PCA9538DBRG4

Product Overview

Category: Integrated Circuit (IC)

Use: GPIO Expander

Characteristics: - 8-bit I/O expander for I2C-bus/SMBus applications - Low standby current consumption of 1 µA - Supports 100 kHz and 400 kHz I2C-bus speeds - Open-drain interrupt output - Active-low reset input - Noise filter on SCL/SDA inputs - 5 V tolerant I/O ports - ESD protection exceeds JESD 22, 2000-V human-body model (A114-A) - Available in SOIC-16 package

Package: SOIC-16

Essence: PCA9538DBRG4 is an integrated circuit that serves as an 8-bit I/O expander for I2C-bus/SMBus applications. It allows for easy expansion of general-purpose input/output (GPIO) capabilities of microcontrollers or other devices.

Packaging/Quantity: PCA9538DBRG4 is available in a standard SOIC-16 package. The quantity per package may vary depending on the supplier.

Specifications

• Supply Voltage Range: 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 and 400 kHz
• Standby Current: 1 µA (maximum)
• Output Current: 25 mA (maximum)

Detailed Pin Configuration

The PCA9538DBRG4 has a total of 16 pins arranged as follows:

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| | | 1 2 3 | | | | 4 5 6 | | | | 7 8 9 | | | | 10 11 12 | | | | 13 14 15 | |_______________| ```

1. SCL - Serial Clock Input
2. SDA - Serial Data Input/Output
3. A0 - Address Select Input
4. A1 - Address Select Input
5. A2 - Address Select Input
6. RESET - Active-Low Reset Input
7. INT - Open-Drain Interrupt Output
8. P0 - General Purpose I/O Port 0
9. P1 - General Purpose I/O Port 1
10. P2 - General Purpose I/O Port 2
11. P3 - General Purpose I/O Port 3
12. P4 - General Purpose I/O Port 4
13. P5 - General Purpose I/O Port 5
14. P6 - General Purpose I/O Port 6
15. P7 - General Purpose I/O Port 7
16. VDD - Supply Voltage

Functional Features

• The PCA9538DBRG4 provides 8 programmable I/O pins that can be used as inputs or outputs.
• It supports the I2C-bus/SMBus communication protocol, allowing easy integration with microcontrollers and other devices.
• The device has a low standby current consumption of 1 µA, making it suitable for power-sensitive applications.
• It features an open-drain interrupt output (INT) that can be used to signal events to the host controller.
• The active-low reset input (RESET) allows for resetting the device to its default state.
• The PCA9538DBRG4 includes noise filters on the SCL/SDA inputs to improve signal integrity.
• It is designed to be 5 V tolerant, allowing for compatibility with both 3.3 V and 5 V systems.
• The device provides ESD protection exceeding JESD 22 standards, ensuring robustness against electrostatic discharge.

Advantages and Disadvantages

Advantages: - Easy expansion of GPIO capabilities - Low standby current consumption - Supports multiple I2C-bus speeds - Open-drain interrupt output for event signaling - 5 V tolerant I/O ports - ESD protection for enhanced reliability

Disadvantages: - Limited number of I/O pins (8 in total)

Working Principles

The PCA9538DBRG4 operates as an I2C-bus/SMBus slave device. It communicates with the host controller using the I2C-bus protocol, allowing for control and monitoring of the 8 programmable I/O pins. The device can be configured as inputs or outputs individually, providing flexibility in usage. It features an interrupt output that can be used to notify the host controller of specific events. The active-low reset input allows for resetting the device to its default state.

Detailed Application