This user’s guide describes the characteristics, operation, and use of the DRV5055 evaluation module
(EVM). This EVM is designed to evaluate the performance of the DRV5055 ratiometric, linear, Hall effect
sensors. Throughout this document, the terms evaluation board, evaluation module, and EVM are
synonymous with the DRV5055EVM. This document includes a schematic, reference printed circuit board
(PCB) layouts, and a complete bill of materials (BOM).
The DRV5055 family of linear Hall effect sensors sense magnetic fields ranging from 21 mT to 176 mT,
depending on device and supply voltage. For each device, four gains are available. For the DRV5055, the
gains at 3.3 V VCCinclude: 7.5 mV/mT, 15 mV/mT, 30 mV/mT, and 60 mV/mT. These devices operate
from a single 3-V to 5.5-V power supply, drawing a maximum of 10 mA of supply current. These devices
are currently available in a 3-pin SOT-23 or 3-pin TO-92 package. Table 1 lists available gain options.
Table 2 lists the contents of the DRV5055EVM kit. Contact the nearest Texas Instruments Product
Information Center if any component is missing. Click the links in Table 3 for further information on the
DRV5055. The device name links to the product web folder on www.ti.com. The literature number links to
the user's guide PDF.
Table 2. Kit Contents
ItemQuantity
DRV5055EVM test board1
Cylindrical magnet1
USB cable1
1.2Related Documentation From Texas Instruments
This EVM user's guide provides information regarding TI's integrated circuits used in the assembly of the
DRV5055EVM. This user's guide is available from the TI website under literature number SLYU047. 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 lists documentation related to
the DRV5055EVM.
The following instructions describe how to set up and use the DRV5055EVM.
Step 1.Insert the USB cable into the EVM onboard USB receptacle.
Step 2.For proper calibration, make certain that there are no magnets within a few feet of the EVM
when the EVM powers up.
Step 3.Plug the USB cable into any USB power adapter (for example, laptop, desktop, power bank,
and so on). LED D13 on the far bottom right of the board indicates the board is powered,
calibrated, and is taking sample measurements from the DRV5055A1 (default EVM startup
device).
2.2Measurements
The DRV5055EVM measures a magnetic field with multiple devices and the respective gain variants.
Push-button S1 selects the different gain variants of the DRV5055 devices. The devices are arranged
such that gain variants increase sequentially from right to left. The LCD displays the measurement
corresponding to the selected device. The measurement format is adjusted by the slide switch labeled
Display Mode (K1).
Step 1.Click the Device Select Switch until an LED indicates the device of interest is selected.
Step 2.Adjust the Display Mode slide switch to the measurement format of interest.
Step 3.Introduce magnetic stimulus (for example, the magnet included in the evaluation kit).
A: Number of Collected Samples < 32
B: Push-Button Pressed
C: 32 Samples Collected
Collect A2
Samples
Collect A3
Samples
B
A
A
AA
BB
B
Display Measurement
and Check Measurement Mode
C
CCC
Collect A1
Samples
Collect A4
Samples
www.ti.com
3Hardware
The DRV5055 is a linear Hall effect magnetic-sense solution that provides ease of use and high
performance. The DRV5055EVM is intended to provide basic functional evaluation of this device family.
The fixture layout is not intended to be a model for the target circuit, nor is it laid out for electromagnetic
compatibility (EMC) testing. The DRV5055EVM consists of one PCB with each of the gain variants of the
DRV5055. The EVM kit also provides a USB cable for quick power-up, as well as a magnet for quick
qualitative assessment of the DRV5055 variants performance.
3.1Features
The layout of the DRV5055EVM printed circuit board (PCB) is designed to provide the following features:
•Evaluation of all gain options for the DRV5055
•Easily access device pins through test points
•Easily read voltage, mT, and microcontroller ADC memory values from the onboard LCD
•Toggle between devices with a press of the Device Select Switch, push-button S1.
See the links in Table 3 for comprehensive information about the DRV5055 family of devices.
3.2Theory of Operation
The DRV5055EVM is a plug and play board, requiring only that the user supply power and provide a
magnetic stimulus after the initial calibration. The ease of operation can be attributed to the onboard
microcontroller. The source code for the microcontroller is available on the DRV5055 web folder under
Tools and Software. The basic operation of the microcontroller source code is outlined in the state
machine diagram shown in Figure 1. Upon receiving power, the microcontroller registers are set up to
properly interact with the other devices on the board. Then, a preliminary measurement of each DRV5055
gain variant is taken. It is imperative that the magnetic stimulus of interest is not present at this time, as
this measurement sets the 0 point in the mT measurement display. After calibration is complete, the LED
for the DRV5055A1 powers on by default. At this point, the EVM microcontroller begins continuously
sampling the DRV5055A1. Pressing push-button S1 results in the EVM sampling the next adjacent device.
After every 32 samples are taken, the device calculates an average, and processes the data to fit the
format selected by the slider switch K1.
This section summarizes the DRV5055EVM components.
3.3.1C1, J1, R1, and R2
J1 serves as the connector for an external MSP-FET Flash Emulation Tool to connect to the board.
C1, R1, and R2 are the additional passives required for the emulation tool to effectively communicate with
the MSP430FR4133 for the purposes of programming and debugging.
The MSPFETFlash can be obtained separately at http://www.ti.com/tool/MSP-FET. Alternatively, if an
MSP430FR4133 Launchpad is already available, that board can be configured to program the
DRV5055EVM microcontroller.
3.3.2C2-C5, C29, C32, C36, C43
C2-C5 are the 1-µF supply bypass capacitors for the DRV5055.
