Overview
The PCAL6416A is a 16-bit general-purpose I/O expander designed by NXP Semiconductors. It provides remote I/O expansion for various microcontroller families through the I²C-bus interface. This device is particularly useful in applications where additional I/Os are required without increasing the complexity of interconnections. It is especially beneficial in battery-powered mobile devices, sensors, push buttons, and keypads. The PCAL6416A features built-in level shifting, allowing seamless communication between different voltage levels, making it highly flexible in mixed-signal environments.
Key Specifications
| Specification | Value |
|---|---|
| Voltage Range (VDD) | 1.65 V to 5.5 V |
| Interface | I²C-bus/SMBus |
| Number of I/Os | 16-bit |
| Supply Voltages | VDD(I²C-bus) and VDD(P) |
| Operating Temperature | -40 °C to +85 °C |
| Package Options | TSSOP24, HWQFN24, VFBGA24, X2QFN24 (LGA) |
| ESD Protection | Human-Body Model (2000 V), Charged-Device Model (1000 V) |
| Latch-up Performance | Exceeds 100 mA per JESD 78, Class II |
| Output Drive Capability | 25 mA maximum |
Key Features
- Built-in level shifting for bidirectional voltage translation between VDD(I²C-bus) and VDD(P).
- Programmable pull-up and pull-down resistors to eliminate the need for discrete components.
- Interrupt output, reset, and configuration registers for flexible control.
- Polarity inversion of the Input Port register without external logic gates.
- No glitch on power-up and noise filter on SCL/SDA inputs.
- Latched outputs with 25 mA drive capability for directly driving LEDs.
Applications
- Battery-powered mobile devices.
- Sensors and sensor interfaces.
- Push buttons and keypads.
- Mixed-signal environments requiring voltage level translation.
- Any system needing remote I/O expansion via the I²C-bus interface.
Q & A
- What is the primary function of the PCAL6416A?
The PCAL6416A is a 16-bit general-purpose I/O expander that provides remote I/O expansion for microcontroller families via the I²C-bus interface. - What is the voltage range of the PCAL6416A?
The voltage range is from 1.65 V to 5.5 V. - What types of packages are available for the PCAL6416A?
The device is available in TSSOP24, HWQFN24, VFBGA24, and X2QFN24 (LGA) packages. - Does the PCAL6416A have built-in level shifting?
Yes, it has built-in level shifting for bidirectional voltage translation. - What is the maximum output drive capability of the PCAL6416A?
The maximum output drive capability is 25 mA. - What kind of ESD protection does the PCAL6416A offer?
The device offers ESD protection exceeding 2000 V Human-Body Model and 1000 V Charged-Device Model. - Can the PCAL6416A be reset?
Yes, the device can be reset by asserting a LOW in the RESET input. - What is the operating temperature range of the PCAL6416A?
The operating temperature range is from -40 °C to +85 °C. - Does the PCAL6416A have programmable pull-up and pull-down resistors?
Yes, it does. - What is the purpose of the interrupt output in the PCAL6416A?
The interrupt output is used to signal changes in the I/O states to the system master.
