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 I
2
C register. Device has integrated sense resistor for
current regulation and the current can be controlled through I
2
C.
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
•
I
2
C 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
3
SLVU528 – March 2012
DRV201 Evaluation Module
Copyright © 2012, Texas Instruments Incorporated