Texas Instruments DRV821 EVM Series Manual de usuario

User’s Guide

DRV821xEVM and DRV8220EVM User's Guide

ABSTRACT

This document is provided with the DRV82xx family customer evaluation modules (EVM) as a supplement to the

DRV8210, DRV8212, and DRV8220 data sheets. This user's guide describes the hardware implementation of

the EVM.

CAUTION

Hot surface. Contact may cause burns. Do not Touch.

DRV8210EVM and DRV8212EVM are rated for power supply voltages between 1.65 VDC and 11

VDC max. The DRV8210 can support peak output currents up to a maximum of 1.6 ADC and the

DRV8212 can support peak output currents up to a maximum of 4 ADC. To maintain component

temperatures below the 130°C rating of the printed circuit board material, TI requires that the

continuous current of both channels be limited to 0.9 A-RMS when operating for extended periods of

time at an ambient temperature of 25°C.

Table of Contents

1 Introduction.............................................................................................................................................................................3

2 Power Connectors.................................................................................................................................................................. 3

3 Test Points...............................................................................................................................................................................5

4 MODE/nSLEEP Jumper and Speed-Adjustment Potentiometers.......................................................................................6

4.1 PH/EN Control Mode (MODE=Logic High)........................................................................................................................ 7

4.2 PWM Control Mode (MODE = Logic High, DRL, PDSG)................................................................................................... 8

4.3 Independent Half-Bridge Control Mode (MODE=Hi-Z).......................................................................................................9

5 Current Sensing....................................................................................................................................................................10

6 Operation of the EVM............................................................................................................................................................11

6.1 Dual Motor Operation....................................................................................................................................................... 11

6.2 Single Motor Operation.................................................................................................................................................... 13

7 Removing and Installing Supported Motor Drivers...........................................................................................................14

8 Revision History................................................................................................................................................................... 15

Trademarks

MSP430™ and eZ-FET™ are trademarks of Texas Instruments.

All trademarks are the property of their respective owners.

www.ti.com Table of Contents

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DRV821xEVM and DRV8220EVM User's Guide 1

PCB (Top-Assembly View)

Figure 1-1. PCB (Top 3-D View)

Figure 1-2. PCB (Assembly View)

PCB (Top-Assembly View) www.ti.com

2DRV821xEVM and DRV8220EVM User's Guide SLOU540A – NOVEMBER 2020 – REVISED DECEMBER 2020

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1 Introduction

The DRV821x/8220EVM is a complete solution for evaluating the DRV821x/8220 H-bridge motor drivers. The

evaluation module (EVM) can support the DSG, PDSG, and DRL package variants of the DRV8210/12/20

devices. However, only one component can be populated at a time since the input control signals (EN/IN1 and

PH/IN2) are shared among the two components.

The EVM includes current sensing circuitry using a current sensing resistor and current sense amplifier (for

additional details about the current sensing see Section 3). The EVM includes an MSP430™ microcontroller that

is preprogrammed to take input from two dedicated analog potentiometers for PWM speed control of one or two

brushed DC motors. The jumper on the PMODE/nSLEEP pin (J2) allows the user to select the input control

mode or the sleep state of the driver depending on which component is populated on the EVM (further details

are provided in Section 2).

Power can be provided externally up to 11 V for the DRV8210/12 and 18V for the DRV8220 through the power

header. To expand beyond the included firmware capability, the MSP430 MCU can be reprogrammed through

the eZ-FET™ emulation circuit found in most MSP430 Launchpads. We recommend the MSP-EXP430FR5969.

Note that a four pin angled male header is required and must be soldered to J21 of this Launchpad from V+ pin

to GND pin. We recommend a pin header with pin dimensions similar to 850-10-050-20-001000 (Digikey part

number). The U1 MCU must be removed from the Launchpad.

2 Power Connectors

The DRV821x/8220EVM uses a single header for power entry to the EVM board. Only a single power supply rail

is necessary since an onboard 3.3-V regulator provides power to the MSP430. The minimum recommended VM

voltage for the EVM is 1.65 V and the maximum is 18 V. For complete voltage range information of the driver

itself, refer to the device.

As previously mentioned, the MSP430 comes preprogrammed to control basic DC motor operation. If changing

the firmware via the external eZ-FET™ emulation tool, do not supply power to the VM connector on the EVM.

The eZ-FET™ board provides the necessary power during programming when connected to the J6 connector.

