ST STEVAL-LVLP01 Manual de usuario

Introduction

The STEVAL-LVLP01 evaluation board is based on the STDRIVE101 three-phase gate driver and the STL8N10F7 power

MOSFETs.

The STEVAL-LVLP01 embeds a power stage and circuitry for driving three-phase brushless DC motors. The board can be

interfaced with different control boards based on STM32 microcontrollers through the MC Connector V2, which is a part of motor

control development platform supporting ZeST and HSO Algorithms.

The STEVAL-LVLP01 can support single-shunt or three-shunt operation. The different connectors for onboard motor positioning

feedback and motor phase sensing network allow implementation of sensor and sensorless algorithms for motion control.

Figure 1. STEVAL-LVLP01 evaluation board

Getting started with the STEVAL-LVLP01 evaluation board

UM3193

User manual

UM3193 - Rev 1 - October 2023

For further information contact your local STMicroelectronics sales office. www.st.com

1 Hardware description and configuration

The main components and connectors of the STEVAL-LVLP01 are shown in the figure and tables below.

Figure 2. STEVAL-LVLP01 main components and connectors

Table 1. STEVAL-LVLP01 configuration jumpers

Ref. Label Description Default

J1 SCREF Allows to short the SCREF pin of the STDRIVE101 to 3.3V, thus disabling

the VDS monitoring protection (see VDS monitoring protection).

Open (VDS protection

enabled)

J2 Allows to short the CP pin of the STDRIVE101 to GND, thus disabling the

overcurrent protection (see Overcurrent comparator).

Open (OC protection

enabled)

J4 CURR

REF IN

Allows to select the reference for the current control comparator (see

Comparator for current control). The reference signal can be provided

externally, by removing the jumper or directly from the CURR_REF signal

Jumper on CURR_REF

signal

J5 Selects the supply of the motor’s Hall sensors, whether 5 V or 3.3 V (see

Hall sensor connector)Jumper on 5V selection

J8 Selects the supply of the motor’s encoder, whether 5 V or 3.3 V (see Digital

encoder connector)Jumper on 5V selection

J10 Selects the supply of the Serial Peripheral Interface (SPI), whether 5 V or 3.3

V (see SPI connector)Jumper on 5V selection

SB1 and

SB2

Solder bridges to configure the shunt topology: three-shunt or single shunt

configuration (see Shunt resistor configuration)3-shunt configuration

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Hardware description and configuration

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Table 2. STEVAL-LVLP01 connectors

Ref. Pin Label Description

V1 Phase 1 (U) of the three-phase motor.

V2 Phase 2 (V) of the three-phase motor.

V3 Phase 3 (W) of the three-phase motor.

J7 + (VM) Main power supply of the power MOSFETs and the STDRIVE101. It ranges from 6V to 45V.

- (GND) Reference ground terminal (negative pole) of the main power supply.

H1 Motor’s Hall sensor signal 1 (digital signal).

H2 Motor’s Hall sensor signal 2 (digital signal).

H3 Motor’s Hall sensor signal 3 (digital signal).

VHall Motor’s Hall sensors supply voltage (selectable by J5).

GND GND reference for the motor’s Hall sensors.

A Motor’s encoder out A+ (digital signal).

B Motor’s encoder out B+ (digital signal).

Z Motor’s encoder zero feedback (digital signal).

Venc Motor’s encoder supply voltage (selectable by J8).

GND GND reference for the motor’s encoder.

J11

nSS SPI interface: Chip Select / Slave select (active low).

MISO SPI interface: Master Input Slave Output

MOSI SPI interface: Master Output Slave Input

SCLK SPI interface: Serial clock

VSPI SPI interface supply voltage (selectable by J10).

GND GND reference for the SPI interface.

Table 3. STEVAL-LVLP01 test points

Ref. Label Description

TP1 REG12 Test point connected to the REG12 pin of the STDRIVE101; it is the output of the embedded linear regulator

and the supply of the gate drivers.

TP2 VM Voltage supply of the motor and the STDRIVE101. TP2 is placed next to the STDRIVE101.

