TMAG5253EVM User's Guide
Abstract
This user’s guide describes the characteristics, operation, and use of the TMAG5253 evaluation module (EVM). This EVM is designed to evaluate the performance of the TMAG5253. Throughout this document, the terms evaluation board, evaluation module, and EVM are synonymous with the TMAG5253EVM. This document includes a schematic, reference printed circuit board (PCB) layouts, and a complete bill of materials (BOM).
Trademarks
All trademarks are the property of their respective owners.
1 Overview
The TMAG5253 is a low-power, linear Hall effect sensor with an enable pin. This device is available in multiple unipolar or bipolar sensitivity range variants. The enable pin allows the user to activate a < 10-nA sleep mode, and the fast start-up feature of the device allows the user to duty cycle the enable pin to lower the average power consumption.
| PRODUCT | SENSITIVITY RANGE |
|---|---|
| TMAG5253BA1IQDMRR | 100 mV/mT, ±21-mT Range |
1.1 Kit Contents
Table 1-2 lists the contents of the EVM kit. Contact the nearest Texas Instruments Product Information Center if any component is missing.
| ITEM | QUANTITY |
|---|---|
| TMAG5253EVM | 1 |
| 3D printed Trigger Assembly | 1 |
| Magnet | 1 |
Figure 1-1 shows the 3D printed Trigger Assembly with a trigger top, trigger base, torsion spring, and an aluminum axle rod.
Figure 1-1 Trigger Assembly Exploded View1.2 Related Documentation From Texas Instruments
This user's guide is available from the TI website under literature number SBAU400. Any letter appended to the literature number corresponds to the document revision that is current at the time of the writing of this document. Newer revisions are available from www.ti.com or the Texas Instruments' Literature Response Center at (800) 477-8924 or the Product Information Center at (972) 644-5580. When ordering, identify the document by both title and literature number. Table 1-3 lists the documentation related to the EVM. Click the links in Table 1-3 for further information. The device name links to the product web folder on www.ti.com. The literature number links to the document PDF.
2 Hardware
This EVM allows the user to evaluate the TMAG5253. The EVM includes a trigger attachment that controls the perceived brightness of an onboard RGB LED according to the analog output of the TMAG5253. The EVM is intended to provide basic functional evaluation of the devices. The layout is not intended to be a model for the target circuit, nor is it laid out for electromagnetic compatibility (EMC) testing.
2.1 Features
- LED indicator for visual feedback corresponding to an analog output.
- Receptacle for a CR-10-25 Coin Cell Battery to power the EVM.
- 3D CAD files available for modifying and customizing trigger design.
3 Operation
3.1 Quick Start Setup
The following instructions describe how to set up and use the EVM.
- Supply power to the device through one of these methods:
- Apply a 3.3-V potential (see Figure 3-1)
- Insert a CR1025 coin cell battery into the holder (see Figure 3-1)
- Toggle the enable switch on.
Figure 3-1 Powering On EVM
Figure 3-2 Enable TMAG52533.2 EVM Operation
While the TMAG5253 is available in either unipolar or bipolar configurations, the device featured in this EVM is a bipolar ratiometric device. The device output is an analog signal proportional to the field detected by the sensor. The output is routed to a header pin as well as a via which a test point or wire can be inserted into for inspection with an external voltmeter, oscilloscope, or microcontroller. The output is also routed to an onboard microcontroller that processes the analog potential and generates a PWM signal that can dim an RGB LED indicator to provide visual feedback to the user. If no LED light is on, the device is either disabled or there is little to no field measured. As in Figure 3-3, a bright red LED light indicates that the north pole is facing the top of the device sensing element, while a bright blue LED light, as in Figure 3-4, indicates that the south pole is facing the top of the device sensing element. When the board is inserted into the 3D attachment with the magnet installed, a little less than 50% of the analog output range will be observed over the trigger's range of motion according to the magnetic polarity facing the device.
Figure 3-3 Red LED Operation
Figure 3-4 Blue LED Operation