Texas Instruments TMAG5328EVM Manuale utente

User’s Guide

TMAG5328 Evaluation Module

ABSTRACT

This user’s guide describes the characteristics, operation, and use of the TMAG5328 evaluation module (EVM).

This EVM is designed to evaluate the performance of the TMAG5328. Throughout this document, the terms

evaluation board, evaluation module, and EVM are synonymous with the TMAG5328EVM. This document

includes a schematic, reference printed circuit board (PCB) layouts, and a complete bill of materials (BOM).

Table of Contents

1 Overview..................................................................................................................................................................................2

1.1 Features............................................................................................................................................................................. 3

2 Kit Contents.............................................................................................................................................................................4

3 Related Documentation From Texas Instruments............................................................................................................... 4

4 Hardware................................................................................................................................................................................. 5

4.1 EVM Threshold Adjustment Options.................................................................................................................................. 5

4.2 Power Supply Options and Jumper Settings......................................................................................................................9

5 EVM Operation...................................................................................................................................................................... 12

5.1 Evaluation With SCB and GUI......................................................................................................................................... 12

5.2 Evaluation Without SCB and GUI (EVM Stand-Alone Mode).......................................................................................... 20

5.3 Head-On Linear Displacement Demo.............................................................................................................................. 21

6 Schematics, PCB Layout, and Bill of Materials................................................................................................................. 23

6.1 Schematics.......................................................................................................................................................................24

6.2 PCB Layout...................................................................................................................................................................... 25

6.3 Bill of Materials.................................................................................................................................................................29

Trademarks

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All trademarks are the property of their respective owners.

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1 Overview

The TMAG5328 is a resistor-adjustable device where the internal magnetic threshold sensitivity (BOP) varies

with the value of the external resistor connected to the “ADJ” pin of the device. When the applied magnetic flux

density exceeds the BOP threshold, the device outputs a low voltage. The output stays low until the flux density

decreases to less than the release point (BRP), then the output drives a high voltage. The BOP is selectable to be

anywhere between the 2-mT to 15-mT range. This device allows designing a platform of systems with multiple

sensitives with only one Hall sensor, thereby reducing device inventory management and facilitating prototyping

by enabling BOP adjustment after assembly. As an alternative to setting the BOP directly with a resistor, the BOP

can also be set by directly applying a voltage on the ADJ pin, assuming that the voltage source can properly sink

the current generated internally on the ADJ pin.

The TMAG5328EVM is an easy-to-use platform for evaluating the performance of the TMAG5328. This EVM

supports adjusting the BOP using four options: a fixed resistor, a potentiometer for creating an adjustable

resistance, the DAC43701 DAC for creating an adjustable voltage, or an external voltage source. Figure 1-1

shows the EVM.

Figure 1-1. TMAG5328 Evaluation Module

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. The EVM consists of

two PCBs. The smaller PCB is referred to as the EVM, and has the TMAG5328 device installed. The larger PCB

is referred to as the Sensor Control Board (SCB), and is used to interface the EVM with the GUI.

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1.1 Features

This EVM includes the following features:

• Supports multiple options for setting BOP

– GUI-controlled DAC (requires Sensor Controller Board for initialization)

• Sets voltage on TMAG5328 ADJ pin to create desired BOP

• Enables dynamically changing BOP by changing DAC output voltage

• Nonvolatile memory on DAC can store DAC output voltage setting to support future operation without

GUI or Sensor Controller Board

– Potentiometer

• Sets resistance on TMAG5328 ADJ pin to create desired BOP

• Enables dynamically changing BOP by adjusting potentiometer position

– Resistor footprint for creating a static BOP

– External voltage supply

• LED on TMAG5328 output for visual inspection of switch’s output state

• Flexible TMAG5328 power supply options

– 3.3-V rail from Sensor Controller Board: Enables evaluation without external power supply

– External power supply: TMAG5328 powered independently from Sensor Controller Board, which enables

testing the TMAG5328 at other voltages than 3.3 V

• 3D-printed magnetic attachment included in kit for facilitating magnetic testing

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2 Kit Contents

Table 2-1 lists the contents of the EVM kit. Contact the nearest Texas Instruments Product Information Center if

any component is missing.

