Texas Instruments DRV5055EVM Manual de usuario

SLYU047A–April 2018–Revised May 2018

DRV5055EVM

User's Guide

SLYU047A–April 2018–Revised May 2018

DRV5055EVM

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).

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Contents

1 Overview...................................................................................................................... 3

2 Operation ..................................................................................................................... 4

3 Hardware...................................................................................................................... 5

4 Schematics, PCB Layout, and Bill of Materials.......................................................................... 8

List of Figures

1 Microcontroller Source Code Operation .................................................................................. 5

2 Schematic for DRV5055 Devices Gain Variants A1 to A4 (Right to Left)............................................ 8

3 Schematic of LCD for Measurement Display, Microcontroller for Data Processing, and Switch for

Expanding GPIO Functionality ............................................................................................ 9

4 Schematic of Push-Button User Input, Slider Switch User Input, and Programming Input....................... 10

5 Schematic of LED and Indicators and Slider Switch Status Reader ................................................ 11

6 Schematic of Supply Input and Power Conditioning................................................................... 11

7 Top Overlay................................................................................................................. 12

8 Top Layer ................................................................................................................... 12

9 Bottom Overlay............................................................................................................. 12

10 Bottom Layer................................................................................................................ 12

List of Tables

1 DRV5055 Device Summary................................................................................................ 3

2 Kit Contents .................................................................................................................. 3

3 Related Documentation..................................................................................................... 3

4 Bill of Materials ............................................................................................................. 13

Trademarks

All trademarks are the property of their respective owners.

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Overview

SLYU047A–April 2018–Revised May 2018

DRV5055EVM

1 Overview

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 VCC include: 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 1. DRV5055 Device Summary

Product Gain at 3.3V VCC

DRV5055A1 60 mV/mT

DRV5055A2 30 mV/mT

DRV5055A3 15 mV/mT

DRV5055A4 7.5 mV/mT

1.1 Kit Contents

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

Item Quantity

DRV5055EVM test board 1

Cylindrical magnet 1

USB cable 1

1.2 Related 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.

Table 3. Related Documentation

Document Title Document Literature

Number

DRV5055 data sheet SBAS640

DRV5055-Q1 data sheet SBAS639

SN74LVC1G17 data sheet SCES351

TCA9535 data sheet SCPS201

LP5907 data sheet SNVS798

TS5A23159 data sheet SCDS201

Operation

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2 Operation

2.1 Quick Start Setup

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).

2.2 Measurements

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).

Start Up

1. Set Up Microcontroller Registers

2. Calibrate Measurements

A: Number of Collected Samples < 32

B: Push-Button Pressed

C: 32 Samples Collected

Collect A2

Samples Collect A3

Samples

AAA A

B B

Display Measurement

and Check Measurement Mode

C C C

Collect A1

Samples Collect A4

Samples

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Hardware

SLYU047A–April 2018–Revised May 2018

DRV5055EVM

3 Hardware

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.

3.1 Features

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.

3.2 Theory 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.

Figure 1. Microcontroller Source Code Operation

Hardware

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3.3 Circuitry

This section summarizes the DRV5055EVM components.

3.3.1 C1, 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.

3.3.2 C2-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.

3.3.3 C8--C11, R3-R6

These components are used to form low-pass filters on the outputs of all of the DRV5055Aydevices,

where y= 1 to 4. The capacitors also allow the ADC input node to remain relatively stable throughout the

ADC sample transition.

3.3.4 J2

J2 is the male USB connector that allows the device to be powered through a PC USB port or USB

adapter.

3.3.5 K1, 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.

3.3.6 R16 and S1

R16 is a pullup resistor that ties push-button switch S1 to the 3.3-V VCC when S1 is not pushed.

3.3.7 C55, 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.

3.3.8 U9-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.

3.3.9 U16 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.

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SLYU047A–April 2018–Revised May 2018

DRV5055EVM

3.3.10 U17, R28-R34, R40-R42, D13-D16

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-kΩresistors 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.

3.3.11 U19

U19 is the VI-401-DP-RC-S LCD that displays the measurements of a selected device for a given selected

measurement format.

3.3.12 M1, 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.

3.3.13 U21

U21 is a switch that serves as a GPIO extender to provide on additional pin with a voltage signal suitable

for the LCD.

