Texas Instruments TMAG5328EVM User manual

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
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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
1
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 [phone]. 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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Table 4-1. Header Names and Jumper Settings (continued)
Header Name Type Main Functionality Valid Use-Cases
J3 3-pin jumper header Threshold Adjustment Option
Selection
• Place a jumper between the
"ADJ" (pin 2) and "DAC"
(pin 1) positions to use the
DAC to set the BOP . Make
sure that resistor R7 is not
populated. See Section 4.1.1
for more details.
• Place a jumper between the
"ADJ" (pin 2) and "APOT"
(pin 3) positions to use the
potentiometer to set the BOP .
Make sure that resistor R7
is not populated. See Section
4.1.2 for more details.
• To set the BOP using a fixed
resistor, remove the jumper
on this pin so that no jumper
is populated. Add a resistor
to R7 based on the desired
BOP. This resistor should be
between 2 kΩ to 15 kΩ
See Section 4.1.3 for more
details.
• To set the BOP using
an external voltage source,
remove the jumper on this
pin so that no jumper is
populated and also make
sure that resistor R7 is
not populated. The external
power supply should be
connected between the "ADJ"
(pin 2) pin and GND. The
applied voltage should be
between 0.16 V to 1.2 V. In
addition, the voltage source
must be able to sink 80 μA of
current within 4 μs for proper
operation.
J4 3-pin header Probe here for TVCC and GND. Probe here for TVCC (pin 1)
and GND (pin 3). If a jumper
is pressed on J2, TVCC is
connected to VCC on the board.
To power the TMAG5328 from
an external power supply that is
independent of VCC, remove the
jumper header on J2 and connect
the external bench power supply
between TVCC and GND.
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5 EVM Operation
The EVM can be evaluated using two options. The first option involves using the SCB and GUI. The second
option involves using the TMAG5328EVM without the SCB and GUI so that the TMAG5328EVM operates as
a stand-alone board. For both of these options, the Head-on module (Section 5.3) can be used to facilitate
magnetic testing.
5.1 Evaluation With SCB and GUI
To use the EVM with the included SCB, connect the EVM as shown in Figure 5-1.
Figure 5-1. Sensor Control Board Connected to TMAG5328EVM
5.1.1 Driver Installation
Before using the SCB, download and install this driver: http://www.ti.com/lit/zip/sbac253. This is a one-time step
per computer. Unzip the folder and run the .exe file with administrator privileges.
5.1.2 Firmware
The firmware comes pre-installed on the SCB. The latest version of the firmware can be downloaded from: . It
can also be downloaded onto the SCB from the GUI.
5.1.2.1 Updating Firmware on SCB
If the firmware gets corrupted or must be manually reinstalled for any reason, follow these steps to reinstall the
firmware.
1. Configure the MCU on the SCB to be in Device Firmware Update (DFU) Mode. DFU mode can be entered
manually through one of the following methods while the SCB is powered on:
a. Through software:
• Send the command "bsl" on the SCB's USB Serial (COM) port.
b. Though hardware (with the EVM removed):
• Short the two test points labeled DFU (see Figure 5-2) with a pair of tweezers (or wire) while pressing
the RESET button. If this is done correctly, LED D1 on the SCB should turn OFF while LED D5 (the
power LED) is still ON. If LED D1 is still ON, the GUI firmware is still active and the device has not
entered DFU mode.
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Figure 5-2. Test Points Used to Enter DFU Mode Manually
2. With the MCU in DFU mode, the firmware can now be uploaded through one of the following methods:
a. Bootstrap Loader (BSL) scripter tool and batch file
i. Download the firmware package and BSL scripter tool from the EVM page, or use the link: https://
www.ti.com/lit/zip/sbac297
ii. Unzip the firmware folder and run the .bat file.
iii. Unplug the USB cable from the PC after the firmware is flashed, then plug the cable back in to reset
the SCB.
b. TMAG5328GUI
i. Go to the GUI menu bar and click File → Program Device
Figure 5-3. Program Device Option in Menu
ii. The below screen should pop up while the firmware is updating:
Figure 5-4. Firmware Update Screen
iii. After the firmware updates successfully, the GUI will reload itself.
