stepper_TMC2208.md

Stepper Motor Driver TMC2208

Digikey

About

Datasheet
Ref. youtube

Mode

• Mode 1: Standalone STEP/DIR Driver (Legacy Mode)

  • Replacement for A4988
  • Manual Vref/Stepper Current

• Mode 2: Standalone STEP/DIR Driver with OTP pre-configuration

  • OTP (One Time Programming)

• Mode 3: STEP/DIR Driver with Full Diagnostics and Control

  • pin PDN_UART is connected to the CPU UART interface

Set up as Mode 1

Mode select

• Mode 1: no jumber (default)

Stepper Motor

42SHD4002-24B|datasheet

• Rated voltage: 12V
• Rated current: 0.55A

Vref formula

RMS Current

• Root Mean Square (二乗平均平方根)

RMS Current = MAX CURRENT / 1.41
VREF = (RMS Current x 2.5)/1.77)

value	formula	42SHD4002-24B	Safer use 90% of VREF
RMS Current	MAX Current / 1.41	0.55[A] / 1.41 = 0.39	-
VREF	(RMS Current x 2.5)/1.77	(0.39 x 2.5)/1.77 = 0.55	0.55 x 0.9 = 0.495[V]

Arduino

Library

New: TMCStepper
Old: TMC2208Stepper

Sketch -> Include Library -> Library Manager -> Search "tmc" -> install both libraries

sample Sketch

File -> Examples -> TMC2208Stepper -> TMC2208_Simple

// Author Teemu Mäntykallio, 2017-04-07

// Define pins
#define EN_PIN    38  // LOW: Driver enabled. HIGH: Driver disabled
#define STEP_PIN  54  // Step on rising edge

#include <TMC2208Stepper.h>                       // Include library
TMC2208Stepper driver = TMC2208Stepper(&Serial1);  // Create driver and use
                                                  // HardwareSerial0 for communication

void setup() {
  Serial.begin(9600);
  Serial.println("Start...");
  Serial1.begin(115200);        // Start hardware serial 1
  driver.push();                // Reset registers

  // Prepare pins
  pinMode(EN_PIN, OUTPUT);
  pinMode(STEP_PIN, OUTPUT);
  digitalWrite(EN_PIN, HIGH);   // Disable driver in hardware

  driver.pdn_disable(true);     // Use PDN/UART pin for communication
  driver.I_scale_analog(false); // Use internal voltage reference
  driver.rms_current(500);      // Set driver current 500mA
  driver.toff(2);               // Enable driver in software

  digitalWrite(EN_PIN, LOW);    // Enable driver in hardware

  uint32_t data = 0;
  Serial.print("DRV_STATUS = 0x");
  driver.DRV_STATUS(&data);
  Serial.println(data, HEX);
}

void loop() {
  digitalWrite(STEP_PIN, !digitalRead(STEP_PIN));
  delayMicroseconds(100);
}