VCC VCC VCC VCC

GND GND GNDGND

55A1 55A2

55A3 55A4

16V

1uF

16V

1uF

16V

1uF

16V

1uF

GNDGND

GND GND

100

35V

1.5uF

35V

1.5uF

35V

1.5uF

C10

35V

1.5uF

C11

TP2

DNP

TP3

DNP

TP4

DNP

TP5

DNP

VCC

1OUT 3

GND 2

PDRV5055A1ELPGQ1

U12

VCC

1OUT 3

GND 2

PDRV5055A2ELPGQ1

U11

VCC

1OUT 3

GND 2

PDRV5055A3ELPGQ1

U10

VCC

1OUT 3

GND 2

PDRV5055A4ELPGQ1

Schematics, PCB Layout, and Bill of Materials

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DRV5055EVM

4 Schematics, PCB Layout, and Bill of Materials

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.

4.1 Schematics

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)

VCC

56A1

56A2

56A3

56A4

55A1

55A2

55A3

55A4

GND

TEST

RST

1B P7.5/L5 1

P7.4/L4 2

P7.3/L3 3

P7.2/L2 4

P7.1/L1 5

P7.0/L0 6

P4.7/R13 7

P4.6/R23 8

P4.5/R33 9

P4.4/LCDCAP1 10

P4.3/LCDCAP0 11

P4.2/XOUT 12

P4.1/XIN 13

DVSS 14

DVCC

RST/NMI/SBWTDIO 16

TEST/SBWTCK 17

P4.0/TA1.1 18

P8.3/TA1.2 19

P8.2/TA1CLK 20

P1.7/TA0.1/TDO/A7

21 P1.6/TA0.2/TDI/TCLK/A6

22 P1.5/TA0CLK/TMS/A5

23 P1.4/MCLK/TCK/A4/VREF+

24 P1.3/UCA0STE/A3

25 P1.2/UCA0CLK/A2

26 P1.1/UCA0RXD/UCA0SOMI/A1/Veref+

27 P1.0/UCA0TXD/UCA0SIMO/A0/Veref-

P5.5/L37

29 P5.4/L36

30 P5.3/UCB0SOMI/UCB0SCL/L35

31 P5.2/UCB0SIMO/UCB0SDA/L34

32 P5.1/UCB0CLK/L33

33 P5.0/UCB0STE/L32

P2.7/L31

35 P2.6/L30

36 P2.5/L29

37 P2.4/L28

38 P2.3/L27

39 P2.2/L26

40 P2.1/L25

41 P2.0/L24

P6.5/L21

43 P6.4/L20

44 P6.3/L19

45 P6.2/L18

46 P6.1/L17

47 P6.0/L16

P3.7/L15 49

P3.6/L14 50

P3.5/L13 51

P3.4/L12 52

P3.3/L11 53

P3.2/L10 54

P3.1/L9 55

P3.0/L8 56

MSP430FR4133IG56R

BUTTON

DP3

COM

10V

0.1uF

C39

10V

0.1uF

C40

GND GND

GND

10V

0.1uF

C41

GND

SDA

SCL

COM1

DP3

DP2

DP1

20 1A 21

1F 22

1G 23

2B 24

3G 32

NC 33

4B 34

4A 35

4F 36

4G 37

NC 38

2A 25

2F 26

2G 27

L28

3B 29

3A 30

3F 31

NC 39

COM1 40

U19

VI-401-DP-RC-S

DP3

DP2

DP1

COM

10µF

C29

10V

0.1uF

C42

VCC

DP0

10V

0.1uF

C43

IN1

1NO1 2

GND 3

NO2 4

IN2

COM2

6NC2 7

V+

NC1 9

COM1

TS5A23159DGSR

U21

GND

COM

DP2

DP1

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Schematics, PCB Layout, and Bill of Materials

SLYU047A–April 2018–Revised May 2018

DRV5055EVM

Figure 3. Schematic of LCD for Measurement Display, Microcontroller for Data Processing, and Switch for Expanding GPIO Functionality

VCC

RST

TEST

BUTTON

VCC

GND

10.0k

R16

10V

0.1uF

C32

GND

VCC

SN74LVC1G17DCKT

U14A

VCC

5GND 3

U14B

PCT_FS

VOLT

S1 S1

10.0k

R47

10.0k

R48

10.0k

R49

GND

VCC

2200pF

100

R51

35V

1.5uF

C44

GND GND

47k

Schematics, PCB Layout, and Bill of Materials

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Figure 4. Schematic of Push-Button User Input, Slider Switch User Input, and Programming Input

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