ELM311 查看數據表（PDF） - Elm Electronics

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ELM311

Stepper Motor Controller

Elm Electronics 

ELM311

Pin Descriptions

VDD (pin 1)

This pin is the positive supply pin, and should

always be the most positive point in the circuit.

Internal circuitry connected to this pin is used to

provide power on reset of the microprocessor, so

an external reset signal is not required. Refer to

the Electrical Characteristics section for further

information.

A (pin 2)

This is the active high output drive signal for the

(first) phase A winding. Normally, this output

would be the first to be energized when starting a

stepping sequence, and is always the first state

entered into internally on powerup. After powerup,

however, the ELM311 treats this pin specially,

maintaining it at a low level until the first step

command is received. This in effect keeps the

motor off until selected by control circuitry.

Dir (pin 3)

This pin determines the sequence that the outputs

will be energized in. A high input on the Dir pin

while the step input is pulsed will cause a single

clockwise step, while a low level will cause a

counter-clockwise step. (See Figure 1 on page 4)

Dir must be at a stable level prior to the low to

high transition of Step in order to be recognized

(refer to the Tsu specification).

Step (pin 4)

This input is used to control the motion of the

motor. Outputs will change to their next state on

the high to low transition of this input. Step is

normally maintained at a low level, and is only

brought high then low to cause a step to occur.

The Step input is ignored for about 20ms after

power-up to allow sufficient time for external

circuits to stabilize.

D (pin 5)

This is the active high output drive signal for the

(fourth) phase D winding.

C (pin 6)

This is the active high output drive signal for the

(third) phase C winding.

B (pin 7)

This is the active high output drive signal for the

(second) phase B winding.

VSS (pin 8)

Circuit common is connected to this pin. This is

the most negative point in the circuit.

Ordering Information

These integrated circuits are available in either the 300 mil plastic DIP format, or in the 200 mil SOIC surface

mount type of package. To order, add the appropriate suffix to the part number:

300 mil Plastic DIP............................... ELM311P

200 mil SOIC..................................... ELM311SM

All rights reserved. Copyright ©1999 Elm Electronics.

Every effort is made to verify the accuracy of information provided in this document, but no representation or warranty can be

given and no liability assumed by Elm Electronics with respect to the accuracy and/or use of any products or information

described in this document. Elm Electronics will not be responsible for any patent infringements arising from the use of these

products or information, and does not authorize or warrant the use of any Elm Electronics product in life support devices and/or

systems. Elm Electronics reserves the right to make changes to the device(s) described in this document in order to improve

reliability, function, or design.

ELM311DSB

Elm Electronics – Circuits for the Hobbyist

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