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9532

16-bit I²C-bus LED dimmer

NXP Semiconductors. 

NXP Semiconductors

8. Application design-in information

PCA9532

16-bit I2C-bus LED dimmer

5V

5V

10 kΩ

I2C-BUS/SMBus

MASTER

SDA

SCL

10 kΩ

10 kΩ

VDD

PCA9532

SDA

LED0

SCL

LED1

LED2

LED3

RESET

LED4

LED5

LED6

LED7

LED8

A2

LED9

LED10

A1

LED11

A0

LED12

VSS

LED13

LED14

LED15

LED0 to LED12 are used as LED drivers.

LED13 to LED15 are used as regular GPIOs.

Fig 14. Typical application

GPIOs

002aae522

8.1 Minimizing IDD when the I/Os are used to control LEDs

When the I/Os are used to control LEDs, they are normally connected to VDD through a

resistor as shown in Figure 14. Since the LED acts as a diode, when the LED is off the

I/O VI is about 1.2 V less than VDD. The supply current, IDD, increases as VI becomes

lower than VDD and is specified as ∆IDD in Table 13 “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 VDD when the LED is off.

Figure 15 shows a high value resistor in parallel with the LED. Figure 16 shows VDD less

than the LED supply voltage by at least 1.2 V. Both of these methods maintain the I/O VI

at or above VDD and prevents additional supply current consumption when the LED is off.

PCA9532_4

Product data sheet

Rev. 04 — 17 March 2009

© NXP B.V. 2009. All rights reserved.

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