9535 查看數據表（PDF） - Philips Electronics

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9535

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

Philips Electronics 

Philips Semiconductors

16-bit I2C and SMBus, low power I/O port with interrupt

Product data

PCA9535

TYPICAL APPLICATION

VDD

VDD

1.6 kΩ 1.6 kΩ 1.1 kΩ 2 kΩ

MASTER

CONTROLLER

SCL

SDA

INT

GND

VDD

SCL

SDA

INT

I/O0.0

I/O0.1

I/O0.2

I/O0.3

I/O0.4

I/O0.5

PCA9535

I/O0.6

I/O0.7

A2

I/O1.0

I/O1.1

A1

I/O1.2

I/O1.3

A0

I/O1.4

I/O1.5

I/O1.6

VSS I/O1.7

2 kΩ

SUBSYSTEM 1

(e.g. temp sensor)

INT

SUBSYSTEM 2

(e.g. counter)

RESET

A

ALARM

SUBSYSTEM 3

(e.g. alarm system)

ENABLE

B

VDD

Controlled Switch

(e.g. CBT device)

10 DIGIT

NUMERIC

KEYPAD

NOTE: Device address configured as 0100100 for this example

I/O0.0, I/O0.1, I/O0.2, configured as outputs

I/O0.3, I/O0.4, I/O0.5, configured as inputs

I/O0.6, I/O0.7, and I/O1.0 to I/O1.7 configured as inputs

SW02094

Figure 11. Typical application

Minimizing IDD when the I/O is 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 11. Since the LED acts as a

diode, when the LED is off the I/O VIN is about 1.2 V less than VDD. The supply current, IDD, increases as VIN becomes lower than VDD and is

specified as ∆IDD in the DC characteristics table.

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 12 shows a high value resistor in parallel with the LED. Figure 13 shows VDD less than the LED supply

voltage by at least 1.2 V. Both of these methods maintain the I/O VIN at or above VDD and prevents additional supply current consumption when

the LED is off.

VDD

3.3 V

5V

VDD

LEDx

LED

100 k

SW02086

Figure 12. High value resistor in parallel with the LED

2003 Jun 27

10

VDD

LEDx

LED

SW02087

Figure 13. Device supplied by a lower voltage

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