TMC262 DATASHEET (Rev. 2.07 / 2013-FEB-14)
57
22 Table of Figures
Figure 1.1 Applications block diagrams.........................................................................................................................4
Figure 2.1 TMC262 pin assignments................................................................................................................................6
Figure 3.1 TMC262 block diagram....................................................................................................................................8
Figure 4.1 stallGuard2 load measurement SG as a function of load....................................................................9
Figure 4.2 Linear interpolation for optimizing SGT with changes in velocity..................................................11
Figure 5.1 Energy efficiency example with coolStep................................................................................................13
Figure 5.2 coolStep adapts motor current to the load............................................................................................14
Figure 6.1 SPI Timing........................................................................................................................................................16
Figure 6.2 Interfaces to a TMC429 motion controller chip and a TMC262 motor driver...............................17
Figure 7.1 STEP/DIR timing..............................................................................................................................................27
Figure 7.2 Internal microstep table showing the first quarter of the sine wave...........................................28
Figure 7.3 microPlyer microstep interpolation with rising STEP frequency......................................................29
Figure 8.1 Sense resistor grounding and protection components......................................................................32
Figure 9.1 Chopper phases ..............................................................................................................................................33
Figure 9.2 spreadCycle chopper mode showing the coil current during a chopper cycle...........................35
Figure 9.3 Constant off-time chopper with offset showing the coil current during two cycles................36
Figure 9.4 Zero crossing with correction using sine wave offset........................................................................36
Figure 10.1 MOSFET gate charge vs. VDS for a typical MOSFET during a switching event............................39
Figure 11.1 Short to GND detection timing................................................................................................................40
Figure 11.2 Undervoltage reset timing.........................................................................................................................42
Figure 15.1 High-current, high-voltage power stage using external gate drivers (minimum part count)46
Figure 15.2 High-current power stage using external gate drivers with short to GND protection............47
Figure 16.1 Layout example.............................................................................................................................................49
Figure 19.1 Dimensional drawings................................................................................................................................55
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