Texas Instruments DRV5055EVM User manual

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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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DRV5055EVM
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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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 [phone] or the Product Information Center at [phone]. 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

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DRV5055EVM
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
B
AAA A
B B
B
Display Measurement
and Check Measurement Mode
C
C C C
Collect A1
Samples Collect A4 Samples
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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

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DRV5055EVM
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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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
C2
16V
1uF
C3
16V
1uF
C4
16V
1uF
C5
GNDGND
GND GND
100
R3
100
R4
100
R5
100
R6
35V
1.5uF
C8
35V
1.5uF
C9
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
U9
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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
1C
1A
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
15
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-
28
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
34
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
42
P6.5/L21
43 P6.4/L20
44 P6.3/L19
45 P6.2/L18
46 P6.1/L17
47 P6.0/L16
48
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
M1
1E
2B
BUTTON
2A
2C
2F
2D
2G
2E
3B
3A
3C
3F
3D
3G
3E
4B
DP3
4A
4C
4F
4D
4G
4E
COM
10V
0.1uF
C39
10V
0.1uF
C40
GND GND
GND
10V
0.1uF
C41
GND
SDA
SCL
COM1
1
NC
2
NC
3
NC
4
4E
5
4D
6
4C
7
DP3
8
3E
9
3D
10
3C
11
DP2
12
2E
13
2D
14
2C
15
DP1
16
1E
17
1D
18
1C
19
1B
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
4C
4D
4E
DP2
3C
3D
3E
DP1
2C
2D
2E
1B
1C
1D
1E
COM
4G
4F
4A
4B
3G
3F
3A
3B
2G
2F
2A
2B
1G
1F
1A
COM
COM
1G
1D
1F
10µF
C29
10V
0.1uF
C42
VCC
DP0
DP0
10V
0.1uF
C43
IN1
1NO1 2
GND 3
NO2 4
IN2
5
COM2
6NC2 7
V+
8
NC1 9
COM1
10
TS5A23159DGSR
U21
GND
GND
COM
DP2
DP1
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Figure 3. Schematic of LCD for Measurement Display, Microcontroller for Data Processing, and Switch for Expanding GPIO Functionality

VCC
5 4 1 2 3
J1
RST
TEST
BUTTON
VCC
GND
10.0k
R16
10V
0.1uF
C32
GND
GND
VCC
S1
42
SN74LVC1G17DCKT
U14A
VCC
5GND 3
NC
1
U14B
PCT_FS
VOLT
MT
2 1 3 4
S1 S1
S2
S2
K1
10.0k
R47
10.0k
R48
10.0k
R49
GND
VCC
VCC
VCC
2200pF
C1
100
R51
35V
1.5uF
C44
GND GND
47k
R1
0
R2
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Figure 4. Schematic of Push-Button User Input, Slider Switch User Input, and Programming Input