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L6482 データシート(PDF) 20 Page - STMicroelectronics |
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L6482 データシート(HTML) 20 Page - STMicroelectronics |
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20 / 73 page  Functional description L6482 20/73 Doc ID 023768 Rev 2 Figure 4. Charge pump circuitry 6.4 Microstepping The driver is able to divide the single step into up to 16 microsteps. Stepping mode can be programmed by the STEP_SEL parameter in the STEP_MODE register (Table 22). Step mode can only be changed when bridges are disabled. Every time the step mode is changed, the electrical position (i.e. the point of microstepping sinewave that is generated) is reset to the first microstep and the absolute position counter value (Section 6.5) becomes meaningless. Figure 5. Normal mode and microstepping (16 microsteps) V S V S + VCP D1 D2 V CP f PUMP to high-side gate drivers V S + VCP V D1 C BOOT C FLY D1 D2 VBOOT CP VDD V V Charge pump oscillator AM15034v1 step 1 step 1 step 2 step 3step 4 step 1 Reset position step 1 step 2 step 3step 4 Normal driving Microstepping PHASE A current PHASE B current PHASE A current PHASE B current microsteps 16 16 microsteps 16 16 Reset position microsteps microsteps microsteps AM15035v1 |
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