Maxim dual, 2-wire, Hall-effect sensor interface provides flexibility through analog and digital outputs
Maxim Integrated Products has introduced the MAX9621, a dual, 2-wire, Hall-effect sensor interface with analog and digital outputs. The device enables the microprocessor to monitor the status of Hall-effect sensors either through the analog output by mirroring the sensor current for linear information or through the filtered digital output. The input current threshold can be programmed for the digital output. A high-side current-sense architecture eliminates the need for a ground-return wire without introducing ground shift, thus reducing wiring cost by 50%, according to the company. Applications include automotive body controllers, such as window lifters.
The MAX9621 protects sensors from supply transients up to 60V and short-to-ground conditions, which enables it to withstand the harsh operating conditions in automotive applications. The device features a minimum of 50microseconds blanking time following Hall-effect sensor power-up or restart. A low-current (1microamp, typical) shutdown mode conserves power.
Available in a 3mm x 5mm, 10-pin microMAX® package, the MAX9621 operates from a 5.5V to 18V supply and is fully specified over the -40 degrees Celsius to +125 degrees Celsius automotive temperature range. Pricing starts at $0.87 (1000-up, FOB USA). Evaluation kits are available upon request.
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