PART OBSOLETE - USE
AH1898
/
AH1892
AH1891
MINIATURE MICROPOWER OMNIPOLAR
HALL EFFECT SWITCH
Description
The AH1891 is a minature micropower Omnipolar Hall effect switch
IC with dual outputs, specifically designed for portable and battery
powered equipment such as cellular phones and portable PCs. To
support battery powered equipment the AH1891 is optimized to
operate over the supply range of 1.8V to 3.3V and uses a sleep
function to give an average supply current of only 7µA. To minimize
PCB space the AH1891 is packaged in the small CSP package
(0.8mmx0.8mm) and the design integrates the external pull up
resistors to simplify the applications circuit.
The outputs of the AH1891 are switched with either a North or South
pole of sufficient strength. When the magnetic flux density (B) is
larger than operate point (Bop), Output 1 will pull low and Output 2
will be inverted (high). The output states are held until B is lower than
release point (Brp).
The AH1891 is available in U-WLB0808-4 package.
Pin Assignments
(Top View)
A1
A2
A2
A1
NEW PRODUCT
OBSOLETE – PART DISCONTINUED
(Bottom View)
B2
B1
B1
B2
Features
Omnipolar (North or South) operation
Low Supply Voltage of 1.8V to 3.3V
Micropower Operation
Dual Outputs for Design Flexibility
Internal Pull Up and Pull Down Capability
Chopper stabilized design for:
-
Superior temperature stability
-
Superior temperature stability
-
Superior temperature stability
Good RF Noise Immunity
-40°C to 85°C Operating Temperature
ESD
＞
4KV in Human Body Mode
Miniature CSP package 0.8mm x 0.8mm
Applications
Cellular Phones
Portable PCs and PDAs
Digital Cameras
Portable and Battery Powered Applications
Typical Application Circuit
Vdd
Output 1
AH1891
Output 2
GND
AH1891
Document number: DS35207 Rev. 2 - 4
1 of 7
www.diodes.com
May 2016
© Diodes Incorporated
AH1891
Pin Descriptions
Pin #
Pin Name
Out 1
Out 2
GND
Vdd
Description
Output Pin ( active low )
Output Pin (active high)
Ground
Power Supply Voltage
A1
A2
B1
B2
NEW PRODUCT
OBSOLETE – PART DISCONTINUED
Functional Block Diagram
Vdd
Hall
Plate
Power
switch
Offset
Cancelling
Amp
Latch
Out1
Output
Controller
Hall
Plate
GND
Vdd
Absolute Maximum Ratings
(T
A
= 25C)
Symbol
Vdd
B
T
A
Ts
P
D
T
J
Supply voltage
Magnetic flux density
Operating Temperature Range
Storage Temperature Range
Package Power Dissipation
Maximum Junction Temperature
Parameter
Values
5
Unlimited
-40 to +85
-65 to +150
166
150
C
C
mW
C
Unit
V
Recommended Operating Conditions
(T
A
= 25C)
Symbol
Vdd
Parameter
Supply Voltage
Conditions
Operating
Rating
1.8 to 3.3
Unit
V
Offset
Cancelling
Amp
Latch
Out2
GND
AH1891
Document number: DS35207 Rev. 2 - 4
2 of 7
www.diodes.com
May 2016
© Diodes Incorporated
AH1891
Electrical Characteristics
(
T
A
= +25°C, Vdd = 1.8V, unless otherwise specified)
Symbol
Parameter
Output On Voltage (High side)
Output On Voltage (Low side)
Output Leakage Current
Supply Current
Awake Time
Period
Duty Cycle
Conditions
I
O
= -0.5mA
I
O
= 0.5mA
Output off
Chip enable
Chip disable
Average supply current
-
-
-
Min
Vdd-0.2
-
-
-
-
-
-
-
-
Typ.
-
-
<0.1
2
5
7
50
50
0.1
Max
-
0.2
1
4
8
12
100
100
-
Unit
V
V
µA
mA
µA
µA
µs
ms
%
V
OH
V
OL
Ioff
Idd(en)
Idd(dis)
Idd(avg)
Tawake
Tperiod
D.C.
