IC for open/close detection in portable products
Diodes Incorporated
AH1891
DI has released what it says is the world's smallest dual output omnipolar Hall effect switch IC for open/close detection in portable, battery-powered products such as mobile phones and notebook PCs.
The dual-output AH1891 is optimised for operation over the supply voltage range 1.8 to 3.3V and offers a sleep function, assuring an average current consumption of 7uA.
Provided in a 0.8 x 0.8mm CSP package, the IC is said to be 13 times smaller than common three-leaded TSOT packaged alternatives and smaller than other DFN and SOT553 packaged parts.
The AH1891's PCB space-saving advantage is also complemented by a reduction in off-board height, with the IC's profile measuring less than 0.5mm.
In addition, the IC's integrated pull-up resistors help simplify the external applications circuit.
Being an omnipolar (north and south pole operated) and dual-output device, the AH1891 provides the design flexibility to suit a variety of low-power circuit architectures.
When a magnetic flux density is detected and exceeds the IC's operating point, output one is pulled low, while output two is inverted high, enabling different logic systems to be accommodated.
Output states are held until magnetic flux density is lower than the IC's release point.
With operating and release points optimised and stable over the temperature range -40 to 85C, the AH1891 is immune to the possibility of early or late switching effects.
The IC also offers good immunity to RF noise and other circuit stresses.
The AH1891 miniature omnipolar Hall effect switch is priced at USD0.20 (GBP0.12) each in 10,000-piece quantities.
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