Note that a four-pin angled male header is required and must be soldered to J21 of this Launchpad from V+ pin

to GND pin shown in Figure 2-1. We recommend a pin header with pin dimensions similar to the Digikey part

number 850-10-050-20-001000. The U1 MCU must be removed from the Launchpad.

www.ti.com Introduction

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DRV821xEVM and DRV8220EVM User's Guide 3

Figure 2-1. MSP-EXP430FR5969 LaunchPad connected to EVM

Power Connectors www.ti.com

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3 Test Points

Table 3-1. DRV821xEVM and DRV8220EVM Test Points

Test Point Description

J4 • Header contains all the MCU control signals (EN/IN1, PH/IN2, MODE/nSLEEP, VCC_DRV, and ISENSE).

– EN/IN1 & PH/IN2: input control signals

– MODE/nSLEEP: multi-purpose pin; pin used as MODE selector pin when DRV821xDSG or DRV8220DSG is

populated; pin used as nSLEEP when DRV821xPDSG is populated.

– VCC_DRV: signal functions as nSLEEP when the DRV8220DSG is populated.

– ISENSE: output from the current sense amplifier (U4).

• R2, R3, R4, R16, and R19 can be removed to connect external MCU to J4.

J2 Header use to set the state of the MODE/nSLEEP signal. MODE/nSLEEP can be set to either GND or 3.3 V.

J7 Header use to short VCC_DRV to 3.3 V to awake the DRV8220DSG

J6 4-pin connector to program MSP430FR2100 on the EVM (read Section 2)

J5 GND test point

TP6 and TP7 OUT1 and OUT2 test points

TP1 VM test point

TP5 VCC (3.3 V LDO output) test point.

www.ti.com Test Points

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DRV821xEVM and DRV8220EVM User's Guide 5

4 MODE/nSLEEP Jumper and Speed-Adjustment Potentiometers

The MODE/nSLEEP header (J2) and jumper allow the user to set the state of the MODE pin or nSLEEP pin

depending on the device populated on the EVM. If the DRV821xDSG is populated, J2 allows the user to select

from the input modes of PWM (GND), PH/EN (3.3 V), and independent half-bridge control (Hi-Z).

If the DRV821xPDSG is populated, J2 allow the user to set the device to a low-power sleep mode (GND) or to

enable the device (3.3V). MODE is only applicable to the DRV821xDSG and DRV8220DSG. The inputs to the

DRV821xDSG are EN/IN1 and PH/IN2. The functions of these inputs are IN1 and IN2 when the MODE is GND

(PWM mode) or Hi-Z (independent half-bridge mode). When MODE is connected to 3.3 V (PH/EN control mode)

the input function is a phase/enable (PH/EN) interface.

The MSP430 produces PWM signals for the EN/IN1 and PH/IN2 pins with duty cycles proportional to the voltage

from the PWM potentiometers. The tables below show how to configure the potentiometers for each MODE

configuration.

Figure 4-1. MODE /nSLEEP header and PWM Potentiometers

MODE/nSLEEP Jumper and Speed-Adjustment Potentiometers www.ti.com

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4.1 PH/EN Control Mode (MODE=Logic High)

When the MODE /nSLEEP pin is logic high on power up, the device latches into PH/EN mode (Figure 4-2).

PH/EN control mode is only supported by the DRV821xDSG devices. PH/EN mode allows for the H-bridge to be

controlled with a speed and direction type of interface. The truth table for PH/EN mode is shown in (Table 4-1).

This method is best for bidirectional driving for one motor.

Figure 4-2. MODE /nSLEEP jumper configuration for PH/EN

Table 4-1. PH/EN Control Mode

EN PH OUT1 OUT2 Description

LOW - turn IN1 PWM Pot

completely counter-

clockwise

X L L Brake, (Low-Side Slow

Decay)

PWM - set IN1 PWM pot

in any position

LOW - turn IN2 PWM pot

completely

counterclockwise

L H Reverse (OUT2 -> OUT1)

PWM - set IN1 PWM pot

in any position

HIGH - turn IN2 PWM pot

completely clockwise

H L Forward (OUT1 -> OUT2)

www.ti.com MODE/nSLEEP Jumper and Speed-Adjustment Potentiometers

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DRV821xEVM and DRV8220EVM User's Guide 7

4.2 PWM Control Mode (MODE = Logic High, DRL, PDSG)

When the MODE pin is logic high on power up, the device latches into PWM mode (Figure 4-3). PWM is the

standard control mode for the DRV82xxDRL and DRV82xxPDSG devices. PWM mode allows for the H-bridge to

enter the Hi-Z state without taking the nSLEEP pin logic low. The truth table for PWM mode for the DSG variants

is shown in Table 4-2 and for the PDSG variants in Table 4-3. This method is best for bidirectional driving for one

motor.

