Model Information: PCAL6416AHF

General Description

The PCAL6416AHF is a 16-bit general-purpose I/O expander designed to provide remote I/O expansion for most microcontroller families via the I2C-bus interface. It features low-voltage translation capabilities and is ideal for applications requiring flexible GPIO expansion and voltage level shifting between different I/O voltages. The device supports a wide VDD range of 1.65V to 5.5V, making it suitable for interfacing with next-generation low-voltage microprocessors and microcontrollers.

Features and Benefits

• I2C-bus to Parallel Port Expansion: Provides 16-bit I/O expansion.
• Operating Voltage Range: 1.65V to 5.5V.
• Bidirectional Voltage-Level Translation: Supports various voltage combinations for SCL/SDA and Port P.
• Low Standby Current Consumption: 1.5μA typical at 5V VDD, 1.0μA typical at 3.3V VDD.
• Schmitt Trigger Action: Enhances noise immunity at SCL and SDA inputs.
• 5V Tolerant I/O Ports: Suitable for a wide range of applications.
• Active LOW Reset Input (RESET): Allows for easy system initialization.
• Open-Drain Active LOW Interrupt Output (INT): Provides interrupt signaling to the system master.
• Fast-mode I2C-bus (400kHz): Ensures efficient communication.
• Internal Power-On Reset: Initializes the device to a known state.
• Programmable Features: Includes output drive strength, input latching, pull-up/pull-down resistors, and interrupt masking.
• ESD Protection: Exceeds JESD 22 standards.

Applications

• Battery-Powered Mobile Applications: Ideal for interfacing with sensors, push buttons, and keypads.
• Industrial Equipment: Suitable for applications requiring mixed signal environments.
• Telecommunications: Provides reliable I/O expansion for various telecom applications.
• Consumer Electronics: Enhances functionality in devices requiring additional I/Os.

Ordering Information

• Package Type: HWQFN24 (plastic thermal enhanced very thin quad flat package; no leads; 24 terminals; body 4x4x0.75mm)
• Orderable Part Number: PCAL6416AHF,128
• Packing Method: Reel 13"
• Minimum Order Quantity: 6000
• Temperature Range: Tamb = -40°C to +85°C

Pin Configuration

Voltage Translation

The PCAL6416AHF supports various voltage combinations for the I2C-bus and Port P, including:

• 1.8V SCL/SDA with 1.8V, 2.5V, 3.3V, or 5V Port P
• 2.5V SCL/SDA with 1.8V, 2.5V, 3.3V, or 5V Port P
• 3.3V SCL/SDA with 1.8V, 2.5V, 3.3V, or 5V Port P
• 5V SCL/SDA with 1.8V, 2.5V, 3.3V, or 5V Port P

Functional Description

• Device Address: The address of the PCAL6416AHF is configured using the ADDR pin and is used in conjunction with the I2C-bus protocol.
• Interface Definition: The device communicates via the I2C-bus using the SCL and SDA lines.
• Pointer Register and Command Byte: The command byte determines which register pair is accessed during read/write operations.
• Register Descriptions: The device includes various register pairs for input port, output port, polarity inversion, configuration, output drive strength, input latch, pull-up/pull-down enable, pull-up/pull-down selection, interrupt mask, and interrupt status.

Power-On Reset

The PCAL6416AHF initializes to a known state upon power-up or when the RESET pin is asserted. The power-on reset ensures all registers and the I2C-bus state machine are set to their default states.

Interrupt Output

The INT pin is an open-drain output that signals the system master when an input state changes, indicating an interrupt condition.

Package Outline

• HWQFN24: Plastic thermal enhanced very thin quad flat package; no leads; 24 terminals; body 4x4x0.75mm.

Soldering Information

• Reflow Soldering: Suitable for reflow soldering processes. Follow the recommended temperature profiles and footprint guidelines provided in the datasheet.

Legal Information

• Limited Warranty and Liability: NXP Semiconductors provides no warranty for the information in this document and shall have no liability for its use.
• Right to Make Changes: NXP Semiconductors reserves the right to make changes to the specifications and product descriptions without notice.
• Export Control: The product and its documentation may be subject to export control regulations.