Two-wire Hall-effect latch for increased protection against high-voltage transients
The improvement in noise and switch-point drift allows the device to realise much better switching accuracy, which means better switching repeatability. Moreover, the improved high-voltage transient protection allows the A1244 to survive the conditions specified in ISO 7637-2 and 40 V load dump. Allegro’s advanced BiCMOS wafer fabrication process is used to achieve magnetic stability over temperature and to eliminate the offset inherent in
single-element devices when exposed to harsh application environments. Two-wire latches are particularly advantageous in cost-sensitive applications, such as automotive transmission position sensing and motor commutations applications, because they require one less wire for operation compared with the more traditional open-collector output latches. In addition, the user inherently gains diagnostic capabilities, because there is always current flowing at one of two specified levels. Any output current outside these two narrow ranges is a fault condition.
The A1244 is available in two package styles: the "LH" is a SOT-23W style, miniature low-profile package for surface-mount applications, and the "UA" is a TO-92 style, three-lead ultra-miniature single inline package (SIP) for through-hole mounting. The A1244 is also offered with two supply-current options: -I1 from 5.0 to 6.9 mA, and -I2 from 2.0 to 5.0 mA.
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