Texas Instruments DRV814x-Q1EVM User manual

User's Guide
DRV824x_DRV814x-Q1EVM User's Guide
ABSTRACT
This document is provided with the DRV824x-Q1EVM and DRV814x-Q1EVM customer evaluation module
(EVM) as a supplement to the Automotive DRV824x-Q1 and DRV814x-Q1 Motor Driver data sheets. This user's
guide details the hardware implementation of the EVM and how to install the software packages.
Table of Contents
1 Introduction.............................................................................................................................................................................2
1.1 Overview............................................................................................................................................................................ 2
2 Evaluation Hardware Overview............................................................................................................................................. 3
2.1 Connections Overview....................................................................................................................................................... 3
2.2 Connection Details............................................................................................................................................................. 3
2.3 LED Indicators..................................................................................................................................................................12
2.4 Headers and Connectors (Hardware Device Variant)...................................................................................................... 13
2.5 Headers and Connectors (SPI variant)............................................................................................................................ 13
3 EVM GUI Control Application.............................................................................................................................................. 14
3.1 MSP430 FET Drivers....................................................................................................................................................... 14
3.2 Cloud-based GUI............................................................................................................................................................. 15
3.3 Local Installation.............................................................................................................................................................. 16
4 EVM GUI Operation...............................................................................................................................................................17
4.1 Hardware Setup............................................................................................................................................................... 17
4.2 Launching the DRV824x_DRV814x-Q1EVM GUI Application......................................................................................... 17
4.3 Using the DRV824x_DRV814x-Q1EVM GUI Application.................................................................................................19
5 Revision History................................................................................................................................................................... 25
Trademarks
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All trademarks are the property of their respective owners.
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1 Introduction
1.1 Overview
The DRV824x and DRV814x family of devices are a fully integrated H-bridge and half-bridge drivers,
respectively, intended for a wide range of automotive applications. The DRV824x device can be configured as
a single H-bridge driver, or two independent half-bridge drivers. Designed in Texas Instruments' proprietary high
power BiCMOS process technology node, this monolithic die device in a power package offers excellent power
handling and thermal capability while providing compact package size, ease of layout, EMI control, accurate
current sense, robustness and diagnostic capability. The DRV824x and DRV814x family of devices each has
an identical pin function with scalable RDSON (current capability) to support different loads with minimal design
changes within their respective family (H-bridge or half-bridge).
The device integrates an N-channel output stage, charge pump regulator, high side current sensing and
regulation, current proportional output, and protection circuitry. A low-power sleep mode is provided to achieve
ultra-low quiescent current draw by shutting down most of the internal circuitry. The device offers voltage
monitoring and load diagnostics as well as protection features against output over current and device over
temperature. Fault conditions are indicated on the nFAULT pin. The device is available in two interface variants -
hardware (“HW”) and SPI. The HW variant uses strapping resistors for fixed configuration. The SPI variant offers
more flexibility in device configuration and fault observability with an external controller.
1.1.1 Purpose and Scope
This document is designed to be used as a startup guide and to supplement the DRV824x-Q1EVM and
DRV814x-Q1EVM (“EVM”). The scope of this document is to provide the user with a guide to evaluate the
DRV824x-Q1 and/ or DRV814x-Q1 device using a Graphical User Interface (GUI). The GUI application is
required to control the EVM. This document covers the required EVM connections, configuration, and steps to
acquire and use the GUI application for a successful evaluation.
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2 Evaluation Hardware Overview
CAUTION
Hot surfaces on the EVM include the DRV824x-Q1 or DRV814x-Q1 device (U1) and the area
surrounding.
When operating the EVM at the maximum device specifications and a high ambient
temperature, external cooling fans can be required to minimize potential fire hazard, personal
injury, or both.
2.1 Connections Overview
The major blocks of the EVM include the DRV824x-Q1 or DRV814x-Q1 driver, MSP430G2553 microcontroller
(MCU) controlling the driver, and MSP430F5528 (EZFET_LITE) for UART and JTAG communications over USB.
The EVM is designed for an input supply from 4.5 to 36 V at the rated peak drive current for each device (refer to
device data sheet). The DRV824x-Q1 or DRV814x-Q1 device provides current to a brushed DC motor or other
load. The MCU communicates with the GUI via the EZFET_LITE USB to Virtual COM Port (VCP) to control the
DRV824x-Q1 or DRV814x-Q1 device.
