Texas Instruments DRV824x-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 H-Bridge and DRV814x-Q1 Half-Bridge Motor Driver
datasheets. This user's guide details the hardware implementation of the EVM and how to install the software
packages.
Table of Contents
1 Revision History......................................................................................................................................................................1
2 Introduction.............................................................................................................................................................................2
2.1 Overview............................................................................................................................................................................ 2
3 Evaluation Hardware Overview............................................................................................................................................. 3
3.1 Connections Overview....................................................................................................................................................... 3
3.2 Connection Details............................................................................................................................................................. 3
3.3 LED Indicators....................................................................................................................................................................9
3.4 Headers and connectors (Hardware device variant)........................................................................................................ 11
3.5 Headers and connectors (SPI variant)............................................................................................................................. 11
4 EVM GUI Control Application.............................................................................................................................................. 12
4.1 MSP430 FET Drivers....................................................................................................................................................... 12
4.2 Cloud-based GUI............................................................................................................................................................. 12
4.3 Local Installation.............................................................................................................................................................. 13
5 EVM GUI Operation...............................................................................................................................................................14
5.1 Hardware Setup............................................................................................................................................................... 14
5.2 Launching the DRV824x_DRV814x-Q1EVM GUI Application......................................................................................... 14
5.3 Using the DRV824x_DRV814x-Q1EVM GUI Application.................................................................................................16
Trademarks
All trademarks are the property of their respective owners.
1 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision * (April 2021) to Revision A (July 2021) Page
• Overview contents updated................................................................................................................................ 2
• Added Note about OUT1 and OUT2 silk screen labels...................................................................................... 4
• Updated LED Functions Description...................................................................................................................9
• Updated Images for new version...................................................................................................................... 12
• Updated Connection Sequencing..................................................................................................................... 14
• Updated EVM GUI operation description and Images for version 0.4.0........................................................... 14
• Updated GUI Application images for version 0.4.0 ..........................................................................................16
• Bullet Points for Passive/Active Diagnostics, Fault and Bridge Current........................................................... 17
• Updated Image and Instructions in Updating Firmware Section.......................................................................21
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2 Introduction
2.1 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.
2.1.1 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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3 Evaluation Hardware Overview
CAUTION
Hot surfaces on the EVM include the DRV824x-Q1 or DRV814x-Q1 device (U1) and the area
surrounding it.
When operating the EVM at the maximum device specifications and a high ambient
temperature, external cooling fans may be required to minimize potential fire hazard,
personal injury, or both.
3.1 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 datasheet). 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.
3.2 Connection Details
See Table 3-1 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 3-1. DRV814x-Q1EVM and DRV824x-Q1EVM Comparison
DRV814x-Q1EVM
•Single half-bridge output in VQFN HotRod™ package
•SPI and Hardware control variants
DRV824x-Q1EVM
•H-bridge/ dual independent half-bridge outputs in VQFN
HotRod™ package
•SPI and Hardware control variants
3.2.1 Common connectors and headers across all EVM variants
Figure 3-1 shows a larger view of the DRV824x-Q1EVM. Because the DRV814x-Q1EVM shares much of the
same design, it will not be covered separately.
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).
Bi-directional brushed-DC motors should be connected 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 (e.g., unidirectional
brushed DC motor or solenoid).
Note
VM will have a small voltage drop with respect to the main supply due to the N-channel MOSFET in
the reverse protection circuit.
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Figure 3-1. DRV824x-Q1EVM
Note
DRV824x-Q1EVMs with HVSSOP package driver device has OUT1 and OUT2 silk screen labels
interchanged. This misprint will be fixed in the next revision of these EVMs.
3.2.2 MCU Reset and User Button
The small tactile push button is typically used to reset the MCU Figure 3-2. Typically resetting the MCU is not
necessary, however the MCU will automatically clear the nFAULT indicator on initial power-up if you find the fault
indicator is set due to cycling the power on the external supply. This is normal (nFAULT will always come up
asserted on the DRV824x and DRV814x devices).