Figure 4-3. MODE /nSLEEP jumper configuration for PWM

Table 4-2. PWM Control Mode for DSG Devices

IN1 IN2 OUT1 OUT2 Description

LOW- turn EN/IN1 PWM pot

completely counter-clockwise

LOW- turn PH/IN2 PWM pot

completely counter-clockwise

Hi-Z Hi-Z Coast (H-bridge Hi-Z)/

Low-power automatic

sleep mode

PWM - turn EN/IN1 PWM pot in any

position

HIGH- turn PH/IN2 PWM pot

completely clockwise

L H Reverse (OUT2 -> OUT1)

PWM - turn EN/IN1 PWM pot in any

position

LOW- turn PH/IN2 PWM pot

completely counter-clockwise

H L Forward (OUT1 -> OUT2)

HIGH- turn EN/IN1 PWM pot

completely clockwise

HIGH- turn PH/IN2 PWM pot

completely clockwise

L L Brake, (Low-Side Slow

Decay)

Table 4-3. PWM Control Mode for PDSG Devices

nSLEEP IN1 IN2 OUT1 OUT2 Description

0 (connect MODE/

nSLEEP pin to GND

pin)

X X Hi-Z Hi-Z Coast (H-bridge Hi-Z)/

Low-power automatic

sleep mode

1 (connect MODE/

nSLEEP pin to 3.3V

pin)

PWM - turn EN/IN1

PWM pot in any

position

HIGH- turn PH/IN2

PWM pot completely

clockwise

L H Reverse (OUT2 ->

OUT1)

1 (connect MODE/

nSLEEP pin to 3.3V

pin)

PWM - turn EN/IN1

PWM pot in any

position

LOW- turn PH/IN2

PWM pot completely

counter-clockwise

H L Forward (OUT1 ->

OUT2)

1 (connect MODE/

nSLEEP pin to 3.3V

pin)

HIGH- turn EN/IN1

PWM pot completely

clockwise

HIGH- turn PH/IN2

PWM pot completely

clockwise

L L Brake, (Low-Side

Slow Decay)

MODE/nSLEEP Jumper and Speed-Adjustment Potentiometers www.ti.com

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4.3 Independent Half-Bridge Control Mode (MODE=Hi-Z)

When the MODE pin is Hi-Z on power up, the device is latched into independent half-bridge control mode.

Independent half bridge control is only supported by the DRV821xDSG devices. This mode allows for each half-

bridge to be directly controlled in order to support high-side slow decay or driving two independent loads. The

truth table for independent half-bridge mode is shown in Table 4-4.

Figure 4-4. MODE /nSLEEP does not require a jumper for independent half-bridge mode

Table 4-4. Independent Half-Bridge Control Mode

INx OUTx Description

LOW - turn INx PWM pot completely counter-

clockwise

L OUTx Low-Side ON

HIGH - turn INx PWM pot completely clockwise H OUTx High-Side ON

PWM - turn INx PWM pot in any position PWM PWM = 0 -> OUTx Low-Side

ONPWM = 1 -> OUTx High-Side ON

www.ti.com MODE/nSLEEP Jumper and Speed-Adjustment Potentiometers

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DRV821xEVM and DRV8220EVM User's Guide 9

5 Current Sensing

The DRV821x/8220EVM comes with current sensing circuitry consisting of a low-side sense resistor and a

current sensing amplifier. The current sensing capabilities can only be used with the DSG/PDSG devices. Figure

5-1 show the schematic for the current sensing circuity. The components enclosed by the red rectangles are the

current sensing components. The sense resistor (R20) is connected between the GND pin of the device to the

larger GND plane of the EVM. R20 is populated with a 0Ω resistor on the EVM but can be replaced with another

resistor value if the user desires to use it for current sensing. C11 is used for filtering noise at the GND pin of the

device and is not populated on the EVM.

The user needs to populate C11 with a desired value. The current sense amplifier and the surrounding

components (R17, R18, and C6) are not populated on the EVM. The user needs to populate the amplifier and

the surrounding components to use the current sensing capabilities. The current sense amplifier is the

TLV9051IDRL which can be ordered here. R17 and R18 set the closed loop gain of the amplifier and have to be

chosen by the user.

The output of the current sense amplifier (AMP_OUT) can be measured at the “ISENSE” pin on header J4.

AMP_OUT is connected to an ADC pin on the MCU to monitor the current and to create current sensing

algorithms.

Figure 5-1. Current Sensing Schematic

Current Sensing www.ti.com

10 DRV821xEVM and DRV8220EVM User's Guide SLOU540A – NOVEMBER 2020 – REVISED DECEMBER 2020

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