Texas Instruments LP5012EVM User manual

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LP5012EVM User's Guide
User's Guide
SNVU650–May 2019
LP5012EVM User's Guide
This user’s guide describes the characteristics, setup, and use of the LP5012EVM evaluation module
(EVM). The LP5012EVM helps the user evaluate the features of the Texas Instruments LP5012 device,
which is an I2C bus-controlled, 12-channel, constant-current LED driver. This user’s guide includes setup
instructions, a schematic diagram, a bill of materials, printed-circuit board layout drawings, and software
instructions.
The LP5012EVM can be converted for testing the LP5009 device by removing the factory-installed device
(U1) and replacing it with the LP5009 counterpart. When testing the LP5009 device, select the
corresponding LP5009 tag from the menu on the GUI home page (Figure 5) for the evaluation.
Contents
1 What You Get ................................................................................................................ 2
2 What You Need In Addition ................................................................................................ 4
3 How to Get Started .......................................................................................................... 4
4 Board Layout................................................................................................................ 15
List of Figures
1 LP5012EVM Kit.............................................................................................................. 2
2 LP5012EVM Key Connectors.............................................................................................. 3
3 LP5012EVM Hardware Setup.............................................................................................. 4
4 LP5012EVM USB Cable Direction ........................................................................................ 5
5 LP50 Family GUI Home Page ............................................................................................. 6
6 Landing Page of LP5012EVM GUI........................................................................................ 6
7 LED Control Panel........................................................................................................... 7
8 LP50 EVM GUI Connection Status........................................................................................ 8
9 LP50xx Global Setting ...................................................................................................... 9
10 LED Color and Brightness Setting ....................................................................................... 10
11 Bank Management Entry.................................................................................................. 11
12 Bank Setting ................................................................................................................ 11
13 LED Lighting Pattern ...................................................................................................... 12
14 Register Map................................................................................................................ 13
15 Tool Bar ..................................................................................................................... 14
16 Top Layer Routing ......................................................................................................... 15
17 Bottom Layer Routing (Mirrored)......................................................................................... 16
18 LP5012EVM Schematic Diagram ........................................................................................ 17
List of Tables
1 LP5012EVM Parameters ................................................................................................... 3
2 Bill of Materials (BOM)..................................................................................................... 18
Trademarks
All trademarks are the property of their respective owners.

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1 What You Get
The LP5012EVM kit (Figure 1) contains:
• USB2ANY
– Ribbon cable
– USB cable
• LP5012EVM
Figure 1. LP5012EVM Kit

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Figure 2 shows the key connectors used to operate LP5012EVM.
Figure 2. LP5012EVM Key Connectors
Table 1. LP5012EVM Parameters
PARAMETER RANGE
VCC 3 V–5.5 V
VLED 3 V–5.5 V
VMCU 1.8 V, 3.3 V, 5 V
Channel current 35 mA (maximum)
Note: Channel current is set at 20 mA when the LED supply voltage is 5 V. Although the LP5012 device
can withstand 6-V maximum LED supply voltage with 35 mA per channel, make sure that the PCB thermal
performance can meet the power dissipation requirement, because increased LED supply voltage
increases channel output current.

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2 What You Need In Addition
A PC on which to install the LP50EVM GUI (click here to download software)
DC supply
3 How to Get Started
3.1 Hardware Setup
Figure 3 shows the hardware setup of the LP5012EVM.
• Connect a 5-V power supply to TP1 (VIN_EXT) and TP6 (GND).
• Using the USB cable, connect the USB2ANY module to the PC.
• Using the ribbon cable, connect the USB2ANY module to the LP5012EVM.
Figure 3. LP5012EVM Hardware Setup

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Figure 4. LP5012EVM USB Cable Direction
3.2 Software Installation
Download the GUI software from the product folder. After downloading, install the LP50EVM GUI on the
PC. A shortcut to the GUI will be found on the desktop. A shortcut can also be found in the startup menu
under the Texas Instruments folder. Figure 6 shows the landing page of the LP50EVM GUI. The landing
page contains the LP50xx introduction information and LP5012EVM information. Clicking the menu icon
(≡) shows more information.

