A1128 Datasheet | Allegro MicroSystems

Highly Programmable Hall-Effect Switch Features AND BENEFITS - Chopper stabilization for stable switchpoints throughout operating temperature range - Externally programmable: ▫ Operate point (through the VCC pin) ▫ Output polarity ▫ Output fall time for reduced EMI in automotive applications - On-board voltage regulator for 3 to 24 V operation - On-chip protection against: ▫ Supply transients ▫ Output short-circuits ▫ Reverse battery condition PACKAGES: 3-pin SIP (suffix UA, TS leadform) LAST-TIME BUY 3-pin SOT89 (suffix LT) 3-pin SIP (suffix UA) Not to scale DESCRIPTION The A1128 is a field-programmable, unipolar Hall-effect switch designed for use in high-temperature applications. This device uses a chopper-stabilization technique to eliminate offset inherent in single-element devices. The devices are externally programmable. A wide range of programmability is available on the magnetic operate point, BOP , while the hysteresis remains fixed. This advanced feature allows optimization of the sensor IC switchpoint and can drastically reduce the effects of mechanical placement tolerances found in end-use production environments. A proprietary dynamic offset cancellation technique, with an internal high-frequency clock, reduces the residual offset voltage, which is normally caused by device overmolding, temperature dependencies, and thermal stress. Having the Hall element and amplifier in a single chip minimizes many problems normally associated with low-level analog signals. Two package styles provide a magnetically optimized package for most applications. Type LT is a miniature SOT89/TO-243AA surface mount package that is thermally enhanced with an exposed ground tab, and type UA is a three-lead ultramini SIP for through-hole mounting. The packages are lead (Pb) free, with 100% matte-tin-plated leadframes. V+ VCC CBYPASS Functional Block Diagram Regulator Trim Control To All Subcircuits TC Trim Switchpoint Dynamic Offset Cancellation Amp Si...