AH1898 PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH Description Pin Assignments The AH1898 is a micropower magnetic range selectable (Bop/Brp) Omnipolar Hall effect switch IC with internal pull up and pull down capability, designed for portable and battery powered consumer equipment such as cellular phones and portable PCs. To support battery powered equipment and low voltage microcontrollers, the (Top View) AH1898 can operate over the supply range of 1.6V to 3.6V and uses (Bottom View) a hibernating clocking system to minimize the power consumption. NEW PRODUCT The average supply current is only 4.3µA typical at 1.80V. The AH1898 has an 8kV ESD rating on the supply and output pins. To minimize PCB space the AH1898 is packaged in the small CSP package (0.81mm x 0.81mm typical). 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 U-WLB0808-4 can be hardwired or be changed on the fly via a logic source such as a micro-controller. When the magnetic flux density (B) perpendicular to the package is larger than operate point (Bop), the output will be turned on (pulled low) and held until B is lower than release point (Brp). The output will remain off when there is no magnetic field. Features Applications Omnipolar Operation (North or South pole) Open and Close Detect for Cellular Phones Programmable Operate and Release Points Holster or Cover Detect for Cellular Phones and Tablet PCs Supply Voltage of 1.6V to 3.6V Cover or Display Switch in Portable PCs Micropower Operation Digital Still, Video Cameras and Handheld Gaming Consoles Chopper Stabilized Design Provides Proximity and Position Switches Superior Temperature Stability Minimal Switch Point Drift Enhanced Immunity to Physical Stress No External Pull-up Resistors Required Good RF Noise Immunity -40°C to +85°C Operating Temperature 8kV Human Body Model ESD Capability Miniature U-WLB0808-4 (CSP 0.81mm x 0.81mm typical) Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) 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. 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. AH1898 Document number: DS36028 Rev. 1 - 2 1 of 11 www.diodes.com February 2013 © Diodes Incorporated AH1898 NEW PRODUCT Typical Applications Circuit Note: 4. CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical. Pin Descriptions Package: U-WLB0808-4 Pin Number Pin Name A1 BSEL Band Select Pin to select operating and release gauss points Function A2 GND Ground Pin B1 VDD Power Supply Input B2 OUTPUT Output Pin Functional Block Diagram AH1898 Document number: DS36028 Rev. 1 - 2 2 of 11 www.diodes.com February 2013 © Diodes Incorporated AH1898 Absolute Maximum Ratings (Note 5) (@TA = +25°C, unless otherwise specified.) Symbol Rating Unit VDD Supply Voltage (Note 6) 6 V VDD_REV Reverse Supply Voltage -0.3 V IOUTPUT B Output Current (source and sink) 2.5 mA Magnetic Flux Density Storage Temperature Range TJ Maximum Junction Temperature Notes: Unlimited Package Power Dissipation PD Ts ESD HBM NEW PRODUCT Parameter U-WLB0808-4 160 °C 150 °C 8 kV 6 kV VDD, GND and OUT pins BSEL pin Human Body Model (HMB) ESD capability mW -65 to +150 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 (@TA = +25°C, unless otherwise specified.) Symbol VDD TA Conditions Rating Unit Supply Voltage Parameter Operating 1.6V to 3.6V V Operating Temperature Range Operating -40 to +85 C Electrical Characteristics (@TA = +25°C, VDD = 1.8V, unless otherwise specified.) Symbol Parameter Conditions VOL Output Low Voltage (on) IOUT = 1mA VOH Output High Voltage (off) IOUT = -1mA Min Typ Max — 0.1 0.2 V — V V VDD -0.2 VDD -0.1 Unit VSEL_LB Bans select voltage for low band 0 — 0.5 VSEL_HB Bans select voltage for high band 1.4 — 3.6 V RPU_BSEL BSEL pin internal pull-up resistor (Note 7) — 50 — kΩ During ‘awake’ period — 2.1 — mA During ‘sleep’ period — 2.5 — mA VDD = 1.8V — 4.3 8 µA VDD = 3.6V — 7.2 13 µA (Note 8) (Note 8) — — 50 50 100 100 µs ms — 0.1 — % — 100.0 200.1 ms IDD(awake) IDD(sleep) Supply Current IDD(avg) Average Supply Current Tawake Tperiod Awake Time Period D.C. Duty Cycle tBAND Band transition time Notes: (Note 9) 7. BSEL pin internal pull-up resistor is only active during AWAKE time. 8. When power is initially turned 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. AH1898 Document number: DS36028 Rev. 1 - 2 3 of 11 www.diodes.com February 2013 © Diodes Incorporated AH1898 Magnetic Characteristics (Note 10 & 11) (TA = +25°C, VDD = 1.6V to 3.6V, unless otherwise specified) NEW PRODUCT BSEL Symbol Low BopsLB (south pole to part marking side side) Low BopnLB (north pole to part marking side side) Low BrpsLB (south pole to part marking side side) Low BrpnLB (north pole to part marking side side) High BopsHB (south pole to part marking side side) High BopnHB (north pole to part marking side side) High BrpsHB (south pole to part marking side side) High BrpnHB (north pole to part marking side side) Bhy (|Bopx|-|Brpx|) Notes: Characteristics Low Band - Operation Point Low Band - Release Point High Band - Operation Point High Band - Release Point Hysteresis Min Typ (1mT=10 Gauss) Max Unit 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 — Gauss 10. Typical data is at TA = +25C, VDD = 1.8V. 11. Magnetic characteristics may vary with operating temperature and after soldering. The AH1898 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 AH1898 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 AH1898 defaults to high band. AH1898 Document number: DS36028 Rev. 1 - 2 4 of 11 www.diodes.com February 2013 © Diodes Incorporated AH1898 Application Note Applications Circuit One – Low Band Connecting the BSEL pin to ground permanently configures the AH1898 into its high sensitivity mode, requiring a reduced magnetic flux density NEW PRODUCT 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 AH1898 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. AH1898 Document number: DS36028 Rev. 1 - 2 5 of 11 www.diodes.com February 2013 © Diodes Incorporated AH1898 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 NEW PRODUCT 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 transition time (tBAND) can range from 100ms typical and 200.1ms maximum. AH1898 Document number: DS36028 Rev. 1 - 2 6 of 11 www.diodes.com February 2013 © Diodes Incorporated AH1898 Typical Operating Characteristics Typical switch points characteristics in low band (BSEL = Low) and high band (BSEL = High) VDD = 1.80V, BSEL = Low (GND) 80 60 Bops Brps Bhy 20 0 -20 Brpn Bopn -40 40 Gauss (G) Gauss (G) Bops Brps 60 40 NEW PRODUCT VDD = 1.80V, BSEL = High (VDD ) 80 20 Bhy 0 -20 -40 -60 Brpn Bopn -60 -80 -80 ‐50 ‐25 0 25 50 75 -50 100 -25 0 Temperature (Ԩ) Switch Points vs. Temperature 100 Bops Brps 60 Bops Brps Bhy 20 0 Brpn Bopn -20 -40 40 Gauss (G) 40 Gauss (G) 75 V DD = 3.30V, BSEL = High (V DD ) 80 60 20 Bhy 0 ‐20 ‐40 -60 Brpn Bopn ‐60 -80 -50 -25 0 25 50 75 ‐80 100 -50 -25 0 25 50 75 Temperature (Ԩ) Temperature (Ԩ) Switch Points vs. Temperature Switch Points vs. Temperature TA = +25oC, BSEL = Low (GND) 80 Bops Brps 60 Bops Brps Bhy 20 0 Brpn Bopn -20 -40 -60 40 Gauss (G) 40 20 Bhy 0 ‐20 ‐40 Brpn Bopn ‐60 -80 1.5 1.8 2.1 2.4 2.7 3 3.3 3.6 3.9 ‐80 Supply voltage (V) Document number: DS36028 Rev. 1 - 2 1.5 1.8 2.1 2.4 2.7 3 3.3 3.6 3.9 Supply voltage (V) Switch Points vs. Supply Voltage AH1898 100 TA = +25oC, BSEL = High (VDD ) 80 60 Gauss (G) 50 Switch Points vs. Temperature VDD = 3.30V, BSEL = Low (GND) 80 25 Temperature (Ԩ ) Switch Points vs. Supply Voltage 7 of 11 www.diodes.com February 2013 © Diodes Incorporated AH1898 Typical Operating Characteristics (cont.) V DD = 1.80V and 3.60V 10 9 8 3.6V 7 6 5 1.8V 4 3 2 1 0 -50 -25 0 25 50 75 100 Avg. Supply Current IDD(avg) (uA) Avg. Supply Current IDD(avg) (uA) NEW PRODUCT Average Supply Current IDD(avg) TA = +25oC 10 9 8 7 6 5 4 3 2 1 0 Temperature (Ԩ) 1.5 1.8 2.1 2.4 2.7 3 3.3 3.6 3.9 Supply voltage (V) Average Supply Current vs. Temperature Average Supply Current vs. Supply Voltage Ordering Information Part Number Package Code Packaging AH1898-CA4-7 CA4 U-WLB0808-4 7” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 Marking Information (1) Package Type: U-WLB0808-4 Part Number AH1898-CA4-7 AH1898 Document number: DS36028 Rev. 1 - 2 Package U-WLB0808-4 8 of 11 www.diodes.com Identification Code B8 February 2013 © Diodes Incorporated AH1898 Package Outline Dimensions (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version. (1) Package Type: U-WLB0808-4 D e D I 1 # N I P 4 X b Ø NEW PRODUCT e E ︵ ︶ 2 A A U-WLB0808-4 Dim Min Max Typ A 0.511 REF A2 0.336 0.366 0.351 A3 0.15 0.17 0.16 b 0.205 0.225 0.215 D 0.795 0.825 0.81 E 0.795 0.825 0.81 e 0.40 All Dimensions in mm 3 A E N A L P G N I T A E S Sensor Location Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) Package Type: U-WLB0808-4 X 4 D Ø C U-WLB0808-4 Dimensions Value C 0.40 D 0.172 All Dimensions in mm C AH1898 Document number: DS36028 Rev. 1 - 2 9 of 11 www.diodes.com February 2013 © Diodes Incorporated AH1898 Taping Orientation NEW PRODUCT Package Type: U-WLB0808-4 AH1898 Document number: DS36028 Rev. 1 - 2 10 of 11 www.diodes.com February 2013 © Diodes Incorporated AH1898 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). NEW PRODUCT 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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