PCA9538D,112

Product Overview

Category

PCA9538D,112 belongs to the category of integrated circuits (ICs).

Use

The PCA9538D,112 is commonly used as an 8-bit I2C-bus and SMBus I/O expander. It provides remote I/O expansion for most microcontroller families via the I2C-bus interface.

Characteristics

• 8-bit remote I/O ports
• Low standby current consumption
• Compatible with I2C-bus and SMBus interfaces
• Internal power-on reset
• Noise filter on SCL/SDA inputs
• No glitch on power-up
• Supports hot insertion
• Active-low reset input
• Polarity inversion register
• Open-drain interrupt output
• ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101

Package

The PCA9538D,112 is available in a small package known as TSSOP20.

Essence

The essence of PCA9538D,112 lies in its ability to provide additional I/O ports for microcontrollers through the I2C-bus interface.

Packaging/Quantity

The PCA9538D,112 is typically sold in reels, with each reel containing 2500 units.

Specifications

• Supply voltage: 2.3 V to 5.5 V
• Input voltage range: GND to VDD
• Operating temperature range: -40°C to +85°C
• I2C-bus frequency: 100 kHz, 400 kHz, or 1 MHz

Detailed Pin Configuration

The PCA9538D,112 has a total of 20 pins. The pin configuration is as follows:

1. SDA (Serial Data)
2. SCL (Serial Clock)
3. INT (Interrupt Output)
4. RESET (Active-Low Reset Input)
5. A0 (Address Select Bit 0)
6. A1 (Address Select Bit 1)
7. A2 (Address Select Bit 2)
8. VDD (Supply Voltage)
9. GND (Ground)
10. P00 (I/O Port 0)
11. P01 (I/O Port 1)
12. P02 (I/O Port 2)
13. P03 (I/O Port 3)
14. P04 (I/O Port 4)
15. P05 (I/O Port 5)
16. P06 (I/O Port 6)
17. P07 (I/O Port 7)
18. NC (No Connection)
19. NC (No Connection)
20. NC (No Connection)

Functional Features

The PCA9538D,112 offers the following functional features:

• 8 programmable I/O ports
• Individual direction control for each I/O port
• Internal power-on reset
• Interrupt output for port status change detection
• Address selection through three address select bits
• Compatibility with I2C-bus and SMBus interfaces

Advantages and Disadvantages

Advantages

• Provides additional I/O ports for microcontrollers
• Low standby current consumption
• Supports hot insertion
• ESD protection exceeds industry standards

Disadvantages

• Limited to 8-bit remote I/O ports
• Requires an I2C-bus or SMBus interface for communication

Working Principles

The PCA9538D,112 operates by communicating with a microcontroller through the I2C-bus or SMBus interface. It allows the microcontroller to control and monitor the state of the 8 I/O ports remotely. The device can be addressed using the address select bits (A0, A1, and A2) to avoid conflicts with other devices on the bus. The microcontroller can set the direction of each I/O port as input or output individually. Changes in the state of the I/O ports can be detected through the interrupt output pin (INT).

Detailed Application Field Plans

The PCA9538D,112 finds applications in various fields, including but not limited to:

1. Industrial automation
2. Home automation
3. Internet of Things (IoT) devices
4. Robotics
5. Automotive electronics
6. Consumer electronics

In industrial automation, it can be used to expand the number of I/O ports available for controlling sensors, actuators, and other devices. In home automation, it can enable the control of lights, appliances, and security systems. In IoT devices, it can provide additional I/O ports for connecting various sensors and actuators. In robotics, it can be utilized for controlling motors, sensors, and communication interfaces. In automotive electronics, it can assist in managing various vehicle systems. In consumer electronics, it can enhance the