Texas Instruments DRV821 EVM Series User manual

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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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
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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.
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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.
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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)
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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)
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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
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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
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6 Operation of the EVM
6.1 Dual Motor Operation
This mode allows for up to two motors to be controlled independently. The DRV821xDSG are the only devices
that can support dual motor operation.
Use the following steps to operate the EVM with up to two loads with single direction speed control:
1. Make sure only one driver is populated and no power is being supplied to the EVM.
2. Connect a DC motor across OUT1 and GND. If desired, connect an additional DC motor across OUT2 and
GND. See Figure 6-2 below for a diagram.
3. Adjust the potentiometer, EN/IN1 PWM and PH/IN2 PWM, to minimum voltage by turning the wheel counter-
clockwise all the way. This minimizes the motor speed of the motor connected across OUT1. If using a
second motor, perform this process with potentiometer IN2 PWM as well.
4. Remove the jumper from the MODE/nSLEEP header (J2) so the MODE pin is Hi-Z.
5. Apply power to J1 header.
6. Turn potentiometer, EN/IN1 PWM, clockwise and the motor connected across OUT1 will begin to turn.
Continue adjusting, as desired, until the maximum speed is reached. If using a second motor perform this
process with potentiometer PH/IN2 PWM as well.
7. The direction of the motor turning can be reversed by removing the connection from GND to the motor and
connecting the motor to VM. If this is done, the potentiometer associated with controlling the motor will
operate in reverse and thus should be turned all the way clockwise before powering on the board and then
slowly turned counter-clockwise to speed up the motor.
Use the following steps to operate the EVM with outputs paralleled to decrease the overall RDS(on) by half and
accommodate larger current requirements:
1. Make sure only one driver is populated and no power is being supplied to the EVM.
2. Short EN/IN1 and PH/IN2 pins on J4 with a jumper. See Figure 6-1.
3. Short OUT1 and OUT2 at connector J3 with an unexposed small wire or short the OUT1 and OUT2 test
points with a small cable with clips. Make sure the wire is low resistance and can support at minimum 4-A
continous peak current. Connect one end of the motor or desired load on either OUT1 or OUT2 on connector
J3 and the other end on either VM (for low-side driving) or GND (for high-side driving). See Figure 6-3 and
Figure 6-4 for a block diagram.
4. Adjust the potentiometer, EN/IN1 PWM and PH/IN2 PWM, to minimum voltage by turning the wheel all the
way counter-clockwise (if one end of the motor is connected to GND) or clockwise (if one end of the motor is
connected to VCC). This minimizes the speed of the motor connected across OUT1 and OUT2.
5. Remove the jumper from the MODE/nSLEEP header (J2) so the MODE pin is Hi-Z.
6. Apply power to J1 header.
7. Turn potentiometer, EN/IN1 PWM, clockwise and the motor connected across OUT1 will begin to turn.
Continue adjusting, as desired, until the maximum speed is reached. Make sure to not move PH/IN2 PWM
potentiometer.
8. The direction of the motor turning can reversed by removing the connection from GND to the motor and
connecting the motor to VM and vice-versa. If this is done, the potentiometer associated with controlling the
motor will operate in reverse and thus should be turned all the way clockwise (if motor originally connected to
GND) or counter-clockwise (if motor originally connected to VCC) before powering on the board and then
slowly turning the EN/IN1 PWM potentiometer in the opposite direction to increase the motor speed.
www.ti.com Operation of the EVM
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Figure 6-1. EN/IN1 and PH/IN2 pins shorted
DRV821xDSG
VM
1
OUT1
2
OUT2
3
GND
4
VCC
8
MODE
7
IN1
6
IN2
5
Thermal
Pad
0.1 …F
CBulk
VM
VM
Pump
Valve 0.1 …F
Controller
PWM
VCC
O
X
RLimit
Figure 6-2. Half-bridge mode used as a high-side and low-side driver for two loads
DRV821xDSG
VM
1
OUT1
2
OUT2
3
GND
4
VCC
8
MODE
7
IN1
6
IN2
5
Thermal
Pad
BDC
0.1 …F
CBulk
VM
0.1 …F
Controller
PWM
VCC
O
X
RLimit
Figure 6-3. Half-bridge mode used as a high-side driver with outputs paralleled
Operation of the EVM www.ti.com
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DRV821xDSG
VM
1
OUT1
2
OUT2
3
GND
4
VCC
8
MODE
7
IN1
6
IN2
5
Thermal
Pad
BDC
VM
0.1 …F
CBulk
VM
0.1 …F
Controller
PWM
VCC
O
X
RLimit
Figure 6-4. Half-bridge mode used as a low-side driver with outputs paralleled
6.2 Single Motor Operation
This mode allows for bidirectional control of one motor. Connect a DC motor across OUT1 and OUT2. Reversing
direction is controlled by the potentiometer. This is described in detail in Section 4. Use the following steps to
operate the EVM with a signal motor and bidirectional speed control:
1. Make sure only one driver is populated and no power is being supplied to the EVM.
2. Connect a motor across OUT1 and OUT2. See Figure 6-5 for a block diagram of the DRV821xDSG.
3. If the DRV821xDSG is populated on the EVM, use a jumper to connect the MODE/nSLEEP header (J2) to
3.3 V or GND to set the input mode to PWM control mode or PH/EN mode respectively.
4. If the DRV8220DSG is populated on the EVM, use a jumper to connect the MODE/nSLEEP header (J2) to
3.3 V or GND to set the input mode to PWM control mode or PH/EN mode respectively. Also connect
VCC_DRV (J7) to 3.3V via a jumper to enable the device.
