New prod uc t ah1898 – Diodes AH1898 User Manual
Page 5
AH1898
Document number: DS36028 Rev. 1 - 2
5 of 11
February 2013
© Diodes Incorporated
NEW PROD
UC
T
AH1898
Application Note
Applications Circuit One – Low Band
Connecting the BSEL pin to ground permanently configures the AH1898 into its high sensitivity mode, requiring a reduced magnetic flux density
to activate its output (Low Band).
Applications Circuit Two – High Band
Connecting the BSEL pin to V
DD
or to a voltage greater than 1.4V or leaving the BSEL pin unconnected configures the AH1898 into its low
sensitivity mode, requiring a higher magnetic flux density to activate its output (High Band).
Applications Circuit Three – Adjustable Sensitivity
To enhance flexibility within the application, the sensitivity can be adjusted with a standard logic signal allowing it to be controlled by a micro-
controller or a logic source. This allows the sensitivity to be changed within the application without a hardware change. Whenever the sensitivity
band selection is changed, the band selection changeover should be allowed to complete for the output to be valid.