PCA9525D,118

Product Overview

Category

PCA9525D,118 belongs to the category of integrated circuits (ICs).

Use

The PCA9525D,118 is commonly used as an I2C-bus/SMBus I/O expander. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C-bus interface.

Characteristics

• I2C-bus and SMBus compatible
• 400 kHz Fast-mode Plus (Fm+) I2C-bus interface
• 5 V tolerant inputs
• 8 programmable I/O pins
• Low standby current consumption
• Open-drain interrupt output
• Noise filter on SDA/SCL inputs
• ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101

Package

The PCA9525D,118 is available in a small package known as TSSOP16.

Essence

The essence of PCA9525D,118 lies in its ability to expand the number of I/O pins of a microcontroller using the I2C-bus interface.

Packaging/Quantity

The PCA9525D,118 is typically packaged in reels containing 2500 units.

Specifications

• Supply voltage: 2.3 V to 5.5 V
• Operating temperature range: -40°C to +85°C
• I/O voltage level: 1.8 V to 5.5 V
• Maximum I2C-bus frequency: 400 kHz
• Standby current: 1 μA (typical)

Detailed Pin Configuration

The PCA9525D,118 has a total of 16 pins. The pin configuration is as follows:

1. SDA (Serial Data)
2. SCL (Serial Clock)
3. INT (Interrupt Output)
4. GND (Ground)
5. P0 (Programmable I/O Pin 0)
6. P1 (Programmable I/O Pin 1)
7. P2 (Programmable I/O Pin 2)
8. P3 (Programmable I/O Pin 3)
9. VDD (Supply Voltage)
10. P4 (Programmable I/O Pin 4)
11. P5 (Programmable I/O Pin 5)
12. P6 (Programmable I/O Pin 6)
13. P7 (Programmable I/O Pin 7)
14. A0 (Address Input 0)
15. A1 (Address Input 1)
16. NC (No Connection)

Functional Features

The PCA9525D,118 offers the following functional features:

• I2C-bus/SMBus compatible interface for easy integration with microcontrollers
• 8 programmable I/O pins for flexible usage
• Low standby current consumption for power efficiency
• Open-drain interrupt output for event notification
• Noise filter on SDA/SCL inputs to improve signal integrity
• ESD protection exceeding industry standards for robustness

Advantages and Disadvantages

Advantages

• Provides additional I/O pins for microcontrollers without requiring extensive hardware modifications
• Compatible with popular I2C-bus and SMBus interfaces
• Low standby current consumption helps conserve power
• Offers noise filtering and ESD protection for reliable operation

Disadvantages

• Limited number of programmable I/O pins (8 in total)
• Requires understanding and implementation of I2C-bus communication protocol

Working Principles

The PCA9525D,118 works by acting as an I/O expander for microcontrollers. It communicates with the microcontroller via the I2C-bus interface, allowing the microcontroller to control and read the status of the 8 programmable I/O pins. The device operates as a slave on the I2C-bus and can be addressed using different address combinations.

Detailed Application Field Plans

The PCA9525D,118 finds applications in various fields, including but not limited to:

1. Industrial automation: Used for remote I/O expansion in industrial control systems.
2. Consumer electronics: Enables additional I/O capabilities in devices such as smart home controllers and IoT devices.
3. Automotive: Utilized for expanding I/O options in automotive control modules.
4. Medical devices: Provides extra I/O pins for medical equipment requiring connectivity with microcontrollers.
5. Robotics: Used for I/O expansion in robotic systems, enabling control of peripheral devices.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to PCA9525D,118 are:

1. PCA9554PW,112
2. MCP23017-E/SP
3. TCA9539PW,118
4. MAX7313ATG+
5. PCF8574T/3