2.2 Connection Details
See Table 2-1 for a brief comparison of both the DRV824x-Q1EVM and DRV814x-Q1EVM in the VQFN
HotRod™ package. The 28-pin leaded package (HVSSOP or HTSSOP) version of EVM leverages much
of the same design and is also covered by this document. From a firmware and GUI perspective, the two
package options are interchangeable. The 40x40mm lower-right quadrant of the EVM is modified to the H-bridge
and half-bridge devices. The DRV814x-Q1 VQFN device orientation is rotated for better power and thermal
characteristics, taking advantage of the busbar-like footprint of the HotRod™ package.
A supply voltage ranging from +4.5 VDC to +36 VDC from a battery or a DC voltage source is connected to the
voltage supply pins. This connection includes fuse, reverse polarity, and transient protection.
The OUT1 and OUT2 banana jacks on the DRV824x-Q1EVM can be connected to a brushed motor, inductor,
or latched relay coil when used in PWM or phase/enable (PH/EN) mode. When used in independent half-bridge
mode, the OUT1 pin can drive one load and the OUT2 pin can drive a second load.
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Table 2-1. DRV814x-Q1EVM and DRV824x-Q1EVM Comparison
DRV814x-Q1EVM DRV824x-Q1EVM
•Single half-bridge output in VQFN HotRod™ package
•SPI and Hardware control variants
•H-bridge/ dual independent half-bridge outputs in VQFN
HotRod™ package
•SPI and Hardware control variants
Note
DRV8242 does not support independent half-bridge mode
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2.2.1 Common Connectors and Headers Across all EVM Variants
Figure 2-1 shows a larger view of the DRV824x-Q1EVM. Because the DRV814x-Q1EVM shares much of the
same design, only the DRV824x-Q1EVM is referenced.
The micro-USB connection at the top of the EVM is used for GUI communications, and MCU firmware updates.
Main supply input A supply voltage ranging from +4.5 VDC to +36 VDC from a battery or a DC voltage source is
connected to the large screw thermal block (fused and reverse polarity protection).
Connect the bi-directional brushed-DC motors to the OUT1 and OUT2 banana jacks. Ground and VM supply
connections are provided as a convenience for high-side or low-side switched loads (for example, unidirectional
brushed DC motor or solenoid).
Note
VM has a small voltage drop with respect to the main supply due to the N-channel MOSFET in the
reverse protection circuit.
Figure 2-1. DRV824x-Q1EVM
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2.2.2 MCU Reset and User Button
The small tactile push button is typically used to reset the MCU Figure 2-2. Typically resetting the MCU is not
necessary, however the MCU automatically clears the nFAULT indicator on initial power-up if the user finds the
fault indicator is set due to cycling the power on the external supply. This is normal (nFAULT always comes up
asserted on the DRV824x and DRV814x devices).
A jumper is installed shorting pins 1 and 2 on header J1 for the MCU reset function. If a firmware reset is
necessary, then the push button is pressed once and released. Following a reset, a proper startup is indicated by
the blinking STATUS LED. If the jumper is moved to pins 2 and 3 on J1, then this routes the button to a spare
GPIO pin on the MSP430 MCU, and can be used for personal purposes in the firmware. Beginning with version
0.22 of the firmware, an interrupt subroutine (ISR) has been assigned to this GPIO input, and automatically
puts the DRV824x device in PH/EN mode, and energize the output OUT1 terminal (or OUT terminal of the
DRV814x device) at 25% duty cycle on the first press of the User button with a 12 V power supply connected
to the connector J14, BAT+ and GND screw terminals and the Micro-USB connected. Pressing the button again
disables the output. This can be repeated with the same on/ off behavior. The user can connect a brushed DC
motor across OUT1 and OUT2 terminals of the DRV824x EVM or OUT and GND of the DRV814x EVM, or
simply an oscilloscope.
Note
No diagnostics are enabled in this simple test case – open load detection is not active
When in this test mode, the STATUS LED (D1) is fully on when the output is active, and returns to approximately
1 Hz blinking when the output is off with an SPI EVM or an approximately 0.1 Hz blinking with an HW EVM. After
completion of the standalone EVM testing, TI recommends to position the jumper settings back to pins 1 and 2.
