AH1892 Datasheet by Diodes Incorporated

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AH1892
PROGRAMMABLE MICROPOWER OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
AH1892
Document number: DS35092 Rev. 1 - 2 1 of 11
www.diodes.com May 2012
© Diodes Incorporated
NEW PRODUCT
Description
The AH1892 is a micropower magnetic range selectable (Bop/Brp)
Omnipolar Hall effect switch IC with internal pull up and pull down
capability, designed for consumer equipment ranging from portable
and battery powered cellular phones and portable PCs to home
appliances and industrial applications. To support battery powered
equipment and low voltage microcontrollers, the AH1892 can operate
over the supply range of 1.6V to 3.6V and uses a hibernating clocking
system to minimize the power consumption. The average supply
current is only 4.3µA typical at 1.80V. Due to the application diversity,
the AH1892 has an 8kV ESD rating on the supply and output pins. To
minimize PCB space the AH1892 is packaged in the small CSP
package (0.71mm x 0.71mm) or SOT553 leaded package
The output is activated with either a north or south pole of sufficient
magnetic field strength. The user can select one of two magnetic
sensitivity bands via the BSEL pin without the addition of any external
components allowing a flexible but small solution. The band select
can be hardwired or be changed on the fly via a logic source such as
a micro-controller. When the magnetic flux density (B) is larger than
operate point (Bop), the output will be turned on (pulled low) and held
until B is lower than release point (Brp).
Features
Omnipolar operation (North or South pole)
Programmable operate and release points
Supply voltage of 1.6V to 3.6V
• Micropower operation
Chopper stabilized design
Superior temperature stability
Extremely Low Switch-Point Drift
Insensitive to Physical Stress
No external pull up resistors required
Good RF noise immunity
• -40°C to +85°C operating temperature
8kV ESD on supply and output pins
Miniature U-WLB07070-4 (CSP 0.71mm x 0.71mm typical) and
small low profile SOT553
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
U-WLB0707-4
SOT553
Applications
Open and close detect for gaming and cellular phones
Holster and dock detect for cellular phones
Cover switch in portable and tablet PCs
Digital still and video cameras
Tray, door and covers position detect for printers and scanners
Contact-less switch in consumer and industrial products
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
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AH1892
PROGRAMMABLE MICROPOWER OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
AH1892
Document number: DS35092 Rev. 1 - 2 2 of 11
www.diodes.com May 2012
© Diodes Incorporated
NEW PRODUCT
Typical Application Circuit
Note : CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical
Pin Descriptions
Package: U-WLB0707-4
Pin # Pin Name Description
A1 GND Ground
A2 OUTPUT Output
B1 BSEL Band Select
B2 VDD Power Supply Voltage
Package: SOT553
Pin # Pin Name Description
1 VDD Power Supply Voltage
2 NC No Connection (Note 4)
3 BSEL Band Select
4 GND Ground
5 OUTPUT Output
Notes: 4. NC is “No Connection” pin and is not connected internally. This pin can be left open or connected to ground.
Functional Block Diagram
ms In
AH1892
PROGRAMMABLE MICROPOWER OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
AH1892
Document number: DS35092 Rev. 1 - 2 3 of 11
www.diodes.com May 2012
© Diodes Incorporated
NEW PRODUCT
Absolute Maximum Ratings (TA = +25°C, Note 5)
S
y
mbol Characteristics
V
alues Unit
VDD Supply Voltage (Note 6) 6 V
VDD REV Reverse Supply Voltage -0.3 V
IOUTPUT Output current (source and sink) 2.5 mA
B Magnetic Flux Density Unlimited
Ts Storage Temperature Range -65 to +150 °C
PD Package Power Dissipation U-WLB0707-4 160 mW
SOT553 230 mW
TJ Maximum Junction Temperature 150 °C
ESD Human Body Model ESD VDD, GND and OUT pins 8 kV
BSEL pin 6 kV
Notes: 5. Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings
only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device
reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time
6. The absolute maximum VDD of 6V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to
operate the device at the absolute maximum rated conditions for any period of time.
Recommended Operating Conditions
Symbol Characteristics Conditions Rating Unit
VDD Supply Voltage Operating 1.6 to 3.6 V
TA Operating Temperature Range Operating -40 to +85 °C
Electrical Characteristics (TA = +25°C, VDD = 1.8V, unless otherwise specified.)