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5.1.3 GUI Setup and Usage
Access the GUI in either the Google Chrome® or Firefox® browser by clicking the following link:
https://dev.ti.com/gallery/view/1471350/TMAG5328EVM_GUI/ver/1.0.0/. Clicking the link takes you to the
TMAG5328GUI home page tab. This page has links to the EVM block diagram, user's guide, data sheet,
schematic, and the E2E forum for asking questions.
5.1.3.1 Initial Setup
To set up the GUI the first time, follow these steps:
1. Make sure that the previously-mentioned driver was installed successfully to ensure that everything works
properly.
2. Plug the connected EVM and SCB unit to the PC and go to the GUI link provided earlier.
3. Click the GUI Composer application window to launch the GUI from the web browser.
• For first-time GUI Composer setup, follow the prompts to download the TI Cloud Agent and browser
extension shown in Figure 5-5. These prompts will appear after you close the README.md dialog.
Figure 5-5. TI Cloud Agent
4. Click the icon in the GUI Composer window to download the GUI offline (optional).
5.1.3.2 GUI Operation
To operate the GUI, follow these steps:
1. Connect to and launch the GUI as described in Section 5.1.3.1.
2. Close the README.md file page that pops up after the EVM connects to the GUI. The text near the
bottom-left hand corner of the GUI should read Hardware Connected.
Figure 5-6. Hardware Connected
a. If Hardware Connected does not show in the bottom-left hand corner of the GUI, check different
hardware COM ports under Options → Serial Port.
Figure 5-7. Change Serial Port
b. If the hardware still does not connect, make sure you are using the correct GUI and EVM combination.
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3. Click the Registers icon to open the Registers page (also available on the left-side menu). Note that the
"registers" listed are not registers on the TMAG5328 but are internal variables stored in the microcontroller
that are not directly used for EVM evaluation. These variables cannot be modified from the Registers page
and can be ignored.
Figure 5-8. Registers Page Icon
4. At the top of the Registers page, change “Auto Read” to “As fast as possible.”
The TMAG5328 also has a Results page for viewing the state of the TMAG5328 OUT pin and a Configuration
page for configuring the DAC. Both of these pages are described in the below sections.
5.1.3.2.1 GUI Results Page
Click the Results Data icon to view the Results page. This screen shows the state of the TMAG5328
OUT pin. Remember to set the "Auto Read" option on the Registers page to "As fast as possible" to view the
results on this pin (see Section 5.1.3.2).
Figure 5-9 shows an example plot of the OUT waveform. If the TMAG5328 OUT pin is at a high state (LED is
OFF), a "1" is displayed on the graph. If the pin is at a low state (LED is ON), a "0" is displayed on the graph.
The number of samples stored in the plot can be modified by adjusting the "1000" at the top of the screen with
the desired number of samples then clicking enter. In addition, the plot can be exported by clicking the SAVE
PLOT button.
Figure 5-9. TMAG5328 GUI Results Page
5.1.3.2.2 GUI DAC Configuration Page
The DAC on the EVM is configured using the DAC configuration page on the GUI. When configuring the DAC
using the EVM, ensure that the EVM is configured to set the BOP using the DAC (see Section 4.1.1). To go
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to the DAC configuration page on the GUI, click the Configuration icon . Figure 5-10 shows the DAC
configuration page.
Figure 5-10. TMAG5328 GUI DAC Configuration Page
•Modification Method Drop-Down Box: This drop-down box selects which method is used for setting the
DAC voltage after you click the CHANGE VALUE button. There are four modification methods offered in this
drop-down box:
–Voltage sweep Drop-Down Box Option: This method sweeps the DAC output voltage to find the sensed
magnetic flux density and then sets the BOP to this sensed magnetic flux density. It takes 20 seconds to
complete the voltage sweep operation. During this time, the buttons on this page are disabled and the
textbox says "Sweep started. Next update in 20 seconds". After 20 seconds has passed and the buttons
on this page have been enabled again, the status text box will say one of the following:
•If the operation is successful: "BOP updated to" followed by the sensed magnetic flux density value
(see Figure 5-10).
•If the operation was successful but the sensed magnetic flux density was greater than the
maximum 15-mT BOP supported by the device: "Magnetic Flux Density > 15 mT device maximum
Bop."
•If the operation was successful but the sensed magnetic flux density was less than the
minimum 2-mT BOP supported by the device: "Magnetic Flux Density < 2 mT device minimum
Bop."
