A3907ECGTR Allegro Microsystems Inc, A3907ECGTR Datasheet

LOW VOLTAGE VOICE COIL MOTOR DRIVER

A3907ECGTR

Manufacturer Part Number
A3907ECGTR
Description
LOW VOLTAGE VOICE COIL MOTOR DRIVER
Manufacturer
Allegro Microsystems Inc
Datasheet

Specifications of A3907ECGTR

Applications
Voice Coil Motor Driver
Number Of Outputs
1
Current - Output
102mA
Voltage - Supply
2.3 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
6-WLCSP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Load
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
620-1318-2
A3907ECGTR
A3907ECGTR-T
Features and Benefits
▪ WLCSP package for minimum footprint
▪ Ramp control circuit
▪ Fixed I
▪ 10-bit D-to-A converter
▪ 100 μA resolution
▪ Low voltage I
▪ Low current draw sleep mode-active low
▪ 2.3 to 5.5 V operation
Applications:
▪ Camera focus motor
Package: 6-Bump Chip Scale Package
(suffix CG)
A3907-DS
1.8 V
2
C logic thresholds
1.8 kΩ
1.8 kΩ
2
C serial interface
SLEEPZ
VDD
SDA
SCL
I2C Serial
Interface
Bandgap
Functional Block Diagram
Ref
Low Voltage Voice Coil Motor Driver
Control
Timer
Logic
10 Bit DAC
Description
Designed for linear control of small form factor voice coil
motors, the A3907 is capable of peak output currents to 102 mA
and operating voltages to 5.5 V.
Internal circuit protection includes thermal shutdown with
hysteresis, flyback clamp diode, and undervoltage monitoring
of V
DD
.
1.2 Ω
IOUT
GND
A3907
2.3 to
5.5V

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A3907ECGTR Summary of contents

Page 1

Features and Benefits ▪ WLCSP package for minimum footprint ▪ Ramp control circuit 2 ▪ Fixed I C logic thresholds ▪ 10-bit D-to-A converter ▪ 100 μA resolution ▪ Low voltage serial interface ▪ Low current draw ...

Page 2

Low Voltage Voice Coil Motor Driver ABSOLUTE MAXIMUM RATINGS Supply Voltage Logic Input Voltage Range Junction Temperature Storage Temperature Range Operating Temperature Range Package Thermal Resistance A3907ECG Pin Name Pin Description IOUT Sink Drive Output SLEEPZ Standby Mode Control GND ...

Page 3

Low Voltage Voice Coil Motor Driver ELECTRICAL CHARACTERISTICS 25°C, VDD = 2.3V to 5.5V Characteristics Sym Supply Current UVLO Enable Threshold UVLOth UVLO Hysteresis UVLOhys Thermal Shutdown Temp. Thermal Shutdown Hysteresis Power Up Delay D/A Resolution ...

Page 4

Low Voltage Voice Coil Motor Driver ELECTRICAL CHARACTERISTICS 25°C, VDD = 2.3V to 5.5 V Characteristics Interface Bus Free Time Between Stop/Start Hold Time Start Condition Setup Time for Repeated Start Condition SCL ...

Page 5

Low Voltage Voice Coil Motor Driver Functional Description The A3907 output current is controlled by programming the DAC value via the I calculated by I_out = DAC * 100uA …..where DAC = 1 to 1023 Code = ...

Page 6

Low Voltage Voice Coil Motor Driver Slew Rate Control. To allow flexibility on the change in current with respect to time 4 serial port bits are utilized to set the timing between the change between the present current level and ...

Page 7

Low Voltage Voice Coil Motor Driver Interface. This is a serial interface that uses two bus lines, SCL and SDA, to access the internal Control registers. Data is exchanged between a microcontroller (master) and the A3907 (slave). ...

Page 8

Low Voltage Voice Coil Motor Driver A3907 Slave Address Device Identifier Control Register MSByte (I C Write register) Bit Name Function 0 D4 DAC 1 D5 DAC 2 D6 DAC 3 D7 DAC 4 ...

Page 9

Low Voltage Voice Coil Motor Driver Applications Headroom. The current may not reach the programmed level if there is not adequate headroom in the output circuit. The IC output voltage must be over 350mV to guarantee normal linear operation. Vdd, ...

Page 10

Low Voltage Voice Coil Motor Driver 102 Straight line between measured Codes 64 and 1023 Relative Accuracy (64-1023), Errors exaggerated for clarity Figure A 102.3 Iout (mA) Ideal DAC Actual DAC (Errors Exaggerated) Calculated Gain Error, Offset ...

Page 11

Low Voltage Voice Coil Motor Driver WLCSP Package - 11 - A3907 ...

Page 12

Low Voltage Voice Coil Motor Driver Pad Location: Pin Name Pin Description VDD Power Supply In GND Ground IOUT Sink Drive Output SCL I2C Clock SDA I2C Data SLEEPZ Standby Mode Control ...

Page 13

A3907 Copyright ©2009, Allegro MicroSystems, Inc. The products described here are manufactured under one or more U.S. patents or U.S. patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the ...

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