Symbol Characteristics Conditions Min Typ Max Unit
VOL Output low voltage (on) IOUT = 1mA 0.1 0.2 V
VOH Output high voltage (off) IOUT = -1mA VDD -0.2 VDD -0.1 V
BLsel Band select low band 0 0.5 V
BHsel Band select high band 1.4 3.6 V
RU_BSEL BSEL pin internal pull-up resistor (Note 7) 50 k
IDD(awake) Supply current During ‘awake’ period 2.1 mA
IDD(sleep) During ‘sleep’ period 2.5 µA
IDD(avg) Average cupply current VDD = 1.8V 4.3 8.0 µA
IDD(avg) VDD = 3.6V 7.2 13.0 µA
Tawake Awake active pulse width (Note 8) 50 100 µs
Tperiod Awake period (Note 8) 50 100 ms
D.C. Duty cycle 0.1 %
TBand Band transition time ( Note 9) 100.0 200.1 ms
Notes: 7. BSEL pin internal pull-up resistor is only active during AWAKE time.
8. When power is initially on, the operating VDD (1.6V to 3.6V) must be applied to guarantee the output sampling.
The output state is valid after the second operating phase (typical 100ms).
9. Transition time varies dependant on the timing of BSEL activation during the sleep and awake phases.
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AH1892
PROGRAMMABLE MICROPOWER OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
AH1892
Document number: DS35092 Rev. 1 - 2 4 of 11
www.diodes.com May 2012
© Diodes Incorporated
NEW PRODUCT
Electrical Characteristics (cont.)
IDD(sleep)
IDD(awake)
Tawake
Tperiod
0
Sample and output
latched
Tsleep
Magnetic Characteristics (TA = +25°C, VDD = 1.6V to 3.6V, Note 10)
(1mT=10 Gauss)
BSEL Symbol Characteristics Min Typ Max Unit
Low BopsLB(south pole to brand side) Low Band - Operation Point 18 35 55
Gauss
Low BopnLB (north pole to brand side) -55 -35 -18
Low BrpsLB (south pole to brand side) Low Band - Release Point 12 25 45
Low BrpnLB (north pole to brand side) -45 -25 -12
High BopsHB(south pole to brand side) High Band - Operation Point 43 60 80
High BopnHB (north pole to brand side) -80 -60 -43
High BrpsHB (south pole to brand side) High Band - Release Point 35 50 70
High BrpnHB (north pole to brand side) -70 -50 -35
- Bhy (|Bopx|-|Brpx|) Hysteresis - 10 -
Notes: 10. Magnetic characteristics may vary with operating temperature and after soldering.
The AH1892 includes a band select pin (BSEL) so that the operate (Bops and Bopn) and release (Brps and Brpn) points can be adjusted
between two pre-defined ranges. The BSEL can be hard wired within the application circuit or the band can be selected on the fly by using
the BSEL pin as a logic input. This feature allows the AH1892 sensitivity to be changed by firmware within the application without the addition
of any external components. If the BSEL pin is left open circuit the AH1892 defaults to high band.
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AH1892
PROGRAMMABLE MICROPOWER OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
AH1892
Document number: DS35092 Rev. 1 - 2 5 of 11
www.diodes.com May 2012
© Diodes Incorporated
NEW PRODUCT
Application Note
Applications Circuit One – Low Band
Connecting the BSEL pin to ground permanently configures the AH1892 into its high sensitivity mode, requiring a reduced magnetic flux
density to activate its output (Low Band).
Applications Circuit Two – High Band
Connecting the BSEL pin to Vdd or to a voltage greater than 1.4V or leaving the BSEL pin unconnected configures the AH1892 into its low
sensitivity mode, requiring a higher magnetic flux density to activate its output (High Band).
Applications Circuit Three – Adjustable Sensitivity
To enhance flexibility within the application, the sensitivity can be adjusted with a standard logic signal allowing it to be controlled by a micro-
controller or a logic source. This allows the sensitivity to be changed within the application without a hardware change. Whenever the
sensitivity band selection is changed, the band selection changeover should be allowed to complete for the output to be valid.
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AH1892
PROGRAMMABLE MICROPOWER OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
AH1892
Document number: DS35092 Rev. 1 - 2 6 of 11
www.diodes.com May 2012
© Diodes Incorporated
NEW PRODUCT
Application Note (cont.)
Bands Select Change Timing and Valid Output
Whenever band selection BSEL pin input is changed, allow for band selection changeover to complete and stabilize. The output is valid only
after the second complete operating ‘awake’ phase. Time taken for the output to be valid, after the BSEL change, depends on timing of
BSEL change during the sleep and awake phase; this time can range from 100ms typical and 200.1ms maximum.