TP3 nFAULT Test point connected to the nFAULT pin of the STDRIVE101. This pin indicates a failure condition detected by

the device.

TP4 CP Test point connected to the CP pin of the STDRIVE101. It is the input of the embedded comparator used for

overcurrent protection

TP5 GND Power GND. Close to the power stage.

TP6 PH_1 Voltage of the phase V1 (U) of the motor, rescaled and filtered.

TP7 PH_2 Voltage of the phase V2 (V) of the motor, rescaled and filtered.

TP8 PH_3 Voltage of the phase V3 (W) of the motor, rescaled and filtered.

TP9 I1 Amplified signal related to the current flowing in the phase V1 of the motor.

TP10 OPREF Reference voltage provided to the operational amplifiers.

TP11 I2 Amplified signal related to the current flowing in the phase V2 of the motor.

TP12 CFBK Amplified signal used by the comparator implementing the current control (Comparator for current control).

TP13 I3 Amplified signal related to the current flowing in the phase V3 of the motor.

TP14 CREF Reference signal used to set the current threshold of the current control (Comparator for current control).

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Hardware description and configuration

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Ref. Label Description

TP15 5V 5 V output of the DC/DC Buck converter. 5 V supply is used to supply the control board connected to the MC

connector V2.

TP16 GND Signal ground, reference for the DC/DC and the MC connector V2. The control board is referred to this GND.

TP17 PG Power good indicator of the DC/DC Buck converter.

TP18 VM Voltage supply of the motor and the STDRIVE101. TP2 is placed next to the main power connector J7.

TP19 VBUS Bus voltage VM rescaled and filtered.

TP20 GND Power GND. Close to the main power connector J7.

TP21 TPCB Temperature signal measured by the NTC resistor.

1.1 MC connector V2

The Motor Control connector V2 is used to connect a compatible control board to the STEVAL-LVLP01. The

insertion slot of this 164-pin edge-card connector presents two rows of contacts: the row on the bottom has an

“A”, and the row on top has a “B” (see Figure 3) at the beginning and the end of the pin numbering sequence.

The signal mapping is reported in Table 4, which indicates:

• The category of the pin according to the functional block associated

• The direction of the signal, whether from the power board STEVAL-LVLP01 to the control board (P → C) or

vice-versa (P → C)

• The description of the signal function

The pins of the connector not reported in Table 4 can be associated to other functions or signals present on the

control board, but are unused by the STEVAL-LVLP01.

Figure 3. MC connector V2 footprint and pin numbering (top view)

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MC connector V2

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Table 4. Pin mapping of the MC connector V2

Pin No. Category Direction Signal Name Description

A01

SPI

C → P SPI_nSS nSS signal generated by the SPI peripheral (Master) on the control board.

B01 P → C SPI_MISO MISO signal generated by the slave device connected to J11 on the STEVAL-LVLP01.

A02 C → P SPI_SCK Serial clock signal generated by the SPI peripheral (Master) on the control board.

B02 C → P SPI_MOSI MOSI signal generated by the SPI peripheral (Master) on the control board.

A05

Power

P → C 5V + 5V Supply voltage generated by the DC/DC converter on the STEVAL-LVLP01

B05

A06 C → P VDD +3.3V Supply voltage generated on the control board.

B06 -- VREF+ Reference voltage for the analog circuitry

A07 -- GND Reference GND

B07

A08 Board ID C → P ID ENABLE

Selects the analog signal to be sent on TEMP/ID pin (A28):

Set to 0: board ID

Set to 1: temperature sensor

B08 Power -- GND Reference GND

A12

Motor Feedback P → C nFAULT

STDRIVE101 fault indicator (active low): connection to BKIN input of the timer.

B12 STDRIVE101 fault indicator (active low): connection to BKIN2 input of the timer

(default).

A13

Motor control

C → P INH1 INH1/IN1 control Signal for the half bridge 1 (see Working mode selection).

B13 C → P INL1 INL1/EN1 control Signal for the half bridge 1 (see Working mode selection).

