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AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT SWITCH 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 12.6uW 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.
Pin Assignments
( Top View )
Output 2 GND NC
1 2 3 SOT553
5
Output1
4
Vdd
( Top View )
3. GND
( Top View )
3. GND
1. Vdd
2. Output 1
1. Vdd
2. Output 2
DFN2020-3
DFN2020R-3
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 -40C to 85C operating temperature ESD (HBM)4KV for SOT553 ESD (HBM)5KV for DFN2020-3 and DFN2020R-3 Package: SOT553, DFN2020-3 and DFN2020R-3 "Green" Molding Compound
Applications
* * * Cellular phone PDA Cordless phone
AH1888
Document number: DS31565 Rev. 6 - 2
1 of 11 www.diodes.com
August 2010
(c) Diodes Incorporated
AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT SWITCH Typical Application Circuit
(1) SOT553 (2) DFN2020-3 (3) DFN2020R-3
Vdd
Vdd
Vdd
Output 1 AH1888 Output 2 GND GND AH1888
Output 1
AH1888 GND
Output 2
Pin Descriptions
Pin Name Vdd GND Output 1 Output 2 P/I/O P/I P/I O O Ground Output Pin ( Active Low ) Output Pin ( Active High ) Description Power Supply Voltage
AH1888
Document number: DS31565 Rev. 6 - 2
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(c) Diodes Incorporated
AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT SWITCH Functional Block Diagram
(1) SOT553
Vdd
Power switch Hall Plate Offset Cancelling
Amp
Latch
Output 1
Logical Hall Plate Offset Cancelling
GND Vdd
Amp
Latch
Output 2 GND
(2) DFN2020-3
Vdd
Power switch Hall Plate Offset Cancelling
Amp
Latch
Logical Hall Plate Offset Cancelling
Output 1
Amp
Latch
GND
(3) DFN2020R-3
Vdd
Power switch Hall Plate Offset Cancelling
Amp
Latch
Logical Hall Plate Offset Cancelling
Output 2
Amp
Latch
GND
AH1888
Document number: DS31565 Rev. 6 - 2
3 of 11 www.diodes.com
August 2010
(c) Diodes Incorporated
AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT SWITCH Absolute Maximum Ratings (TA = 25C)
Symbol Vdd B Ts PD TJ Supply voltage Magnetic flux density Storage Temperature Range Package Power Dissipation Maximum Junction Temperature Characteristics Values 5 Unlimited -65 to +150 230 150 Unit V C mW C
Recommended Operating Conditions (TA = 25C)
Symbol Vdd TA Characteristic Supply Voltage Operating Temperature Range Conditions Operating Operating Rating 1.65 to 3.3 -40 to +85 Unit V C
Electrical Characteristics (TA = 25C, Vdd = 1.8V, unless otherwise specified)
Symbol VOH VOL Idd(en) Idd(dis) Idd(avg) Tawake Tperiod D.C.
Notes:
Characteristic Output On Voltage (High side) Output On Voltage (Low side) Supply Current Awake Time Period Duty Cycle
Conditions IO= -0.5mA IO= 0.5mA Chip enable Chip disable Average supply current (Note 1) (Note 1)
Min Vdd-0.2 -
Typ. 2 5 7 50 50 0.1
Max 0.2 4 8 12 100 100 -
Unit V V mA uA uA s ms %
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. 6 - 2
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August 2010
(c) Diodes Incorporated
AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT SWITCH Magnetic Characteristics (TA = 25C, Vdd = 1.8V~3.0V, Note 2 & 3)
(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:
Characteristic Operate Point Release Point Hysteresis
Min -79 35 3
Typ. 61 -61 53 -53 8
Max 79 -35 -
Unit
Gauss
2. Typical data is at Vdd = 3V. 3. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
Output 1 ( Active Low ) ( Output Voltage ) ( Output Voltage )
Output 1 ( Active Low )
Vdd
Turn on
( off-state ) Turn off
( off-state ) Turn off
Vdd
Bhy
Bhy
Turn on
( on-state )
Vsat S N
Vsat
( on-state )
N
Bopn Brpn 0 ( Magnetic flux density B )
0 Brps Bops ( Magnetic flux density B )
S
Output 2 ( Active High ) ( Output Voltage ) ( Output Voltage )
Output 2 ( Active High )
Vdd
( off-state ) Turn off
( off-state ) Turn off
Vdd
Turn on
Bhy
Bhy
Turn on
( on-state )
Vsat S N
Vsat
( on-state )
N