Table 2-1. Kit Contents

ITEM QUANTITY

TMAG5328EVM 1

Sensor Controller Board (SCB) 1

Handheld magnet 1

USB cable 1

Head-on Linear Displacement 3D print

module

3 Related Documentation From Texas Instruments

This user's guide is available from the TI website under literature number SBAU376. 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 3-1 lists documentation related to the EVM. Click the links in Table 3-1 for

further information. The device name links to the product web folder on www.ti.com. The literature number links

to the document PDF.

Table 3-1. Related Documentation

DOCUMENT TITLE

DOCUMENT LITERATURE

NUMBER

TMAG5328 data sheet SLYS044

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4 Hardware

Figure 4-1 shows a schematic snippet of the TMAG5328 portion of the TMAG5328EVM. The EVM supports

adjusting BOP with three on-board options: a GUI-controlled DAC, a potentiometer, or a fixed resistor. The

different BOP options are selected based on the configuration of resistor R7 and header J3 in Figure 4-1. The

EVM also has other headers and test points for further configuring the EVM.

Figure 4-1. Schematic Snippet of TMAG5328 Portion of TMAG5328EVM

4.1 EVM Threshold Adjustment Options

4.1.1 Adjusting Threshold With DAC

One option for setting the BOP of the TMAG5328 is to use the onboard DAC43701 DAC to output a voltage

on the TMAG5328 ADJ pin. The DAC43701 is an 8-bit voltage-output DAC with nonvolatile memory and I2C

interface. The nonvolatile memory retains the set values in the absence of a power supply. As a result, if the

DAC output settings are stored in the nonvolatile memory of the DAC, a microcontroller does not need to

reconfigure the DAC after each reset. The DAC43701 can set the BOP of the TMAG5328 without using the SCB

afterward if the desired DAC output voltage was previously stored in the nonvolatile memory of the device. The

SCB and GUI will only be needed for the initial programming of the DAC voltage and the storing of this voltage

into nonvolatile memory.

The DAC43701 also has an internal reference option feature that is used in the TMAG5328EVM. By using the

internal reference, the output voltage of the DAC would not change drastically across power supply voltage as

long as the power supply voltage for the DAC43701 is anywhere within the recommended 1.8-V to 5.5-V range.

Use Equation 1 to translate the voltage on the ADJ pin into the BOP setting:

BOP= 0.0125 × ADJ voltage (1)

where:

• BOP is in units of mT

• ADJ voltage is in units of mV

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As an example, if 680 mV is applied to the ADJ pin, the BOP will be set to 8.5 mT.

The TMAG5328 ADJ pin can accept a voltage from 0.16 V to 1.2 V. To stay within this voltage range, the GUI

ensures that the DAC output voltage cannot be set outside of the 0.16-V to 1.2-V range.

The GUI allows setting the DAC voltage based on the following options:

•The magnetic flux density currently sensed by the TMAG5328: For this option, the DAC determines the

sensed magnetic flux density by sweeping the voltage on the ADJ pin from 1.2 V (15 mT) to 0.16 V (2

mT) and then finding the first DAC code that causes the output of the TMAG5328 to assert low. This first

DAC code is converted back into the corresponding DAC output voltage and then the corresponding BOP

using the equation above. If the TMAG5328 is asserted low after applying 1.2 V to the ADJ pin, the sensed

magnetic flux density is greater than the maximum 15-mT BOP supported by the device. If the TMAG5328 is

still asserted high even after applying 0.16 V to the ADJ pin, the sensed magnetic flux density is less than the

minimum 2-mT BOP supported by the device.

• Manually inputting one of the parameters below (the GUI only enables one of these parameters at a time):

–Desired BOP

–Desired voltage on the ADJ pin

–ADJ equivalent resistance: This setting simulates applying a resistor on the ADJ pin by applying a

voltage that would create the same BOP as the input resistance.

