Datasheet

TMC2300 DATASHEET (Rev. 1.02 / 2019-NOV-06) 7

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by the microstep resolution. An internal table translates the counter value into the sine and cosine

values which control the motor current for microstepping.

1.3.2 Internal Step Pulse Generator

Some applications do not require a precisely co-ordinated motion – the motor just is required to

move until a certain event occurs, or a certain distance is passed. The TMC2300 comes with an

internal pulse generator for these applications: Just provide the velocity via UART interface to move

the motor. The velocity sign automatically controls the direction of the motion. This way, the motor

will move without processor pulse generation. The processor just needs to terminate motion, when

the target is reached, e.g. by polling the microstep counter. However, the pulse generator does not

integrate a ramping function. Motion at higher velocities will require ramping up and ramping down

the velocity value via software.

STEP/DIR mode and internal pulse generator mode can be mixed in an application!

1.4 StealthChop2 Driver

StealthChop is a voltage chopper-based principle. It is optimum especially for low voltage operation,

because microstepping sine waves are generated even at 100% duty cycle. It especially guarantees

that the motor is absolutely quiet in standstill and in slow motion, except for noise generated by

bearings. Unlike other voltage mode choppers, StealthChop2 does not require any configuration. It

automatically learns the best settings during the first motion after power up and further optimizes the

settings in subsequent motions. An initial homing sequence is sufficient for learning. StealthChop2

allows high motor dynamics, by reacting at once to a change of motor velocity.

Benefits of using StealthChop2:

- Significantly improved microstepping with low cost motors

- Motor runs smooth and quiet

- Absolutely no standby noise

- Reduced mechanical resonance yields improved torque

1.5 StallGuard4 – Load Sensing

StallGuard4 provides an accurate measurement of the load on the motor. It can be used for stall

detection as well as other uses at loads below those which stall the motor, such as CoolStep load-

adaptive current reduction. This gives more information on the drive, allowing functions like

sensorless homing and diagnostics of the drive mechanics.

1.6 CoolStep – Load Adaptive Current

CoolStep drives the motor at the optimum current. It uses the StallGuard4 load measurement

information to adjust the motor current to the minimum amount required in the actual load situation.

This saves energy and keeps the components cool.

Benefits are:

- Energy efficiency power consumption decreased up to 90% (w. no load on motor)

- Motor generates less heat improved mechanical precision

- Less or no cooling improved reliability

- Use of smaller motor less torque reserve required → cheaper motor does the job

- Less motor noise Due to less energy exciting motor resonances

Figure 1.4 shows the efficiency gain of a 42mm stepper motor when using CoolStep compared to

standard operation with 50% of torque reserve. coolStep is enabled above 60RPM in the example.

UART