5. If the DRV821xPDSG is populated, connect the MODE/nSLEEP header to 3.3V to set nSLEEP logic high and
enable the device (The MODE pin becomes the nSLEEP pin for the PDSG devices). The DRV821xPDSG
only supports PWM control mode.
6. If a DRV82xxDRL is populated, the state of the MODE/nSLEEP jumper is ignored and the control mode is set
to PWM by default. The DRL devices only support PWM control mode.
7. Adjust the potentiometer, EN/IN1 PWM and PH/IN2 PWM, to minimum voltage by turning the wheel counter-
clockwise all the way. This minimizes the speed of the motor connected across OUT1 and OUT2.
8. Apply power to J1 header.
9. Turn potentiometer, EN/IN1 PWM, clockwise and the motor connected across OUT1 and OUT2 will begin to
turn. Continue adjusting, as desired, until the maximum speed is reached.
10.Control the motor direction and speed by adjusting the potentiometers according to the tables in Section 4.
Controller
PWM
PWM
VCC
DRV821xDSG
VM
1
OUT1
2
OUT2
3
GND
4
VCC
8
MODE
7
IN1
6
IN2
5
Thermal
Pad
BDC
0.1 …F
CBulk
VM
VCC
0.1 …F
Figure 6-5. DRV821xDSG PWM single motor operation
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7 Removing and Installing Supported Motor Drivers
The EVM can support the DRV8210/8212/8220DSG, DRV8210/8212PDSG, and DRV8210/8212/8220DRL
devices. The EVM contains two footprints that can support the devices listed above. Footprint U2 supports the
DSG and PDSG devices and footprint U5 supports the DRL devices. U2 and U5 share the same output
connector so only one of the two footprints should be populated at any time. Below are step-by-step instructions
on how to remove and place different drivers on the EVM:
1. Disconnect power from the EVM.
2. Carefully de-solder the device from the PCB. Make sure to follow proper soldering and ESD protection
procedures to prevent damage to the EVM.
3. Carefully solder the new device to the EVM. See Table 7-1 for further instructions. Visit ti.com or any
authorized third party vendor to purchase the desired driver.
4. The EVM uses a combination of resistors to identify the device that is populated on the board. Figure 7-1
show the resistors used for device identification. The MCU reads the values of ID1, ID2, and ID3 to determine
the device that is installed on the EVM. The firmware will function slightly different depending on the device
that is on the board. Each of the supported devices have unique values for ID1, ID2, and ID3 which are set by
R5, R7, R8, R9, R13, and R14. After installing the new device, make sure to populate the appropriate
resistors. Table 7-2 show the unique device ID for each supported device and the resistor combination to
populate.
Table 7-1. Procedure For Soldering New Device and Passives to EVM
New device being installed Soldering procedures
DRV8210/8212DSG or DRV8210/8212PDSG • Solder the device to footprint U2. Make sure pin 1 of device aligns with the dot on
the PCB
• If not already de-populated, de-populate R10
• If not already populated, populate C6 (1210, 25V, 22µF), C9 (1210, 25V, 22µF),
C3 (0402, 25V, 0.1µF), C1 (0603, 25V, 0.1µF), and R15 (0603, 0Ω)
DRV8220DSG • Solder the device to footprint U2. Make sure pin 1 of device aligns with the dot on
the PCB
• If not already de-populated, de-populate R15
• If not already populated, populated C6 (1210, 25V, 22µF), C9 (1210, 25V, 22µF),
C3 (0402, 25V, 0.1µF), C1 (0603, 25V, 0.1µF).
• If not already populated, populate J7 (2x1, 2.54 mm, TH header). See Table 3-1 to
learn about the function of J7 header.
DRV8210/8212/8220DRL • Solder the device to footprint U5. Make sure pin 1 of device aligns with the dot on
the PCB.
• If not already de-populated, de-populate C6, C9, C3, C1, R10, and R15.
• If not already populated, populate C10 (0402, 25V, 0.1µF).
Figure 7-1. Device ID Resistors
Table 7-2. Unique Device Identifier Resistors
Device Device ID Device ID resistors to populate
DRV8210DSG ID1=0; ID2=0; ID3=0 R9, R13, R14
DRV8210PDSG ID1=0; ID2=0; ID3=1 R9, R13, R8
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Table 7-2. Unique Device Identifier Resistors (continued)
Device Device ID Device ID resistors to populate
DRV8210DRL ID1=0; ID2=1; ID3=0 R9, R7, R14
DRV8212DSG ID1=0; ID2=1; ID3=1 R9, R7, R8
DRV8212PDSG ID1=1; ID2=0; ID3=0 R5, R13, R14
DRV8212DRL ID1=1; ID2=0; ID3=1 R5, R13, R8
DRV8220DSG ID1=1; ID2=1; ID3=0 R5, R7, R14
DRV8220DRL ID1=1; ID2=1; ID3=1 R5, R7, R8
8 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision * (November 2020) to Revision A (December 2020) Page
• Updated Caution information.............................................................................................................................. 1
www.ti.com Revision History
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