L6285 datasheet(6/16 Pages) STMICROELECTRONICS

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BLOCK DIAGRAM DESCRIPTION

(see Block Diagram)

Inside the I.C. there are two unipolar stepper mo-

tor drivers, one bridge driver for DC motor, 4x4 bit

latch registers, one shift register. the input logic,

the charge pump, and the thermal protection.

The following conditions are valid for all the 3

driver sections:

1)When the osc/res pin is tied to GND, an inter-

nal reset signal is generated which switches

off all the outputs and resets the internal reg-

isters.

2)The conditions 1 is valid also during power on

and power off transitions.

3)During power on and power off, the I.C. is

safe for any conditions of VS and Vp

3)If Vp is present and VS desappears, the out-

puts are switched off.

Input Logic

The input CMOS logic interfaces the microproces-

sor logic to the 4 registers. An integrated Schmitt-

trigger circuit is used to improve noise immunity

at each logic input.

The data is introduced in the 16bit shift register by

the SID pin. The first bit b 15 after 16 clock ap-

plied to SCK pin will be the D15 of the shift regis-

ter.

On the falling edge of STB the 16 bits of the shift

latch registers. Fig 2 shows the timing.

CHA and CHB Stepper Motor Drivers

PHASE 1A

NPHASE 2A

PHASE 3A

NPHASE 4A

CHANNEL A

PHASE 1B

NPHASE2B

PHASE 3B

NPHASE4B

CHANNEL B

D/A CHANNEL A

D/A CHANNEL B

LEAST

MOST

LEAST

MOST

INPUT 1

INPUT 2

V2 VOLTAGE

CHANNEL C

Registers

The Combo Motor Driver controls the 3 channels using 4 latch registers of 4 bit each:

OUT1 A/B

OUT2 A/B

OUT3 A/B

OUT4 A/B

OFF

ALL THE OTHERS

OFF

REFER. VOLT AGE CHANNEL A

0.125 V

0.250 V

0.375 V

0.500 V

REFER. VOLTAGE CHANNEL B

0.125 V

0.250 V

0.375 V

0.500 V

L6285

6/16

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