Overview
The PCAL6408AHK is a low-voltage translating, 8-bit I2C-bus/SMBus I/O expander produced by NXP USA Inc. This component is designed to provide remote I/O expansion for most microcontroller families via the I2C-bus interface. It is particularly useful in applications where additional I/Os are needed while minimizing interconnections, such as in battery-powered mobile devices, sensors, push buttons, and keypads.
Key Specifications
| Product Attribute | Attribute Value |
|---|---|
| Manufacturer | NXP Semiconductors |
| Package | Bulk |
| Base Product Number | PCAL6 |
| Operating Power Supply Voltage Range | 1.65 V to 5.5 V |
| Voltage-Level Translation | Bidirectional between 1.8 V, 2.5 V, 3.3 V, and 5 V |
| Standby Current Consumption | 1 μA |
| Interface | I2C-bus/SMBus |
| Interrupt Output | Yes, with maskable interrupt and interrupt status register |
| Reset | Yes, with power-on reset and external reset pin |
Key Features
- I2C-bus to parallel port expander
- Operating power supply voltage range of 1.65 V to 5.5 V
- Bidirectional voltage-level translation between different voltage levels (1.8 V, 2.5 V, 3.3 V, 5 V)
- Low standby current consumption of 1 μA
- Schmitt-trigger action for slow input transition and better switching noise immunity at SCL and SDA lines
- Programmable output drive strength, latchable inputs, and programmable pull-up/pull-down resistors
- Maskable interrupt, interrupt status register, and programmable open-drain or push-pull outputs
- Polarity inversion register to save external logic gates
Applications
- Battery-powered mobile devices
- Sensors and sensor interfaces
- Push buttons and keypads
- Mixed signal environments requiring communication between incompatible I/O voltages
- Any system needing additional I/O expansion with minimal interconnections
Q & A
- What is the primary function of the PCAL6408AHK?
The PCAL6408AHK is an 8-bit general-purpose I/O expander that provides remote I/O expansion via the I2C-bus interface.
- What is the operating power supply voltage range of the PCAL6408AHK?
The operating power supply voltage range is from 1.65 V to 5.5 V.
- Does the PCAL6408AHK support voltage-level translation?
Yes, it supports bidirectional voltage-level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V.
- What is the standby current consumption of the PCAL6408AHK?
The standby current consumption is 1 μA.
- Does the PCAL6408AHK have an interrupt output feature?
Yes, it has an interrupt output feature with maskable interrupt and interrupt status register.
- How can the PCAL6408AHK be reset?
The PCAL6408AHK can be reset using the power-on reset or the external reset pin.
- What are some of the programmable features of the PCAL6408AHK?
The PCAL6408AHK has programmable output drive strength, latchable inputs, and programmable pull-up/pull-down resistors.
- Can the polarity of the input port be inverted on the PCAL6408AHK?
Yes, the polarity of the input port can be inverted using the Polarity Inversion register.
- In what types of applications is the PCAL6408AHK commonly used?
The PCAL6408AHK is commonly used in battery-powered mobile devices, sensor interfaces, push buttons, keypads, and mixed signal environments.
- What is the benefit of using the PCAL6408AHK in mixed signal environments?
The PCAL6408AHK simplifies communication between incompatible I/O voltages, making it highly flexible in mixed signal environments.
