AH1892 PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR SWITCH Description Pin Assignments 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 NEW PRODUCT 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 U-WLB0707-4 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). SOT553 Features • Omnipolar operation (North or South pole) • Programmable operate and release points • Supply voltage of 1.6V to 3.6V • Micropower operation • Applications 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) Notes: • 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 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. AH1892 Document number: DS35092 Rev. 1 - 2 1 of 11 www.diodes.com May 2012 © Diodes Incorporated AH1892 PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR SWITCH 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 A1 GND Ground Description A2 OUTPUT Output B1 BSEL B2 VDD Band Select Power Supply Voltage Package: SOT553 Pin # Pin Name 1 VDD Power Supply Voltage 2 NC No Connection (Note 4) 3 BSEL Band Select 4 GND Ground OUTPUT Output 5 Notes: Description 4. NC is “No Connection” pin and is not connected internally. This pin can be left open or connected to ground. Functional Block Diagram AH1892 Document number: DS35092 Rev. 1 - 2 2 of 11 www.diodes.com May 2012 © Diodes Incorporated AH1892 PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR SWITCH Absolute Maximum Ratings (TA = +25°C, Note 5) Symbol Values Unit VDD Supply Voltage (Note 6) 6 V VDD REV Reverse Supply Voltage -0.3 V 2.5 mA NEW PRODUCT IOUTPUT Characteristics Output current (source and sink) B Magnetic Flux Density Ts Storage Temperature Range PD Package Power Dissipation TJ Maximum Junction Temperature ESD Notes: Human Body Model ESD Unlimited -65 to +150 °C U-WLB0707-4 160 mW SOT553 230 mW 150 °C VDD, GND and OUT pins 8 kV BSEL pin 6 kV 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 VOL Output low voltage (on) IOUT = 1mA VOH Output high voltage (off) IOUT = -1mA BLsel Band select low band BHsel Band select high band RU_BSEL IDD(awake) IDD(sleep) IDD(avg) IDD(avg) BSEL pin internal pull-up resistor Supply current Average cupply current Max 0.1 0.2 VDD -0.2 VDD -0.1 V kΩ During ‘awake’ period 2.1 mA During ‘sleep’ period 2.5 µA VDD = 1.8V 4.3 8.0 µA VDD = 3.6V 7.2 13.0 µA 50 100 µs 50 100 ms Tperiod Awake period (Note 8) Duty cycle Band transition time 3.6 V 50 (Note 8) TBand V V 0.5 1.4 Unit (Note 7) Awake active pulse width Notes: Typ 0 Tawake D.C. Min 0.1 ( Note 9) 100.0 % 200.1 ms 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. AH1892 Document number: DS35092 Rev. 1 - 2 3 of 11 www.diodes.com May 2012 © Diodes Incorporated AH1892 PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR SWITCH Electrical Characteristics (cont.) Tperiod Tawake IDD(awake) NEW PRODUCT Tsleep Sample and output latched IDD(sleep) 0 Magnetic Characteristics (TA = +25°C, VDD = 1.6V to 3.6V, Note 10) (1mT=10 Gauss) BSEL Symbol Low BopsLB(south pole to brand side) Low BopnLB (north pole to brand side) Low BrpsLB (south pole to brand side) Low BrpnLB (north pole to brand side) High BopsHB(south pole to brand side) High BopnHB (north pole to brand side) High BrpsHB (south pole to brand side) High BrpnHB (north pole to brand side) Notes: Bhy (|Bopx|-|Brpx|) Characteristics Low Band - Operation Point Low Band - Release Point High Band - Operation Point High Band - Release Point Hysteresis Min Typ Max 18 35 55 -55 -35 -18 12 25 45 -45 -25 -12 43 60 80 -80 -60 -43 35 50 70 -70 -50 -35 - 10 - Unit Gauss 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. AH1892 Document number: DS35092 Rev. 