Datasheet
TPS73633
GND
IN
EN
OUT
NR/FB
SCL
SDA
EN
IN/TRIG
REG
OUT±
V
DD
GND
OUT+
DRV2605
MSP430G2553
P1.6/SCL
P1.7/SDA
P3.1
DVSSAVSS
AVCC
DVCC
P2.0
P2.1
SBWTDIO
SBWTCK
C
(LDO)
1 µF
R
(PU)
2.2 k
R
(PU)
2.2 k
C
(REG)
1 µF
M
LRA or
ERM
C
(VDD)
0.1 µF
R
(SBW)
9.76 k
C
(VCC)
0.1 µF
Captouch
Buttons
Programming
Li-ion
DRV2605
SLOS825C –DECEMBER 2012 –REVISED SEPTEMBER 2014
www.ti.com
8.2 Typical Application
A typical application of the DRV2605 device is in a system that has external buttons which fire different haptic
effects when pressed. Figure 56 shows a typical schematic of such a system. The buttons can be physical
buttons, capacitive-touch buttons, or GPIO signals coming from the touch-screen system.
Effects in this type of system are programmable.
Figure 56. Typical Application Schematic
8.2.1 Design Requirements
For this design example, use the values listed in Table 31 as the input parameters.
Table 31. Design Parameters
DESIGN PARAMETER EXAMPLE VALUE
Interface I
2
C, external trigger
Actuator type LRA, ERM
Input power source Li-ion/Li-polymer, 5-V boost
8.2.2 Detailed Design Procedure
8.2.2.1 Actuator Selection
The actuator decision is based on many factors including cost, form factor, vibration strength, power-
consumption requirements, haptic sharpness requirements, reliability, and audible noise performance. The
actuator selection is one of the most important design considerations of a haptic system and therefore the
actuator should be the first component to consider when designing the system. The following sections list the
basics of ERM and LRA actuators.
8.2.2.1.1 Eccentric Rotating-Mass Motors (ERM)
Eccentric rotating-mass motors (ERMs) are typically DC-controlled motors of the bar or coin type. ERMs can be
driven in the clockwise direction or counter-clockwise direction depending on the polarity of voltage across the
two pins. Bidirectional drive is made possible in a single-supply system by differential outputs that are capable of
sourcing and sinking current. This feature helps eliminate long vibration tails which are undesirable in haptic
feedback systems.
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