NXP Semiconductors TWR-IND-IO

Overview

TWR-IND-IO from NXP (formerly Freescale) is an industrial I/O peripheral module for the Tower System modular development platform, providing RS-232, RS-485 (with optional isolation and PROFIBUS support), dual CAN transceivers, 3-channel ADC, 1-channel DAC, 6× PWM, and 3× timer interfaces via screw terminals, headers, and jumpers.

For engineers reviewing the TWR-IND-IO datasheet, TWR-IND-IO pinout, TWR-IND-IO application, or TWR-IND-IO equivalent, this module supports rapid prototyping of industrial control systems requiring isolated serial communication, analog signal conditioning, and deterministic timing I/O on compatible Tower controller modules.

Technical Context

The TWR-IND-IO operates as a hardware expansion module-not a standalone IC-interfacing with Tower System controller boards via standardized mezzanine connectors. It routes MCU UART, CAN, ADC/DAC, and GPIO signals to industrial-grade physical layers including isolated RS-485 transceivers, dual CAN bus drivers, and screw-terminal analog I/O.

Signal routing is configurable via 21 discrete jumpers (e.g., J6 for 3.3V/5V I/O voltage selection, J13/J14 for CAN termination, J21 for RS-485 termination), enabling interface isolation, signal probing, and remapping without soldering. USB-to-serial bridge (USB2SER) provides direct host connectivity independent of the controller module.

Key Specifications

Availability

TWR-IND-IO is available at Aetrix Electronics and suitable for industrial automation prototyping, embedded control validation, and educational lab setups requiring stable component supply and long-term toolchain compatibility.

Supply support for TWR-IND-IO includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company formed from the spin-off of Freescale Semiconductor and Philips' semiconductor division, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The TWR-IND-IO belongs to NXP's Tower System ecosystem-a modular hardware platform designed to accelerate development of embedded applications using interchangeable controller and peripheral modules targeting industrial control, motor drive, and sensor interface use cases.

FAQ

What is the TWR-IND-IO and how does it integrate into the Tower System?

The TWR-IND-IO is an industrial I/O peripheral module that connects to Tower System controller boards (e.g., TWR-K60D100M, TWR-LPC1768) via standardized 100-pin mezzanine connectors. It extends the controller's capabilities with isolated RS-485, dual CAN, analog ADC/DAC, and PWM/timer I/O-all configurable via onboard jumpers. The TWR-IND-IO does not operate independently and requires a compatible Tower controller to function.

Does the TWR-IND-IO include built-in isolation for RS-485 and CAN interfaces?

The TWR-IND-IO provides optional isolation for RS-485 via dedicated screw terminals (J22/J23) supporting isolated power and signal paths, and includes jumper-selectable 121 Ω termination for both CAN1 and CAN2 (J13/J14). However, galvanic isolation components are not integrated on-board for CAN; external isolated transceivers or add-on modules are required for full CAN isolation. RS-485 isolation is implemented using discrete isolated transceiver circuitry per the module schematics.

Can the TWR-IND-IO be used without a Tower System controller module?

No-the TWR-IND-IO is not a standalone device and lacks onboard processing, power regulation, or firmware. It functions exclusively as a peripheral expansion module requiring connection to a Tower System controller (e.g., Kinetis, LPC, or i.MX-based modules) to provide clocking, MCU I/O routing, and power. The USB2SER interface enables host PC communication but does not replace the need for a controller during I/O operation.

Which software frameworks support the TWR-IND-IO out of the box?

The TWR-IND-IO is supported by NXP's MQX Real-Time Operating System with example projects that configure its ADC, DAC, PWM, and serial peripherals. Users adapt these by modifying user_config.h and recompiling the BSP. No native support exists for FreeRTOS or Zephyr without custom driver development; the TWR-IND-IO relies on low-level register access mapped through the connected Tower controller's SDK.

How do I configure RS-232 flow control and USB-to-serial bridging on the TWR-IND-IO?

RS-232 flow control is enabled by default via jumper J16 (UART3 TX/RX/RTS/CTS routed to J17 header); RTS/CTS loopback is configured using J18. USB-to-serial bridging uses the onboard USB2SER chip: J9 selects UART0 TX/RX routing, and J7 controls RTS/CTS loopback. All configurations are hardware-defined via jumpers-no firmware or driver configuration is needed for basic serial pass-through functionality of the TWR-IND-IO.