Description

AN4339

22/27

DocID025039 Rev 1

1.4.5

Typical TACHO waveforms and speed control loop

Figure 13. Typical TACHO waveforms and speed control loop

1.4.6

BRAKE function

Brake input pin. Low logic level switches on all high side Power MOSFETs, implementing

the brake function. If not used, it has to be connected to +5 V.

1.4.7

FWD/REV functions

Input to forward and reverse function for the motor i.e to select the direction of the rotation.

HIGH logic level sets forward operation, whereas LOW logic level sets reverse operation. If

not used, it has to be connected to GND or +5 V.

1.4.8

Enable input (EN)

Chip enable input. LOW logic level switches OFF all Power MOSFETs. If not used, it has to

be connected to +5 V.

1.4.9

RC network pin. A parallel RC network connected between this pin and ground sets the

duration of the monostable pulse used for the frequency-to-voltage converter.

1.4.10

time.