8

µµµµPD16882

Data Sheet S13966EJ1V0DS

7. FUNCTION OPERATION TABLE

(1) ST/SP (start/stop) function

Turning ON/OFF the spindle can be controlled by the ST/SP pin while the oscillator is operating. When the

ST/SP pin is high, the spindle is activated (operating); when it is low, the spindle stops. When the spindle stops,

the MOSFET at the high side is ON and the MOSFET at the low side is OFF, serving as a short brake.

•••• ST/SP = “H”

Input Signal

OUT0

OUT1

OUT2

Low-side PWM

Circuit Operation

Excited Phase

H

H

L

ON

Excited (operates)

H

H

L

OFF

Regeneration (brake)

W

→ V

H

L

L

ON

Excited (operates)

H

L

L

OFF

Regeneration (brake)

W

→ U

H

L

H

ON

Excited (operates)

H

L

H

OFF

Regeneration (brake)

V

→ U

L

L

H

ON

Excited (operates)

L

L

H

OFF

Regeneration (brake)

V

→ W

L

H

H

ON

Excited (operates)

L

H

H

OFF

Regeneration (brake)

U

→ W

L

H

L

ON

Excited (operates)

L

H

L

OFF

Regeneration (brake)

U

→ V

During regeneration (brake), the input signal goes through the channel of the high-side Pch MOSFET.

•••• ST/SP = “L”

Drive Timing (Motor Output Signal)

OUT0

OUT1

OUT2

PWM

Circuit Operation

−−

−−

Short brake

(2) Torque control

The output stage is driven by applying a differential voltage between the control reference voltage (ECR) and

control input voltage (EC) pins (ECR-EC). With this product, the ECR-EC differential voltage and output PWM

duty have a linear relationship. The input deadband is

±50 mV TYP. and the duty of the standard model is 100%

at 0.75 V (excluding the deadband).

The

µPD16882 also has a break selection pin (BRsel). When this pin goes high, ECR is less than EC and the

brake is applied in the reverse direction (refer to the figure and table on the next page).