Halogen and Antimony Free. “Green” Device (Note 3)
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Notes:
Typical Applications Circuit
Note:
4. C
IN
is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical.
6. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
7. The absolute maximum V
DD
of 6V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to
operate the device at the absolute maximum rated conditions for any period of time.
Recommended Operating Conditions
(@T
A
= +25°C, unless otherwise specified.)
Symbol
V
DD
T
A
Parameter
Supply Voltage
Operating Temperature Range
Operating
Operating
Conditions
Rating
1.6V to 3.6V
-40 to +85
Unit
V
°C
Electrical Characteristics
(@T
A
= +25°C, V
DD
= 1.85V, unless otherwise specified.)
Symbol
V
OL
V
OH
Ioff
V
SEL_LB
V
SEL_HB
R
PD_BSEL
I
DD
(awake)
Supply Current
I
DD
(sleep)
I
DD
(avg)
Tawake
Tperiod
D.C.
Notes:
Parameter
Output Low Voltage (on)
Output High Voltage (off)
Output Leakage Current
BSEL pin input voltage – Low Band
BSEL pin input voltage – High Band
BSEL pin internal pull-down resistor
Conditions
I
OUT
= 1mA
I
OUT
= -1mA
V
OUT
= 3.6V, Output off
Min
—
V
DD
-0.2
-
0
1.4
—
—
—
—
—
—
—
—
Typ
0.1
V
DD
-0.1
<
0.1
—
—
50
2.1
2.5
4.3
7.2
50
50
0.1
Max
0.2
—
1
0.5
3.6
—
—
—
8
13
100
100
—
Unit
V
V
µA
V
V
kΩ
mA
mA
µA
µA
µs
ms
%
(Note 8)
During ‘awake’ period,
T
A
= +25°C, V
DD
= 3V
During ‘sleep’ period,
T
A
= +25°C, V
DD
= 3V
T
A
= +25°C, V
DD
= 1.85V
T
A
= +25°C, V
DD
= 3.6V
(Note 9)
(Note 9)
(Note 10)
Average Supply Current
Awake Time
Period
Duty Cycle
8. BSEL pin internal pull-down resistor is only active during AWAKE time
9. When power is initially on, the operating V
DD
(1.6V to 3.6V) must be applied to guarantee the output sampling.
The output state is valid after the second operating phase (typical 100ms).
10. Transition time varies dependant on the timing of BSEL activation during the sleep and awake phases.
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).
NEW PRODUCT
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.
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