Texas Instruments LM36923HEVM Manuale utente

Using the LM36923HEVM Evaluation Module

User's Guide

Literature Number: SNVU509

January 2016

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Table of Contents

Contents

1 Introduction......................................................................................................................... 5

2 Setup.................................................................................................................................. 6

2.1 Input/Output Connector Description ................................................................................... 6

2.2 Setup....................................................................................................................... 7

2.3 Operation.................................................................................................................. 7

3 Board Layout....................................................................................................................... 8

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

5 USB Interface Board and I2C-Compatible Interface Program.................................................... 13

5.1 User Interface ........................................................................................................... 13

5.2 LM36923H Software Reset............................................................................................ 14

5.3 LM36923H Fault Flags................................................................................................. 15

5.4 PWM Pin Control ....................................................................................................... 16

5.5 ASEL Pin Control....................................................................................................... 17

5.6 History & Macro Tab ................................................................................................... 18

5.7 Individual register read/write access ................................................................................. 19

5.8 Macro Example ......................................................................................................... 20

5.9 Updating USB2ANY Firmware........................................................................................ 23

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List of Figures

1 LM36923HEVM Photo ...................................................................................................... 5

2 VIO Jumper Settings ........................................................................................................ 6

3 ASEL Jumper Settings...................................................................................................... 6

4 OUT Jumper Settings ....................................................................................................... 7

5 HL1, HL2, HL3 star jumper configuration settings....................................................................... 7

6 Jumper Configuration ....................................................................................................... 8

7 Top Assembly Layer......................................................................................................... 9

8 Middle Layer 1 Routing ..................................................................................................... 9

9 Middle Layer 2 Routing.................................................................................................... 10

10 Bottom Assembly Layer (MIRRORED).................................................................................. 10

11 LM36923EVM Schematic ................................................................................................. 11

12 LM36923H General User Interface ...................................................................................... 13

13 LM36923H Software Reset .............................................................................................. 14

14 Fault Flags .................................................................................................................. 15

15 PWM Input Pin Control .................................................................................................... 16

16 ASEL Input Pin Control.................................................................................................... 17

17 GUI History following Read All button clicked.......................................................................... 18

18 Register read/write access................................................................................................ 19

19 Example macro............................................................................................................. 20

20 Example macro loaded (tool tip enabled)............................................................................... 21

21 Example macro message box............................................................................................ 22

22 USB2ANY firmware unknown update ................................................................................... 23

23 USB2ANY firmware update step 1....................................................................................... 23

24 USB2ANY firmware update step 2 ...................................................................................... 24

25 USB2ANY firmware update complete .................................................................................. 24

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List of Tables

1 Device and Package Configurations ...................................................................................... 5

2 Bill of Materials ............................................................................................................. 12

3 Macro commands .......................................................................................................... 20

SNVU509–January 2016

LM36923HEVM User's Guide

User's Guide

SNVU509–January 2016

LM36923HEVM User's Guide

1 Introduction

The Texas Instruments LM36923HEVM evaluation module (EVM) helps designers evaluate the operation

and performance of the LM36923H Highly Efficient Triple-String White LED driver. The device offers

configurability via I2C-compatible interface. The EVM contains six dual-LED and a single LED per string

which can be easily configured to support 1, 2 or 3 parallel LED strings with 3, 4, 5, 6, 7, 8, 9, 10, 11, 12

or 13 series LEDs.

Notes:

1) Not all combinations of VIN, LED strings and Number of Series LEDs are supported by the

LM36923H. Refer to the data sheet to ensure the proper configuration.

2) The dual-LED are very bright, they are not diffused and are capable of ~21 lumens per package.

Appropriate LED light diffusion or eye protection must be provided by the user.

The EVM contains one LED Backlight Driver (See Table 1).

Table 1. Device and Package Configurations

LED DRIVER IC PACKAGE

U1 LM36923H 0.4 mm-pitch, 12-Bump DSBGA

Figure 1. LM36923HEVM Photo

USB2ANY

Control ASEL = VIN ASEL = GND

VUSB VIO VL

VUSB

Connection

VUSB VIO VL

Connection

Setup

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LM36923HEVM User's Guide

2 Setup

This section describes the jumpers and connectors on the EVM as well as how to properly connect, set

up, and use the LM36923HEVM.

2.1 Input/Output Connector Description

VL/GND-These are the power input terminals for the driver. The terminal block provides a power (VIN)

and ground (GND) connection to allow the user to attach the EVM to a cable harness.

VUSB VIO VL - This pin provides power for the I2C and HWEN pullup resistors (RSCL, RSDA, RHWEN).

