L297/1

Overview

The L297/1 is a stepper motor controller IC designed for microcomputer-controlled applications. It generates four-phase drive signals for two-phase bipolar and four-phase unipolar step motors. The device supports half-step, normal, and wave drive modes with on-chip PWM chopper circuits for switch-mode current regulation. It requires only clock, direction, and mode input signals, reducing microprocessor burden. Key electrical parameters include a supply voltage range of 4.75V to 7V, an operating temperature range of -40°C to 150°C (TJ), and a 20-pin DIP package.

Feature Summary

• Generates internal phase drive signals for bipolar and unipolar motors
• Integrates PWM chopper circuits for switch-mode load current regulation
• Supports half-step, full-step, normal, and wave drive modes
• Requires minimal external components and simple interface signals

Applications

• Microcomputer-controlled stepper motor systems
• Bipolar and unipolar step motor drive interfaces
• Applications requiring reduced microprocessor programming burden

Procurement Notes

Verify the specific suffix '/1' against the manufacturer's official datasheet to confirm pinout and functional equivalence with other L297 variants. Ensure the selected package matches the required PCB layout constraints. Confirm RoHS3 compliance status if environmental regulations apply to the final assembly. Cross-reference ordering information with authorized distributors to avoid obsolete or non-standard packaging formats.

Selection Notes

Select this component when a dedicated stepper controller is needed to offload timing and sequencing tasks from the main processor. It is suitable for designs utilizing discrete transistors, Darlingtons, or monolithic bridge drivers like the L298N. Consider the 20-DIP package for through-hole prototyping or high-reliability manual assembly requirements where surface mount options are not preferred.

Part Context

The L297 series belongs to STMicroelectronics' family of stepper motor controllers. The L297/1 variant specifically denotes the Dual In-line Package (DIP) version. This controller is part of a broader ecosystem that includes complementary driver ICs, allowing designers to build complete motor control solutions using standard, widely available components from the same manufacturer.

Replacement Considerations

The L297D serves as a surface-mount equivalent in the SOIC package. Verify pin compatibility before substitution. No direct single-pin replacement is confirmed without schematic review.