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MICROPOWER, GENERAL-SENSITIVE HALL EFFECT
Description
The AH1888 micro power Omni-polar Hall Effect switch IC
designed for portable and battery powered equipment such
as cellular phones, PDA’ s and portable PC’ s. Based on
two sensitive Hall Effect plates and chopper stabilized
architecture the AH1888 provides a reliable solution over the
whole operating range. To support portable and battery
powered equipment the design has been optimized to
operate over the supply range of 1.65V to 3.3V and
consumes only 12.6µW with a supply of 1.8V.
The outputs are switched with either a north or south pole of
sufficient strength. When the magnetic flux density (B) is
larger than operate point (Bop) the output is switched on. The
output is turned off when B becomes lower than the release
point (Brp). The output will remain off when there is no
magnetic field. The AH1888-ZG has two outputs, output one
pulls low when switched on and output two is inverted. The
AH1888-FJG provides output one and AH1888-FJRG
provides output two.
Features
• Omni-polar (north or south pole) operation
• Single or dual output options
• Internal output pull up capability
• Micropower operation
• 1.65V to 3.3V operating range
• Chopper stabilized design provides
• Superior temperature stability
• Minimal switch point drift
• Enhanced immunity to stress
• Good RF noise immunity
• -40°C to 85°C operating temperature
• ESD (HBM)＞4KV for SOT553
• ESD (HBM)＞5KV for U-DFN2020-3 and U-DFN2020R-3
• Package: SOT553, U-DFN2020-3 and U-DFN2020R-3
• Halogen and Antimony free “Green” device
AH1888
Document number: DS31565 Rev. 8 - 2
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AH1888
Pin Assignments
( Top View )
5
43
(Top View)
3. GND
U-DFN2020R-3
© Diodes Incorporated
GND
NC
1
2
SOT553
2. Output 11. Vdd
Output 2
(Top View)
3. GND
U-DFN2020-3
Applications
• Cellular phone
• Portable PC and PDAs
• Camcorders
• Cordless phone
• Contactless switch in consumer products
SWITCH
Output1
Vdd
2. Output 21. Vdd
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AH1888
Typical Application Circuit
(1) SOT553 (2) U-DFN2020-3 (3) U-DFN2020R-3
Vdd
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT
SWITCH
Vdd
Vdd
Output 1
AH1888
GND
Output 2
AH1888
Pin Descriptions
Pin Name P/I/O Description
Vdd P/I Power Supply Voltage
GND P/I Ground
Output 1 O Output Pin ( Active Low )
Output 2 O Output Pin ( Active High )
AH1888
Document number: DS31565 Rev. 8 - 2
Output 1
GND
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AH1888
GND
Output 2
February 2012
© Diodes Incorporated
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Functional Block Diagram
(1) SOT553
Hall
Plate
Cancellation
Offset
AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT
SWITCH
Vdd
Sleep/Awake Logic
and Power Switch
Amp
Latch
Output 1
(2) U-DFN2020-3
(3) U-DFN2020R-3
Hall
Plate
Hall
Plate
Hall
Plate
Cancellation
Cancellation
Offset
Offset
Cancellation
Offset
Amp
Amp
Amp
Latch
Vdd
Sleep/Awake Logic
and Power Switch
Latch
Latch
Vdd
Output
Controller
Output
Driver
Controller
Driver
GND
Vdd
Output 2
GND
Output 1
GND
Hall
Plate
Hall
Plate
AH1888
Document number: DS31565 Rev. 8 - 2
Cancellation
Cancellation
Offset
Offset
Amp
Amp
Sleep/Awake Logic
and Power Switch
Latch
Latch
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Output
Driver
Controller
Output 2
GND
February 2012
© Diodes Incorporated
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AH1888
Absolute Maximum Ratings (T
Symbol Characteristics Values Unit
Vdd Supply voltage 5 V
B Magnetic flux density Unlimited
TS
PD
TJ
Recommended Operating Conditions (T
Symbol Characteristic Conditions Rating Unit
Vdd Supply Voltage Operating 1.65 to 3.3 V
TA
Electrical Characteristics (T
Symbol Characteristic Conditions Min Typ. Max Unit
VOH
VOL
Idd(en)
Idd(dis) Chip disable - 5 8 µA
Idd(avg) Average supply current - 7 12 µA
Tawake Awake Time (Note 1) - 50 100 µs
Tperiod Period (Note 1) - 50 100 ms
D.C. Duty Cycle - 0.1 - %
Notes: 1. When power is initially turned on, Vdd must be within its correct operating range (1.65V to 3.3V) to guarantee the output sampling. The output state is
valid after the second operating cycle (typical 100ms).
