LP5523 datasheet(48/56 Pages) TI1

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30 ms

TRIGGER SIGNAL

FROM TOUCH

SCREEN

CONTROLLER

ROTATION

CCW

ROTATION

VIBRAP

VIBRAN

TRIG

LP5523

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-

GPO

VIBRAP

H-DRIVER

INA

INB

OUTA

OUTB

VDD

VIBRAN

240R/100 MHz

FERRITE

1 nF

TRIG FROM

SCREEN

CONTROLLER

100 k:

APPLICATION

PROCESSOR

CONTROL

(OPTIONAL)

{

LP5523

SNVS550D – SEPTEMBER 2009 – REVISED MAY 2013

www.ti.com

Figure 29. Example Schematic – Vibra Motor

Figure 29 depicts an example schematic for LP5523 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 LP5523

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

LP5523. If application processor control is not needed, then the 100 k

Ω resistors should be connected to GND.

Figure 30. H-Driver Control Waveform

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