Description
These chips will be pre-set to run on Pro Series laser machine V1, V2, and V3 NEMA 17 machines.
Description:
TMC2208 is an ultra-quiet two-phase stepper motor drive chip, continuous drive current 1.4A, peak current 2A, voltage range 4.75V-36V, 256 subdivision. The flexible microPlyer interpolation unit provides up to 256 subdivisions, allowing perfect sinusoidal control even in systems with limited pulse frequencies; these are also designed because stealthChop2 ultra-quiet technology is widely used in 3D printing. Compatible with existing 3D printer electronics, eliminating the expensive costs of redesign. With a standard step/dir interface, it is easy to use.
Features:
- UART configuration interface (9600-500k Baud)
- Power tube built-in drive current 1.4A ,peak current 2A, voltage range 4.75V-36V
- Up to 256 native microsteps (without interpolation)
- CoolStep ™ current dynamic adjustment technology, can save 70% of the energy
- stealthChop2 – faster motor acceleration/deceleration than stealthChop
- dcStep ™, stallGuard2 ™ stall detection technology
- Automatic stealthChop and spreadCycle switchover depending on velocity
- Hardware compatible with StepStick and Pololu A4988 Stepper Driver
- Components on bottom PCB side for better heat emission
- Automatic standby current reduction
- SteaClthhop mute technology
- spreadCycle – highly dynamic motor control chopper
Technical Specifications
| Model | TMC2208 |
|---|---|
| Interface | Step/Dir |
| Configuration | CFG Pins or UART |
| Native Microsteps | up to 1/256 |
| microPlyer Microsteps | 1/256 |
| Logic Voltage (VIO) | 3-5V |
| Motor Voltage (VM) | 5.5-36V |
| Motor Phase Current max | 1.2A RMS, 2.0A Peak |
| Internal V- Regulator | enabled |
| RDSon | <=0.3 Ohm |
| stealthChop (quiet) | yes |
| spreadCycle | yes |
| coolStep | no |
| stallGuard | no |
| dcStep | no |
Adjusting Current Limit
The current limit is pre-set to 1.2 amps for the PRO Series machine. To adjust it yourself, you can follow the procedure here.
The TMC2208 outputs continuous motor current up to 1.4A and peak current up to 2A. Therefore, the reference voltage of the driver module should not exceed 1V. At the same time, the driver module must be dissipated, otherwise it will affect the life of the driver module.
The best way to set the motor current is by measuring the voltage on the Vref pin (0…2.5V) and adjusting the voltage with the potentiometer. The maximum settable motor current is 1.77A RMS (0.11Ohm sense resistors), but the SilentStepSticks can only be used up to 1.2A RMS.
Irms = (Vref * 1.77A) / 2.5V = Vref * 0.71
Vref = (Irms * 2.5V) / 1.77A = Irms * 1.41 = Imax
Vref -> Voltage on Vref pin
Irms -> RMS (Root Mean Square) current per phase (Irms = Imax / 1.41)
Imax -> Maximum current per phase (Imax = Irms * 1.41)
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