AM7232

Motor Driver ICs

http://www.amtek-semi.com

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Specifications subject to change without notice

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This IC detect the rotation of the motor by hall signal, and adjust lock detection ON time (Ton) and

lock detection OFF time (Toff) by the internal counter. These time (Ton, Toff) are showed below.

Fig.6 Lock detect and auto restart motion

Only in Lock detection ON Time (Ton), motor will be rest ordinary motion by switching over of hall

signal. There is lock soft start function, When IC in reset ordinary motion, Output will shaping by

50% duty to start-up the motor, that will reduce lock start current and acoustic noise.

When RMI connect to Vref, this IC make the lock protection function off, when the PWM input keeps

low level for more than 70ms (typ.)

Fig.7 PWM input signal and lock protect function

Lock protect function does not work if PWM input frequency is slower than 15Hz (typ.)

So, please input faster frequency more than 20Hz

70ms(typ)

PWM

Lock protect

enable (internal)

enable

disable

enable