L6287 datasheet(4/9 Pages) STMICROELECTRONICS

4 / 9 page

PIN DESCRIPTION

VOLTAGE SUPPLIES (The power supply voltage VDD,VDC,VDL must be connected toghether externally)

VDD

Power supply voltage for drump motor

VDC

Power supply voltage for capstan motor

VDL

Power supply voltage for loading motor and charge pump

VCC

Logic voltage supply

LGND

Logic Ground

GND R

Capstan + drum power ground

GND L

Loading + Charge pump Power ground

Analog voltage supply

SGND

Analog ground

Note: The VCC and VS Power Supply must be together either at maximum or minimum value.

DRUM MOTOR

DOUT U

Winding Output U

DOUT V

Winding Output V

DOUT W

Winding Output W

DPWM

PWM logic pulse input. Control signal generated by

µP for dump motor current regulation.

PUD

Logic output position feedback generated by the translator logic

Optocoupler diode output

External capacitor for tacho-converter integrator

Input for optocoupler transistor

Tacho-converter external resistor. This resistor defines the full-light current level of the tacho.

CAPSTAN MOTOR

COUT U

Winding Output U

COUT V

Winding Output V

COUT W

Winding Output W

CPWM

PWM logic pulse input. Control signal generated by

µP for current regulation.

CDIR

Motor Direction Logic Input Signal

H1+

Hall sensor differential input

H1-

H2+

Hall sensor differential input

H2-

H3+

Hall sensor differential input

H3-

LOADING MOTOR

LOUT A

Winding Output A

LOUT B

Winding Output B

LPWM

PWM logic input.

LDIR

Direction logic input

SERVICES

HEATER

Open drain output for heater resistor

VCP

Charge pump storage capacitor pin

CP1

Bootstrap Capacitor pin

CP2

Bootstrap Capacitor pin

THERM

Open drain thermal alarm output

FSTART

Start-up logic signal for drum motor

CTO

Time out capacitor output

L6287

4/9

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