LP55231 datasheet(49/59 Pages) TI2

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30 ms

TRIGGER SIGNAL

FROM TOUCH

SCREEN

CONTROLLER

ROTATION

CCW

ROTATION

VIBRAP

VIBRAN

TRIG

LP55231

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SNOSCR5D – MARCH 2013 – REVISED DECEMBER 2016

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

shown in Figure 30. In this case the vibra can be controlled directly with application processor and also with

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

Ω resistors to GND.

A simple waveform for H-driver control is shown in Figure 31. At first the motor rotates in CW direction for 30 ms,

following a rotation of 30 ms in CCW direction. The sequence is started when the TRIG signal is pulled down

(active low signal). the TRIG signal is received from the touch screen controller. After the sequence is executed,

the LP55231 waits for another TRIG signal to start the sequence again. TRIG signal timing is not critical; it does

not have to be pulled down for the whole sequence duration like in the example. For call indication, etc. purposes

the program can be changed; for example, rotation times can be adjusted to get desired haptic reaction. Direct

control of D8 and D9 output is also possible through the control registers, if programming is not desired.

Figure 31. Control Waveform

8.2.2.1 Design Requirements

DESIGN PARAMETER

EXAMPLE VALUE

Input voltage range

2.7 V to 5.5 V

LED VF (maximum)

3.6 V

LED current

25.5 mA maximum

Input capacitor

CIN1 = 1 μF

Output capacitor

COUT = 1 μF

Charge pump fly capacitors

C1 = C2 = 0.47 μF

Charge pump mode

1.5× or Automatic

8.2.2.2 Detailed Design Procedure

External component selection follows the earlier example (see Detailed Design Procedure above). H-Bridge must

be selected to have high enough current capability for the vibra motor and control interface suitable for LP55231

LED outputs.

8.2.2.3 Application Curves

See Application Curves above.

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