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AH1892
PROGRAMMABLE MICROPOWER OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
AH1892
Document number: DS35092 Rev. 1 - 2 7 of 11
www.diodes.com May 2012
© Diodes Incorporated
NEW PRODUCT
Typical Operating Characteristics
Typical switch points characterisitics in low band (BSEL = Low) and high band (BSEL = High)
Average Supply Current IDD(avg)
-50-250 255075100
TEMPERATURE (°C)
Switch Points vs. Temperature
70
50
40
10
0
-10
-20
-30
-40
-50
-70
G
A
USS (G)
-60
20
30
60
Bops Brps
Bhys
Brpn
Bopn
V = 1.80V, BSEL = Low (GND)
DD
-50-250 255075100
TEMPERATURE (°C)
Switch Points vs. Temperature
70
50
40
10
0
-10
-20
-30
-40
-50
-70
G
A
U
SS (
G
)
-60
20
30
60
Bops
Brps
Bhys
Brpn
Bopn
V = 1.80V, BSEL = High (V )
DD DD
1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6
SUPPLY VOLTAGE (V)
Switch Points vs. Supply Voltage
70
50
40
10
0
-10
-20
-30
-40
-50
-70
G
A
U
SS (
G
)
-60
20
30
60
1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6
SUPPLY VOLTAGE (V)
Switch Points vs. Supply Voltage
70
50
40
10
0
-10
-20
-30
-40
-50
-70
G
A
U
SS (
G
)
-60
20
30
60
Bops
Brps
Bhys
Brpn Bopn
T = +25°C,
BSEL = High (V )
A
DD
-50 -25 0 25 50 75 100
TEMPERATURE (°C)
Average Supply Current vs. Temperature
10
9
8
7
6
5
4
3
2
1
0
AVE
R
A
G
E S
U
P
P
L
Y
C
U
R
R
E
N
T
, I (avg)d (µA)
DD
V = 1.8V and 3.6V
DD
3.6V
1.8V
1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6
SUPPLY VOLTAGE (V)
Average Supply Current vs. Supply Voltage
10
9
8
7
6
5
4
3
2
1
0
AVE
R
A
G
E S
U
P
P
L
Y
C
U
R
R
E
N
T
, I (avg) (µA)
DD
T = +25°C
A
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AH1892
PROGRAMMABLE MICROPOWER OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
AH1892
Document number: DS35092 Rev. 1 - 2 8 of 11
www.diodes.com May 2012
© Diodes Incorporated
NEW PRODUCT
Ordering Information
Device Package Code Packaging
(Note 11)
7” Tape and Reel
Quantity Part Number Suffix
AH1892-CD4-7 CD4 U-WLB0707-4 3000/Tape & Reel -7
AH1892-Z-7 Z SOT553 3000/Tape & Reel -7
Notes: 11. 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.
Marking Information
(1) Package type: U-WLB0707-4
Part Number Package Identification Code
AH1892-CD4-7 U-WLB0707-4 B2
(2) Package type: SOT553
Part Number Package Identification Code
AH1892-Z-7 SOT553 B2
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AH1892
PROGRAMMABLE MICROPOWER OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
AH1892
Document number: DS35092 Rev. 1 - 2 9 of 11
www.diodes.com May 2012
© Diodes Incorporated
NEW PRODUCT
Package Outline Dimensions (All Dimensions in mm)
(1) Package type: U-WLB0707-4
nnnnnnnnnnnn
AH1892
PROGRAMMABLE MICROPOWER OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
AH1892
Document number: DS35092 Rev. 1 - 2 10 of 11
www.diodes.com May 2012
© Diodes Incorporated
NEW PRODUCT
Package Outline Dimensions (cont.)
(2) Package type: SOT553
1.0Typ.
0.15/0.30(5x)
0.30 C
0.10 M C A-B D
B
1.10/1.25
C
L
C
L
1.55/1.70
D
0.30 C
D
6°~8°
0.10/0.18
0.55/0.62
1.50/1.70
0.30 C D
A
6°~8°
6°~8°
Top View
1.2 5x-0.5
Land Pattern Recommendation
(Unit:mm)
1.0Typ.
1.7
2.2
Pin1 Pin1
0.1
C
L
C
L
0.5Typ.
0.5Typ. 0.3
0.45/0.67
Hall Sensor
Die
0.30±0.08
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AH1892
PROGRAMMABLE MICROPOWER OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
AH1892
Document number: DS35092 Rev. 1 - 2 11 of 11
www.diodes.com May 2012
© Diodes Incorporated
NEW PRODUCT
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 © 2012, Diodes Incorporated
www.diodes.com

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