Texas Instruments LP5861T User manual

EVM User's Guide: LP5861TEVM
LP5861T Evaluation Module
Description
The LP5861T Evaluation Module showcases all the
features of the LP5861T LED matrix driver. The
graphical user interface or GUI called LP586x GUI
is used to interface with USB2ANY to the EVM. The
EVM has SPI and I2C inputs through the USB2ANY
interface adapter.
Get Started
1. Order the EVM on ti.com
2. Request the LP5861T data sheet
3. Download the LP586xGUI from ti.com
4. Request the EVM design files
Features
• LP5861T 18-channel high-current LED driver with
8-Bit analog and 8-Bit or 16-Bit PWM dimming
• SPI, I2C, Vsync, IFS, EN signal input from
USB2ANY interface adapter
• LP586x GUI is used to control the EVM
Applications
• Major and smart home appliance
• IR module for video surveillance and IP camera
• Laser diode in optical module
• Smart speaker
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1 Evaluation Module Overview
1.1 Introduction
This user’s guide describes the characteristics, setup, and usage of the LP5861T evaluation module (EVM).
The LP5861TEVM helps the user evaluate the features of the Texas Instruments LP5861T LED linear driver,
which integrates 18 constant current sinks. This user’s guide includes hardware setup instructions, graphical
user interface (GUI) instructions, printed-circuit board (PCB) layout drawings, a schematic diagram, and the bill
of materials.
The LP5861TEVM is used to evaluate the characteristics, operation, and usage for LED linear driver LP5861T.
The LP5861T device is a high performance and small-size device, which integrates 18 constant current sinks
to drive up to 18 LED dots or 6 RGB LEDs. Every LED dot is supported by 8-bit analog dimming and 8-bits or
16-bits configurable PWM dimming methods, which enable smooth and audible-noise-free dimming control.
This document covers the following topics:
•How to set up the LP5861TEVM hardware
•How to use the LP586x GUI to illuminate LEDs
•Design resources for the LP5861TEVM
The LP5861TEVM can be converted for testing the LP5861, which are from the same device family, by removing
the factory-installed device (U1) and replacing with the LP5861 counterpart. When testing the LP5861 device,
select the corresponding tag from the menu on the GUI start page to start evaluation.
1.2 Kit Contents
The LP5861TEVM kit includes the following materials and is illustrated in Figure 1-1.
• LP5861T evaluation module
• USB2ANY interface adapter with ribbon cables and USB cable
Figure 1-1. LP5861TEVM Kit
Full functions for the LP5861T, the performance with RGB LEDs, and some simple animation effects can be
easily verified through this kit.
1.3 Specification
The evaluation module provides several inputs. The inputs are I2C, SPI, Vsync, EN, IFS signal input and power
supplies for VCC, VLED. External power supply is needed when total current is larger than 400 mA.
1.4 Device Information
The LP5861TEVM showcases the hardware and software capabilities of the LP5861T 18-Channel High-Current
LED Driver with 8-Bit Analog and 8-Bit or 16-Bit PWM Dimming. This module can be used for evaluation and for
system development utilizing the LP586x GUI application.
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2 Hardware
This following chapters describe how to set up the LP5861TEVM properly. Items from the following list are
required to begin evaluating the LP5861T:
• Computer
• LP5861TEVM
• USB2ANY interface adapter
2.1 Hardware Setup
In the default jumper setting, the board can be evaluated by USB power directly and does not need an external
power supply. Setup connection is demonstrated in Figure 2-1. The setup procedure is as follows:
1. Connect the USB2ANY with the LP5861TEVM using the 30-pin ribbon cable.
2. Plug the USB cable into the USB port on the computer.
USB2ANY LP5860TEVM
USB Cable
Ribbon Cable
Figure 2-1. Hardware Connection
Figure 2-2 shows the default jumper settings.
Figure 2-2. Default Jumper Setting
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If maximum current is set above 20 mA, then an external VLED supply is recommended during evaluation since
the USB can only provide around 400-mA current. The setup procedure is as follows:
1. Connect the USB2ANY to the LP5861TEVM using the 30-pin ribbon cable.
2. Connect a 5-V external power supply to the VLED_EXT terminal (see Figure 2-3) and connect the switching
jumper (J1) to another side.
3. Plug the USB cable into the USB port on the computer.
Figure 2-3. Key External Connectors
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3 Software
The following sections describe how to set up the GUI properly. Items from the following list are required to begin
evaluating the LP5861T:
• LP586x GUI software
3.1 Software Setup
Download the LP586x GUI installation package from the LP5861T product folder. Follow the setup wizard to
install the LP586x GUI successfully, see Figure 2-4.
