AH1891

PART OBSOLETE - USE AH1898 / AH1892
AH1891
MINIATURE MICROPOWER OMNIPOLAR
HALL EFFECT SWITCH
Description
Pin Assignments
PRODUCT
DISCONTINUED
OBSOLETE –NEW
PART
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.
(Top View)
A1
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).
B1
(Bottom View)
A2
A2
A1
B2
B1
B2
The AH1891 is available in U-WLB0808-4 package.
Features
Applications







Cellular Phones



Portable PCs and PDAs
Digital Cameras
Portable and Battery Powered Applications



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
Typical Application Circuit
Output 1
Vdd
AH1891
Output 2
GND
AH1891
Document number: DS35207 Rev. 2 - 4
1 of 7
www.diodes.com
May 2016
© Diodes Incorporated
AH1891
Pin #
Pin Name
Description
A1
Out 1
Output Pin ( active low )
A2
Out 2
Output Pin (active high)
B1
GND
Ground
B2
Vdd
Power Supply Voltage
Functional Block Diagram
Vdd
Hall
Plate
Power
switch
Offset
Cancelling
Latch
Amp
Out1
Output
Controller
Hall
Plate
Offset
Cancelling
PRODUCT
DISCONTINUED
OBSOLETE –NEW
PART
Pin Descriptions
Amp
GND
Vdd
Latch
Out2
GND
Absolute Maximum Ratings (TA = 25C)
Symbol
Vdd
B
Parameter
Supply voltage
Magnetic flux density
TA
Ts
Operating Temperature Range
Storage Temperature Range
PD
TJ
Package Power Dissipation
Maximum Junction Temperature
Values
Unit
5
V
Unlimited
-40 to +85
-65 to +150
C
C
166
150
mW
C
Recommended Operating Conditions (TA = 25C)
Symbol
Parameter
Conditions
Rating
Unit
Vdd
Supply Voltage
Operating
1.8 to 3.3
V
AH1891
Document number: DS35207 Rev. 2 - 4
2 of 7
www.diodes.com
May 2016
© Diodes Incorporated
AH1891
Electrical Characteristics (TA = +25°C, Vdd = 1.8V, unless otherwise specified)
PRODUCT
DISCONTINUED
OBSOLETE –NEW
PART
Symbol
Parameter
Conditions
Min
Typ.
Max
Unit
V
VOH
Output On Voltage (High side)
IO= -0.5mA
Vdd-0.2
-
-
VOL
Output On Voltage (Low side)
IO= 0.5mA
-
0.2
V
Ioff
Output Leakage Current
Output off
-
<0.1
1
µA
Chip enable
-
2
4
mA
Chip disable
-
5
8
µA
Idd(en)
Idd(dis)
Supply Current
Idd(avg)
Average supply current
-
7
12
µA
Tawake
Awake Time
-
-
50
100
µs
Tperiod
Period
-
-
50
100
ms
Duty Cycle
-
-
0.1
-
%
D.C.
Magnetic Characteristics (TA = 25C, 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
Min
Typ.
Max
20
40
60
-60
-40
-20
12
25
50
-50
-25
-12
-
15
-
Hysteresis
Unit
Gauss
1. Typical data is at TA = 25C, 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 vs. Temperature
Vdd = 3.3V
Switch points vs. Temperature
Vdd = 1.8V
60
60
Bops
Brps
Bopn
Brpn
Bhy_S
Bhy_N
20
0
-20
-40
40
Gauss (G)
Gauss (G)
40
Bops
Brps
Bopn
Brpn
Bhy_S
Bhy_N
20
0
-20
-40
-60
-60
-55 -40 -25 -10
5
20
35
50
65
80
95
-55 -40 -25 -10
5
20
35
50
65
80
95
o
o
Temperature ( C)
Temperature ( C)
Switch Points Bop and Brp vs. Supply Toltage
Switch points vs. Supply voltage
TA = 25oC
60
Gauss (G)
40
Bops
Brps
Bopn
Brpn
Bhys_S
Bhys_N
20
0
-20
-40
-60
1.5
1.8
2.1
2.4
2.7
3
3.3
Supply voltage Vdd (V)
Average Supply Current vs. Temperature
Average Supply Current vs. Supply Voltage
Average supply current vs. Supply voltage
TA = 25oC
Average supply current vs. Temperature
Vdd = 1.8V and 3.3V
35
30
25
1.8V
20
3.3V
15
10
5
0
-55 -40 -25 -10
5
20
35
Temperature (oC)
AH1891
Document number: DS35207 Rev. 2 - 4
50
65
80
95
Avg. Supply Current Idd (uA)
40
Avg. Supply Current Idd (uA)
PRODUCT
DISCONTINUED
OBSOLETE –NEW
PART
Switch Points Bop and Brp vs. Temperature
20
18
15
Idd(avg)
13
10
8
5
3
0
1.5
1.8
2.1
2.4
2.7
3
3.3
Supply voltage Vdd (V)
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AH1891
Performance Characteristics
PRODUCT
DISCONTINUED
OBSOLETE –NEW
PART
(1) U-WLB0808-4
TA (C)
25
50
60
70
80
85
90
100
110
120
130
140
150
PD (mW)
166
132
120
105
93
86
79
66
53
39
26
13
0
PD (mW)
Power Dissipation Curve (AH1891-CSP)
200
150
100
50
0
0-40
25
75 85
50
100
125
150
o
TA ( C)
Ordering Information
AH1891 - CA4 - 7
Package
Packing
U-WLB0808-4
7 : Tape & Reel
7” Tape and Reel
Device
(Note 3)
Package
Code
Packaging
(Note 4)
Quantity
Part Number Suffix
AH1891-CA4-7
CA4
U-WLB0808-4
3,000/Tape & Reel
-7
Notes:
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
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May 2016
© Diodes Incorporated
AH1891
Marking Information
(Top View)
A1
A2
XX : Identification Code
Y : Year : 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : A~Z : Internal Code
XX
YWX
B1
B2
Part Number
Package
Identification Code
AH1891-CA4-7
U-WLB0808-4
A2
Package Outline Dimensions (All Dimensions in mm)
0.15 A
(1) Package type: U-WLB0808-4
4x
0.80±0.040
CL 0.40Ref.
A
B
CL
Pin ID
0.80±0.040
0.40±0.020
CL
Hall sensor location
CL
-?
4x
0.0
0.40±0.020
0.40Ref.
1
±
72
0.1
0.08 C
0.40±0.020
CL
4- ? 0
.215 ± CL
0.01
0.05
MC
AB
AH1891
Document number: DS35207 Rev. 2 - 4
0.155±0.01
4x-
0.351±0.01
0.05 C
0.506Ref.
Top Mark
Land Pattern Recommendation
(unit:mm)
C
0.40±0.020
PRODUCT
DISCONTINUED
OBSOLETE –NEW
PART
(1) U-WLB0808-4
6 of 7
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May 2016
© Diodes Incorporated
AH1891
PRODUCT
DISCONTINUED
OBSOLETE –NEW
PART
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express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
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its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or
systems.
Copyright © 2015, Diodes Incorporated
www.diodes.com
AH1891
Document number: DS35207 Rev. 2 - 4
7 of 7
www.diodes.com
May 2016
© Diodes Incorporated
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