AH1888
Document number: DS31565 Rev. 8 - 2
Storage Temperature Range -65 to +150 °C
Package Power Dissipation 230 mW
Maximum Junction Temperature 150 °C
Operating Temperature Range Operating -40 to +85 °C
= 25°C, Vdd = 1.8V, unless otherwise specified)
A
Output On Voltage (High side)
Output On Voltage (Low side)
Supply Current
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT
= 25°C)
A
= 25°C)
A
IO = -0.5mA
IO = 0.5mA
Chip enable - 2 4 mA
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Vdd - 0.2 - - V
- - 0.2 V
© Diodes Incorporated
SWITCH
February 2012
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Magnetic Characteristics (T
Symbol Characteristic Min Typ. Max Unit
Bops(south pole to brand side)
Bopn(north pole to brand side) -79 -61 Brps(south pole to brand side)
Brpn(north pole to brand side) - -53 -35
Bhy( BrpxBopx − )
Notes: 2. Typical data is at Vdd = 3V.
3. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
= 25°C, Vdd = 1.8V ~ 3.0V, Note 2 & 3)
A
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT
Operate Point
Release Point
Hysteresis 3 8 -
- 61 79
35 53 -
Output 1 ( Active Low )
Output 1 ( Active Low )
AH1888
SWITCH
(1mT=10 Gauss)
Gauss
( off-state )
dd
V
Turn on
hy
B
Turn off
( Output Voltage )
( on-state )
B
opn
rpn
B
sat
V
0
Turn off
( Output Voltage )
sat
V
NNS
( Magnetic flux density B )
Output 2 ( Active High )
( off-state )
dd
V
Turn on
hy
B
Turn off
( Output Voltage )
Output 2 ( Active High )
Turn off
( Output Voltage )
( off-state )
0
hy
B
rps
B
V
ops
B
dd
Turn on
( on-state )
( Magnetic flux density B )
( off-state )
hy
B
dd
V
Turn on
S
( on-state )
opn
B
( Magnetic flux density B )
AH1888
Document number: DS31565 Rev. 8 - 2
ops
B
( on-state )
S
sat
V
rpn
B
0
sat
V
rps
B
NNS
0
( Magnetic flux density B )
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Page 6
T
C
H P
OIN
T (G
TCH P
OINT (G
P
Typical Characteristics
80
60
AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT
SWITCH
80
Bops
60
Bops
40
auss)
20
0
-20
-40
SWI
-60
-80
-50 -25 0 25 50 75 100
Brps
Brpn
Bopn
TEMPERATURE (°C)
Switch Points vs. Temperature
V = 2.8V
DD
Performance Characteristics
For SOT553, U-DFN2020-3 and U-DFN3030R-3
TA (°C)
PD (mW)
25 50 60 70 80 85 90 100 110 120 130 140 150
230 184 166 147 129 120 110 92 74 55 37 18 0
300
40
auss)
20
0
-20
-40
SWI
-60
-80
1.5 2.0 2.5 3.0 3.2
Brps
Brpn
V (V)
Switch Points vs. Temperature
DD
T = 25°C
A
Bopn
200
(W)
D
100
0
025507585100 125 150
T = 25°C
A
Power Dissipation
AH1888
Document number: DS31565 Rev. 8 - 2
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g
Ordering Information
AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT
SWITCH
AH 1888 -XXX G -7
Package
Green
Z : SOT553 G : Green
FJ :
U-DFN2020-3
FJR :
U-DFN2020R-3
Device
AH1888-ZG-7 Z SOT553 3000/Tape & Reel -7
AH1888-FJG-7 FJ U-DFN2020-3 3000/Tape & Reel -7
AH1888-FJRG-7 FJR U-DFN2020R-3 3000/Tape & Reel -7
Notes: 4. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. No purposely added lead. Halogen and Antimony free. Please visit our
website at http://www.diodes.com/products/lead_free.html.
