Texas Instruments LP8866EVM Manuale utente

SNVU685A–December 2019–Revised June 2020

LP8866EVM User's Guide

User's Guide

SNVU685A–December 2019–Revised June 2020

LP8866EVM User's Guide

The Texas Instruments LP8866EVM evaluation module helps designers to evaluate the operation and

performance of the LP8866-Q1 device. This document includes a hardware setup instructions, software

instructions, a complete schematic diagram, printed-circuit board (PCB) layout, and bill of materials (BOM)

of the LP8866EVM.

Contents

1 Introduction ................................................................................................................... 2

2 Test Setup .................................................................................................................... 2

3 LP8866EVM Board Layout................................................................................................ 10

4 LP8866EVM Schematic ................................................................................................... 11

5 LP8866EVM Bill of Materials ............................................................................................. 12

6 LED Load Board............................................................................................................ 15

List of Figures

1 LP8866EVM Kit.............................................................................................................. 3

2 LP8866EVM Hardware Setup.............................................................................................. 4

3 LP8866/4 Family GUI Landing Page...................................................................................... 5

4 LP8866EVM GUI Home Page ............................................................................................. 5

5 LP8866EVM LED Control Page ........................................................................................... 6

6 LP8866EVM Monitor Faults Page......................................................................................... 7

7 LP8866EVM Diagnostics Page ............................................................................................ 8

8 LP8866EVM Register Map Page.......................................................................................... 9

9 LP8866EVM Layout - Top ................................................................................................ 10

10 LP8866EVM Layout - Bottom............................................................................................. 10

11 LP8866EVM Schematic ................................................................................................... 11

12 LP886X-LEDLOAD-EVM Schematic..................................................................................... 15

List of Tables

1 LP8866EVM Bill of Materials ............................................................................................. 12

2 LP886X-LEDLOAD-EVM Bill of Materials............................................................................... 15

Trademarks

All trademarks are the property of their respective owners.

Introduction

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LP8866EVM User's Guide

1 Introduction

The LP8866EVM helps designers to evaluate the characteristics, operation, and use of the LP8866-Q1

device, a high-performance LED driver for automotive lighting. The LP8866-Q1 device is a high-efficiency

LED driver with boost controller. The six 200-mA high-precision current sinks support phase shifting that is

automatically adjusted based on the number of channels in use. LED brightness can be controlled globally

through the I²C interface or PWM input.

1.1 Features

The EVM has the following features:

• Up to 48-V Vout boost controller

• Six high-precision current sinks

• Supports built-in phase-shift PWM dimming, hybrid dimming, current dimming and direct PWM

dimming mode

• LED brightness controlled globally through I2C interface or PWM input

• Extensive fault diagnostics

1.2 Applications

Backlight for:

• Automotive infotainment

• Automotive instrument clusters

• Smart mirrors

• Heads-Up Displays (HUD)

• Central Information Displays (CID)

• Audio-Video Navigation (AVN)

2 Test Setup

This section describes how to properly connect and setup the LP8866EVM.

2.1 The LP8866EVM Kit

The LP8866EVM kit contains (see Figure 1):

• USB2ANY

– Ribbon cable

– USB cable

• LP8866EVM

• LP886X-LEDLOAD-EVM

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Test Setup

SNVU685A–December 2019–Revised June 2020

LP8866EVM User's Guide

Figure 1. LP8866EVM Kit

2.2 System/Equipment Requirements

• DC power supply: 24 V or higher, 6 A or higher

• LED cable: 7-position ribbon cable

• PC to run GUI software

• GUI software

2.3 Hardware Setup

Figure 2 shows the hardware setup of the LP8866EVM.

• Connect a 12-V external power supply between the power input terminals VBAT+ and GNDin on the

LP8866EVM.

• Connect the USB2ANY module to the PC with the USB cable.

• Connect the USB2ANY module to the LP8866EVM with the provided ribbon cable.

• Connect the LP8866EVM to the LP886X-LEDLOAD-EVM with a 7-position ribbon cable.

Test Setup

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LP8866EVM User's Guide

Figure 2. LP8866EVM Hardware Setup

2.4 Software Installation

Download the GUI software from the LP8866EVM tools folder. Follow the instructions to finish the GUI

installation. Once installed, a shortcut to the GUI is found on the desktop and also in the start-up menu

under the Texas Instruments folder.

2.5 Quick Start-Up Procedure

1. After the hardware is connected successfully, run the GUI software. Turn on the 12-V external power

supply. Select the right device variant of the EVM, which is LP8866, as shown in Figure 3.