A14 C → P INH2 INH2/IN2 control Signal for the half bridge 2 (see Working mode selection).

B14 C → P INL2 INL2/EN2 control Signal for the half bridge 2 (see Working mode selection).

A15 C → P INH3 INH3/IN3 control Signal for the half bridge 3 (see Working mode selection).

B15 C → P INL3 INL3/EN3 control Signal for the half bridge 3 (see Working mode selection).

B16

Motor Feedback

P → C ENCA A+ signal from the motor digital encoder

A17 P → C ETR ETR signal from the current control comparator (see Comparator for current control).

B17 P → C ENCB B+ signal from the motor digital encoder

A18 P → C H1 Hall sensor 1 digital signal

B18 P → C ENCZ Zero feedback signal from the motor digital encoder

A19 P → C H2 Hall sensor 2 digital signal

B19 P → C H3 Hall sensor 3 digital signal

A20 Power -- GND Reference GND

B20

A21

Motor Feedback

P → C ISNS1P Current sensing signal (positive) related to motor’s phase 1 (U) (see Operational

amplifiers).

B21 P → C ISNS1N Current sensing signal (negative) related to motor’s phase 1 (U) (see Operational

amplifiers).

A22 P → C ISNS2P Current sensing signal (positive) related to motor’s phase 2 (V) (see Operational

amplifiers).

B22 P → C ISNS2N Current sensing signal (negative) related to motor’s phase 2 (V) (see Operational

amplifiers).

A23 P → C ISNS3P Current sensing signal (positive) related to motor’s phase 3 (W) (see Operational

amplifiers).

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MC connector V2

UM3193 - Rev 1 page 5/33

Pin No. Category Direction Signal Name Description

B23 Motor Feedback P → C ISNS3N Current sensing signal (negative) related to motor’s phase 3 (W) (see Operational

amplifiers).

A24 Power -- GND Reference GND

B24

A25

Motor Feedback

P → C VSNS1 Voltage of the motor’s phase 1 (U) rescaled and filtered.

B25 -- GND Reference GND

A26 P → C VSNS2 Voltage of the motor’s phase 2 (V) rescaled and filtered.

B26 -- GND Reference GND

A27 P → C VSNS3 Voltage of the motor’s phase 3 (W) rescaled and filtered.

B27 -- GND Reference GND

A28 P → C TEMP/ID Analog signal representing the board ID or the temperature (see Temperature sensor

and board ID).

B28 Motor control C → P CURR_REF Reference signal used to set the current control (see Comparator for current control).

A29 Motor Feedback P → C VBUS Power stage bus voltage (VM) rescaled and filtered

A31

Power -- GND Reference GND

B31

A32

B32

A45

B45

A49

B49

A56

B56

A65

B65

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MC connector V2

UM3193 - Rev 1 page 6/33

1.2 Getting started

Table 5 summarizes the maximum ratings of the STEVAL-LVLP01. To run the motor follows the points below:

Step 1. Plug a compatible control board in the MC Connector V2 (J12), programmed with the target firmware

Step 2. Connect a power supply (voltage between 6V and 45V) to J7, taking care to connect the positive pole

to VM pin and the negative one to GND pin (see Figure 2)

Step 3. Connect the three-phase brushless motor to J3 taking care of the motor phase sequence

Step 4. In case motor sensors are needed (disregard this point if the application does not require them):

Step 4a. Select which supply to use for the Hall sensors using J5 and connect the Hall sensors and

their supply to J6

Step 4b. Select which supply to use for the encoder using J8 and connect the encoder and its supply

to J9

Step 5. Power up the voltage supply connected to J7 and start the application.

Table 5. STEVAL-LVLP01 operative conditions

Parameter Value

Supply voltage Nominal From 6 V to 45 V

Maximum phase current Continuous(1) 5 Arms

Peak (OC protection enabled – J2 open) 20 Amax

1. Actual maximum current could be limited by power dissipation

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Getting started

UM3193 - Rev 1 page 7/33

2 Hardware and functional blocks description

The STEVAL-LVLP01 is based on the STDRIVE101 three-phase gate driver. The power stage is based on six N-

channel STL8N10F7 power MOSFETs in the 3.3 x 3.3 powerFLAT package. The digital control signals and the

feedback signals are routed on the MC connector V2, which acts as interface for the control board.

