Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- DESCRIPTION
- PINOUT INFORMATION
- ABSOLUTE MAXIMUM RATINGS
- THERMAL INFORMATION
- RECOMMENDED OPERATING CONDITIONS
- ELECTRICAL CHARACTERISTICS
- TIMING REQUIREMENTS
- TYPICAL CHARACTERISTICS
- SYSTEM DIAGRAMS
- APPLICATION INFORMATION
- ECCENTRIC ROTATING MASS MOTORS (ERM)
- LINEAR RESONANCE ACTUATORS (LRA)
- AUTO-RESONANCE ENGINE FOR LRA
- OPEN LOOP OPERATION FOR LRA
- SMART LOOP ARCHITECTURE
- AUTO CALIBRATION
- WAVEFORM LIBRARIES
- WAVEFORM SEQUENCER
- LIBRARY PARAMETERIZATION
- REAL-TIME PLAYBACK (RTP) MODE
- MULTI-MODE INPUT PIN (IN/TRIG)
- DEVICE ENABLE
- CONSTANT VIBRATION STRENGTH
- EDGE RATE CONTROL
- CAPACITOR SELECTION
- MODES OF OPERATION
- BLOCK DIAGRAM
- GENERAL I2C OPERATION
- SINGLE-BYTE AND MULTIPLE-BYTE TRANSFERS
- SINGLE-BYTE WRITE
- MULTIPLE-BYTE WRITE AND INCREMENTAL MULTIPLE-BYTE WRITE
- SINGLE-BYTE READ
- MULTIPLE-BYTE READ
- REGISTER MAP
- DEVICE PROGRAMMING
- WAVEFORM LIBRARY EFFECTS LIST
- PCB LAYOUT RECOMMENDATIONS
- Revision History
( )
AVG _ ABS
LRA
1
RMS
V V
1 - 4SampleTime 300 f
=
+ sm
AVG _ ABS
5.28 V
V Rated Voltage [7 : 0]
255
=
AVG
5.36 V
V Rated Voltage [7 : 0]
255
=
DRV2605
www.ti.com
SLOS825B –DECEMBER 2012–REVISED JANUARY 2014
DEVICE PROGRAMMING
PROGRAMMING THE RATED VOLTAGE
The RatedVoltage[7:0] value (Register 0x16) is used to set the full scale voltage for the closed-loop drive modes.
The auto calibration routine uses this register as an input, so this register must be written with the motor’s rated
voltage value before calibration is performed. This register is ignored for open-loop operation, since the
overdrive voltage sets the reference for that case. Any modification of this register value should be followed by
calibration to set ACalBEMF appropriately. See "Modes Of Operation" for more details on how this value is used.
ERM Mode (Closed Loop)
Equation 1 gives the average steady-state voltage when a full-scale input signal is provided.
(1)
LRA Mode (Closed Loop)
Equation 2 gives the average of the absolute value of the LRA drive voltage when driven to steady state with a
full-scale input signal.
(2)
And Equation 3 converts the average of the absolute value obtained in Equation 2 to the steady-state RMS
voltage.
(3)
Default Values:
SampleTime = 300 µs
f
LRA
= 175 Hz
V
RMS
= 1.16 V
AVG_ABS
(with default values)
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