LP5523 datasheet(53/61 Pages) TI2

53 / 61 page

30 ms

TRIGGER SIGNAL

FROM TOUCH

SCREEN

CONTROLLER

ROTATION

CCW

ROTATION

VIBRAP

VIBRAN

TRIG

LP5523

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SNVS550E – SEPTEMBER 2009 – REVISED JANUARY 2017

Product Folder Links: LP5523

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A simple waveform for H-driver control is shown in Figure 30. 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 LP5523 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 30. H-Driver Control Waveform

9 Power Supply Recommendations

The device is designed to operate from an input voltage supply range between 2.7 V and 5.5 V. In a typical

application this is from single Li-ion battery cell. This input supply must be well regulated and able to withstand

maximum input current and maintain stable voltage without voltage drop even at load transition condition (start-

up or rapid brightness change). The resistance of the input supply rail must be low enough that the input current

transient does not cause drop below a 2.7-V level in the LP5523 supply voltage.

LP5523 데이터시트(PDF) 53 Page - Texas Instruments