The STEVAL-LVLP01 can be configured in single-shunt or three-shunt and it can support FOC, six-step, ZeST,

and HSO algorithms. Each part of the Figure 4 block diagram is described in the following sections.

Figure 4. STEVAL-LVLP01 block diagram

2.1 DC-DC buck converter

The ST1S14 is a DC/DC buck converter present on the STEVAL-LVLP01, which generates a 5 V output, starting

from the motor supply VM provided on J7. The external components are sized in order to guarantee a maximum

current capability of 1.5 A. The 5 V voltage is brought on the MC connector V2, in order to provide the supply the

microcontroller present on the control board. The step down from 5 V to 3.3 V is usually done by a linear

regulator. The 5 V can also supply the motor sensors connected to the STEVAL-LVLP01 (see Motor position

feedback interfaces)

If needed, the extended current capability of the DC/DC allows the user to connect other external loads, in

addition to the other circuitries mentioned above. The 5 V voltage provided by the DC/DC is present on the test

point TP15; a “Power Good” signal present on TP17 indicates whether the 5V is ok or there are some issues in

regulation. Moreover, the “power good” is also indicated by the LED2 (green).

2.2 Current sensing

This section describes how the STEVAL-LVLP01 performs the current sensing, flowing in each phase of the

motor. The current sensing is a critical point because most of the motion control algorithms are based on this

information.

2.2.1 Shunt resistor configuration

The STEVAL-LVLP01 can be used in both three-shunt or single shunt configurations. By default, the board is

configured in three-shunt configuration. Every phase has a shunt resistor of 15 mΩ. It is possible to change from

three-shunt to single shunt, by changing the configuration of the solder bridges SB1 and SB2 as shown in

Figure 5 and Figure 6.

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Hardware and functional blocks description

UM3193 - Rev 1 page 8/33

Figure 5. Solder bridges configuration for three-shunt operation

Figure 6. Solder bridges configuration for single shunt operation

In case of single shunt operation (Figure 6) the solder bridges redirect the current of the three phases to flow in

the shunt resistor of the phase 2 (R26); the readout of the current must be performed on the ISNS2P and ISNS2N

signal; A22 and B22 pins of the MC connector V2, respectively.

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Current sensing

UM3193 - Rev 1 page 9/33

2.2.2 Operational amplifiers

By default, the shunt resistors are directly connected to the MC connector V2: the amplification can be done

exploiting the operational amplifiers embedded in the microcontroller on the control board. However, it is possible

to change this configuration and use the operational amplifiers present on the STEVAL-LVLP01. The signal of

each shunt resistor has a dedicated op-amp, which implements a differential amplifier with a gain of 15. The

topology used enables the rejection of the common mode, resulting in a more accurate output signal. There is the

possibility to add a RC low pass filter at the output of each op-amp; by default, no filter is mounted. The TSV994

mounted on the STEVAL-LVLP01 embeds the three operational amplifiers (one for each shunt), together with a

fourth op-amp used for current control (see Comparator for current control).

By configuring the 0-Ohm resistors/solder bridges as reported in Table 6, the raw signal coming from the shunt

resistor is amplified before sending it the MC connector V2.

Figure 7. Shunt and op-amp connections by solder bridges / 0-ohm resistors

Table 6. Configuration for the shunt resistors amplification

Shunt resistor Direct to MC conn. V2 (default) To op-amp and then to MC connector V2

R25 (Phase 1) R43, R54 mounted/closed

R46, R49 open

R43, R54 open

R46, R49 mounted/closed

R26 (Phase 2) R62, R71 mounted/closed

R65, R69 open

R62, R71 open

R65, R69 mounted/closed

R27 (Phase 3) R79, R88 mounted/closed

R83, R86 open

R79, R88 open

R83, R86 mounted/closed

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Current sensing

UM3193 - Rev 1 page 10/33

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