Diodes AH1898 - Manual (Page 4)

AH1898
Document number: DS36028 Rev. 1 - 2
4 of 11
www.diodes.com
February 2013
© Diodes Incorporated
NEW PROD
UC
T
AH1898
Magnetic Characteristics
(Note 10 & 11) (T
A
= +25°C, V
DD
= 1.6V to 3.6V, unless otherwise specified)
(1mT=10 Gauss)
BSEL Symbol Characteristics Min Typ Max Unit
Low Bops
LB
(south pole to part marking side side)
Low Band - Operation Point
18 35 55
Gauss
Low Bopn
LB
(north pole to part marking side side) -55 -35 -18
Low Brps
LB
(south pole to part marking side side)
Low Band - Release Point
12 25 45
Low Brpn
LB
(north pole to part marking side side) -45 -25 -12
High Bops
HB
(south pole to part marking side side)
High Band - Operation Point
43 60 80
High Bopn
HB
(north pole to part marking side side) -80 -60 -43
High Brps
HB
(south pole to part marking side side)
High Band - Release Point
35 50 70
High Brpn
HB
(north pole to part marking side side) -70 -50 -35
Bhy (|Bopx|-|Brpx|) Hysteresis — 10 —
Notes: 10. Typical data is at T A = +25 C, V
DD
= 1.8V.
11. Magnetic characteristics may vary with operating temperature and after soldering.
The AH1898 includes a band select pin (BSEL) so that the operate (Bops and Bopn) and release (Brps and Brpn) points can be adjusted between
two pre-defined ranges. The BSEL can be hard wired within the application circuit or the band can be selected on the fly by using the BSEL pin as
a logic input. This feature allows the AH1898 sensitivity to be changed by firmware within the application without the addition of any external
components. If the BSEL pin is left open circuit the AH1898 defaults to high band.