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NXP Semiconductors
PCA9550
2-bit I 2 C-bus LED driver with programmable blink rates
8. Application design-in information
5V
5V
I 2 C-BUS/SMBus
MASTER
10 k ?
10 k ?
10 k ?
V DD
PCA9550
SDA
SCL
SDA
SCL
LED0
LED1
RESET
A0
V SS
002aad271
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 .
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
PCA9550_5
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. 2008. All rights reserved.
Product data sheet
Rev. 05 — 13 October 2008
11 of 26
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