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Figure 5. LP50 Family GUI Home Page
Figure 6. Landing Page of LP5012EVM GUI

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3.3 GUI Function
Click the Quick Start button in the lower-right corner. The GUI displays a detailed LED control panel as
shown in Figure 7.
Figure 7. LED Control Panel

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3.3.1 Connection Status
Before using the GUI, make sure the connection status indicator at the bottom left corner is green, which
means the USB2ANY is connected to the computer successfully. If the status indicator is red, try to
reconnect the USB2ANY cable and restart the LP50EVM GUI.
Figure 8. LP50 EVM GUI Connection Status

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3.3.2 GUI Functions
3.3.2.1 Global Setting
When all the LED outputs are inactive, the LP50xx device is able to enter power-save mode automatically,
thus lowering idle-current consumption down to 10 μA (typical). The automatic power-save mode is
enabled when register bit Power_Save_EN = 1 (default) and all the LEDs are off for a duration of > 30 ms.
Almost all analog blocks are powered down in power-save mode. If any I2C command to the device
occurs, the LP50xx device returns to the NORMAL mode. Set the Power Saver switch to activate the
function (see Figure 8).
Figure 9. LP50xx Global Setting

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3.3.2.2 RGB LED Color and Intensity Control
Each output channel has its own individual 8-bit color-setting register (OUTx_COLOR). The device allows
every RGB LED module to achieve > 16 million (256 × 256 × 256) color-mixing. When color is fixed, the
independent intensity control, formerly called brightness control, is used to achieve accurate and flexible
dimming control for every RGB LED module. Every three consecutive output channels are assigned to
their respective intensity-control register (LEDx_BRIGHTNESS). The LP50xx device allows 256-step
intensity control for each RGB LED module, which helps achieve a smooth dimming effect. For human-
eye-friendly visual performance, a logarithmic-scale dimming curve is usually implemented in LED drivers.
The LP50xx device, with independent color-mixing and intensity-control registers, implements the
logarithmic scale dimming control inside the intensity control function, which solves the color distortion
issue effectively. Also, the LP50xx device allows users to configure the dimming scale either
logarithmically or linearly through the global Log_Scale_EN register. Click the Manage button, shown in
Figure 10. to set the color and brightness.
Figure 10. LED Color and Brightness Setting
3.3.2.3 Bank Management
For most LED-animation effects, like blinking and breathing, all the RGB LEDs have the same lighting
pattern. Instead of controlling the individual LED separately, which occupies the microcontroller resources
heavily, the LP50xx device provides an easy coding approach, the LED bank control. Each channel can
be configured as either independent control or bank control through the LEDx_Bank_EN register. When
LEDx_Bank_EN = 0 (default), the LED is controlled independently by the related color-mixing and
intensity-control registers. When LEDx_Bank_EN = 1, the LP50xx device drives the LED in LED bank-
control mode. The LED bank has its own independent PWM control scheme, which is the same structure
as the PWM scheme of each channel. See the register map Figure 14 for more details. When a channel is
configured in LED bank-control mode, the related color mixing and intensity control is governed by the
bank control registers (BANK_A_COLOR, BANK_B_COLOR, BANK_C_COLOR, and
BANK_BRIGHTNESS) regardless of the inputs on its own color-mixing and intensity-control registers.

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Figure 11. Bank Management Entry
Figure 12. Bank Setting

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3.3.3 Lighting Patterns
The GUI also can run the preset lighting patterns and customize the lighting pattens by modifying some
parameters.
Figure 13. LED Lighting Pattern