Bopn Brpn 0 ( Magnetic flux density B )
0 Brps Bops ( Magnetic flux density B )
S
AH1888
Document number: DS31565 Rev. 6 - 2
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August 2010
(c) Diodes Incorporated
AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT SWITCH Typical Characteristics
Sw itch points vs Tem perature Vdd = 2.8V
80 60 Bops
80 60
Sw itch Points vs Supply Voltage TA = 25
Bops
Switch Point (Gauss)
Switch Point (Gauss)
40 20 0 -20 -40 -60 -80 -50
Brps
40 20 0 -20 -40 -60 -80
Brps
Brpn Bopn -25 0 25 50 75 100
Brpn Bopn 2.0 2.5 3.0 3.5
1.5
Tem perature ( )
Vdd (V)
Performance Characteristics
For SOT553, DFN2020-3 and DFN3030R-3
TA (C) 25 50 60 70 80 85 90 100 110 120 130 140 150
PD (mW)
230
184
166
147
129
120
110
92
74
55
37
18
0
P D (m W )
300
P o w e r D is s i p a tio n C u rv e
200
100
0 -4 0 0 25 50 75 85 100 12 5 150
o
TA ( C)
AH1888
Document number: DS31565 Rev. 6 - 2
6 of 11 www.diodes.com
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(c) Diodes Incorporated
AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT SWITCH Ordering Information
AH 1888 - XXX G - 7
Package Z : SOT553 FJ : DFN2020-3 FJR : DFN2020R-3
Device Package Code Z FJ FJR Packaging (Note 4 & 5) SOT553 DFN2020-3 DFN2020R-3
Green
Packing 7 : Tape & Reel
G : Green
AH1888-ZG-7 AH1888-FJG-7 AH1888-FJRG-7
Notes:
7" Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 3000/Tape & Reel -7 3000/Tape & Reel -7
4. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. 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.
AH1888
Document number: DS31565 Rev. 6 - 2
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(c) Diodes Incorporated
AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT SWITCH Marking Information
(1) SOT553
( Top View )
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 : Green
XX Y W X
Part Number AH1888
Package SOT553
Identification Code KV
(2) DFN2020-3 and DFN2020R-3
( Top View ) XX YWX Pin 1 indicator 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 : Green
Package DFN2020-3 DFN2020R-3 Identification Code KV KW
Part Number AH1888 AH1888
AH1888
Document number: DS31565 Rev. 6 - 2
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AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT SWITCH Package Outline Dimensions (All Dimensions in mm)
(1) Package Type: SOT553
1.50/1.70
0.30 C D 0.30 C D
1.0Typ.
C L
A
1.0Typ. 5x-0.5 0.10/0.18
6~8
C L
D
0.45/0.67
1.55/1.70
1.10/1.25
0.32/0.58
Hall Sensor
0.30 C
Pin1 0.5Typ.
6~8
1.2
0.15/0.30(5x)
B
0.10 M C A-B D
Pin1 0.5Typ. 0.3 Land Pattern Recommendation (Unit:mm) Top View
6~ 8
(2) Package Type: DFN2020-3 and DFN2020R-3
1.03 0.3 0.74
C L
0.55/0.62
1.25
0.325
Pin3
0.47/0.53
2.4
Top View
0/0.05
0.925
Sensor location
C L
0.65
0.10 C 0.08 C
Seating plane
B
Pin1
0.5 Pin2 1
0.5Typ
R0
Pin1
C L
C
.2
Pin2
1.85/2.15
0.775/0.975
C L
0.35/0.45
Land Pattern Recommendation Unit:mm Top View
DIE
2x-
0.25 B
Pin3
0.138
0.2/0.3 0.10 M C A B 1.1/1.35 1.85/2.15
0.25 A
0.180.07 0.325
A
Bottom View
2x
AH1888
Document number: DS31565 Rev. 6 - 2
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0.138
0.3
1.7
2.2
C L
0.1
C L
August 2010
(c) Diodes Incorporated
AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT SWITCH Taping Orientation (Note 6)
For DFN2020-3 and DFN2020R-3
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. 6 - 2
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(c) Diodes Incorporated
AH1888
MICROPOWER, GENERAL-SENSITIVE HALL EFFECT SWITCH
IMPORTANT NOTICE 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. LIFE SUPPORT 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 device 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 (c) 2010, Diodes Incorporated www.diodes.com
AH1888
Document number: DS31565 Rev. 6 - 2
11 of 11 www.diodes.com
August 2010
(c) Diodes Incorporated

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