DRV2624 Datasheet, PDF (64/79 Pages) Texas Instruments – DRV2624 Ultra Low Power Closed-Loop LRA/ERM Haptic Driver with Internal Memory

DRV2624
SLOS893A – DECEMBER 2015 – REVISED DECEMBER 2015
Typical Application (continued)
MSP430G2553
C_(REG)
0.1 µF
Programming
R_(SBW)
9.76 k
Captouch
Buttons
AVCC
DVCC
SBWTDIO
SBWTCK
P1.6/SCL
P1.7/SDA
P3.1
P2.0
P2.1
AVSS
P1.1
DVSS
www.ti.com
TPS73633
OUT
IN
NR/FB EN
C_(LDO)
1 µF
GND
R_(PU)
2.2 k
R_(PU) R_(PU)
2.2 k 2.2 k
DRV2624
OUT+
SCL
REG
SDA
OUT±
NRST
TRIG/INTZ
V_DD
GND
C_(REG)
0.1 µF
M
LRA or
ERM
C_(VDD)
0.1 µF
Li-ion
Figure 99. Typical Application Schematic With Interrupt Pin
9.2.1 Design Requirements
For this design example, use the values listed in Table 53 as the input parameters.
DESIGN PARAMETER
Interface
Actuator type
Input power source
Table 53. 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.
64
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