Datasheet

TMC262 / TMC262C DATASHEET (Rev. 2.22 / 2019-FEB-22) 61
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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 2 Standard application circuit .............................................................................................................................. 9
Figure 4.1 StallGuard2 load measurement SG as a function of load .................................................................. 10
Figure 4.2 Linear interpolation for optimizing SGT with changes in velocity .................................................. 12
Figure 5.1 Energy efficiency example with CoolStep ............................................................................................... 14
Figure 5.2 CoolStep adapts motor current to the load ........................................................................................... 15
Figure 6.1 SPI Timing ........................................................................................................................................................ 17
Figure 6.2 Interfaces to a TMC429 motion controller chip and a TMC262 motor driver ............................... 18
Figure 7.1 STEP/DIR timing .............................................................................................................................................. 29
Figure 7.2 Internal microstep table showing the first quarter of the sine wave ........................................... 30
Figure 7.3 MicroPlyer microstep interpolation with rising STEP frequency ...................................................... 31
Figure 8.1 Sense resistor grounding and protection components ...................................................................... 34
Figure 9.1 Chopper phases .............................................................................................................................................. 35
Figure 9.2 No ledges in current wave with sufficient hysteresis (magenta: current A, yellow & blue:
sense resistor voltages A and B) ................................................................................................................................... 37
Figure 9.3 SpreadCycle chopper mode showing the coil current during a chopper cycle ........................... 37
Figure 9.4 Constant off-time chopper with offset showing the coil current during two cycles ................ 39
Figure 9.5 Zero crossing with correction using sine wave offset ........................................................................ 39
Figure 10.1 MOSFET gate charge vs. V
DS
for a typical MOSFET during a switching event ............................ 42
Figure 11.1 Short to GND detection timing ................................................................................................................ 43
Figure 11.2 Undervoltage reset timing ......................................................................................................................... 46
Figure 13.1 Start-up requirements of CLK input ........................................................................................................ 48
Figure 16.1 Schematic of TMC262-EVAL (power part) ............................................................................................... 52
Figure 16.2 Layout example ............................................................................................................................................. 53
Figure 19.1 Dimensional drawings ................................................................................................................................ 59