upd16882 Renesas Electronics Corporation., upd16882 Datasheet - Page 9

• Manufacturer Part Number: upd16882
• Description: Monolithic Cd-rom/dvd-rom 3-phase Spindle Motor Driver
• Manufacturer: Renesas Electronics Corporation.

(3) FG pulse selection function
If the BRsel pin goes low, a short brake is applied and only the high side is ON if ECR is equal to or less than
EC. When the brake is applied in the reverse direction, the µ PD16882 detects the reverse revolution of the
motor and then stops. For ECR-ER and the logic of the BRsel pin, refer to the table below.
Note The µ PD16882 stops after it has detected the reverse revolution of the motor. When the motor revolves
This product can vary index signal (FG) output in proportion to the number of revolutions.
Depending on the setting of the FGsel pin, either single-phase output or three-phase synthesized output can be
selected.
For the logic, refer to the table below.
in the reverse direction, the counter electromotive force flows into the VM pin via the channel of the high-
side Pch MOSFET.
ECR > EC
ECR < EC
FG pulse output
(−)
Input
deadband
±100 mV
−0.75 V
TYP.
Single-phase output
Short brake
Data Sheet S13966EJ1V0DS
Forward
Forword torque
100%
MAX.
Reverse torque
L
L
Output duty
100%
BRsel Pin Logic
FGsel Pin Logic
+0.75 V
TYP.
3-phase synthesized output
Reverse brake
Forward
H
H
(+) ECR-EC
Note
µ µ µ µ PD16882
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