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STA6940M Datasheet(PDF) 6 Page - Allegro MicroSystems |
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STA6940M Datasheet(HTML) 6 Page - Allegro MicroSystems |
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6 / 19 page  Brushed DC Motor Driver IC With PWM Control STA6940M 6 Basic Motor Control Functions There are four states of motor output: free (coast), forward, reverse, and brake. This section describes the inputs and the MOSFET outputs that set these states. Free (Coast) This state is set by low signals on both the IN1 and the IN2 logic inputs. All MOSFETs are turned off, and no current flows through the device to the motor. The motor is totally free to spin. The MOSFET states are shown in figure 1(A). Forward This state is set by a high signal on the IN1 input and a low signal on the IN2 input. The high-side MOSFET on the OA side is turned on, and the low-side MOSFET on the OB side is turned on. Current flows through the device to drive motor rotation (the terms "forward" and "reverse" only serve to indicate opposite relative directions). The MOSFET states are shown in figure 1(B). Reverse This state is set by a low signal on the IN1 input and a high signal on the IN2 input. The low-side MOSFET on the OA side is turned on, and the high-side MOSFET on the OB side is turned on. Current flows through the device to drive motor rota- tion (the terms "forward" and "reverse" only serve to indicate opposite relative directions). The MOSFET states are shown in figure 1(C). Brake This state is set by high signals on both the IN1 and the IN2 logic inputs. Both high-side MOSFETs are turned off, and both low-side MOSFETs are turned on. The motor coils are shorted together providing resistance to rotation. The MOSFET states are shown in figure 1(D). Motor VM OA OB OFF OFF OFF OFF Rs Motor VM OA OB ON OFF OFF ON IM Rs Motor VM OA OB OFF ON ON OFF IM Rs Motor VM OA OB OFF OFF ON ON Rs Figure 1. The panels demonstrate the MOSFET switching conditions and the resulting current flow for each of the four motor control states. (A) Free (coast) (B) Forward (C) Reverse (D) Brake Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com |
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