PCA9538PW 8-bit I2C I/O Expander with Low Voltage Operation Interrupt Output Polarity Inversion Low Standby Current and Small Package for Servers LCDs & Industrial Control

Features

• Low standby current consumption of 1 μA max

• I2C to parallel port expander

• Open-drain active-low interrupt output

• Active-low reset input

• Operating power-supply voltage range of 2.3 V to 5.5 V

• 5-V Tolerant I/O ports

• 400-kHz Fast I2C bus

• Two hardware address pins allow up to four devices on the I2C/SMBus

• Input and output configuration register

• Polarity inversion register

• Power-up with all channels configured as inputs

• No glitch on power up

• Noise filter on SCL/SDA inputs

• Latched outputs with high-current drive maximum capability for directly driving LEDs

• Latch-up performance exceeds 100 mA Per JESD 78, class II

• ESD protection exceeds JESD 22

– 2000-V Human-body model (A114-A)

– 200-V Machine model (A115-A)

– 1000-V Charged-device model (C101)

Applications

1. Servers and Data Center Hardware

Key Advantages Utilized: The I²C interface enables centralized management, while the interrupt output function allows real-time response to status changes, making it suitable for high-density hardware monitoring.

Typical Applications: Fan control on server motherboards, power status monitoring, hot-swap backplane signal expansion, and chassis sensor management.

2. Industrial Control and Automation

Key Advantages Utilized: Wide voltage compatibility (1.65V to 5.5V) and industrial temperature range support harsh environments; interrupt functionality reduces MCU polling overhead.

Typical Applications: PLC I/O expansion, sensor status acquisition, motor controller interfaces, industrial panel button and indicator control.

3. Consumer Electronics and Display Devices

Key Advantages Utilized: Small package (TSSOP-16) saves space, low standby current extends battery life, and polarity inversion simplifies circuit design.

Typical Applications: Smart appliance control boards, LCD TV/monitor key interfaces, drone remote controllers, smart home sensor nodes.

4. Embedded Systems and IoT Devices

Key Advantages Utilized: The I²C bus saves MCU pin resources, low power consumption suits battery-powered scenarios, and configurable I/O direction enhances flexibility.

Typical Applications: IoT gateway interface expansion, embedded development board functionality expansion, battery-powered data loggers, portable device control.

Description

The PCA9538 is an 8-bit I/O expander of general purpose parallel input and output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus) protocol. This device can operate with a power supply range from 2.3 V to 5.5 V. This device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. This device, along with other I/O expanders, provides a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and so on.

The features of PCA9538 include an interrupt that is generated on the INT pin whenever an input port changes state. The A0 and A1 hardware selectable address pins allow up to four PCA9538 devices on the same I2C bus. This device can also be reset to its default state by using the RESET feature or by cycling the power supply to cause a power-on reset.

INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C bus. Thus, the PCA9538 can remain a simple slave device.

The device outputs (latched) have high-current drive capability for directly driving LEDs. It has low current consumption.

Two hardware pins (A0 and A1) are used to program and vary the fixed I2C address and allow up to four devices to share the same I2C bus or SMBus.

INFORMATION

Drawing

Our advantage :phones, PDA's, notebook comput.ers

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