A3422
Hall-Effect Direction Detection Sensor
3421.pdf
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Features
- Internal Direction-Decoding Circuitry
- Two Matched Hall Latches On A Single Substrate
- Superior Temperature Stability
- 4.5 V to 18 V Operation
- Electrically Defined Power-On State
- Under-Voltage Lockout
Description
The A3422xKA Hall-effect, direction-detection sensor is a new generation of special function integrated sensors that are capable of sensing the direction of rotation of a ring magnet. These transducers provide separate digital outputs that provide information on magnet rotation speed, direction, and magnet pole count. These devices eliminate the major manufacturing hurdles encountered in fine-pitch direction-detection applications, namely maintaining accurate mechanical location between the two active Hall elements. Here, the two Hall elements are photolithographically aligned to better than 1 µm, as contrasted with 100 µm or worse mechanical location tolerance when manufactured discretely. These highly sensitive, temperature-stable, magnetic transducers are ideal for use in digital-encoder systems in the harsh environments of automotive or industrial applications. The A3422xKA is a high-sensitivity device optimized for use with high-density magnets.
The A3422xKA monolithic integrated circuit contains two independent Hall-effect latches whose digital outputs are internally coupled to CMOS logic circuitry that decodes signal speed and direction. Extremely low-drift BiCMOS circuitry is used for the amplifiers to ensure symmetry between the two latches so that signal quadrature can be maintained. An on-chip voltage regulator allows the use of these devices from a 4.5 V to 18 V supply. This device has standard open-collector outputs.
Functional Block Diagram
|
Part Number |
Package Type | RoHS | Temperature |
| Compliant | |||
| A3422EKA | 5-pin SIP | No | -40 °C to 85 °C |
| A3422EKA-T | 5-pin SIP | Yes | -40 °C to 85 °C |
| A3422LKA | 5-pin SIP | No | -40 °C to 150 °C |
| A3422LKA-T | 5-pin SIP | Yes | -40 °C to 150 °C |
