| Pin |
Symbol |
Description |
| 1 | SYNC | Output of the on-chip oscillator. |
| 2 | GND | Ground |
| 3 | HOME | Open collector output that indicates when the L297 is in its initial state(ABCD=0101). |
| 4 | A | Motor phase A drive signal for power stage. |
| 5 | INH1(ACTIVE LOW) | Active low inhibit control for driver stage of A and B phases. |
| 6 | B | Motor phase B drive signal for power stage. |
| 7 | C | Motor phase C drive signal for power stage. |
| 8 | INH2(ACTIVE LOW) | Active low inhibit control for driver stage of C and D phases. |
| 9 | D | Motor phase D drive signal for power stage. |
| 10 | ENABLE | Chip enable input. When low INH1,INH2,A,B,C and D are brought low. |
| 11 | CONTROL | When low chopper acts on INH1 and INH2, When HIGH chopper acts on phase lines ABCD. |
| 12 | VS | 5v supply input |
| 13 | SENSE 2 | Input for load current sense voltage from power stages of phases C and D. |
| 14 | SENSE 1 | Input for load current sense voltage from power stages of phases A and B. |
| 15 | VREF | Reference voltage for chopper circuit. A voltage applied to this pin determines the peak load current. |
| 16 | OSC | An RC network connected to this pin determines the chopper rate. |
| 17 | CW/CCW(ACTIVE LOW) | Clcokwise/Counterclockwise direction control input. |
| 18 | CLOCK(ACTIVE LOW) | An active low pulses on this input advances the motor one increment. |
| 19 | HALF/FULL(ACTIVE LOW) | When HIGH selects half step operation, when LOW selects full step operation. |
| 20 | RESET(ACTIVE LOW) | Restores the translator to the home position(state 1, ABCD = 0101). |