•If the operation was not successful: "Sweep started. Next update in 20 seconds"
–Manual B Drop-Down Box Option: This allows the user to enter a magnetic flux density into the
"Implemented Magnetic Flux Density (BOP)" textbox. When you click the CHANGE VALUE button, the
DAC is configured to output the voltage needed to generate the BOP that was input into the "Implemented
Magnetic Flux Density (BOP)" textbox.
–Manual V Drop-Down Box Option: This allows the user to enter a DAC output voltage into the "Voltage
Applied to TMAG5328 ADJ Pin" textbox. When you click the CHANGE VALUE button, the DAC's output
voltage is set to the output voltage that was entered into the "Voltage Applied to TMAG5328 ADJ Pin"
textbox.
–Manual R Drop-Down Box Option: This setting simulates applying a resistor on the ADJ pin by applying
an equivalent DAC voltage that would create the same BOP as the input provided into the "Equivalent
Resistance to Apply on TMAG5328 ADJ Pin" textbox. Any resistors entered into this textbox are not
programmed into the DAC until you click the CHANGE VALUE button.
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• Textboxes
–Implemented Magnetic Flux Density (BOP) Textbox: Displays the TMAG5328 BOP value based on the
DAC settings. If the Modification Method drop-down box has the "Manual B" option selected, this textbox
is also used to enter the desired BOP to change to.
–Voltage Applied to TMAG5328 ADJ Pin Textbox: Displays the DAC output voltage. If the Modification
Method drop-down box has the "Manual V" option selected, this textbox is also used to enter the desired
DAC output voltage to change to.
–Equivalent Resistance to Apply on TMAG5328 ADJ Pin Textbox: Displays the resistor that can be
applied to the ADJ pin to produce the same BOP produced by the currently set DAC output voltage. If the
Modification Method drop-down box has the "Manual R" option selected, this textbox is also used to enter
the desired equivalent resistance value to change to.
–Status Textbox: This displays the status associated with pressing different action buttons.
• Action Buttons
–CHANGE VALUE button: When you click this button, the DAC output voltage is changed according to the
selected option in the "Modification Method" Drop-Down Box.
–STORE TO NVM button: Pressing this button stores the current DAC output voltage to nonvolatile
memory. If the EVM is power cycled, the DAC will be automatically set to the last output voltage stored
in nonvolatile memory without requiring the microcontroller performing any reconfigurations steps on the
DAC. As a result, the BOP also would be retained after the power cycle.
–RELOAD FROM NVM button: Sets the current DAC output voltage to the DAC output voltage that is
stored in nonvolatile memory.
5.1.4 Direct EVM Serial Communication
If desired, the SCB can communicate directly with the EVM without the use of the GUI through the USB serial
(COM) port. Simply send the desired command string over the serial port and receive the results. This is useful
for interfacing the EVM with custom setups/scripts/GUIs. Note that the TMAG5328EVM has to be connected to
the SCB to receive any command responses from the SCB.
The following commands are supported:
• Results Read command format: rreg 0
– This command reads the state of the TMAG5328 OUT pin. If the pin is asserted high (the LED is OFF),
the value returned is 1. If the pin is asserted low (the LED is ON), the value returned is 0.
–Figure 5-11 is an example response to the command. In this response, the TMAG5328 OUT pin is at a
logic high since the returned value is 1 and not 0.
Figure 5-11. Example Result Read Command Response
• DAC Sweep command format: dacweep
– This command initiates a DAC voltage sweep. This is the same command executed by the GUI whenever
you click the CHANGE VALUE button while the "Modification Method" drop-down box is set to the
"Voltage Sweep" option.
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–Figure 5-12 an example response to this command, where the first two lines are sent immediately while
the third line is sent sometime within 20 seconds after the command was received. The number on the
third line represents the new BOP setting in units of μT.
Figure 5-12. Example DAC Sweep Command Response
• Set BOP command format: wreg 2 VAL
– This command allows you to enter a desired BOP. This is the same command executed by the GUI
whenever you click the CHANGE VALUE button while the "Modification Method" drop-down box is set to
the "Manual B" option.
– VAL is the desired BOP in units of μT.
– VAL is in hex, and wreg is always lower case
– VAL can be in upper or lower case and does not need to be led by "0x". 0 padding VAL is also optional.
For example, to write a BOP of 8000 μT, some valid commands include:
• wreg 2 1F40
• wreg 2 0x1F40
– When "0x" is used, the "x" must be lower case.
