PCAL6416AEVJ

Product Overview

• Category: Integrated Circuit (IC)
• Use: GPIO Expander
• Characteristics:
  • Low-voltage translating, 16-bit I2C-bus/SMBus I/O expander
  • Open-drain interrupt output
  • Active LOW reset input
  • 400 kHz Fast-mode Plus I2C-bus interface
  • 1.65 V to 5.5 V operating voltage range
  • 5 V tolerant I/Os
  • 20 mA current sink capability on all I/O pins
  • Latch-up performance exceeds 100 mA per JESD 78, Class II
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: The PCAL6416AEVJ is a versatile GPIO expander IC that provides additional general-purpose input/output (GPIO) pins for microcontrollers or other digital devices.
• Packaging/Quantity: Available in reels of 2500 units.

Specifications

• Operating Voltage Range: 1.65 V to 5.5 V
• I/O Voltage Range: 1.65 V to 5.5 V
• Maximum Current Sink Capability: 20 mA per pin
• Interface: I2C-bus/SMBus
• Interface Speed: Up to 400 kHz
• Interrupt Output: Open-drain
• Reset Input: Active LOW
• Latch-Up Performance: Exceeds 100 mA per JESD 78, Class II

Detailed Pin Configuration

The PCAL6416AEVJ has a total of 24 pins, which are assigned as follows:

• Pins 1 to 8: GPIO0 to GPIO7
• Pins 9 to 16: GPIO8 to GPIO15
• Pin 17: INT (Interrupt Output)
• Pin 18: RESET (Active LOW Reset Input)
• Pins 19 and 20: VCC (Power Supply)
• Pins 21 and 22: GND (Ground)
• Pins 23 and 24: SDA (I2C-bus Serial Data) and SCL (I2C-bus Serial Clock)

Functional Features

1. GPIO Expansion: The PCAL6416AEVJ provides 16 additional GPIO pins, allowing the user to expand the number of available I/Os on a microcontroller or digital device.
2. Low-Voltage Translation: The IC supports voltage translation between different voltage domains, enabling seamless communication between devices operating at different voltage levels.
3. Interrupt Output: The open-drain interrupt output pin can be used to signal events or trigger interrupts in the connected microcontroller or system.
4. Reset Functionality: The active LOW reset input allows for resetting the IC and restoring it to its default state.
5. Fast-mode Plus I2C Interface: The IC supports high-speed communication with the host microcontroller using the I2C-bus/SMBus interface, with a maximum speed of 400 kHz.
6. Wide Operating Voltage Range: The PCAL6416AEVJ operates reliably within a voltage range of 1.65 V to 5.5 V, making it compatible with a wide range of systems.
7. 5 V Tolerant I/Os: The IC's I/O pins are 5 V tolerant, allowing direct interfacing with devices operating at higher voltages.
8. Current Sink Capability: Each I/O pin can sink up to 20 mA of current, providing flexibility for driving various loads.

Advantages and Disadvantages

Advantages: - Provides additional GPIO pins for expanding I/O capabilities - Supports voltage translation between different voltage domains - Fast-mode Plus I2C interface enables high-speed communication - Wide operating voltage range allows compatibility with various systems - 5 V tolerant I/Os simplify interfacing with higher voltage devices

Disadvantages: - Limited to I2C-bus/SMBus interface, may not be suitable for applications requiring other communication protocols - Latch-up performance may limit usage in high-current applications

Working Principles

The PCAL6416AEVJ operates as a GPIO expander by communicating with a host microcontroller or system through the I2C-bus/SMBus interface. The microcontroller sends commands and data to the IC, configuring its GPIO pins as inputs or outputs and controlling their states.

When an interrupt event occurs on any of the input pins, the PCAL6416AEVJ pulls the INT pin low, signaling the microcontroller to respond accordingly. The active LOW reset input allows the IC to be reset, restoring all GPIO pins to their default states.

The IC's low-voltage translation capability ensures seamless communication between devices operating