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  • DRV5825P Evaluation Module User's Guide

    • SLAU628 August   2020 DRV5825P

       

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  • DRV5825P Evaluation Module User's Guide
  1.   Abstract
  2.   Trademarks
  3. 1Hardware Overview
  4. 2Hardware Setup
  5. 3Schematic
  6. 4Board Layouts
    1. 4.1 Bill of Materials
  7. IMPORTANT NOTICE
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EVM USER'S GUIDE

DRV5825P Evaluation Module User's Guide

Abstract

This user's guide describes the characteristics, operation, and use of the DRV5825P evaluation module (EVM). TI provides a GUI through PurePath™ Console 3 (PPC3) Smart Piezo Driver configuration. The main contents of this document are:

  • Hardware descriptions and implementations
  • Quick Start of the PPC3™ application
  • Schematic diagram
  • Bill of Materials

Required equipment and accessories:

  • DRV5825P EVM
  • USB micro type-B cable
  • Power supply unit (PSU) 5–14 A, 12–30 VDC
  • Two 2- to 8-Ω piezoelectric actuators or resistor loads (ensure load is appropriately sized for required wattage output) and cables
  • Small screwdriver
  • Desktop or laptop running Microsoft®Windows® 7 or later
  • Audio source
    • Sony/Philips Digital Interface (S/PDIF) source (DVD, audio converter, Audio Precision (AP®))
    • Playback media from Microsoft Windows 7 or later
    • 3-mm audio jack analog output

Trademarks

PPC3™ is a trademark of Texas Instruments.

Microsoft®, Windows®, and Windows Media® are registered trademarks of Microsoft Corporation.

AP® and Audio Precision (AP)® are registered trademarks of Audio Precision, Inc..

All trademarks are the property of their respective owners.

1 Hardware Overview

The DRV5825P showcases the latest TI digital input Class-D closed-loop amplifier for Piezo applications. The DRV5825P is a digital input Class-D audio amplifier with Smart Piezo Driver Algorithm.

GUID-20200731-CA0I-XXCN-QT4B-BNQ1L5BKHPGT-low.png Figure 1-1 DRV5825PEVM (Top Side)
GUID-20200731-CA0I-Q2F3-LWQ3-ZQ8LCK3R1FG1-low.png Figure 1-2 DRV5825PEVM (Bottom Side)

Features

The EVM has the following features:

  • Two DRV5825P devices: 2.0 stereo, 1.0 mono, 2.1 and 2.2 capable
  • Operates in BTL and PBTL
  • Flexible audio source input (USB, S/PDIF, PSIA, and analog)
  • Demonstration, evaluation and development via the PPC3™ application

Functions

The DRV5825PEVM has several audio source options. The digital audio data input is selectable from USB audio, optical S/PDIF, and PSIA (external I2S). There is also an analog audio input to the DRV5825PEVM through 3-mm audio jack. The DRV5825PEVM also functions as an optical output source (labeled on the board as OPTO OUT U6) as Figure 1-1 shows. The output of the DRV5825PEVM can either be configured in BTL or PBTL through the load connections to OUT1 (J12), OUT2 (J15), OUT3 (J18), and OUT4 (J21) shown in Figure 1-1.

Detailed Operations

The DRV5825PEVM has four different optional audio sources:

  1. If the XMOS is selected manually by toggling the S1 switch, the Windows Media® Player can be used to stream audio. GPIO1 SEL (J5) should be configured to XMOS as Figure 1-1 (board view) or Figure 3-2 (schematic view) show.
  2. If S/PDIF is selected manually by toggling the S1 switch, an optical S/PDIF source (DVD, audio converter, or AP) can be used to stream audio from the OPTO IN connector (U8). GPIO1 SEL (J5) should be configured for S/PDIF as seen in Figure 1-1 (board view) or Figure 3-2 (schematic view).
  3. If an external digital audio source, such as a Programmable Serial Interface Adapter (PSIA) from Audio Precision (AP)® is desired, the jumpers on the BYPASS selection of LRCLK (J8), SCLK (J7), and SDIN (J9) may be removed as Figure 1-1 (board view) or Figure 3-3 (schematic view) show. The PSIA inputs may be connected to the PSIA selection with the appropriate ground reference aligned with the ground signal on the board.
  4. If the audio source is analog, it may input from the 3-mm audio jack as Figure 1-1 (board view) or Figure 3-2 (schematic view) show.

Both 3.3 V and 1.8 V DVDD and IOVDD are supported with the DRV5825PEVM. Jumper (J10) can be used to select accordingly based on the requirement of the digital signals to closely mimic the end equipment of the customer as Figure 1-1 (board view) or Figure 3-3 (schematic view) show. PVDD and DVDD of each device may be removed with the corresponding jumpers in Table 1-1:

Table 1-1 Power Supplies per DRV5825P Device
Device PVDD DVDD
U18 (Top - OUT1 and OUT2) J11 DVDD2 (J14)
U21 (Bottom OUT3 and OUT4) J17 DVDD1 (J21)

The USB connection is also used to provide I2C communications with DRV5825P on the EVM. The EVM provides selection of providing external I2C is the use of the GUI/XMOS is not desired through SDA (J2) and SCL (J1) as seen in Figure 1-1 (board view) or Figure 3-1 (schematic view). The PPC3™ application for this device is used to initialize and operate this EVM.

2 Hardware Setup

Use the following steps when setting up the hardware:

  1. Connect the piezo speakers (or equivalent load) to the DRV5825PEVM.

  2. Connect a PSU to the DRV5825PEVM to PVDD (J23) and GND (J24) between 4.5 V and 26.4 V. The 5-V and 3.3-V LEDs (Yellow) should illuminate and the USB Lock LED (Blue) should also be illuminated.

  3. Plug in a USB cable from the computer with the PPC3™ GUI to the EVM.

  4. If an optical S/PDIF source is used, the blue S/PDIF clock-locked LED is illuminated, S1 should be toggled to S/PDIF.

I2C Device Address

The default I2C addresses on the EVM are set to 0x98 for top device (U18) and 0x9A for the bottom device (U21).

Board-Level Troubleshooting

It is suggested to perform a power cycle, disconnect both the USB cable and the power supply from the board. To make sure the devices are properly initialized, TI recommends checking if the output is switching (square wave).

When XMOS is chosen as the audio source, the Windows 10 OS may have issues recognizing the correct USB audio driver.

Follow these steps to ensure the correct USB audio driver:

  1. Navigate to Control Panel\All Control Panel Items

  2. Select "Sound "

  3. Under the "Playback" tab

    1. Right-click on "TI USB Audio UAC2.0"

    2. Select "Properties"

  4. Navigate to the "Advanced" tab

    1. Ensure the "Default Format" is "24 bit, 48000 Hz (Studio Quality)"

    2. If the "Advanced" tab is not found, this is the incorrect driver.

Follow this set of steps to attain the correct USB audio driver:

  1. Change to another USB of the computer, follow the previously-listed steps to see if this resolves the issue. If not, please continue to the following step.

  2. To have the correct USB audio driver recognized by the computer:

    1. Navigate to "Device Manager".

    2. Expand "Sound, video and game controllers"

    3. Right click on "TI USB Audio UAC2.0"

      1. Select "Uninstall Device"

    4. Unplug USB and re-plug in the USB into the computer. This will allow the correct driver to be recognized by the computer.

Last but not least, ensure that the computer audio source: "Speakers (TI USB Audio UAC2.0)" is set to 100%.

 
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