Microchip Technology QTM300CA

Overview

QTM300CA from Microchip Technology is a dedicated cloning adapter for QT3xx-family QProx™ capacitive touch sensor ICs (QT300, QT310, QT320), enabling PC-based configuration upload, real-time SPI signal data download (for QT300), and stand-alone cloning via on-board EEPROM. It interfaces via RS232, accepts 8–20 V DC power, and connects directly to E3A/E3B evaluation board headers.

For engineers reviewing the QTM300CA datasheet, QTM300CA pinout, QTM300CA application, or QTM300CA equivalent, key selection considerations include RS232 host interface compatibility, QT3xx-family-specific header mapping (E3A/E3B), 1-second clone cycle time, on-board EEPROM for offline operation, and QT300-specific SPI data streaming capability.

Technical Context

The QTM300CA implements a bidirectional serial bridge between a Windows PC (via RS232) and QT3xx ICs using a proprietary protocol over a 10-pin cloning cable. It supports both setup upload and verification, with hardware-level tolerance for arbitrary power sequencing between adapter and target.

For QT300 devices only, the QTM300CA exposes the IC's native SPI port to the host PC, enabling real-time acquisition of raw sensor signal data - a function not available for QT310 or QT320. The on-board EEPROM stores up to one complete configuration set for autonomous cloning without host connection.

Key Specifications

Availability

QTM300CA is available at Aetrix Electronics and suitable for production-line programming, engineering debug of QT3xx touch sensors, and factory calibration requiring stable component supply and repeatable configuration transfer.

Supply support for QTM300CA 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

Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog, interface, and touch-sensing solutions for industrial, automotive, and consumer applications.

The QTM300CA belongs to Microchip's QProx™ ecosystem and was designed specifically to accelerate development and deployment of QT3xx capacitive touch sensor designs through reliable, low-overhead configuration management.

FAQ

What is the primary function of the QTM300CA?

The QTM300CA is a dedicated cloning adapter that enables engineers to upload configuration settings from a Windows PC to QT3xx-family QProx™ touch sensor ICs (QT300, QT310, QT320). It also supports configuration verification and, for the QT300 specifically, real-time SPI signal data streaming. The QTM300CA operates with or without PC connection once programmed into its on-board EEPROM.

Which QT3xx devices is the QTM300CA compatible with?

The QTM300CA is explicitly designed for the QT300, QT310, and QT320 ICs. It connects to the QT300 via the E3A evaluation board header and to the QT310/QT320 via the E3B header. Pinout, protocol, and voltage levels are matched per device family - the QTM300CA is not compatible with non-QT3xx QProx™ parts or later-generation Microchip touch controllers.

Does the QTM300CA require external power, and what are the requirements?

Yes, the QTM300CA requires an external 8–20 V DC power source delivered via its screw-terminal block. A 9 V battery (with snap connector included) is recommended for portable use, but voltage must remain above 8 V to prevent erroneous operation. Power must be low-noise and stable - switching regulators or heavily loaded supplies may interfere with reliable cloning or SPI streaming on the QTM300CA.

Can the QTM300CA operate without a PC after initial setup?

Yes. The QTM300CA contains on-board EEPROM that stores one complete configuration set. Once programmed via PC using QT3View software, it functions as a stand-alone cloning tool - no host PC, serial cable, or software is needed during production-line programming. The QTM300CA retains this stored setup across power cycles.

What software is required to use the QTM300CA?

The QTM300CA is designed for use with Microchip's QT3View PC software, which runs on Windows 98 through Windows XP (and later via compatibility mode). QT3View provides GUI-based configuration editing, upload/download, verification, and - for the QT300 - real-time SPI waveform display. While customer-developed software can interface with the QTM300CA using documented protocol commands, QT3View remains the only officially supported and validated application.