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A jumper should be installed shorting pins 1 and 2 on header J1 for the MCU reset function. If a firmware reset
is necessary, 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, this routes the button to a spare GPIO
pin on the MSP430 MCU, and can be used for your own purposes in the firmware. Beginning with version 0.22
of the firmware, an interrupt subroutine (ISR) has been assigned to this GPIO input, and will automatically put
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. Pressing the button again will disable the output. This can be
repeated with the same on/ off behavior. This can be useful as a quick out-of-box test of the EVM without a
computer or USB connection. You 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) will be fully on when the output is active, and will return 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 it is recommended to position the jumper settings
back to pins 1 and 2.
Figure 3-2. MCU Reset and User Button
3.2.3 Communication Interfaces
The micro-USB connection is the primary communication interface from your PC to the EVM GUI Application.
Figure 3-3 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).
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The EZFET_LITE (based on the Texas Instruments MSP430F5528) is programmed at the factory with firmware
that implements UART and JTAG over USB.
Figure 3-3. EVM Communication Connections
Table 3-2 describes each communication connection.
Table 3-2. 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 should be installed on 3V3, RX, TX, TDIO and TCK
positions.
3.2.4 Supply Input
Figure 3-4 illustrates the portions of the EVM associated with the main supply input powering the DRV824x-Q1
or DRV814x-Q1 device, and the associated load(s). Starting from the upper-left, and working clockwise around
the image:
• Supply reverse polarity protection. The Texas Instruments LM74610QDGKRQ1 drives a Texas Instruments
CSD18513Q5A 40V 100A N-channel MOSFET.
• Fuses (note: DRV8243-Q1 EVMs will only have 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).
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Figure 3-4. Main Supply Section
3.2.5 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 datasheet; AIPROPI will vary by part number):
Refer to the Electrical Characteristics CURRENT SENSE AND REGULATION table in device datasheet for
RIPROPI values matching the output capability of the device installed on your EVM.
Figure 3-5 shows the header with user selectable RIPROPI values.
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Figure 3-5. RIPROPI Header
3.2.6 Device Signal and Control Header
The J4 header Figure 3-6 is provided for users who wish to interface an external control solution and is also
a convenient means for probing all device control signals. When interfacing with an external control solution,
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 your EVM schematic for more
details.
Figure 3-6. DRV824x-Q1EVM Signal and Control Header
3.3 LED Indicators
Figure 3-7 shows the physical location of each LED indicator on the EVM. Placement is the same for all EVMs in
the family.
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Figure 3-7. EVM LED Indicators
Refer to Table 3-3 for descriptions of each LED on the EVM
Table 3-3. EVM LED Indicators and their Functions
Designator Label Description
D1 Status Indicates MCU execution and DRV status.
Flashing approximately 0.1 Hz: DRV in sleep
mode
Flashing approximately 1 Hz: DRV ready,
outputs disabled
Continuously on: DRV output enabled/ active
Alternating with nFAULT: MCU abort
exception
D2 nFAULT Indicates fault condition. Normally off. It is
also normal to briefly see this LED flash
when the MCU becomes active, or RESET
is pressed. This LED may flash continuously
until VM power supply is turned on.
D3 VM VM supply indicator. Normally on if supply
connected to +BAT input.
D5 MODE EZFET_LITE mode indicator. Normally on
during GUI control. On/ flashing when using
JTAG interface.
D6 PWR EZFET_LITE power indicator (must be active
for GUI control).
D7 3V3 3.3 V for MCU (must be active for GUI
control).
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3.4 Headers and connectors (Hardware device variant)
Figure 3-8 shows all configuration jumpers for the DRV824xH-Q1 hardware variant. DRV814xH-Q1 features
the same jumpers, with the exception of "MODE". Each "LVL" silkscreen label directly corresponds to the
datasheet description. Changing the jumper within "MODE" allows the user to use the driver in PH/EN, PWM,
and Independent Half-Bridge mode. Please refer to the device datasheet for more information regarding pin LVL
settings and associated configuration.
