Overview
The PCAL6416AHF,128, produced by NXP USA Inc., 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. This device is particularly useful in scenarios where additional I/Os are required without increasing the complexity of interconnections. It is especially beneficial in battery-powered mobile applications for interfacing with sensors, push buttons, keypads, and other devices. The PCAL6416AHF,128 features built-in level shifting, allowing it to operate seamlessly in mixed signal environments where communication between different voltage levels is necessary.
Key Specifications
| Parameter | Description |
|---|---|
| Number of Bits | 16-bit |
| Interface | I2C-bus/SMBus |
| Supply Voltage Range | 1.65 V to 5.5 V (VDD(I2C-bus) and VDD(P)) |
| Package Types | TSSOP24, HWQFN24, VFBGA24, X2QFN24 |
| Reset Input | Active LOW reset input |
| Interrupt Output | Maskable interrupt with interrupt status register |
| Output Configuration | Programmable output drive strength, open-drain or push-pull outputs |
| Input Configuration | Latchable inputs, programmable pull-up/pull-down resistors |
Key Features
- Built-in level shifting for bidirectional voltage translation between VDD(I2C-bus) and VDD(P)
- Agile I/O features including programmable output drive strength, latchable inputs, and programmable pull-up/pull-down resistors
- Maskable interrupt with interrupt status register
- Programmable open-drain or push-pull outputs
- Polarity Inversion register to invert the polarity of the Input Port register
- Active LOW reset input for system reset
- Configuration, Input, Output, and Polarity Inversion registers for flexible I/O management
Applications
- Battery-powered mobile applications
- Interfacing with sensors, push buttons, and keypads
- Mixed signal environments requiring communication between different voltage levels
- Next-generation low-voltage microprocessors and microcontrollers
- Peripheral devices operating at higher voltages
Q & A
- What is the primary function of the PCAL6416AHF,128?
The primary function is to provide remote I/O expansion for most microcontroller families via the I2C-bus interface.
- What is the supply voltage range for the PCAL6416AHF,128?
The supply voltage range is from 1.65 V to 5.5 V for both VDD(I2C-bus) and VDD(P).
- What types of packages are available for the PCAL6416AHF,128?
The device is available in TSSOP24, HWQFN24, VFBGA24, and X2QFN24 packages.
- Does the PCAL6416AHF,128 support level shifting?
Yes, it supports bidirectional voltage level translation between VDD(I2C-bus) and VDD(P).
- What are the Agile I/O features of the PCAL6416AHF,128?
The Agile I/O features include programmable output drive strength, latchable inputs, and programmable pull-up/pull-down resistors.
- How does the reset input work on the PCAL6416AHF,128?
The reset input is an active LOW reset input that can be connected to VDD(I2C-bus) through a pull-up resistor if no active connection is used.
- Can the output configuration be programmed on the PCAL6416AHF,128?
Yes, the output configuration can be programmed to have open-drain or push-pull outputs with programmable drive strength.
- What is the purpose of the Polarity Inversion register?
The Polarity Inversion register allows the polarity of the Input Port register to be inverted, saving external logic gates.
- How does the interrupt system work on the PCAL6416AHF,128?
The device has a maskable interrupt with an interrupt status register, allowing for better management of interrupt events.
- What happens to the I/Os at power-on?
At power-on, the I/Os are configured as inputs, and all I/O interrupts are masked by default to prevent spurious interrupts.
