PCA9534BS3 datasheet(10/25 Pages) NXP

Part #	PCA9534BS3

Description	8-bit I2C-bus and SMBus low power I/O port with interrupt

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Manufacturer	NXP [NXP Semiconductors]

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PCA9534_3

Product data sheet

Rev. 03 — 6 November 2006

10 of 25

NXP Semiconductors

PCA9534

8-bit I2C-bus and SMBus low power I/O port with interrupt

7.

Application design-in information

7.1 Minimizing IDD when the I/O us 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 12. 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.

Designs needing to minimize current consumption, such as battery power applications,

should consider maintaining the IOn pins greater than or equal to VDD when the LED is

off. Figure 13 shows a high value resistor in parallel with the LED. Figure 14 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.

Device address conﬁgured as 0100 100X for this example.

IO0, IO1, IO2 conﬁgured as outputs.

IO3, IO4, IO5 conﬁgured as inputs.

IO6, IO7 are not used and must be conﬁgured as outputs.

Fig 12. Typical application

PCA9534

IO0

IO1

SCL

SDA

VDD

002aac476

SCL

SDA

IO2

IO3

VDD

VSS

MASTER

CONTROLLER

VSS

VDD (5 V)

2 k

Ω

SUBSYSTEM 1

(e.g., temp. sensor)

INT

SUBSYSTEM 2

(e.g., counter)

RESET

controlled switch

(e.g., CBT device)

A

B

enable

INT

5 V

INT

10 k

Ω

10 k

Ω

SUBSYSTEM 3

(e.g., alarm system)

ALARM

IO4

IO5

VDD

A2

A1

A0

IO6

IO7

100 k

Ω

(

× 3)

10 k

Ω

10 k

Ω

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