NEW PRODUCT
OBSOLETE – PART DISCONTINUED
Magnetic Characteristics
(T
A
= 25C, Vdd = 1.8V~3.3V, Note 1)
(1mT=10 Gauss)
Symbol
Bops(south pole to brand side)
Bopn(north pole to brand side)
Brps(south pole to brand side)
Brpn(north pole to brand side)
Bhy(|Bopx|-|Brpx|)
Notes:
Parameter
(Note 2)
Operate Point
Release Point
Hysteresis
Min
20
-60
12
-50
-
Typ.
40
-40
25
-25
15
Max
60
-20
50
-12
-
Unit
Gauss
1. Typical data is at T
A
= 25C, Vdd = 3V, and for design information only.
2. Operate point and release point will vary with supply voltage and operating temperature.
AH1891
Document number: DS35207 Rev. 2 - 4
3 of 7
www.diodes.com
May 2016
© Diodes Incorporated
AH1891
Typical Operating Characteristics
Switch Points Bop and Brp vs. Temperature
NEW PRODUCT
OBSOLETE – PART DISCONTINUED
Switch points vs. Temperature
Vdd = 1.8V
60
40
Bops
Brps
Bopn
Brpn
Bhy_S
Bhy_N
Switch points vs. Temperature
Vdd = 3.3V
60
40
Bops
Brps
Bopn
Brpn
Bhy_S
Bhy_N
Gauss (G)
0
-20
-40
-60
-55 -40 -25 -10
5
20
35
o
Gauss (G)
20
20
0
-20
-40
-60
50
65
80
95
-55 -40 -25 -10
5
20
35
o
50
65
80
95
Temperature ( C)
Temperature ( C)
Switch Points Bop and Brp vs. Supply Toltage
Switch points vs. Supply voltage
T
A
= 25
o
C
60
40
Gauss (G)
20
0
-20
-40
-60
1.5
1.8
2.1
2.4
2.7
3
3.3
Bops
Brps
Bopn
Brpn
Bhys_S
Bhys_N
Supply voltage Vdd (V)
Average Supply Current vs. Temperature
Average supply current vs. Temperature
Vdd = 1.8V and 3.3V
40
35
30
25
20
15
10
5
0
-55 -40 -25 -10
5
20
35
50
65
80
95
1.8V
3.3V
Average Supply Current vs. Supply Voltage
Average supply current vs. Supply voltage
T
A
= 25
o
C
Avg. Supply Current Idd (uA)
20
18
15
13
10
8
5
3
0
1.5
1.8
2.1
2.4
2.7
3
3.3
Idd(avg)
Avg. Supply Current Idd (uA)
Temperature (
o
C)
Supply voltage Vdd (V)
AH1891
Document number: DS35207 Rev. 2 - 4
4 of 7
www.diodes.com
May 2016
© Diodes Incorporated
AH1891
Performance Characteristics
(1) U-WLB0808-4
NEW PRODUCT
OBSOLETE – PART DISCONTINUED
T
A
(C)
P
D
(mW)
25
166
50
132
60
120
70
105
80
93
85
86
90
79
100
66
110
53
120
39
130
26
140
13
150
0
P
D
(mW)
Power Dissipation Curve (AH1891-CSP)
200
150
100
50
0
-40
0
25
50
o
75 85
T
A
( C)
100
125
150
Ordering Information
AH1891 - CA4 - 7
Package
U-WLB0808-4
Device
(Note 3)
AH1891-CA4-7
Notes:
Packing
7 : Tape & Reel
7” Tape and Reel
Quantity
3,000/Tape & Reel
Part Number Suffix
-7
Package
Code
CA4
Packaging
(Note 4)
U-WLB0808-4
3. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
4. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AH1891
Document number: DS35207 Rev. 2 - 4
5 of 7
www.diodes.com
May 2016
© Diodes Incorporated
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