Texas Instruments DRV201 Manuale utente

User's Guide

SLVU528–March 2012

DRV201 Evaluation Module

Figure 1. DRV201EVM

The DRV201EVM is an evaluation board to assist in evaluating the DRV201 IC as a voice coil motor

(VCM) driver for camera auto focus.

The device is an advanced voice coil motor driver for camera auto focus. It has an integrated D/A

converter for setting the VCM current. VCM current is controlled with a fixed frequency PWM controller or

a linear mode driver. Current generation can be selected via I2C register. Device has integrated sense

resistor for current regulation and the current can be controlled through I2C.

When changing the current in the VCM the lens ringing is compensated with an advanced ringing

compensation function. Ringing compensation reduces the needed time for auto focus significantly. The

device has also VCM short and open protection functions.

The following related documents are available for download through the Texas Instruments web site at

http://www.ti.com.

1. DRV201 Voice Coil Motor Driver for Camera Auto Focus (SLVSB25)

2. USB Interface Adapter Evaluation Module (SLLU093)

SLVU528–March 2012 DRV201 Evaluation Module

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Contents

1 Introduction .................................................................................................................. 3

1.1 Description .......................................................................................................... 3

1.2 Applications ......................................................................................................... 3

1.3 Features ............................................................................................................. 3

2 System Overview ........................................................................................................... 4

3 Hardware Overview ......................................................................................................... 5

3.1 Connectors .......................................................................................................... 6

3.2 Jumpers ............................................................................................................. 6

3.3 Test Points .......................................................................................................... 6

3.4 EVM Operation ..................................................................................................... 6

4 Software ...................................................................................................................... 7

4.1 Software Installation Instructions ................................................................................. 7

5 EVM Schematic ............................................................................................................. 9

6 PCB layout ................................................................................................................. 10

7 Bill of Materials ............................................................................................................. 12

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Introduction

1 Introduction

1.1 Description

The DRV201EVM is an evaluation board to assist in evaluating the DRV201 IC as a voice coil motor

(VCM) driver for camera autofocus.

The device is an advanced voice coil motor driver for camera Auto focus. It has integrated D/A converter

for setting the VCM current. VCM current is controlled with a fixed frequency PWM controller or a linear

mode driver. Current generation can be selected via I2C register. Device has integrated sense resistor for

current regulation and the current can be controlled through I2C.

When changing the current in the VCM the lens ringing is compensated with an advanced ringing

compensation function. Ringing compensation reduces the needed time for auto focus significantly. The

device has also VCM short and open protection functions.

1.2 Applications

• Camera auto focus

• Camera Iris control

1.3 Features

• Configurable for linear or PWM mode VCM current generation

• High efficiency PWM current control for VCM

• Advanced ringing compensation

• Integrated 10-bit D/A converter for VCM current control

• Protection

– Open and short-circuit detection on VCM pins

– Undervoltage lockout (UVLO)

– Thermal shutdown

– Open and short circuit protection on VCM output

– Internal current limit for VCM driver

• I2C interface

• Operating temperature range: -40ºC to 85ºC

• 6-ball WCSP package with 0.4-mm pitch

• Max die size: 0.8 mm x 1.48 mm

• Package height: 0.15 mm

SLVU528–March 2012 DRV201 Evaluation Module

Host(PC)

USB-to-I2C

Adapter

DRV201

EVM

System Overview

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2 System Overview

Figure 2. System Block Diagram

The system consists of these components:

•Host (PC): a Windows™ personal computer (PC) – used to configure and monitor the DRV201EVM.

The GUI operates on the host. For the GUI to execute properly, the host needs to have the correct

LabView™ RunTime version. If the host doesn’t have the correct RunTime version it will be prompted

during GUI installation. More information in GUI installation section.

•USB-to-I2C adapter: DRV201EVM uses the I2C interface for communication with the host. The TI-

supplied USB-to-I2C adapter shown in Figure 3. USB-to-GPIO adapter does the appropriate conversion

so the host can use the USB interface for communication. USB-to-I2C adapter has a 3.3-V supply rail

which is used to supply the EVM so no external power supply is needed.

•DRV201EVM: EVM board that houses the DRV201 and peripheral components.

Figure 3. USB-to-GPIO Adapter

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Hardware Overview

3 Hardware Overview

The DRV201EVM allows evaluation of the DRV201 IC as a voice coil motor (VCM) driver for camera

autofocus. DRV201EVM has separate connections for Isource and Isink pins that can be used to connect

to any VCM actuator or VCM in a camera module. If VCM actuator is not available there are on board

mounted inductor and resistor available to model VCM.

