower voltage
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 — 19 February 2009
12 of 27
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