Texas Instruments LM3643EVM User manual

Using the LM3643EVM Evaluation Module

User's Guide

Literature Number: SNVU399

August 2014

Contents

1 Introduction......................................................................................................................... 4

2 Setup.................................................................................................................................. 4

2.1 Input/Output Connector Description ................................................................................... 4

2.2 Setup....................................................................................................................... 6

2.3 Operation.................................................................................................................. 6

3 Board Layout....................................................................................................................... 7

4 Schematic ......................................................................................................................... 10

5 USB Interface Board and I2C-Compatible Interface Program.................................................... 12

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

5.2 Flags...................................................................................................................... 14

5.3 I/O Pin Controls......................................................................................................... 14

2Table of Contents SNVU399–August 2014

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List of Figures

1 Enable Jumper Settings..................................................................................................... 4

2 VIO Jumper Settings ........................................................................................................ 4

3 STROBE Jumper Settings.................................................................................................. 5

4 TORCH/TEMP Jumper Settings........................................................................................... 5

5 TX Jumper Settings ......................................................................................................... 5

6 Jumper Configuration ....................................................................................................... 7

7 Top Assembly Layer......................................................................................................... 8

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

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

10 Bottom Assembly Layer (UNMIRRORED) ............................................................................... 9

11 LM3643EVM Schematic................................................................................................... 10

12 LM3643 General User Interface.......................................................................................... 12

13 I2C interface Fields......................................................................................................... 13

14 Write Buttons................................................................................................................ 13

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

16 I/O Pin Controls............................................................................................................. 14

List of Tables

1 Device and Package Configurations ...................................................................................... 4

2 Bill of Materials ............................................................................................................. 11

SNVU399–August 2014 List of Figures

User's Guide

SNVU399–August 2014

LM3643EVM User's Guide

1 Introduction

The Texas Instruments LM3643EVM evaluation module (EVM) helps designers evaluate the operation

and performance of the LM3643 High-Current LED driver. The device offers configurability via I2C-

compatible interface. It can be enabled in Flash or Torch mode via the I2C interface or externally using the

STROBE and TORCH/TEMP pins. The module utilizes two LEDs (D1 & D2) mounted on the EVM.

The EVM contains one Synchronous Boost LED Flash Driver (See Table 1).

Table 1. Device and Package Configurations

FLASH LED DRIVER IC PACKAGE

U1 LM3643 0.4 mm-pitch, 12-Bump DSBGA

2 Setup

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

up, and use the LM3643EVM.

2.1 Input/Output Connector Description

Input / 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.

EN (J12) - 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).

Figure 1. Enable Jumper Settings

VIO (J16) - This pin provides power for the I2C lines (Clock & Data) and for the HWEN pin. It is

recommended that this pin is connected to the VIN pin. If desired, it can be connected to the 3.3V line

provided by the USB interface connector. In this configuration, 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

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TORCH/TEMP

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Setup

D1-CON (J14 pin3 and pin4) and D2-CON (J14 pin1 and pin2) are the jumpers used to connect the on-

board flash LEDs to the LED output of the driver.

STROBE (J9) - This pin provides an external method for initiating a flash event. The STROBE pin is

connected to ground via a 300-kΩresistor internal to the LM3643. To externally drive this pin, either

connect a control signal directly to the STROBE pin of the connector or place a jumper between connector

pins STROBE and PWM0. Pin PWM0 can be configured as a time-adjustable voltage pulse via the

General User Interface (GUI) software provided.

Figure 3. STROBE Jumper Settings

TORCH/TEMP (J21) - This pin provides an external method for initiating a torch event. The

TORCH/TEMP pin is connected to ground via a 300-kΩresistor internal to the LM3643 as well as an

externally connected NTC thermistor. To externally drive this pin, either connect a control signal directly to

the TORCH/TEMP pin of the connector or place a jumper between connector pins TORCH/TEMP and

PWM1. Pin PWM1 can be configured as ON or OFFvia the GUI software provided. Removing the jumper,

and setting the TORCH/TEMP pin to TEMP mode, the TEMP function can be utilized via the externally

connected NTC thermistor.

