A1242

A1242 Two-Wire Chopper-Stabilized Hall Effect Latch Features and Benefits ▪ Chopper stabilization ▫ Superior temperature stability ▫ Extremely low switchpoint drift ▫ Insensitive to physical stress ▪ Reverse battery protection ▪ Solid-state reliability ▪ Small size ▪ Robust EMC capability ▪ High ESD ratings (HBM) Packages: 3 pin SOT23W (suffix LH), and 3 pin SIP (suffix UA) Description The A1242 Hall effect latch is a two-wire latch especially suited for operation over extended temperature ranges, from –40 to +150°C. Superior high-temperature performance is made possible through the Allegro dynamic offset cancellation technique, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. The current-switching output technique allows for the reduction in cost in the wiring harness because only two connections to the device are required. The current-switching output structure also inherently provides more immunity against EMC/ESD transients. These devices have low magnetic thresholds, thereby enabling more flexibility in the magnetic circuit design. The Hall effect latch will be in the high output current state in the presence of a magnetic South Pole field of sufficient magnitude and will remain in this state until a sufficient North Pole field is present. The A1242 includes the following on a single silicon chip: a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schm...