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
NEW PRODUCT
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
• Halogen and Antimony Free. “Green” Device (Note 3)
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.
AH1892
Document number: DS35092 Rev. 1 - 2
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.
www.diodes.com
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: 5. Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings
NEW PRODUCT
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 V
operate the device at the absolute maximum rated conditions for any period of time.
Supply Voltage (Note 6) 6 V
Reverse Supply Voltage -0.3 V
Output current (source and sink) 2.5 mA
Package Power Dissipation
Maximum Junction Temperature 150 °C
of 6V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to
DD
Recommended Operating Conditions
Symbol Characteristics Conditions Rating Unit
VDD
TA
Supply Voltage Operating 1.6 to 3.6 V
Operating Temperature Range Operating -40 to +85 °C
Electrical Characteristics (T
Symbol Characteristics Conditions Min Typ Max Unit
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.
The output state is valid after the second operating phase (typical 100ms).
AH1892
Document number: DS35092 Rev. 1 - 2
Output low voltage (on)
Output high voltage (off)
BSEL pin internal pull-up resistor (Note 7) 50 kΩ
Supply current
Average cupply current
8. When power is initially on, the operating V
9. Transition time varies dependant on the timing of BSEL activation during the sleep and awake phases.
= +25°C, Note 5)
A
= +25°C, V
A
(1.6V to 3.6V) must be applied to guarantee the output sampling.
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.
BopsLB(south pole to brand side)
BopnLB (north pole to brand side)
BrpsLB (south pole to brand side)
BrpnLB (north pole to brand side)
BopsHB(south pole to brand side)
BopnHB (north pole to brand side)
BrpsHB (south pole to brand side)
BrpnHB (north pole to brand side)
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).
PROGRAMMABLE MICROPOWER OMNIPOLAR
HALL-EFFECT SENSOR SWITCH
NEW PRODUCT
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 int o 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 microcontroller 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.
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.
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, improvem ents, 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 produc t 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 uni ntended 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 critic al 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 regulat ory 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 ari sing out of the use of Diodes
Incorporated products in such safety-critical, life support devices or systems.