DRV2605L Datasheet, PDF (53/69 Pages) Texas Instruments – DRV2605L 2 to 5.2 V Haptic Driver for LRA and ERM With Effect Library and Smart-Loop Architecture

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DRV2605L
SLOS854C – MAY 2014 – REVISED SEPTEMBER 2014
9.2 Typical Application
A typical application of the DRV2605L device is in a system that has external buttons which fire different haptic
effects when pressed. Figure 60 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.
TPS73633
OUT
IN
NR/FB EN
C(LDO)
1 µF
GND
MSP430 G2553
C(VCC)
0.1 µF
Programming
R(SBW)
9 .76 kΩ
Captouch
Buttons
AVCC
DVCC
SBWTDIO
SBWTCK
P 2.0
P 2.1
P1.6/SCL
P1.7/SDA
P3.1
AVSS
DVSS
R(PU) R(PU)
2.2 kΩ 2.2 kΩ
DRV 2605 L
OUT+
SCL
REG
SDA
OUT –
EN
IN /TRIG
VDD
GND
C(REG)
1 µF
M ^{LRA or}
ERM
C(VDD)
1 µF
Li-ion
Figure 60. Typical Application Schematic
9.2.1 Design Requirements
For this design example, use the values listed in Table 33 as the input parameters.
DESIGN PARAMETER
Interface
Actuator type
Input power source
Table 33. Design Parameters
EXAMPLE VALUE
I²C, external trigger
LRA, ERM
Li-ion/Li-polymer, 5-V boost
9.2.2 Detailed Design Procedure
9.2.2.1 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.
9.2.2.1.1 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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