Note
IPROPI is common to both hardware and SPI EVM/ device variants and performs the same function.
Figure 3-8. DRV824x and DRV814x Hardware variant configuration jumpers
3.5 Headers and connectors (SPI variant)
The and DRV824xS-Q1 and DRV814xS-Q1 SPI device variants omit all headers associated with the hardware
variant described in the previous section.
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4 EVM GUI Control Application
The GUI application is written with Texas Instruments’ GUI Composer, and can be run directly from a Chrome-
based web browser, or installed onto your computer. Because GUI Composer apps are written with a NodeJS
backend, the GUI application is cross-platform compatible by design. This document will only cover installation
on a PC for sake of brevity, but Mac and Linux users can find installers in the GUI Composer Gallery.
4.1 MSP430 FET Drivers
The MSP430 FET Drivers are required for the operating system to properly enumerate the JTAG and UART
ports created by the EZFET_LITE. The latest drivers can be found here: MSP430 FET Drivers
Download the driver package corresponding to your operating system, extract the archive, and run the installer.
In Windows, two new ports should be enumerated when the EVM is connected Figure 4-1:
Figure 4-1. MSP430 EZFET_LITE enumerated USB ports
Successful installation will also show Texas Instruments as the driver publisher (Figure 4-2):
Figure 4-2. MSP Application UART Driver Properties
4.2 Cloud-based GUI
To launch the GUI application from your Chrome-based browser:
1. Navigate to DRV824x_DRV814x-Q1EVM-GUI.
2. When presented with the list of available GUIs, launch the latest version by clicking in the tile anywhere that
is not related to an icon for downloading the installer or GUI Composer. Refer to Figure 4-3:
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Figure 4-3. TI GUI Composer Gallery Results for Launching or Downloading Local Installer
Hardware setup and operation of the GUI is the same as the desktop version, and is consolidated in the
following EVM GUI Operation section.
4.3 Local Installation
Follow these instructions for downloading and installing the latest version of the EVM GUI application:
1. The DRV824x_DRV814x-Q1EVM Software slvc821a.zip can be downloaded from the EVM product folder
on ti.com. The software downloaded from the EVM product folder contains two zip files, one for the EVM
firmware source code and another for the EVM GUI application Windows installer. The EVM GUI application
installer can also be downloaded from the TI GUI Composer Gallery, DRV824x_DRV814x-Q1EVM-GUI.
2. From the gallery, click the icon in the latest version and select the installer for your operating system
(Windows, Linux or Mac). Refer back to Figure 4-3 in the previous section for a visual depiction of the
Gallery page.
3. Decompress the .zip file.
4. From the decompressed archive, run the installer “DRV824x_DRV814x-Q1EVM-GUI-x.y.z.setup-
win_x.y.z.exe (refer to Figure 4-4). If you have not installed the GUI Composer Runtime, the installer will
take care of this for you. The installer contents will look slightly different for each OS, but should be
self-explanatory.
Figure 4-4. GUI Application Archive Contents
5. You are now ready to run the GUI application on your local machine after completing the hardware setup in
the next section.
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5 EVM GUI Operation
5.1 Hardware Setup
Follow these steps to setup the EVM prior to launching the GUI:
1. It is advised to make any jumper configuration changes prior to powering the EVM. The hardware device
variant will latch MODE, SLEW RATE and DIAG jumper settings after power-up and/ or coming out of sleep
(ITRIP takes effect immediately, however).
For the SPI device variant, it is still advised to make your IPROPI selection prior to powering the EVM.
2. Connect micro-USB cable to J6 (Figure 3-3). The digital portion of the EVM will become active. LEDs D6 and
D7 will illuminate. The nFAULT LED D2 may blink at a fast rate to indicate the absence of VM power supply.
For proper GUI application operation it is important to connect the EVM USB cable to a computer prior to
applying +BAT power to the EVM. For standalone EVM testing a USB connection is not necessary.
3. With the +BAT external supply outputs disabled, connect +BAT supply to the screw terminals on the EVM
(J14), observing polarity (Figure 3-4).
