Date: 17th Apr 2011
0.8mm x 0.8mm CSP packaged hall Effect
switch from Diodes
Diodes Incorporated has released dual output omni polar
Hall effect switch IC, specifically designed for open/close
detection in portable, battery-powered products including
cell phones and notebook PCs.
The dual output AH1891 is optimized for operation over
the supply voltage range 1.8V to 3.3V and offers a sleep
function at an average current consumption of 7µA.
Provided in an 0.8mm x 0.8mm CSP package, the IC is some
13 times smaller than common 3-leaded TSOT packaged alternatives
and is significantly 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. Diodes claims this is the word's smallest hall
effect switch IC.
Being an omni polar (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 1 is pulled low while output 2 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 optimized and stable
over the temperature range -40ºC to 85ºC, the
AH1891 is immune to the possibility of early or late 2 switching
effects. The IC also offers good immunity to RF noise and
other circuit stresses.
For more information, visit www.diodes.com.
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