C29, C32, C36, and C43 are the supply bypass capacitors for the MSP430FR4133, SN74LVC1G17,
LP5907MFX-3.3, TCA9535, and TS5A23159, respectively.
3.3.3C8--C11, R3-R6
These components are used to form low-pass filters on the outputs of all of the DRV5055Ay devices,
where y = 1 to 4. The capacitors also allow the ADC input node to remain relatively stable throughout the
ADC sample transition.
www.ti.com
3.3.4J2
J2 is the male USB connector that allows the device to be powered through a PC USB port or USB
adapter.
3.3.5K1, R47, R48, R49
K1 serves as a slide switch that pulls GPIO extender TCA9535 GPIO pins P00, P01, and P02 either to
GND or to 3.3-V VCC through pullup resistors R47, R48, and R49.
3.3.6R16 and S1
R16 is a pullup resistor that ties push-button switch S1 to the 3.3-V VCC when S1 is not pushed.
3.3.7C55, R51, and U14
C55 and R51 form a low-pass filter with the push-button stimulus, and are used with SN74LVC1G17
Schmitt Trigger (U14) to mitigate the effects of debounce from the push-button.
3.3.8U9-U12
U9-U12 Correspond to each of the gain variants of the DRV5055 device. The gains are arranged highest
to lowest with U9 being the A4 variant while U12 is the A1 variant.
3.3.9U16 C33, C35, R19, R50
U16 is the LP590MFX-3.3 low dropout regulator (LDO) that converts the input voltage from the USB
power source to a stable 3.3 V.
U17 is the TCA9535 GPIO extender. The MSP430FR4133 and TCA9535 communicate through the I2C
protocol, which requires pullup resistors R32 and R33. The TCA9535 is the slave device, whereas the
MSP430FR4133 is the master device.
U16 communicates the K1 state on pins P00, P01, and P02 to the MSP430FR4133.
Pins P03-P07 and P10-P16 are defined as outputs for toggling LEDs D5-D16 according to commands
from the MSP430FR4133.
Resistors R28-R31 are 10-kΩ resistors meant to limit current through LEDs D13-D16 when a
corresponding TCA9535 output pin is toggled low.
Resistors R40-R43 are for power saving when any the corresponding TCA9535 output pin is high.
By default, TCA9535 GPIOs are all disabled and thus to enable these GPIOs the 10-kΩ, R34, ties pin 1 to
3.3-V VCC.
3.3.11U19
U19 is the VI-401-DP-RC-S LCD that displays the measurements of a selected device for a given selected
measurement format.
3.3.12M1, C49-C42
M1 is the MSP430FR4133 that samples the analog output from the DRV5055 and converts those outputs
into a bit pattern that conveys the correct output measurement on the LCD display. M1 uses capacitors
C49-C42 to convert the input voltage to a boosted square wave output signal capable of driving the LCD
display. M1 also gathers information from push-button S1, U17, the signal fed through U20, and signals
from U5-U12. M1 also commands U17 to turn on the LEDs of interest.
Hardware
3.3.13U21
U21 is a switch that serves as a GPIO extender to provide on additional pin with a voltage signal suitable
for the LCD.
NOTE: Board layouts are not to scale. These figures are intended to show how the board is laid out. The figures are not intended to be used for
manufacturing DRV5055EVM PCBs.
4.1Schematics
Figure 2 to Figure 6 show the schematic of the DRV5055EVM. Figure 2 pertains to DRV5055 devices that the DRV5055EVM is meant to demo.
Figure 3 shows the schematic of the microcontroller that does all the processing of the measurement data and user input, as well as the LCD that
the microcontroller drives. Figure 4 displays the circuitry for user inputs and programming inputs. Figure 5 corresponds to the GPIO extender used
for turning on the respective LED indicators and reading the status of the slider switch. Figure 6 is the schematic of the power stage used to
transform the 5-V USB input to a 3.3-V supply rail for all other onboard devices.
Figure 2. Schematic for DRV5055 Devices Gain Variants A1 to A4 (Right to Left)
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (April 2018) to A Revision .......................................................................................................... Page
•Changed front-page image from drawing to photo ................................................................................... 1
•Added row for magnet to Table 2 ....................................................................................................... 3
•Added two new rows to BOM table for designators H1 and H2 ................................................................... 13
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2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM
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3Regulatory Notices:
3.1 United States
3.1.1 Notice applicable to EVMs not FCC-Approved:
FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software
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software applications for use with the end product. This kit is not a finished product and when assembled may not be resold or
otherwise marketed unless all required FCC equipment authorizations are first obtained. Operation is subject to the condition
that this product not cause harmful interference to licensed radio stations and that this product accept harmful interference.
Unless the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must
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3.1.2 For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant:
CAUTION
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to
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FCC Interference Statement for Class A EVM devices
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to
correct the interference at his own expense.
FCC Interference Statement for Class B EVM devices
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more
of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
3.2 Canada
3.2.1 For EVMs issued with an Industry Canada Certificate of Conformance to RSS-210 or RSS-247
Concerning EVMs Including Radio Transmitters:
This device complies with Industry Canada license-exempt RSSs. Operation is subject to the following two conditions:
(1) this device may not cause interference, and (2) this device must accept any interference, including interference that may
cause undesired operation of the device.
Concernant les EVMs avec appareils radio:
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation
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Concerning EVMs Including Detachable Antennas:
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser)
gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type
and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for
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listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated.
Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited
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Concernant les EVMs avec antennes détachables
Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et
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by TI as conforming to Technical Regulations of Radio Law of Japan.
If User uses EVMs in Japan, not certified to Technical Regulations of Radio Law of Japan, User is required to follow the
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During normal operation, even with the inputs and outputs kept within the specified allowable ranges, some circuit
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