UMD9115

Preliminary

CMOS IC

UNISONIC TECHNOLOGIES CO., LTD

6 of 7

www.unisonic.com.tw

 APPLI CAT ION I NFORM AT I ON

1. Baseline Mode

(a) Standby mode

In standby mode, INA=INB=L. All internal circuits, including the drive power tube, are off state. Circuit

consumption is extremely low. In this mode, OUTA and OUTB both are in high-impedance state.

(b) Forward mode

The forward mode is defined as: INA=H, INB=L, at this point the motor drive end OUTA outputs high level, and

the motor drive end OUTB outputs low level, then the motor drives the current into the motor from the OUTA, and out

from the OUTB to the ground. This motor rotation mode is defined as the forward mode.

(c) Backward mode

The backward mode is defined as: INA=L, INB=H, at this point the motor drive end OUTB outputs high level,

and the motor drive end OUTA outputs low level, then the motor drives the current into the motor from the OUTB,

and out from the OUTA to the ground. This motor rotation mode is defined as the backward mode.

(d) Brake mode

The brake mode is defined as: INA=H, INB=H, at this point motor drive ends OUTA and OUTB both output low

level, and the energy stored in the motor will be quickly released through the OUTA end’s NMOS tube or the OUTB

end’s NMOS tube, so the motor will stop turning in a short time.

Note: in brake mode, circuit will consume static power.

M

OFF

OFF

OFF

OFF

(a) Standby mode

ON

OFF

OFF

ON

M

(b) Forward mode

OFF

ON

ON

OFF

M

(c) Backward mode

OFF

ON

OFF

ON

M

(d) Brake mode