1 - 2 4 of 11 www.diodes.com May 2012 © Diodes Incorporated AH1892 PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR SWITCH Application Note Applications Circuit One – Low Band NEW PRODUCT 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 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. AH1892 Document number: DS35092 Rev. 1 - 2 5 of 11 www.diodes.com May 2012 © Diodes Incorporated AH1892 PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR SWITCH Application Note (cont.) Bands Select Change Timing and Valid Output NEW PRODUCT 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. AH1892 Document number: DS35092 Rev. 1 - 2 6 of 11 www.diodes.com May 2012 © Diodes Incorporated AH1892 PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR SWITCH Typical Operating Characteristics Brpn -10 -20 -30 -40 -50 -60 -70 -50 Bopn -25 0 25 50 75 TEMPERATURE (°C) Switch Points vs. Temperature 100 70 70 60 60 50 40 30 20 10 0 50 40 30 20 10 0 -10 -20 -30 -40 -50 -60 -70 1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6 SUPPLY VOLTAGE (V) Switch Points vs. Supply Voltage AVERAGE SUPPLY CURRENT, IDD (avg) (µA) VDD = 1.8V and 3.6V 8 3.6V 7 6 5 1.8V 4 3 2 1 0 -50 -25 0 25 50 75 100 TEMPERATURE (°C) Average Supply Current vs. Temperature AH1892 Document number: DS35092 Rev. 1 - 2 Bhys Brpn Bopn -25 0 25 50 75 TEMPERATURE (°C) Switch Points vs. Temperature 100 Bops Brps Bhys -10 -20 TA = +25°C, Brpn Bopn -30 BSEL = High (VDD) -40 -50 -60 -70 1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6 SUPPLY VOLTAGE (V) Switch Points vs. Supply Voltage Average Supply Current IDD(avg) 10 9 Brps -10 GAUSS (G) GAUSS (G) -20 -30 -40 -50 -60 -70 -50 Bhys Bops 50 40 30 20 10 0 Brps GAUSS (G) GAUSS (G) Bops 50 40 30 20 10 0 AVERAGE SUPPLY CURRENT, IDD (avg)d (µA) NEW PRODUCT Typical switch points characterisitics in low band (BSEL = Low) and high band (BSEL = High) 70 V = 1.80V, BSEL = High (V ) 70 DD DD VDD = 1.80V, BSEL = Low (GND) 60 60 7 of 11 www.diodes.com 10 9 T A = +25°C 8 7 6 5 4 3 2 1 0 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 May 2012 © Diodes Incorporated AH1892 PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR SWITCH NEW PRODUCT Ordering Information Device Package Code AH1892-CD4-7 AH1892-Z-7 Notes: 7” Tape and Reel Packaging (Note 11) Quantity Part Number Suffix CD4 U-WLB0707-4 3000/Tape & Reel -7 Z SOT553 3000/Tape & Reel -7 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 Part Number Package Identification Code AH1892-Z-7 SOT553 B2 (2) Package type: SOT553 AH1892 Document number: DS35092 Rev. 1 - 2 8 of 11 www.diodes.com May 2012 © Diodes Incorporated AH1892 PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR SWITCH Package Outline Dimensions (All Dimensions in mm) NEW PRODUCT (1) Package type: U-WLB0707-4 AH1892 Document number: DS35092 Rev. 1 - 2 9 of 11 www.diodes.com May 2012 © Diodes Incorporated AH1892 PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR SWITCH Package Outline Dimensions (cont.) (2) Package type: SOT553 0.30 C D CL 6°~8 ° 2.2 C L 1.2 Die C L 1.7 0.1 0.45/0.67 CL 0.30±0.08 A 1.0Typ. 0.10/0.18 5x-0.5 0.30 C D 1.0Typ. Hall Sensor Pin1 0.5Typ. 0.30 C 1.55/1.70 D 1.10/1.25 NEW PRODUCT 1.50/1.70 0.15/0.30(5x) 0.10 M C A-B D B 0.55/0.62 6°~8° 6°~ Pin1 0.5Typ. 0.3 Land Pattern Recommendation (Unit:mm) Top View 8° AH1892 Document number: DS35092 Rev. 1 - 2 10 of 11 www.diodes.com May 2012 © Diodes Incorporated AH1892 PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR SWITCH IMPORTANT NOTICE NEW PRODUCT 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. 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