PCA9533D PHILIPS [NXP Semiconductors], PCA9533D Datasheet - Page 9

• Manufacturer Part Number: PCA9533D
• Description: 4-bit I2C LED dimmer
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
APPLICATION DATA
Minimizing I
When the I/Os are used to control LEDs, they are normally connected to V
diode, when the LED is off the I/O V
specified as I
Designs needing to minimize current consumption, such as battery power applications, should consider maintaining the I/O pins greater than or
equal to V
voltage by at least 1.2 V. Both of these methods maintain the I/O V
the LED is off.
2004 Oct 01
4-bit I
Figure 14. High value resistor in parallel with the LED
DD
2
when the LED is off. Figure 14 shows a high value resistor in parallel with the LED. Figure 15 shows V
C LED dimmer
DD
DD
in the DC characteristics table.
when the I/O is used to control LEDs
V
DD
LEDx
I
2
C/SMBus MASTER
5 V
LED
IN
SDA
SCL
is about 1.2 V less than V
100 k
V
10 k
DD
Figure 13. Typical application
10 k
SW02086
DD
IN
. The supply current, I
V
SDA
SCL
SS
at or above V
9
PCA9533
DD
V
DD
through a resistor as shown in Figure 13. Since the LED acts as a
DD
LED0
LED1
LED2
LED3
Figure 15. Device supplied by a lower voltage
and prevents additional supply current consumption when
DD
, increases as V
V
3.3 V
5 V
DD
LEDx
IN
becomes lower than V
LED
DD
5 V
less than the LED supply
PCA9533
Product data sheet
SW02047
DD
SW02087
and is