SLYU055A January   2020  – November 2020 TMAG5124

 

  1. 1Trademarks
  2. 2Overview
    1. 2.1 TMAG5124EVM Kit Contents
    2. 2.2 Related Documentation From Texas Instruments
  3. 3Hardware
    1. 3.1 Features
  4. 4Quick Start
    1. 4.1 Option 1: Single 5-V Supply
    2. 4.2 Option 2: Separate VCC and 5-V Supply
    3. 4.3 Measurements
    4. 4.4 Standalone Measurements
  5. 5Circuitry
    1. 5.1 TMAG5124 Coupon Boards
    2. 5.2 Logic, Feedback, and Display
    3. 5.3 J5
  6. 6Schematic, PCB Layout, and Bill of Materials
    1. 6.1 Schematic
    2. 6.2 PCB Layout
    3. 6.3 Bill of Materials
  7. 7Revision History

2 Overview

The TMAG5124 is a family of 2-wire Hall Effect sensors designed for system challenges where current is needed as an operating signal in place of voltage. This is most commonly found in applications where the Hall sensor is located some distance from the microcontroller or processor that acts on the signal, and signal integrity is of concern.

When the applied magnetic flux density exceeds the magnetic operating point (BOP) threshold, the device output drives into a high or low current state, based on the device in use. When the magnetic flux density returns to a value below the magnetic release point (BRP), the device output returns itself into a high or low current state, based on the device in use. Table 2-1 lists device options.

Table 2-1 TMAG5124 Device Summary
DeviceBOP Sensitivity (typ.)Current (typ.), Low state

TMAG5124A1

4mT4 mA

TMAG5124B1

6mT4 mA

TMAG5124C1

10mT4 mA

TMAG5124D1

15mT4 mA

TMAG5124E1

4mT6 mA

TMAG5124F1

6mT6 mA

TMAG5124G1

10mT6 mA

TMAG5124H1

15mT6 mA

This evaluation module is populated with four Z-axis oriented, north pole sensitive, active low devices. Each device exhibits a different sensitivity, allowing each of the sensitivities to be tested for use in an application. These devices produce an active low signal of 5 mA – 6.9 mA when the BOP threshold is crossed, and a high signal of 12 mA – 15 mA when no magnet is present.

The device operates from a VCC range of 2.5V to 38V, and is available in a standard SOT-23 package.