It is recommended that this pin is connected to the VIN pin. If desired, it can be connected to the

USB2ANY 3.3-V line provided by the USB interface connector. When VIO is connected to VIN

communication via the I2C interface may not be possible if the supply voltage to the LED driver is below

approximately 3 V.

Figure 2. VIO Jumper Settings

SDA SCL - These connections allow the user to externally control the I2C lines. For independent control of

the I2C lines, do not connect the VIO jumper to either the 3.3 V or the VIN pin.

HWEN - This is the jumper used to enable the LED driver (HWEN pin). The driver will be enabled when

the HWEN pin is high (VIO) and disabled when it is low (GND).

VL VIN - The user can measure the Backlight Driver Input Current by omitting this jumper and inserting a

current meter between pins 1 (VIN) and 2 (VL).

ASEL - This connector provides a method for controlling the ASEL input to configure the I2C slave

address. A jumper is required to operate the EVM. The LM36923HEVM GUI provides a method for setting

ASEL when a jumper is inserted between pins 2 and 4. When a jumper is inserted between pins 1 and 2

ASEL is connected to VIO through a 4.7-kΩresistor (RA1). When a jumper is inserted between pins 2 and

3 ASEL is connected to GND through a 4.7-kΩresistor (RA0).

Figure 3. ASEL Jumper Settings

PWM - This pin provides a method for connecting either the USB2ANY or an external signal generator to

the PWM input. The PWM pin is connected to ground via a 4.7-kΩresistor (RPWM). The LM36923HEVM

GUI provides a method for generating a PWM signal when a jumper is placed between connector pins 1

and 2. When connecting an external signal generator remove the jumper between pins 1 and 2 and

connect the signal generator to pin 1 and GND.

OUT - This connector provides a way to disconnect the output voltage to each LED string and access to

the regulated output of the driver. The user can measure VOUT with reference to GND while connecting

and disconnecting the LED strings.

12 series LED 2 series LED 4 series LED 6 series LED 8 series LED 10 series LED 12 series LED

OUT

LED String

Disconnected

OUT

LED+ LED+

LED String

Connected

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Setup

SNVU509–January 2016

LM36923HEVM User's Guide

Figure 4. OUT Jumper Settings

HL1, HL2, HL3 - This connector provides a star connection to the LED string allowing the user to

configure the LED string for 1, 2, 3, 4, 5 or 6 series dual-LEDs.

Figure 5. HL1, HL2, HL3 star jumper configuration settings

ODD1, ODD2, ODD3 - These connectors provide a method for inserting a single LED in each string.

When the jumper is removed from ODD1, ODD2 ,ODD3 the single LED D107, D207, D307 is part of the

respective LED string. When a jumper is inserted on ODD1, ODD2, ODD3 the single LED D107, D207,

D307 is bypassed in the respective LED string.

ILED1, ILED2, ILED3 -The LM36923HEVM provides a way to accurately measure the LED current

through each LED string on board. Resistors RL1 , RL2 and RL3 (10 Ω) are placed between the cathode

of last LED in each respective string and the LM36923H Current Sink Output.

2.2 Setup

The input voltage range for the backlight driver is 2.5 volts to 5.5 volts. The on-board LEDs or an LED

module should be connected for proper operation.

2.3 Operation

For proper operation of the LM36923HEVM, the jumpers should be properly configured. The

recommended setting, using shorting blocks is:

ASEL to USB2ANY: install jumper between pins 2 and 4

VIO to VIN: install jumper between pins 2 and 3

VL to VIN: jumper installed

OUT to LED+: install jumper between pins 2 and 3.

PWM from USB2ANY: jumper installed

HL1, HL2, HL3: install jumper in position 3 for each string

ODD1, ODD2, ODD3: jumper installed (odd LED bypassed)

Using these settings the device will be configured for USB2ANY control with 2 dual-led (4 LEDs) per

string.

Board Layout

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LM36923HEVM User's Guide

Figure 6. Jumper Configuration

3 Board Layout

Figure 7,Figure 8,Figure 9 and Figure 10 show the board layout for the LM36923HEVM. The EVM offers

resistors, capacitors, and jumpers to enable the device and to configure it as desired.

The LM36923H will dissipate power, especially during high brightness maintained for a long duration.

Power will also be dissipated on the series LEDs in each LED strings. The EVM layout is designed to

minimize temperature rise during operation, however prolonged usage at high brightness should be

avoided.

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Board Layout

SNVU509–January 2016

LM36923HEVM User's Guide

Figure 7. Top Assembly Layer

Figure 8. Middle Layer 1 Routing

Board Layout

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LM36923HEVM User's Guide

Figure 9. Middle Layer 2 Routing

Figure 10. Bottom Assembly Layer (MIRRORED)

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