Bipolar Stepper Motor Driver User Manual
Contents
1. All Mikroelektronika s development systems feature a large number of peripheral modules expanding microcontroller s range of application and making the process of program testing easier In addition to these modules it is also possible to use numerous additional modules linked to the development system through the I O port connectors Some of these additional modules can operate as stand alone devices without being connected to the microcontroller 7 MikroElektronika SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD waking ib siw ple Bipolar Stepper Motor Driver The Bipolar Stepper Motor Driver additional board is designed to operate bipolar stepper motors in full half quarter and eight step modes It is available as a stand alone device or connected to the microcontroller For connecting the Bipolar Stepper Motor Driver to the microcontroller on the development system it is necessary to use a flat cable with regular IDC female connector that should be connected to some development system s I O port Figure 1 Bipolar Stepper Motor Driver Figure 2 Bipolar Stepper Motor Driver connected to a development system The operation of the Bipolar Steper Motor Driver is based on the A3967SLB circuit It is an integrated circuit specialized for driving step motors with output driver capability of up to 30V and current up to 750mA The circuit features thermal shutdown protection crossover current p2. ENT 38 3 70 7 100 Figure 7 8 Microstep mode MS1 1 MS2 1 DIR 1 MikroElektronika
3. rotection and under voltage lockout Its operation mode depends on the logic state of 7 input pins Their funtions are illustrated in Table 1 Input Active state Function ENABLE 0 This active low input enables all of the outputs STEP 0 1 A low to high transition on this input advances the motor one increment The size of the increment is determined by the state of inputs MS1 and MS2 This active low input turns off all of the outputs STEP inputs are ignored until the RESET input goes RESET 0 high SLEEP 0 This active low control input is used to minimize power consumption when not in use MS1 0 1 Select the microstepping format as per Table 2 MS2 0 1 Select the microstepping format as per Table 2 DIR 0 1 The state of this input determines the direction of rotation of the motor Table 1 Bipolar Stepper Motor Driver input pins functional description Bipolar stepper motors stator features two independent coils A and B Their ending terminals should be connected to the CN3 and CN4 connectors OUT1A OUT1B OUT2A and OUT2B pins A voltage used for driving these coils is supplied on the CN2 connector and amounts to up to 30V Figure 3 Bipolar Stepper Motor Driver connection schematic MikroElektronika The Bipolar Stepper Motor Driver additional board enables you to drive the motor in various M step modes The size of one increment resolu
4. tion is equal to a movement of rotor generated by one pulse on step input The resolution is determined by logic state on MS1 and MS2 inputs as shown in Table 2 STEP INPUT 70 7 PHASE 1 CURRENT 70 7 SLOW DECAY 70 7 PHASE 2 CURRENT 70 7 Figure 4 Full Step mode MS1 0 MS2 0 DIR 1 SLOW MIXED sLow MIXED A pecay gt I pecay pecay 1 Decay 100 70 7 38 3 PHASE 1 CURRENT 38 3 70 7 100 MIXED SLOW MIXED SLOW pecay gt I pecay gt pecay gt DECAY 100 70 7 38 3 PHASE 2 CURRENT 38 3 70 7 Figure 6 Quarter Step mode MS1 0 MS2 1 DIR 1 S1 MS2 Resolution 0 0 Full step 1 0 Half step 0 1 Quarter step 1 1 8 Microstep Table 2 Resolution Truth Table STEP weor J LULU LULU UU e 100 70 7 PHASE 1 CURRENT 70 7 100 100 70 7 qe PHASE 2 CURRENT 70 7 100 Figure 5 Half Step mode MS1 1 MS2 0 DIR 1 DECAY y seur UULU L INPUT sLow MIXED SLow MIXED 4 pecay P4 pecay J pecay IM decay 100 70 7 38 3 PHASE 1 CURRENT 38 3 70 7 100 MIXED sLow MIXED SLOW M pecay 4 pecay P4 pecay f4 Decay 100 70 7 38 3 PHASE 2 CURR
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