Figure 2-2. MCU Reset and User Button
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2.2.3 Communication Interfaces
The micro-USB connection is the primary communication interface from your PC to the EVM GUI Application.
Figure 2-3 illustrates connection associated with communications between the EVM and GUI, as well as
firmware programming (some components have been removed from the picture for clarity).
The EZFET_LITE (based on the Texas Instruments MSP430F5528) is programmed at the factory with firmware
that implements UART and JTAG over USB.
Figure 2-3. EVM Communication Connections
Table 2-2 describes each communication connection.
Table 2-2. Communication Description
Designator Description
J5 MSP430 14-pin JTAG interface. Used for programming EZFET_LITE firmware on
MSP430F5528 during manufacturing and not used during normal user operation.
J6 Micro-USB interface for main MCU (MSP430G2553). Both UART and JTAG are routed over
this connection.
J7 These headers route communications and 3.3 V to the main MCU. Jumpers must be
installed on 3V3, RX, TX, TDIO and TCK positions.
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2.2.4 Supply Input
Figure 2-4 illustrates the portions of the EVM associated with the main supply input powering the DRV824x-Q1
or DRV814x-Q1 device, and the associated loads. Starting from the upper-left, and working clockwise around
the image:
• Supply reverse polarity protection. The Texas Instruments LM74610QDGKRQ1 drives a Texas Instruments
CSD18513Q5A 40 V 100 A N-channel MOSFET.
• Fuses.
Note
DRV8243-Q1 EVMs only has a single fuse populated
• Not pictured (underside): TVS diode.
• High current supply input with screw terminals. Supply shall be between +4.5 VDC to +36 V. Test points are
provided.
• Pi filter section comprising two 50 V 150 uF capacitors and a 1 mH inductor (misc. passive components
omitted from image for simplicity).
Figure 2-4. Main Supply Section
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2.2.5 Current Limit Header (RIPROPI)
The DRV824x and DRV814x family of devices integrate a current sense output using current mirrors on the
low-side power MOSFETs on the IPROPI device pin. The IPROPI pin sources a small current proportional
to the current in the high side MOSFETs (current sourced out of the IPROPI pin). The IPROPI current can
be converted to a proportional voltage using an external resistor ( RIPROPI). The integrated current sensing
allows the DRV824x and DRV814x devices to limit the output current with a fixed off-time PWM chopping
scheme and provides load information to an external controller to detect changes in load or stall conditions.
The integrated current sensing outperforms traditional external shunt resistor sensing by providing current
information even during the off-time slow decay recirculating period. Additionally, BOM cost and PCB area is
reduced by eliminating a large external power shunt resistor. The off-time PWM current regulation level can be
configured during motor operation through the ITRIP function to limit the load current accordingly to the system
demands.
Selecting the RIPROPI value must be done in conjunction with the ITRIP level (configured through SPI or external
jumper selection depending on SPI or hardware device variant) and is governed by the following relationship:
ITRIP (AMPS) = VITRIP_LVL/RIPROPI * AIPROPI (1)
Example: (Typical values from DRV8245-Q1 data sheet; AIPROPI vary by part number):
Refer to the Electrical Characteristics CURRENT SENSE AND REGULATION table in device data sheet for
RIPROPI values matching the output capability of the device installed on your EVM.
Figure 2-5 shows the header with user selectable RIPROPI values.
Figure 2-5. RIPROPI Header
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2.2.6 Device Signal and Control Header
The J4 header Figure 2-6 is provided for users who wany to interface an external control design and is also
a convenient means for probing all device control signals. When interfacing with an external control design,
remove the associated 0-ohm resistors immediately adjacent to the silk screen label.
Note
PH/IN2 signal is not present on DRV814x-Q1EVM variants. Refer to the EVM schematic for more
details.
Figure 2-6. DRV824x-Q1EVM Signal and Control Header
2.2.7 Device Signal Test Points
The signals corresponding to each test point for both the hardware and SPI variant is given below for each of the
devices. The naming convention for the test points is as follows: SPI/ HW. The signal on the test point for the SPI
versions of the devices is listed first and then the HW variant.
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