New prod uc t ah1903 – Diodes AH1903 User Manual
Page 5
AH1903
Document number: DS36568 Rev. 2 - 2
5 of 12
January 2014
© Diodes Incorporated
NEW PROD
UC
T
AH1903
Application Notes
The AH1903 includes a Hall switch function select pin (SEL) so that the AH1903 can be changed between an Unipolar or an Omnipolar Hall
Switch operation to fit a multitude of applications. The diagrams below show the different switching functions between the Unipolar and the
Omnipolar Hall switch types.
AH1903 in Unipolar Operation
AH1903 in Omnipolar Operation
The AH1903 includes a function select pin (SEL) to change the device type between Unipolar and Omnipolar operations. The SEL pin can be
hard wired within the application circuit or can be changed on the fly by using the SEL pin as a logic input. This feature allows the AH1903
operating mode to be changed by firmware within the application without the addition of any external components. If the SEL pin is left open
circuit the AH1903 defaults to Unipolar mode.