–Figure 5-13 is an example response to this command
Figure 5-13. Example Set BOP Command Response
• Set DAC Output Voltage command format: wreg 1 VAL
– This command allows you to enter a desired output voltage to set the DAC to. This is the same command
executed by the GUI whenever you click the CHANGE VALUE button while the "Modification Method"
drop-down box is set to the "Manual V" option.
– VAL is the desired DAC output voltage in units of mV.
– VAL is in hex, and wreg is always lower case
– VAL can be in uppercase or lowercase and does not need to be led by "0x". 0 padding VAL is also
optional. For example, to set a DAC output voltage of 397 mV, some valid commands include:
• wreg 1 190
• wreg 1 0x190
– When "0x" is used, the "x" must be lower case.
–Figure 5-14 is an example response to this command
Figure 5-14. Example Set DAC Output Voltage Command Response
• Set Equivalent Resistance command format: wreg 3 VAL
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– This command allows you to configure the DAC output to create the same BOP that would be generated
by the input resistance. This is the same command executed by the GUI whenever you click the CHANGE
VALUE button while the "Modification Method" drop-down box is set to the "Manual R" option.
– VAL is the desired equivalent resistance value in units of Ω.
– VAL is in hex, and wreg is always lower case
– VAL can be in upper or lower case and does not need to be led by "0x". 0 padding VAL is also optional.
For example, to configure the DAC output to produce the same BOP that would be created if a 9000-Ω
resistor was connected to the ADJ pin instead of the DAC, some valid commands include:
• wreg 2 2328
• wreg 1 0x2328
– When "0x" is used, the "x" must be lower case.
–Figure 5-15 is an example response to this command
Figure 5-15. Example Set Equivalent Resistance Command Response
• Store to Nonvolatile Memory command: storenvm
– This command stores the current DAC output into nonvolatile memory. After power cycling the EVM,
the DAC output voltage will automatically be initiated to the value stored in nonvolatile memory, thereby
ensuring the same BOP value is used after power cycling the EVM. This is the same command executed
by the GUI whenever you click the STORE TO NVM button.
–Figure 5-16 is an example response to this command:
Figure 5-16. Example Store to Nonvolatile Memory Command Response
• Restore from Nonvolatile Memory command: reloadnvm
– This command sets the currently applied DAC output voltage to the voltage that is stored in nonvolatile
memory. This is the same command executed by the GUI whenever you click the RELOAD FROM NVM
button.
–Figure 5-17 is an example response to this command:
Figure 5-17. Example Restore from Nonvolatile Memory Command Response
• Firmware revision command format: id
– This command prints the EVM the SCB is configured for (TMAG5328EVM in this case) and the date
associated with the version of the firmware loaded on the SCB.
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–Figure 5-18 is an example response to this command:
Figure 5-18. Example Firmware Revision Command Response
• BSL command format: bsl
– This command puts the device in BSL mode, which is necessary before reflashing the SCB firmware. An
alternative to entering BSL mode is to do it in hardware as described in step 1b of Section 5.1.2.1. Before
BSL is entered, LED D1 is ON. If BSL mode is successfully entered, LED D1 is turned OFF so that only
the Power LED (LED D5) is on. After entering BSL mode, the device does not accept any of the above
commands.
–Figure 5-19 shows an example response to this command:
Figure 5-19. BSL Command Response
5.2 Evaluation Without SCB and GUI (EVM Stand-Alone Mode)
The TMAG5328EVM can operate in a stand-alone mode that does not require the SCB or GUI. To operate in
stand-alone mode, an external power supply must be connected to the TMAG5328EVM (see Section 4.2).
When in standby mode, BOP can be set using either the DAC, potentiometer, or fixed resistor options.
Remember that the DAC output voltage cannot be changed without the SCB. The DAC output voltage will
only be set to the value that was previously stored in its nonvolatile memory by the GUI. As a result, the DAC
cannot be swept to find the sensed magnetic flux density of the TMAG5328 unless the SCB is connected. The
potentiometer, however, does not require the SCB to estimate the sensed magnetic flux density TMAG5328 (see
Section 4.1.2.1).
When in stand-alone mode, the TMAG5328 OUT pin can be probed at the test point that is labeled "OUT" on the
board or on pin 9 of header J1. In addition, LED D1 can be used to visually observe the state of the TMAG5328
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