LP55231 datasheet(49/53 Pages) TI

49 / 53 page

30 ms

TRIGGER SIGNAL

FROM TOUCH

SCREEN

CONTROLLER

ROTATION

CCW

ROTATION

VIBRAP

VIBRAN

TRIG

LP55231

VOUT

COUT

1 PF

0.47 PF

ASEL0

ASEL1

GND

MCU

SCL

SDA

CLK

TRIG

INT

CIN

1 PF

VIN

VDD

0.47 PF

C1+ C1- C2+ C2-

VIBRAP

VIBRA

MOTOR

H-DRIVER

INA

INB

OUTA

OUTB

VDD

VIBRAN

240R/100 MHz

FERRITE

1 nF

TRIG FROM

SCREEN

CONTROLLER

100 k:

APPLICATION

PROCESSOR

CONTROL

(OPTIONAL)

{

LP55231

www.ti.com

SNOSCR5 – MARCH 2013

Figure 29. Haptic Feedback Application

Figure 29 depicts an example schematic for LP55231 driving a vibra motor. A vibra motor can be used for haptic

feedback with touch screens and also for normal vibra operation (call indication etc.). Battery-powered D8 and

D9 outputs are used for controlling the H-Driver (Microchip TC442x-series or equivalent), which drives the vibra

motor. (The remaining outputs D1 to D7 can be used for LED driving, of course.) With H-Driver the rotation

direction of the vibra motor can be changed. For vibra operation user can load several programs to the LP55231

program memory in order to get interesting vibration effects, with changing frequency, “ramps”, etc.

If the application processor has controls for a vibra motor they can be connected to H-Driver INA and INB as

shown in Figure 29. In this case the vibra can be controlled directly with application processor and also with

LP55231. If application processor control is not needed, then the 100 k

Ω resistors should be connected to GND.

Figure 30. Control Waveform

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