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3.3.4 Register Map
The register view appears when the Register icon in Figure 14 is clicked. The register view provides the
register values, field values, and descriptions. The registers can be operated directly through the input
check box.
Figure 14. Register Map
Enter the desired hex value in the registers (Value column), perform a bit-wise configuration of any
register fields by double-clicking on the corresponding register bit, or configure a register field by entering
the desired value as hex in the Value column, binary in the Bits columns, or by using the input boxes for
each field under FIELD VIEW to set values for the corresponding variables. Field View displays the
description of all fields of the selected register. Each register can be read independently or all registers
can be read at once by using the Read Register or Read All Registers button, respectively. The data is
written to the registers in one of two ways, depending on the update mode (Immediate↓or Deferred↓)
button. Clicking the button toggles between the two modes. In Immediate mode, the register data is written
immediately following a Current Value , an individual bit, or a Value change. In Deferred mode, the
displayed data is written to all registers on depression of the Write Register button. Press the Read All
Registers button to read back all the registers and update the values in this table. If any register value
must be changed, simply double-click on the individual bit values to change the value in this table in
immediate updated mode or press the Write Register button to write all the registers at a time if Deferred
is selected instead of Immediate from the drop-down box. Register settings can be saved in text-file format
by selecting Save Registers from the file menu. A register settings file in text-file format can be loaded and
programmed automatically by selecting Load Register from the file menu.

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3.3.5 Tool Bar
Registers can be loaded and saved through the tool bar under the File menu.
Figure 15. Tool Bar

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4 Board Layout
Figure 16. Top Layer Routing

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Figure 17. Bottom Layer Routing (Mirrored)

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4.1 Schematic
Figure 18. LP5012EVM Schematic Diagram

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4.2 Bill of Materials
Table 2. Bill of Materials (BOM)
DESIGNATOR QT
YVALUE DESCRIPTION PART NUMBER MANUFACTURER
C1 1 10 µF CAP, CERM, 10 µF, 6.3 V, +/- 10%,
JB, 0603 C1608JB0J106K080AB TDK
C2, C3 2 1 µF CAP, CERM, 1 µF, 25 V,+/- 10%,
X7R, 0603 06033C105KAT2A AVX
C4 1 0.1 µF CAP, CERM, 0.1 µF, 16 V,+/- 5%,
X7R, 0603 0603YC104JAT2A AVX
D1, D2, D3, D4 4 Rgb LED, RGB, SMD KRTB HFLP71.32 OSRAM
H1, H3, H5, H7 4 Standoff, Hex, 0.5"L #4-40 Nylon 1902C Keystone
H2, H4, H6, H8 4 Machine Screw, Round, #4-40 x 1/4,
Nylon, Philips panhead NY PMS 440 0025 PH B&F Fastener Supply
J1, J2, J3, TP4 4 Header, 100mil, 2x1, Gold, TH TSW-102-07-G-S Samtec
J4 1 Header, 100mil, 12x2, Gold, TH TSW-112-07-G-D Samtec
J5 1 Header, 100mil, 4x2, Gold, TH TSW-104-07-G-D Samtec
J6, J8 2 Header, 100mil, 3x1, Gold, TH TSW-103-07-G-S Samtec
J7 1 Header, 100mil, 5x2, Gold, R/A, TH TSW-105-08-G-D-RA Samtec
J9 1 Header, 100mil, 3x2, Gold, TH TSW-103-07-G-D Vishay-Dale
R1, R2, R3 3 4.7k RES, 4.7 k, 5%, 0.1 W, 0603 CRCW06034K70JNEA Yageo America
R4 1 3.57k RES, 3.57 k, 1%, 0.1 W, 0603 RC0603FR-073K57L Sullins Connector
Solutions
SH1, SH2, SH3,
SH4, SH5, SH6,
SH7, SH8, SH9,
SH10, SH11, SH12,
SH13, SH14, SH15,
SH16, SH17, SH18,
SH19, SH20
20 1 × 2 Shunt, 100mil, Flash Gold, Black SPC02SYAN Sullins Connector
Solutions
TP1, TP6, TP7, TP8 4 Terminal, Turret, TH, Double 1502-2 Keystone
TP2 1 Test Point, Miniature, Red, TH 5000 Keystone
TP3 1 Test Point, Miniature, Black, TH 5001 Keystone
U1 1 12-Channel I2C Constant Current
RGB LED Driver, RUK0020B
(WQFN-20)
LP5012RUKR Texas Instruments

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