Figure 4. TORCH/TEMP Jumper Settings

TX (J11) - This pin is used to initiate a TX-interrupt event. The TX pin is connected to ground via a 300-kΩ

resistor internal to the LM3643. To externally drive this pin, either connect a control signal directly to the

TX pin of the connector or place a jumper between connector pins TX and PWM2. Pin PWM2 can be

configured as to provide continuous voltage pulses via the GUI software provided.

Figure 5. TX Jumper Settings

SDA / SCL (J19) - 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.

SNVU399–August 2014 LM3643EVM User's Guide

Setup

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OUT, LED1, LED2, TORCH/TEMP (J13, J10, J22) - These provide access to the regulated output of the

driver, the outputs of the LED current sources, and the TEMP pin. The user can measure VOUT with

reference to GND, VLED with reference to GND, current source headroom directly between VOUT and

VLED, and can monitor or control TORCH/TEMP input.

VINL/VIN (J7) - The user can monitor the Inductor Current and Input Current waveforms by omitting this

jumper and using separate wires from the power supply to the VINL and VIN pins. This will remove the

Input Capacitors from the Inductor and eliminate their filtering effect to the Inductor Current.

J17 and J18: LED Current measurements -The LM3643EVM provides a way to accurately measure the

LED current through both LEDs on board. Resistors R1 & R2 (0.1 Ω) are placed between the cathode of

LED1 & LED2, respectively, and Ground. The user can first measure the resistor values accurately, by

applying a known current through connector DxF and Ground and measuring the voltage between DxS

and GNDS. Then, during normal flash or torch operation, the voltage measured across the resistor divided

by the resistor value will equal the current through the resistor (and the LED).

2.2 Setup

The input voltage range for the flash 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 LM3643EVM, the jumpers should be properly configured. The recommended

setting, using shorting blocks is:

VIO to VIN

EN to VIO

STROBE to PWM0 or external signal

TORCH/TEMP to PWM1 or external signal

TX to PWM2 or external signal

LEDs (J14) shorted

In this configuration, the device will power up when power is applied.

6LM3643EVM User's Guide SNVU399–August 2014

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Board Layout

Figure 6. Jumper Configuration

3 Board Layout

Figure 7,Figure 8,Figure 9 and Figure 10 show the board layout for the LM3643EVM. The EVM offers

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

The LM3643 will dissipate power, especially during high current and long duration flash events. Power will

also be dissipated on the flash LEDs. The EVM layout is designed to minimize temperature rise during

operation. It is recommended that in order to prevent overheating, repeated flash events in very short time

intervals is avoided.

SNVU399–August 2014 LM3643EVM User's Guide

Board Layout

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Figure 7. Top Assembly Layer

Figure 8. Middle Layer 1 Routing

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Board Layout

Figure 9. Middle Layer 2 Routing

Figure 10. Bottom Assembly Layer (UNMIRRORED)

SNVU399–August 2014 LM3643EVM User's Guide

GND

VINL

2J7 0

VIN1

GND

0.1

GND

0.1

t°

100k ohm

TH1

GND

J10

J13

J21

PWM

J11

J19

I2C

GND

STROBE

GND

J16

VIO

3.3V

VIN

J12

GND

STROBE

VIO

OUT

VIN

1.0k

J18

J17

100µF

CBATT

49.9k

3.3V

GND

SH-VIO1

SH-EN1

SH-TX1

SH-STROBE1

SH-TORCH1

SH-D2

SH-D1

J22

1 2

3 4

5 6

7 8

9 10

N2510-6002-RB

J14

DCON

Ultra White

IN A2

GND

VOUT

HWEN C2

LED2

D1 TX D2

LED1

TORCH/TEMP C3

SCL B3

STROBE B2

SDA A3

LM3643YFF

DFE201610P-1R0M

10µF

C1 10µF

LED1

LED2

GND

J3 GND

J4 GND PWM0 PWM1

PWM2

SCL SDA

PWM1

TX PWM2

TORCH/TEMP

SCL

SDA

PWM0

Schematic

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4 Schematic

Figure 11. LM3643EVM Schematic

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