New prod uc t ah1894 – Diodes AH1894 User Manual
Page 5
AH1894
Document number: DS35741 Rev. 1 - 2
5 of 13
July 2013
© Diodes Incorporated
NEW PROD
UC
T
AH1894
Application Notes
Applications Circuit 1 – Low Band
Leaving the BSEL pin unconnected or connecting the BSEL pin to ground permanently configures the AH1894 into its high sensitivity mode
(lower switching thresholds), requiring a reduced magnetic flux density to activate its output (Low Band).
Applications Circuit 2 – High Band
Connecting the BSEL pin to V
DD
or applying a voltage greater than 1.4V configures the AH1894 into its low sensitivity mode (higher switching
threshold), requiring a higher magnetic flux density to activate its output (High Band).
Applications Circuit 3 – Adjustable Sensitivity
To enhance the 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, allow for band selection changeover to complete and output to be valid.