Monolithic Power Systems Inc. EVKT-LT-KNOB

Overview

EVKT-LT-KNOB from Monolithic Power Systems is a plastic magnetic knob accessory with an integrated N35 diametrically magnetized cylinder magnet (Br ≈ 1.2 T), designed exclusively for mechanical coupling to TBMAxxx-Q-LT-xxx MagAlpha sensor evaluation boards. It delivers 80 mT field strength at the sensor's sensitive point and features 45° spaced rotational markings for visual position indication during real-time angular sensing validation.

For engineers reviewing the EVKT-LT-KNOB datasheet, EVKT-LT-KNOB mounting procedure, EVKT-LT-KNOB compatibility with MagAlpha sensors, or EVKT-LT-KNOB integration with TBMA-LT boards, this page provides verified mechanical interface details, magnetic performance data, assembly steps, and system-level evaluation context - all confirmed against the official MPS User Guide Rev. 1.0 (Sep 2021).

Technical Context

The EVKT-LT-KNOB functions as a calibrated mechanical input device that couples rotational motion to MPS MagAlpha magnetic angle sensors via precise air-gap-coupled flux transfer. Its diametrically magnetized N35 cylinder (Ø5 mm × 2.5 mm) is positioned to align with the sensor die on TBMAxxx-Q-LT-xxx boards, delivering a stable 80 mT field at the sensing location.

It is mechanically secured using a removable O-ring and bottom cap assembly, enabling repeatable, tool-free attachment to the long-format TBMA-LT board. The knob is incompatible with TBMA-RD round boards and requires MACOM GUI software (Windows-only) and EVKT-MACOM communication kit for full system evaluation.

Key Specifications

Availability

EVKT-LT-KNOB is available at Aetrix Electronics and suitable for MagAlpha sensor evaluation, industrial rotary interface prototyping, and educational angular position sensing labs requiring stable component supply and rapid test setup.

Supply support for EVKT-LT-KNOB 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management and sensing solutions, with global design and support infrastructure.

EVKT-LT-KNOB belongs to MPS's MagAlpha evaluation ecosystem - a purpose-built suite of hardware accessories and software tools designed to accelerate development and validation of contactless magnetic angle sensing applications.

FAQ

Is EVKT-LT-KNOB compatible with TBMA-RD evaluation boards?

No. The EVKT-LT-KNOB is mechanically designed only for TBMAxxx-Q-LT-xxx long-format boards. Its mounting geometry, O-ring interface, and PCB stop depth are incompatible with the circular TBMA-RD form factor. Attempting installation may damage the board or knob.

What magnet grade and orientation does EVKT-LT-KNOB use?

It uses an N35-grade neodymium cylinder magnet (Ø5 mm × 2.5 mm), diametrically magnetized - meaning north and south poles lie on opposite sides of the cylinder diameter. This orientation generates the precise rotating dipole field required by MagAlpha sensors for accurate angle measurement.

How is the 80 mT field strength validated?

The 80 mT value is measured at the sensor die location on TBMAxxx-Q-LT-xxx boards when the knob is fully assembled per MPS mounting instructions. It reflects the peak field magnitude delivered under nominal air gap and alignment - critical for ensuring MagAlpha devices operate within their specified magnetic input range.

Does EVKT-LT-KNOB require firmware or calibration?

No. The knob is a passive mechanical/magnetic component with no electronics, firmware, or user calibration. It functions solely as a field source; all signal processing and angle computation occur in the MagAlpha sensor and MACOM GUI software.

Can EVKT-LT-KNOB be used with non-MPS magnetic sensors?

MPS does not validate or guarantee performance with third-party sensors. While the 80 mT field and diametric orientation may suit some generic Hall or AMR sensors, field uniformity, temperature drift, and mechanical tolerances are optimized specifically for MagAlpha devices on TBMA-LT boards.

Where can I download the MACOM GUI software?

The MACOM GUI is hosted on the official MPS website under the MagAlpha product page resources section. It is a Windows-only desktop application and requires EVKT-MACOM communication hardware to interface with TBMA-LT boards and the EVKT-LT-KNOB.