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Test Setup

SNVU685A–December 2019–Revised June 2020

LP8866EVM User's Guide

Figure 3. LP8866/4 Family GUI Landing Page

2. Check the connection status button on the bottom left corner of the GUI. The button should be like the

one shown in Figure 3. There should be a "Hardware connected" message on the status bar next to the

button. If it shows "Hardware not Connected", click the button to connect to hardware manually. This

button can be used to connect or disconnect the GUI to the hardware during the evaluation.

3. Click "EXPLORE LP8866" to go to the LP8866EVM GUI home page (see Figure 4).

Figure 4. LP8866EVM GUI Home Page

Test Setup

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LP8866EVM User's Guide

4. Click "Start" to go to the LED Control page (see Figure 5). On the LED Control page, the user can

control all the register based control functions of the device, like brightness control, current control, sloper

control, dither control, boost synchronization configuration and spread spectrum configuration.

Figure 5. LP8866EVM LED Control Page

2.6 Additional GUI Functions

In the selection tab on the left-hand side, the user can switch between LED Control, Monitor Faults,

Diagnostics and Register Map tabs. This section introduces GUI functions provided in the Monitor Faults,

Diagnostics and Register Map tabs.

2.6.1 Monitor Faults Page

From the Monitor Faults page (see Figure 6), the user has access to LP8866-Q1 fault status bits. Faults

can be cleared by software by clicking the "Clear All" button. Fault interrupt can be enabled or disabled

globally by toggling the "Interrupt All" button. Besides that, each fault interrupt and each fault status can be

controlled individually.

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Test Setup

SNVU685A–December 2019–Revised June 2020

LP8866EVM User's Guide

Figure 6. LP8866EVM Monitor Faults Page

2.6.2 Diagnostics Page

From the Diagnostics page (see Figure 7), the user can read back the following diagnostics register

values and corresponding device status.

• FSM_LIVE_STATUS: current status of the functional state machine

• PWM_INPUT_STATUS: 16-bit value for detected duty cycle of PWM input signal

• PWM_OUTPUT_STATUS: 16-bit value for configured duty cycle of PWM output signal

• LED_CURRENT_STATUS: 12-bit current DAC code that brightness path is driving to OUT1-6 output

• VBOOST_STATUS: 11-bit boost voltage code that adaptive voltage control loop sending to analog

boost block

• AUTO_PWM_FREQ_SEL: LED PWM frequency value from PWM_SEL resistor detection

• AUTO_LED_STRING_CFG: LED string configuration from LED_SET resistor detection

• AUTO_BOOST_FREQ_SEL: boost switching frequency value from PWM_FSET resistor detection

• MODE_SEL: LED dimming mode value from MODE resistor detection

Test Setup

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LP8866EVM User's Guide

Figure 7. LP8866EVM Diagnostics Page

2.6.3 Register Map Page

Figure 8 shows the registers map page. All the registers are available on this page. When "Auto Read" is

set to other than "Off", all the registers will be read automatically and periodically according to the interval

time the user selects. Otherwise the user will need to click "READ REGISTER" to read the selected

Clicking on the row of a register automatically updates the corresponding field view on the right side of the

page. The register value can be updated by modifying the hexadecimal value in the "Value" column or by

double-clicking the corresponding bit in the "Bits" column. The modified value is effective immediately if

"Immediate Write" is selected. When "Deferred Write" is selected, the modified value won't take effect until

the user clicks "WRITE REGISTER" button. All registers' value can be updated together by clicking

"WRITE ALL REGISTERS".

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Test Setup

SNVU685A–December 2019–Revised June 2020

LP8866EVM User's Guide

Figure 8. LP8866EVM Register Map Page

2.7 Instructions for Standalone Evaluation

The LP8866EVM can be used for standalone evaluation (without GUI software and PC connection). To

support standalone mode, it must be modified from its default settings as described below:

1. Mount R20 to pull up EN input.

2. Change pullup and pulldown resistors to select spread spectrum enable (R18) or disable (R25) option.

3. Mount R19 to pull up PWM input for 100% brightness. If brightness needs to be changed from 100%,

connect external PWM source at PWM pin.

The minimum procedures for turning on the LEDs after modifications above are as follows:

1. Connect a 12-V external power supply between the power input terminals VBAT+ and GNDin on the

LP8866EVM.

2. Connect LP886X-LEDLAOD-EVM board (6 strings, 8 LEDs per string) to J10 on the LP8866EVM.

3. Turn on the external power supply.

LP8866EVM Board Layout

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LP8866EVM User's Guide

3 LP8866EVM Board Layout

Figure 9 and Figure 10 illustrate the EVM board layout.

Figure 9. LP8866EVM Layout - Top

Figure 10. LP8866EVM Layout - Bottom

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