4. Energize the +BAT supply. VM LED D3 will illuminate. If VM LED does not illuminate, verify polarity and
check fuse(s) are installed and have continuity. Power consumption will be on the order of 10mA @ +12VDC
input. Significantly higher or lower may indicate a hardware problem if the fuse and supply polarity are
correct.
5. The EVM is ready to be used with the GUI application ( Section 5.2). In certain situations, such as while
disconnecting and reconnecting VM power before the power supply capacitors are fully discharged a proper
firmware reset may not happen. A proper reset is indicated by the STATUS LED D1 blinking at a rate of
approximately 1 Hz for the SPI variant EVMs and approximately 0.1 Hz for the HW variant EVMs. If the
Status LED is not blinking as expected, press the reset push button once with jumper J1 installed in the RST
position. Do not unplug the USB cable while the VM power is active. If you do, switch off the VM power, wait
until it is fully discharged and proceed to step 2.
6. The latest version of the GUI application is bundled with the latest version of the EVM firmware. It is
recommended to do a firmware update before selecting and connecting to an EVM variant using the GUI
application. The firmware update procedure is described in the Section 5.3.4 section of this User's Guide.
5.2 Launching the DRV824x_DRV814x-Q1EVM GUI Application
Whether using the desktop or web version of the GUI, the user experience and steps covered below will be the
same. It is assumed the hardware setup steps in the previous section have already been completed.
1. Launch the GUI application
2. From the screen referenced in Figure 5-1, select the EVM variant connected using the icons on the right.
Note
The ‘S’ and ‘H’ part number decorators – these indicate either the SPI or Hardware variant of the
device.
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Figure 5-1. DRV824x_DRV814x-Q1EVM GUI Home Screen
3. After clicking the correct EVM type, the GUI application will initiate communications with the EVM.
Connection confirmation will be displayed as shown below in Figure 5-2:
Note
If the EVM GUI does not register a successful connection after multiple attempts do a firmware
update and then select an EVM variant for connecting using the GUI application.
Figure 5-2. Successful EVM Connection
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4. At this point, the user may set-up the EVM for device evaluation:
• Register Map page for the SPI device variants for read/ write access of register bit fields.
• Driver Control page with configuration and diagnostic options.
• GUI Home page to re-select the EVM if necessary.
Figure 5-3. DRV824x_DRV814x-Q1EVM GUI Navigation
5.3 Using the DRV824x_DRV814x-Q1EVM GUI Application
5.3.1 Register Map Page (SPI Device Variant)
The Register Map page shown below in Figure 5-4 allows the user to read/ write values to individual fields.
Register read-back is read "Every 1 sec" by default. Enabling this will start periodically polling the device
registers. "Off " mode enables a manual read. Auto-read set to "off" is helpful for reducing SPI chatter when
using a logic analyzer or performing EMC measurements.
Figure 5-4. SPI device variant Register Map Page
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5.3.2 Driver Control Page (SPI Device Variant)
Figure 5-5. Driver Control Page
Starting from left to right in Figure 5-5, we have:
•WAKE The wake widget controls the nSleep device which directly controls the nSleep pin. The user cannot
switch between modes when the device is asleep in SPI mode, and the default for the SPI variant is "awake."
•ENABLE DRIVER Directly controls the DRVOFF pin. When the bridge control is active, the user cannot
change between modes or observe the passive diagnostics.
•MODE Programs the S_MODE register and will alter the appearance of the BRIDGE CONTROL depending
on your selection. There is a difference in MODE options between the DRV824x and DRV814x device
families. The DRV814x devices only operate in one fixed mode where the user can only switch between high
side and low side load connections. The high side connection connects the load between VM and OUT while
the low side connection connects the load between OUT and GND as can be seen in Figure 5-6
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Figure 5-6. DRV814x High Side and Low Side Connections
In the DRV824x devices, Phase/Enable mode only has one duty cycle slider while the Independent Half-
bridge mode and PWM mode each have two sliders.
