Classic stepper motor driver circuitry
The A4983 stepper motor driver carrier is a breakout board for Allegro’s easy-to-u A4983 microstepping bipolar stepper motor driver. The driver features adjustable current limiting and five different microstep resolutions. It operates from 8 – 35 V and can deliver up to 2 A per coil.
Note: We recommend the newer A4988 stepper motor driver carrier over this A4983 carrier; it is a drop-in replacement for this product with additional integrated protection.
Overview
This product is a carrier board or breakout board for Allegro’s A4983 DMOS Microstepping Driver with Translator; we therefore recommend careful reading of the A4983 datasheet (368k pdf) before using thi
s product. This stepper motor driver lets you control one bipolar stepper motor at up to 2 A output current per coil (e the Power Dissipation Considerations ction below for more information). Here are some of the driver’s key features:
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•Simple step and direction control interface
•Five different step resolutions: full-step, half-step, quarter-step, eighth-step, and sixteenth-step
•Adjustable current control lets you t the maximum current output with
a potentiometer, which lets you u voltages above your stepper
motor’s rated voltage to achieve higher step rates高管英文
•Intelligent chopping control that automatically lects the correct current decay mode (fast decay or slow decay)
yell的意思•Over-temperature thermal shutdown, under-voltage lockout, and crossover-current protection
Like nearly all our other carrier boards, this product ships with all
surface-mount components—including the A4983 driver IC—installed as shown in the product picture.
We also ll a larger version of the A4983 carrier that has rever power protection on the main power input and built-in 5 V and 3.3 V voltage regulators that eliminate the need for parate logic and motor supplies.
Included hardware
puppy love什么意思The A4983 stepper motor driver carrier comes with one 1×16-pin breakaway 0.1" male header. The headers can be soldered in for u with solderless breadboards or 0.1" female connectors. You can also solder your motor leads and other connections directly to the board.
Using the driver
学习英语口语的网站Minimal wiring diagram for connecting a microcontroller to an A4983 stepper
motor driver carrier (full-step mode).
nomenclaturePower connections
The driver requires a logic supply voltage (3 – 5.5 V) to be connected across the VDD and GND pins and a motor supply voltage of (8 – 35 V) to be connected across VMOT and GND. The supplies s
hould have appropriate decoupling capacitors clo to the board, and they should be capable of delivering the expected currents (peaks up to 4 A for the motor supply). We also ll a version of the A4983 carrier with 5 V or 3.3 V voltage regulators eliminating the need for parate logic and motor supplies.
Motor connections
Four, six, and eight-wire stepper motors can be driven by the A4983 if they are properly connected; a FAQ answer explains the proper wirings in detail. Warning: Connecting or disconnecting a stepper motor while the driver is powered can destroy the driver. (More generally, rewiring anything while it is powered is asking for trouble.)
Step (and microstep) sizewaterman
Stepper motors typically have a step size specification (e.g. 1.8° or 200 steps per revolution), which applies to full steps. A microstepping driver such as the A4983 allows higher resolutions by allowing intermediate step locations, which are achieved by energizing the coils with intermediate current levels. For
instance, driving a motor in quarter-step mode will give theteenage
掉头发吃什么好200-step-per-revolution motor 800 microsteps per revolution by using four different current levels.
The resolution (step size) lector inputs (MS1, MS2, MS3) enable lection from the five step resolutions according to the table below. MS2 and MS3 have internal 100kΩ pull-down resistors, but MS1 does not, so it must be connected externally. For the microstep modes to function correctly, the current limit must be t low enough (e below) so that current limiting gets engaged. Otherwi, the intermediate current levels will not be correctly maintained, and the motor will effectively operate in a full-step mode.
MS1 MS2 MS3 Microstep Resolution
Low Low Low Full step
High Low Low Half step
Low High Low Quarter step
High High Low Eighth step
High High High Sixteenth step
Control inputs
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Each pul to the STEP input corresponds to one microstep of the stepper motor in the direction lected by the DIR pin. Note that the STEP and DIR pins are not pulled to any particular voltage internally, so you should not leave