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AH1887
MICROPOWER, ULTRA-SENSITIVE HALL EFFECT SWITCH Description
AH1887 is with two Hall effect plates and dual CMOS output driver, mainly designed for battery-powered, hand-held equipment (such as Cellular and Cordless Phone, PDA). The total operation power is down to 15uW in the 1.8V supply. Either north or south pole of sufficient strength will turn the output on. The output will be turned off under no magnetic field. While the magnetic flux density (B) is larger than operate point Bop(s), the output1 will be turned on (low), the output is held until B is lower than release point Brp(s), then turned off (high). While the magnetic flux density (B) is larger than operate point Bop(n), the output2 will be turned on (low), the output is held until B is lower than release point Brp(n), then turned off (high).
Pin Assignments
( Top View ) Out 2 GND NC
1 2 3
SOT553
5 Out 1
4
Vdd
Features
* * * * Micropower operation Operation with North or South Pole 1.65V to 3.3V battery operation Chopper stabilized * Superior temperature stability * Extremely Low Switch-Point Drift * Insensitive to Physical Stress Good RF noise immunity -40C to 85C operating temperature ESD 4KV in human body mode Package: SOT553 "Green" Molding Compound
Applications
* * * Cellular phone PDA Cordless phone
* * * * *
Typical Application Circuit
Vdd
Output 1 AH1887 Output 2 GND
AH1887
Document number: DS31313 Rev. 4 - 2
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August 2010
(c) Diodes Incorporated
AH1887
MICROPOWER, ULTRA-SENSITIVE HALL EFFECT SWITCH Pin Descriptions
Pin Name Out 2 (Note 1) GND NC Vdd Out 1 (Note 1)
Notes:
P/I/O O P/I P/I O
Pin # 1 2 3 4 5
Description Output Pin ( active Low ) Ground No Connection Power Supply Voltage Output Pin ( active Low )
1. Output1 responds to South pole; Output2 responds to North pole.
Functional Block Diagram
Vdd
Power switch Offset Cancelling Offset Cancelling Hall Plate
Amp
Latch
Out1
Logical Hall Plate
GND Vdd
Amp
Latch
Out2 GND
Absolute Maximum Ratings (TA = 25C)
Symbol Vdd B TS PD TJ Characteristics Supply voltage Magnetic flux density Storage Temperature Range Package Power Dissipation Maximum Junction Temperature Values 5 Unlimited -65 to +150 230 150 Unit V C mW C
Recommended Operating Conditions (TA = 25C)
Symbol Vdd TA AH1887
Document number: DS31313 Rev. 4 - 2
Parameter Supply Voltage Operating Temperature Range
Conditions Operating Operating
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Rating 1.65 to 3.3 -40 to +85
Unit V C
August 2010
(c) Diodes Incorporated
AH1887
MICROPOWER, ULTRA-SENSITIVE HALL EFFECT SWITCH Electrical Characteristics (TA = 25C, Vdd = 1.8V, unless otherwise specified)
Symbol VOH VOL Idd(en) Idd(dis) Idd(avg) Tawake Tperiod D.C. 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 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 %
Magnetic Characteristics (TA = 25C, Vdd = 1.8V~3.0V, Note 2, 3, 4)
(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 -50 6 3
Typ. 35 -35 20 -20 15
Max 50 -6 -
Unit
Gauss
2. Typical data is at Ta = 25C, Vdd = 3V, and for design information only. 3. Bops & Brps for Output 1 responds to South pole; Bopn & Brpn for Output 2 responds to North pole. 4. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
Output2 ( Output Voltage ) ( Output Voltage )
Output1
Vdd ( off-state )
Turn on
( off-state )
Vdd
Bhy
Turn off
Turn off
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
AH1887
Document number: DS31313 Rev. 4 - 2
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August 2010
(c) Diodes Incorporated
AH1887
MICROPOWER, ULTRA-SENSITIVE HALL EFFECT SWITCH Typical Operating Characteristics
Switching Point
AH1887 Hysteresis vs. Temperature (Vdd=1.8V)
40 30 20 10
AH1887 Hysteresis vs. Vdd @ (TA=25 Degree C)
40 30
Bops BrpS Bopn
-50 -25 0 25 50 75 100
20 10
Gauss(G) 0
1.8 2.3 2.8 3.3
Bops Brps Bopn Brpn Bhys_s Bhys_n
Gauss(G)
0 -10 -20 -30 -40
Brpn Bhys_s Bhys_n
-10 -20 -30 -40
Temperature ( )
Vdd(V)
Supply Current
AH1887 Idd(avg.) vs. Temperature 12 10 8
Idd(avg.) unit: uA AH1887 Idd(avg.) vs. Vdd (TA=25 Degree C)
14 12 10 1.8V
Idd(avg.) unit: uA
8 6 4
6 4 2 0 -50 -25 0 25 50 75 100
2.5V
Idd(avg.) unit: uA
2 0 1.8 2.3
Vdd(V)
2.8
3.3
Temperature ()
AH1887
Document number: DS31313 Rev. 4 - 2
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August 2010
(c) Diodes Incorporated
AH1887
MICROPOWER, ULTRA-SENSITIVE HALL EFFECT SWITCH Performance Characteristics
TA (C) PD (mW) 25 230
P D (m W )
300
50 184
60 166
70 147
80 129
85 120
90 110
100 92
110 74
120 55
130 37
140 18
150 0
P o w e r D is s i p a tio n C u rv e
200
100
0 0 -4 0 25 50 75 85 100 12 5 150
o
TA ( C)
Ordering Information
AH 1887 - Z G - 7
Package Z : SOT553
Device AH1887-ZG-7
Notes:
Green
Packing 7 : Tape & Reel
G : Green
Package Code Z
Packaging (Note 5 & 6) SOT553
7" Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7
5. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 6. 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.
AH1887
Document number: DS31313 Rev. 4 - 2
5 of 7 www.diodes.com
August 2010
(c) Diodes Incorporated
AH1887
MICROPOWER, ULTRA-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
Identification Code KU
XX Y W X
Part Number AH1887
Package SOT553
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
AH1887
Document number: DS31313 Rev. 4 - 2
0.55/0.62
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1.7
2.2
C L
0.1
C L
August 2010
(c) Diodes Incorporated
AH1887
MICROPOWER, ULTRA-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
AH1887
Document number: DS31313 Rev. 4 - 2
7 of 7 www.diodes.com
August 2010
(c) Diodes Incorporated

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