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AH1894-FA-7

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AH1894
Document number: DS35741 Rev. 1 - 2
4 of 13
www.diodes.com
July 2013
© Diodes Incorporated
NEW PRODUCT
A
H1894
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
= +25C, 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.
AH1894
Document number: DS35741 Rev. 1 - 2
5 of 13
www.diodes.com
July 2013
© Diodes Incorporated
NEW PRODUCT
A
H1894
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.
AH1894
Document number: DS35741 Rev. 1 - 2
6 of 13
www.diodes.com
July 2013
© Diodes Incorporated
NEW PRODUCT
A
H1894
Application Notes (cont.)
Bands Select Change Timing and Valid Output
Whenever band selection BSEL pin input is changed, allow for band selection changeover to complete and stabilize. The output is valid only
after the second complete operating ‘awake’ phase after the band selection change is complete. Time taken for the output to be valid, after the
BSEL change, depends on timing of BSEL change during the sleep and awake phase; this time is up to 100ms typical and 200.1ms maximum
(TBC).
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AH1894-FA-7

Mfr. #:
Buy AH1894-FA-7
Manufacturer:
Description:
Magnetic Sensors Board Mount Hall Effect / Magnetic Sensors Prog HS Hall-Effect 1.6V to 3.6V Omni
Lifecycle:
New from this manufacturer.
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