The GUI also calculates an equivalent resistance value based on the DAC output voltage. The equivalent

resistance value is the resistance value for the fixed-resistor threshold adjustment option that would generate the

same BOP as the currently set DAC output voltage. The equivalent resistance calculation allows the GUI to use

the DAC to precisely determine the required ADJ resistance value that would be needed in a final system that

does not have a DAC.

Figure 4-2 shows a schematic snippet of the DAC43701 portion of the TMAG5328EVM. The schematic snippet

below is also compatible with the DAC43701, which is the 10-bit version of the DAC43701. In addition, the

snippet is also compatible with the TPL1401, which is an 8-bit digital potentiometer device.

To select the DAC option for setting BOP, the DAC output must be connected to the ADJ pin, which is done by

the following steps:

• Do not populate resistor R7.

• Connect a jumper between the "DAC" (pin 1) and "ADJ" (pin 2) pins of header J3.

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Figure 4-2. Schematic Snippet of DAC43701 Portion of TMAG5328EVM

4.1.2 Adjusting Threshold With Potentiometer

The BOP of the TMAG5328 can also be set with the analog potentiometer that is on the EVM. To select the

potentiometer option for setting BOP, the potentiometer must be connected to the ADJ pin, which is done by the

following steps:

• Do not populate resistor R7.

• Connect a jumper between the "APOT" (pin 3) and "ADJ" (pin 2) pins of header J3.

Use Equation 2 to translate the resistance between its ADJ and GND pins into the BOP setting:

BOP= ADJresistance (2)

where:

• BOP is in units of mT

• ADJ resistance is in units of kΩ

As an example, if the resistance between ADJ and GND is 8.5 kΩ, the BOP will be set to 8.5 mT.

Figure 4-3 shows the schematic snippet for the potentiometer portion of the EVM. This circuit consists of a 10-kΩ

potentiometer (R13) in series with a 4.3-kΩ fixed resistor (R2). When the potentiometer is used for setting the

BOP, the ADJ pin sees a resistance equal to the sum of resistances R2 and R13. As a result, the ADJ pin would

see a resistance somewhere between 4.3 kΩ to 14.3 kΩ, depending on the position of the potentiometer. The

4.3-kΩ to 14.3-kΩ resistance range corresponds to a BOP of 4.3 mT to 14.3 mT. A 10-kΩ potentiometer is used,

therefore the potentiometer only simultaneously covers a 10-mT range of BOP settings. The resistor R2 can be

modified, however, to select which BOP options are supported. As an example, if you want to support a 2-mT to

12-mT range, you can replace R2 with a 2-kΩ resistor. Similarly, if you want to support a 5-mT to 15-mT range,

you can replace R2 with a 5-kΩ resistor.

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Figure 4-3. Schematic Snippet of Potentiometer Portion of TMAG5328EVM

Turning the potentiometer counterclockwise increases the resistance. Figure 4-4 and Figure 4-5 show the

potentiometer positions that correspond to an ADJ resistance of 4.3kΩ and 14.3 kΩ, respectively.

Figure 4-4. Potentiometer Position for Creating 4.3-kΩ ADJ Resistance

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Figure 4-5. Potentiometer Position for Creating 14.3-kΩ ADJ Resistance

4.1.2.1 Using the Potentiometer to Estimate the Magnetic Flux Density Sensed by the TMAG5328

Similar to sweeping the DAC output voltage to find the sensed magnetic flux density, an estimate of the sensed

magnetic flux density can also be found by sweeping the potentiometer resistance by adjusting its position. In

this approach, the potentiometer is placed to create the maximum resistance (Figure 4-5). If the TMAG5328's

output is not asserted high (LED is OFF) for this potentiometer position, replace R2 with a 5kΩ resistor. If the

output is still not asserted high after replacing R2, then the sensed magnetic flux density is greater than the

15mT maximum magnetic flux density that can be sensed by the TMAG5328.

If the TMAG5328's output does in fact get asserted high when the maximum resistance is applied to the ADJ pin,

slowly turn the potentiometer clockwise until the output of the TMAG5328 first gets asserted low (LED is ON).

