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The A1667 is a true zero-speed ring magnet sensor integrated circuit (IC) consisting of an optimized Hall IC available in two package options that provides a user-friendly solution for digital ring magnet sensing applications.
The sensor incorporates a dual element Hall IC that switches in response to differential magnetic signals created by a ring magnet. The IC contains a sophisticated compensating circuit designed to eliminate the detrimental effects of magnet and system offsets. Digital processing of the analog signal provides zero-speed performance independent of air gap and also dynamic adaptation of device performance to the typical operating conditions found in automotive applications (reduced vibration sensitivity).
High-resolution peak detecting DACs are used to set the adaptive switching thresholds of the device. Hysteresis in the thresholds reduces the negative effects of any anomalies in the magnetic signal associated with the targets used in many automotive applications.The open-drain output is configured for three-wire applications. This sensor is ideal for obtaining speed and duty cycle information using ring magnet based systems in applications such as automotive transmissions and industrial equipment.
The A1667 is available in a 4-pin SIP through-hole package (suffix K) and an 8-pin SOIC surface-mount package (suffix L). Both packages are lead (Pb) free with 100% matte-tin-plated leadframes.
|Document Type||Document Name|
|Application Note||Fundamental Properties of Speed Sensors|
|Application Note||Allegro Hall-Effect Sensor ICs|
|Guide||Guidelines for Designing Subassemblies Using Hall-Effect Devices|
|Guide||Hall-Effect IC Applications Guide|