5. 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.
Package
Code
Packaging
(Note 4 & 5)
Quantity Part Number Suffix
Packin
7 : T ape & Reel
7” Tape and Reel
AH1888
Document number: DS31565 Rev. 8 - 2
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February 2012
© Diodes Incorporated
Page 8
Marking Information
(1) SOT553
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT
( Top View )
: Identification Code
XX
Y : Year : 0~9
W
XX Y W X
: Week : A~Z : 1~26 week;
a~z : 27~52 week;
z represents 52 and 53 week
: A~Z : Green
X
Part Number Package Identification Code
AH1888 SOT553 KV
AH1888
SWITCH
(2) U-DFN2020-3 and U-DFN2020R-3
( Top View )
XX
Y
WX
Part Number Package Identification Code
AH1888 U-DFN2020-3 KV
AH1888 U-DFN2020R-3 KW
AH1888
Document number: DS31565 Rev. 8 - 2
Pin 1 indicator
: Identifica tio n Code
XX
Y : Ye a r : 0~ 9
: Week : A~Z : 1 ~26 wee k ;
W
a~z : 27~52 week;
z represents 52 and 53 week
: A~Z : G re e n
X
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© Diodes Incorporated
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MICROPOWER, GENERAL-SENSITIVE HALL EFFECT
Package Outline Dimensions (All Dimensions in mm)
(1) Package Type: SOT553
D
0.30 C
D
1.50/1.70
1.0Typ.
CL
A
0.30 C D
0.10/0.18
0.3 0.07
±
°
6
°
8
~
AH1888
SWITCH
1.0Typ.
CL
5x-0.5
0.45/0.67
CL
0.32/0.58
1.10/1.25
1.55/1.70
Pin1
0.30 C
°
6
°
~
8
6
°
~
8
°
0.5Typ.
Hall Sensor
0.15/0.30(5x)
B
0.10M C A-B D
0.55/0.62
0.1
(2) Package Type: U-DFN2020-3 and U-DFN2020R-3
1.03
0.74
0.10 C
0.08 C
CL
Top View
0.57/0.63
0/0.05
B
Pin1
R
0
.
2
CL
1.95/2. 075
0.8/1.0
Sensor location
CL
0.152 T yp0.138 Ref
1
CL
0.3 5/0.45
Die
CL
Seating plane
C
DIE
CL
1.2
1.7
2.2
Pin1
0.5Typ.
0.3
Top View
Land Pattern Recommendation
(Unit:mm)
=Package Center Location Li ne
CL
0.322
5
2
2
.
0
R
1.1
2.3
0.6 0.4 0.45
0.15
0.35
1.4
0.450.48
CL
0.689 0.45
2
.
0
R
Pin1
1
Top View
Land Pattern Recommendation
(Unit:mm)
= Package Center location Line
CL
2x-
AH1888
Document number: DS31565 Rev. 8 - 2
0.25
B
0.10 M C A B
0.2/0.3
1.1/1.3 0.325Ref.
1.95/2.075
Bottom View
0.25 A
2x
0.18 0.07
A
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±
February 2012
© Diodes Incorporated
Page 10
Taping Orientation (Note 6)
For U-DFN2020-3 and U-DFN2020R-3
AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT
SWITCH
Notes: 6. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf.
AH1888
Document number: DS31565 Rev. 8 - 2
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© Diodes Incorporated
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AH1888
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS
DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other
changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability
arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any
license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described
herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies
whose products are represented on Diodes Incorporated website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized
sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall
indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names
and markings noted herein may also be covered by one or more United States, international or foreign trademarks.
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without
the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided
in the labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support devic e or system whose failure to perform can be reasonably expected
to cause the failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or
systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements
concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems,
notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further,
Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes
Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2012, Diodes Incorporated
www.diodes.com
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT
IMPORTANT NOTICE
LIFE SUPPORT
SWITCH
AH1888
Document number: DS31565 Rev. 8 - 2
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February 2012
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