"A4985步进电机马达驱动芯片完整手册：特性、优势及应用"

Summary： The A4985 is a highly functional and versatile motor driver chip specifically designed for driving bipolar stepper motors. This chip is equipped with a built-in translator, making it incredibly easy to operate. It offers multiple step modes including full, half, quarter, and eighth-step modes, which can be selected using MSx logic inputs. The A4985 has an impressive output drive capacity of up to 35V and ±1A. One of the notable features of the A4985 is its fixed off-time current regulator, which can operate in Slow or Mixed decay modes. This allows for efficient control and regulation of the current flow. Additionally, the chip includes a range of features such as automatic current decay mode detection and selection, synchronous rectification for low power dissipation, internal UVLO (Under Voltage Lock Out) to protect against voltage drops, and crossover-current protection to prevent excessive current flow. The A4985 is also compatible with 3.3V and 5V logic supplies, offering flexibility in various applications. It comes in thin profile QFN (Quad Flat No-leads) and TSSOP (Thin Shrink Small Outline Package) packages, making it suitable for space-constrained designs. In terms of safety, the A4985 is designed with thermal shutdown circuitry to prevent overheating and potential damage. It also includes protection against short-to-ground and shorted load conditions. Furthermore, the chip features a low-current Sleep mode, consuming less than 10µA, which can help conserve power when not in use. Lastly, the A4985 complies with the No Smoke No Fire (NSNF) regulation, ensuring its safety and reliability. Overall, with its comprehensive set of features and benefits, the A4985 proves to be a reliable and efficient choice for driving stepper motors in various applications.