Diodes AH1894 - Manual (Page 4)

AH1894
Document number: DS35741 Rev. 1 - 2
4 of 13
www.diodes.com
July 2013
© Diodes Incorporated
NEW PROD
UC
T
AH1894
Electrical Characteristics
(cont.)
Magnetic Characteristics
(Note 11 &12) (T A = -40°C to +85°C, V DD = 1.85V, unless otherwise specified)
(1mT=10 Gauss)
BSEL Symbol Characteristics Min Typ Max Unit
Low Bops
LB
(South pole to part marking side)
Low Band - Operation Point
15 30 45
Gauss
Low Bopn
LB
(North pole to part marking side) -45 -30 -15
Low Brps
LB
(South pole to part marking side)
Low Band - Release Point
10 20 35
Low Brpn
LB
(North pole to part marking side) -35 -20 -10
High Bops
HB
(South pole to part marking side)
High Band - Operation Point
25 40 55
High Bopn
HB
(North pole to part marking side) -55 -40 -25
High Brps
HB
(South pole to part marking side)
High Band - Release Point
20 30 45
High Brpn
HB
(North pole to part marking side) -45 -30 -20
— Bhy (|Bopx|-|Brpx|) Hysteresis — 10 —
Notes: 11. Typical data is at T
A
= +25 C, V
DD
= 1.85V.
12. Maximum and minimum parameters values over the operating temperature range are not tested in production, they are guaranteed by design, process
control and characterization. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
The AH1894 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 AH1894 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 AH1894 defaults to low band.