TMC2208 datasheet(4/81 Pages) TRINAMIC

4 / 81 page

TMC220X, TMC222X DATASHEET (Rev. 1.02 / 2017-MAY-16)

www.trinamic.com

1 Principles of Operation

The TMC22xx family of stepper drivers is intended as a drop-in upgrade for existing low cost stepper

driver applications. Its silent drive technology stealthChop enables non-bugging motion control for

home and office applications. A highly efficient power stage enables high current from a tiny package.

The TMC22xx requires just a few control pins on its tiny package. They allow selection of the most

important setting: the desired microstep resolution. A choice of 2, 4, 8, 16 or 32 microsteps adapts the

driver to the capabilities of the motion controller. Some package options also allow chopper mode

selection by pin.

Even at low microstepping rate, the TMC22xx offers a number of unique enhancements over

comparable products: TRINAMICs sophisticated stealthChop2 chopper plus the microstep enhancement

microPlyer ensure noiseless operation, maximum efficiency and best motor torque. Its fast current

regulation and optional combination with spreadCycle allow for highly dynamic motion. Protection

and diagnostic features support robust and reliable operation. A simple-to-use 8 bit UART interface

opens up more tuning and control options. Application specific tuning can be stored to on-chip OTP

memory. Industries’ most advanced step & direction stepper motor driver family upgrades designs to

noiseless and most precise operation for cost-effective and highly competitive solutions.

22n

50V

100n

16V

Full Bridge A

Full Bridge B

+VM

stepper

motor

OA1

OA2

OB1

OB2

Driver

100n

BRB

100µF

BRA

RSA

Use low inductivity SMD

type, e.g. 1206, 0.5W for

RSA and RSB

RSB

100n

opt. driver enable

stealthChop2

spreadCycle

Integrated

Rsense

IREF

256 Microstep

Sequencer

Stand Still

Current

Reduction

2.2µ

6.3V

Low ESR type

Place near IC with

short path to die pad

Connect directly

to GND plane

Connect directly

to GND plane

VCC_IO

TMC22xx

Step&Dir input

5V Voltage

regulator

charge pump

CLK_IN

opt. ext. clock

10-16MHz

3.3V or 5V

I/O voltage

100n

Analog Scaling

VREF

Programmable

Diagnostic

Outputs

Configuration

Interface

MS1

MS2

SPREAD

INDEX

DIAG

Configuration

(GND or VCC_IO)

Index pulse

Driver error

PDN/UART

B. Dwersteg, ©

TRINAMIC 2016

Trimmed

CLK oscillator/

selector

UART interface

+ Register Block

Configuration

Memory (OTP)

(not with TMC2202)

(only TMC222x)

optional UART interface

IREF

Step Pulse

Generator

STEP

DIR

Step and Direction

motion control

Figure 1.1 TMC22xx basic application block diagram

THREE MODES OF OPERATION:

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

A CPU (µC) generates step & direction signals synchronized to additional motors and other

components within the system. The TMC22xx operates the motor as commanded by the configuration

pins and STEP/DIR signals. Motor run current either is fixed, or set by the CPU using the analog input

VREF. The pin PDN_UART selects automatic standstill current reduction. Feedback from the driver to

the CPU is granted by the INDEX and DIAG output signals. Enable or disable the motor using the ENN

pin.

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