The DRV201EVM can be configured and monitored through a Windows GUI application running on a PC.

The GUI communicates with the DRV201EVM through the USB Interface Adapter (included with EVM kit),

which acts as an I2C master for the board.

The DRV201EVM provides the following functionality:

• Programming of the DRV201 device.

• R_VCM and L_VCM are meant as a model of a typical VCM actuator electrical parameters.

• Driving either external VCM connected to ISOURCE and ISINK headers or using on board inductor and

resistor (see jumper setting).

• Standard 400-kHz I2C communication via I2C connector to USB adapter for connection to a PC.

• Board can be supplied through the 3.3 V from the USB adapter or from an external power source (see

jumper setting).

Figure 4. Connecting the ribbon cable to DRV201EVM pin one is marked on the EVM and with the red

stripe in the ribbon cable.

SLVU528–March 2012 DRV201 Evaluation Module

Hardware Overview

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3.1 Connectors

The DRV201EVM has connectors for power and I2C communications. J1 provides a possibility to power

EVM from an external power supply (between 2.5 V and 4.8 V). USB adapter interface adapter has a 3.3-

V power output that can be used to power the board so there is no need for external power source.

P1 header provides the I2C communication interface to the DRV201EVM. The USB Interface Adapter

includes a ribbon cable that can be connected to P1. The adapter is connected to a Windows-based PC.

WARNING

When using external power DRV201EVM, it should be noted that

the recommended supply range for DRV201 is from 2.5 V to 4.8 V.

3.2 Jumpers

The DRV201EVM operation can be configured using jumpers:

• Board power from external supply or USB interface adapter

• Driving on board inductor and resistor or external VCM actuator

See Table 1 for descriptions and default settings for the jumpers on the DRV201EVM.

Table 1. DRV201EVM Jumpers

NUMBER FUNCTION DEFAULT SETTING

Board power supply selection. Connect to pins 1-2 when using Pins 1-2 (power from USB

P2 3.3 V from the USB interface adapter and pins 2-3 if external interface adapter)

power supply is used.

R_VCM and L_VCM are connected between DRV201 pins JP1 and JP2 jumpers

JP1 andJP2 ISOURCE and ISINK. If jumpers are not connected, VCM actuator connected

can be connected between ISOURCE and ISINK.

3.3 Test Points

The DRV201EVM provides test points that can be used for evaluation. Important voltages can be

monitored with a meter through the use of the test points.

3.4 EVM Operation

The DRV201EVM operates from either a USB interface adapter (through P1) or an external power supply

(through J1). Jumper P2 can be used to select the power source as described in Section 3.2. Use the

following steps to set up the DRV201EVM.

1. Connect the USB interface adapter to the DRV201EVM P1 connector using the ribbon cable provided.

2. Plug the appropriate end of the USB cable into the adapter and the other end into your PC.

NOTE: If using an external power supply, connect jumper’s pins 2-3 and use J1 to connect the

power supply.

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Software

4 Software

The DRV201EVM comes with a Windows application that can be used to configure and monitor the EVM.

The GUI can be used to configure all available options of the EVM such as programming, current settings,

ringing compensation, VCM resonance frequency, open VCM, and short VCM.

The following section explains the procedure for installing the graphical user interface (GUI) onto a

Windows based PC. A USB interface adapter is required to connect the EVM to a PC and should have

been provided with the EVM.

Additional interfaces can be ordered through http://focus.ti.com/docs/toolsw/folders/print/usb-to-gpio.html.

4.1 Software Installation Instructions

To install the EVM software follow the steps outlined:

• Copy the DRV201EVM.zip to your computer and extract all files.

• Double-click on the setup.exe file in the \Installer\Volume\ directory.

• Follow the prompts to finish the installation.

• At the end of the installation, a reboot of your computer may be required.

Figure 5. setup.exe File Located in the Volume Directory

I2C read/write commands may be made using the provided software. A dark grey block means the bit is

‘high’. A white block means the bit is ‘low’. A write may be performed simply by clicking on an individual bit

or an entire register may be written by using the write command on the left side of the GUI.

SLVU528–March 2012 DRV201 Evaluation Module

Software

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Figure 6. DRV201EVM GUI Main

Figure 7. DRV201EVM GUI Basic

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EVM Schematic

5 EVM Schematic

SLVU528–March 2012 DRV201 Evaluation Module

PCB layout

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6 PCB layout

Figure 8. DRV201EVM Board Layer 1. (TOP)

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