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The L297 integratesall the control circuitry required to control bipolar and unipolar steppermotors. Used with a dual bridge driver such as the L298N forms a complete microprocessor-to-bipolar stepper motor interface. Unipolar stepper motor can be driven with an L297 plus a quad darlington array. This note describes the operation of the circuit and shows how it is used.
Don't connect Vref to +5V. The maximum input is 3V!!
If you are using the +5V then at least use a resistor divider. For instance, put two 10 kOhm resistors in series and connect the ends to the 0V and +5V. The center connection then goes to the Vref input, which should be about 2.5V then (I assume the input impedance of the Vref input is relatively high)
Depending on the motor you use (and/or the capabilities of the driver/output drive), you have to set the current. You have to look at the specificatiosn of the driver and/or motor to find out which is an absolute maximum allowed current. Then set your 'protection' somewhat lower (75% ??).
If you are using the L298 as a driver, then this one can drive a maximum (!) current of 4A. The continuous current for this device is 2A, so in this case you would set the 'protection' to 2A (2.5V/2A = 1.25 ohm).
Half/full step select input. When high selects half step operation,
when low selects full step operation. One-phase-on full step mode
is obtained by selecting FULL when the L297’s translator is at an
even-numbered state.
Two-phase-on full step mode is set by selecting FULL when the
translator is at an odd numbered position. (The home position is
designate state 1).
without knowing the requirements of the motor things will stay 'experimental'
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