1334 Просмотр технического описания (PDF) - STMicroelectronics

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1334

STEPPER MOTOR CONTROLLERS

STMicroelectronics 

PIN FUNCTIONS - L297/L297D

N°

NAME

1

SYNC

2

GND

3

HOME

4

A

5

INH1

6

B

7

C

8

INH2

9

D

10

ENABLE

11

CONTROL

12

Vs

13

SENS2

14

SENS1

15

Vref

16

OSC

17

CW/CCW

18

CLOCK

L297-L297D

FUNCTION

Output of the on-chip chopper oscillator.

The SYNC connections The SYNC connections of all L297s to be

synchronized are connected together and the oscillator

components are omitted on all but one. If an external clock source

is used it is injected at this terminal.

Ground connection.

Open collector output that indicates when the L297 is in its initial

state (ABCD = 0101).

The transistor is open when this signal is active.

Motor phase A drive signal for power stage.

Active low inhibit control for driver stage of A and B phases.

When a bipolar bridge is used this signal can be used to ensure

fast decay of load current when a winding is de-energized. Also

used by chopper to regulate load current if CONTROL input is low.

Motor phase B drive signal for power stage.

Motor phase C drive signal for power stage.

Active low inhibit control for drive stages of C and D phases.

Same functions as INH1.

Motor phase D drive signal for power stage.

Chip enable input. When low (inactive) INH1, INH2, A, B, C and D

are brought low.

Control input that defines action of chopper.

When low chopper acts on INH1 and INH2; when high chopper

acts on phase lines ABCD.

5V supply input.

Input for load current sense voltage from power stages of phases

C and D.

Input for load current sense voltage from power stages of phases

A and B.

Reference voltage for chopper circuit. A voltage applied to this pin

determines the peak load current.

An RC network (R to VCC, C to ground) connected to this terminal

determines the chopper rate. This terminal is connected to ground

on all but one device in synchronized multi - L297 configurations. f

≅ 1/0.69 RC

Clockwise/counterclockwise direction control input.

Physical direction of motor rotation also depends on connection

of windings.

Synchronized internally therefore direction can be changed at any

time.

Step clock. An active low pulse on this input advances the motor

one increment. The step occurs on the rising edge of this signal.

3/11

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