DRV201 Datasheet, PDF (4/17 Pages) Texas Instruments – VOICE COIL MOTOR DRIVER FOR CAMERA AUTO FOCUS

DRV201
SLVSB25 – AUGUST 2011
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Over recommended free-air temperature range and over recommended input voltage range (typical at an ambient
temperature range of 25°C) (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
I_DETCODE
Minimum VCM code for OPEN and
SHORT detection
See ⁽²⁾
256
mA
f_SW
Switching frequency
V_DRP
Internal dropout
L_VCM
VCM inductance
R_VCM
VCM resistance
LENS MOVEMENT CONTROL
Selectable through CONTROL register
0.5
See ⁽³⁾
30
11
4 MHz
0.4 V
150 µH
22 Ω
t_set1
t_set2
f_VCM
Lens settling time
Lens settling time
VCM resonance frequency
VCM resonance frequency tolerance
±10% error band
±10% error band
2/f_VCM
ms
1/f_VCM
ms
50
150 Hz
-20
20 %
LOGIC I/Os (SDA AND SCL)
I_IN
Input leakage current
R_PullUp
I²C pull-up resistors
V_IH
Input high level
V_IL
Input low level
t_TIMEOUT SCL timeout for shutdown detection
R_PD
Pull down resistor at SCL line
f_SCL
I²C clock frequency
INTERNAL OSCILLATOR
V = 3.6 V, SCL
V = 3.6 V, SDA
SDA and SCL pins
See ⁽⁴⁾
See ⁽⁵⁾
-20
-1
1.17
0
0.5
20
µA
1
4.7
kΩ
3.6 V
0.63 V
1 ms
500
kΩ
400 kHz
f_OSC
Internal oscillator
Frequency accuracy
THERMAL SHUTDOWN
20°C ≤ T_A ≤ 70°C
-3
-40°C ≤ T_A ≤ 85°C
-5
3%
5%
T_TRIP
Thermal shutdown trip point
140
°C
(2) When testing VCM open or short this is the recommended minimum VCM code (in dec) to be used.
(3) This is the voltage that is needed for the feedback resistor and high side driver. It should be noted that the maximum VCM resistance is
limited by this voltage and supply voltage. E.g. 3-V supply maximum VCM resistance is: R_VCM = (V_BAT – V_DRP)/I_VCM = (3 V - 0.4
V)/102.3 mA = 25.4 Ω.
(4) During shutdown to standby transition V_IH low limit is 1.28 V.
(5) During shutdown to standby transition V_IL low limit is 0.51 V.
4
Copyright © 2011, Texas Instruments Incorporated