Figure 3-1. GUI Installation
3.2 Graphical User Interface (GUI) Guidance
The LP586x GUI is a convenient tool to control and evaluate all functions of LP586x family. Open the
LP586x.exe file and plug the USB cable into the USB port of the computer. The GUI automatically connects
with the LP5861TEVM. Figure 3-1 illustrate the status bar showing the connection status at the bottom of GUI.
Hardware Connected shows in the status and the indicator in the USB2ANY stops blinking when successfully
connected. Click the connection button to connect or disconnect the LP5861TEVM with the GUI.
Connection button Connection status
Log panel
Figure 3-2. Status Bar
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If the USB2ANY has been used to evaluate other EVMs and updated by other firmware version (like 2.8.2.0),
then the correct firmware version must be updated into USB2ANY. Following the instructions showed in the GUI
when plugging in the USB cable can update the FW successfully, see Figure 3-2.
Figure 3-3. Firmware Update
If the USB2ANY has not been previously used to evaluate any EVM before, an unknown version firmware is
detected by GUI. When the update firmware notification shows up, 1) Unplugging the USB cable (do not click the
UPDATE button); 2) Pressing the BSL button inside USB2ANY, then plug in the USB cable; 3) Clicking UPDATE
button, see Figure 3-3.
Figure 3-4. Firmware Update
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3.2.1 Start Page
Different device variants in the LP586x family are selected from the Start Page. To begin evaluation, because we
only have LP5861 option in the start page, considering LP5861 and LP5861T have same register configuration,
so select the LP5861 tab then click the EXPLORE button to begin evaluation, see Figure 3-3.
Note
The different between LP5861 and LP5861T is LP5861T has larger output current than LP5861 at
same MC configuration, so please chose the related value when select maximum current. See more
details on Device Configuration section.st
Figure 3-5. Start Page
3.2.2 Home Page
Figure 3-4 shows the interface protocol selected in the Home page. Click the Configure & Connect button to
connect the USB2ANY with the LP5861TEVM. The I2C protocol with 0x10 chip address is the default. Other
addresses with 0x11, 0x12, and 0x13 and SPI are also available.
Click the START button below the LED CONTROL block to set current and PWM for every individual LED.
Other configurable functions can also be set through graphical buttons in this page. Predefined animations are
performed with the PATTERN page while every individual register is configured in the REGISTER MAP page.
Figure 3-6. Home Page
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3.2.3 LED Control Page
Set the color and brightness for every RGB LED pixel in the LED control page. To illuminate one LED with
default configuration, use the following procedure and see Figure 3-5.
1. Click the Enable button to enable the LP5861 in the software.
2. Select the LED you want to control.
3. Set a color for this LED.
4. Click the Set Brightness button to upload PWM value into the device.
5. Click the VSync button to active this LED (The default is Mode 3 so the SYNC signal is necessary).
Figure 3-7. LED Control Page and Test Procedure
Device Configuration
To improve performance under different applications, first configure some key settings. Select the DEVICE
CONFIGURATION button to show the detail setting slide, which is illustrated in Figure 3-6. Maximum current
(MC) is set here. Please note: if LP5861T is under test, then the Global Maximum Current setting is: 7.5mA,
12.5mA, 25 mA, 37.5mA, 50 mA, 75 mA, 100 mA, 125 mA related to each button (000 - 111 for bit3 - bit1
in Dev_config3 register) under Global Maximum Current setting. Therefore, if 15 mA is chosen on Device
Configuration page, then the actual value for LP5861T maximum current is 37.5mA. If a high maximum current
is set, then an external VLED supply is recommended. The Data Refresh Mode settings determine whether a
SYNC signal is required to synchronize the PWM change for every LED dot. The Max Scan Lines controls select
how many scan lines are active. For more information on the functions for other settings, see the LP5861T
18-Channel High-Current LED Driver with 8-Bit Analog and 8-Bit or 16-Bit PWM Dimming.
Note that for LP5861T/LP5861, only one scan line is available.
Evaluating de-ghosting and low brightness compensation are configured here.
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Figure 3-8. Device Configuration
Custom LED Setting
Before setting color and brightness for RGB LED, one or multiple LEDs (Shift + select for multiple LED
selections) must first be selected. In the CUSTOM tag, set the color in color selector on the right side, see
Figure 3-7. Brightness is used to adjust the PWM for all 3 dots in one RGB LED. For some high requirement
applications, dot current can adjust white balance for every RGB LED.
Figure 3-9. Custom Setting
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Global and Group Setting
Figure 3-8 illustrates the GLOBAL tab where color current for RGB groups and global PWM for all LED dots are
set. Figure 3-9 illustrates the GROUP tab where every LED dot can be configured to three groups arbitrarily,
while the PWM for the same group can be changed synchronously.
Figure 3-10. Global Setting
Figure 3-11. Group Setting
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