When changing between modes, there will be a "Load Connection Warning" popup. If the load is incorrectly
connected and the user attempts to run the motor on the GUI it can damage the device and may cause harm
to the user. This is especially important when in Independent Half-Bridge mode. The load connection warning
will appear every time the user selects a new mode or repeatedly selects the current mode. Figure 5-7 shows
the pop-up window for the Independent Half-Brige mode selection.
Note
With the DRV824x devices, the GUI allows to switch between high side and low side load
connection only using the Independent Half-Bridge mode selection pop-up window.
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Figure 5-7. DRV824x Independent Half-Bridge Mode High Side and Low Side Load Connection
Note
DRV824x-Q1EVMs with HVSSOP package driver device has OUT1 and OUT2 silk screen labels
interchanged. This misprint will be fixed in the next revision of these EVMS.
•BRIDGE CONTROL The Start Drive button allows the software state machine to start running on the MCU.
Prior to starting, the user may wish to tweak the desired direction, ramp rate, slew rate, as well as check for
properly connected load connections. After pressing , the duty cycle slider(s) become
available for modification. The output will automatically soft-start using the Ramp Rate parameter.
•PASSIVE/ACTIVE DIAGNOSTICS The SPI variant features both passive and active diagnostics. The passive
diagnostics also known as Off-line Passive (OLP), may only be used when ENABLE DRIVER is disabled
(Off-state). It will show up in a separate pop-up window as can be seen in Figure 5-8. A representative table
from the device datasheet is displayed in this window for guidance to perform the passive diagnostics. Each
row of the table covers a specific combination of user input selection, the corresponding OLP setup and load
status inference from the OLP_CMP comparator output on the nFAULT pin. See device datasheet for more
details. The required S_DIAG selection can be made using the GUI for SPI devices. The required DIAG
jumper setting must be done when WAKE is Asleep for HW devices prior to enabling passive diagnostics.
The nSLEEP and DRVOFF inputs are logic 1 while observing passive diagnostics. Inputs for EN/IN1 and
PH/IN2 are selected using the switches in the GUI. It may take a few seconds for the pull up, pull down
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resistors, and the OLP_CMP output status to update due to the latency between the EVM hardware and the
GUI application.
Figure 5-8. Passive Diagnostics Pop-Up Window
The Active Open Load Diagnostics are only for High-Side loads with the DRV824x device, Independent
Half-Bridge mode, and the DRV814x Half-Bridge device. The Active Diagnostics not exist in the Hardware
variants.
•FAULTS Press the clear button to clear all the latched faults. Next to the clear button is the CONFIG button
for SPI variants. This button allows the user to have more control over the modification of fault reporting. For
example, selecting Automatic Retry would allow the faults to clear without any manual interference.
•BRIDGE CURRENT The Bridge Current displays moving average and cycle peak load current values
calculated from a window of samples of the voltage VIPROPI (VIPROPI = RIPROPI × IPROPI) on the IPROPI
output. Each periodic window of samples is referred to as a cycle. The samples are captured using the
integrated 10-bit analog to digital converter in the MCU of the EVM. The displayed values are only indicative
of the load current during the sampling window. The IPROPI analog output pin available on the header J4
of the EVM can be used for accurate real-time measurement using a multimeter or for capturing the load
current waveform using an oscilloscope. Current scaling is done by selecting a desired RIPROPI resistor with
the IPROPI jumper setting on the current limit headeer J2 of EVM. See Section 3.2.5. Match the RIPROPI
setting on the GUI with the IPROPI jumper setting of the EVM.
Every control also has a help tip associated with it to quickly help the user while running the GUI.
5.3.3 Driver Control Page (HW Device Variant)
There are a few other minor differences between the SPI and HW device variant which are noted below:
•WAKE For the Hardware variant, it is necessary for the jumpers to be selected while the device is asleep,
and the default for the HW variant is "asleep". If the user makes changes to the jumpers while the device is
awake, the device will not recognize those changes.
•ENABLE DRIVER Directly controls the DRVOFF pin. When the bridge control is active the user cannot
observe the passive diagnostics.
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