As soon as the output gets asserted low, stop turning the potentiometer. The resistance between the ADJ pin

and GND pin can then be measured and entered into the equation above to determine the TMAG5328's sensed

magnetic flux density. If the potentiometer has been fully turned clockwise (Figure 4-4) and the output still does

not get asserted low, replace R2 with a 2kΩ resistor. If the output is still not asserted low after replacing R2, then

the sensed magnetic flux density is less than the 2mT minimum magnetic flux density that is able to be sensed

by the TMAG5328.

Since the potentiometer isn't affected by power resets, the potentiometer ensures that the same BOP is used

after a power reset, assuming that its position is not moved. As a result, the potentiometer option can be used

regardless if the SCB board is connected to it or not. If the potentiometer's position is accidentally changed,

however, the BOP will change. To ensure that the BOP doesn't change, one option is to measure the resistance

between the ADJ pin and GND pin and then use this resistor with the fixed-resistor threshold adjustment option.

When making these resistance measurements, please make sure to do the resistance measurement when the

system is not powered.

4.1.3 Adjusting Threshold With Fixed Resistor

Another option for setting BOP is to place a resistor on footprint R7 (see Figure 4-1). The R7 resistance is the

resistance seen between the ADJ and GND pin of the TMAG5328. You must select a resistance within the 2-kΩ

to 15-kΩ range.

If you select the fixed resistor option for setting BOP, remove the jumper on J3 so that the DAC, potentiometer or

anything else that is not connected to the ADJ pin.

4.2 Power Supply Options and Jumper Settings

The TMAG5328 in this EVM can be powered from either the main power rail on the board, which is labeled

as VCC on the board, or it can be powered from an external power supply that is independent of the board's

main power rail. To power the TMAG5328 from the VCC rail, add a jumper on pins 1 and 2 of header J2. By

adding the jumper to J2, the TMAG5328 is powered from the same power supply as the DAC43701. If the SCB

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is connected to the TMAG5328EVM, the SCB provides 3.3 V on VCC, so an external power supply should not

be connected to VCC in this scenario. If the SCB is not connected to the TMAG5328EVM, however, VCC can be

connected to an external power supply by connecting the external power supply between the VCC and GND test

points. In this scenario, the external power supply voltage must be set to somewhere within 1.8 V to 5.5 V, which

is within the normal power supply voltage range of both the DAC43701 and TMAG5328.

To power the TMAG5328 from an external power supply that is independent of the board's main power rail,

remove the jumper on J2 and connect J4 Pin 1 (labeled TVCC on the board) to the positive terminal of a power

supply and then connect the board's ground to the negative terminal of the power supply. This configuration

enables powering the TMAG5328 from a different power supply than the DAC and the SCB. The TMAG5328

power supply voltage should be set to be within 1.65 V to 5.5 V, which is the normal power supply voltage range

of the TMAG5328.

Various jumper headers and jumper settings are present to add to the flexibility to the board. Some of these

headers require that jumpers be placed appropriately for the board to correctly function. Table 4-1 shows the

functionality of each header on the board.

Table 4-1. Header Names and Jumper Settings

Header Name Type Main Functionality Valid Use-Cases

J1 2 x 6 pin header Connection to SCB To connect the TMAG5328EVM

to the SCB, connect this male

header to the female J1 header

on the SCB. The pin mappings on

this header include the following

(even pins are on the top row and

odd pins are on the bottom row):

• Pin 4: GND

• Pin 6: VCC (3.3 V provided

by SCB)

• Pin 9: TMAG5328 Output

• Pin 10: DAC43701 SCL I2C

communication signal

• Pin 11: Not used

• Pin 12: DAC43701 SDA I2C

communication signal

J2 2-pin jumper header PWR: TMAG5328 power select • Place a jumper here to power

the TMAG5328's power rail,

which is labeled on the EVM

as TVCC, to the VCC rail on

the board.

• If you want to power

the TMAG5328 from an

external power supply that

is independent of the DAC

and SCB, remove the jumper

here and connect the external

power supply between J4

Pin 1 and GND. This option

allows testing the TMAG5328

at voltages other than the 3.3

V provided by the SCB.

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