AH1894 PROGRAMMABLE HIGH SENSITIVITY MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH Description Pin Assignments The AH1894 is a high sensitivity micropower magnetic range selectable Omnipolar Hall effect switch IC with internal pull up and (Top View) pull down capability. Designed for portable and battery powered equipment such as cellular phones and portable PCs to home appliances and industrial applications, the average power consumption is only 8uW at 1.85V. To support portable equipment the AH1894 can operate over the supply range of 1.6V to 3.6V and uses X1-DFN1216-4 a hibernating clocking system to minimize the power consumption. To NEW PRODUCT minimize PCB space the AH1894 is available in small low profile X1-DFN1216-4 and SOT553 packages. (Top View) 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 SOT553 until B is lower than release point (Brp). 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 Switches in Portable PCs Micropower Operation Digital Still, Video Cameras and Handheld Gaming Consoles Chopper Stabilized Design Provides: Door, Lids and Tray Position Switches Superior Temperature Stability Level, Proximity and Position Switches 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 Contact-Less Switches in Home Appliances and Industrial Applications High ESD capability of 8kV (Human Body Model) on VDD, GND and OUTPUT Pins Small Low Profile X1-DFN1216-4 and SOT553 Packages 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/quality/lead_free.html 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. Typical Applications Circuit Note: 4. CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical. AH1894 Document number: DS35741 Rev. 1 - 2 1 of 13 www.diodes.com July 2013 © Diodes Incorporated AH1894 Pin Descriptions Package: X1-DFN1216-4 Pin Number 1 Pin Name OUTPUT 2 VDD 3 4 BSEL GND Function Output Pin Power Supply Input Band Select Ground Pin NEW PRODUCT Package: SOT553 Pin Number Pin Name 1 VDD 2 3 4 NC BSEL GND 5 Note: OUTPUT Function Power Supply Input No Connection (Note 5) Band Select Ground Output 5. NC is “No Connection” pin and is not connected internally. This pin can be left open or tied to ground. Functional Block Diagram AH1894 Document number: DS35741 Rev. 1 - 2 2 of 13 www.diodes.com July 2013 © Diodes Incorporated AH1894 Absolute Maximum Ratings (Note 6) (@TA = +25°C, unless otherwise specified.) Symbol Rating Unit VDD Supply Voltage (Note 7) 6 V VDD_REV Reverse Supply Voltage -0.3 V IOUTPUT Output current (source and sink) 3.5 mA NEW PRODUCT B Parameter Magnetic Flux Density PD Package Power Dissipation Ts Storage Temperature Range TJ Maximum Junction Temperature ESD HBM Notes: Unlimited 230 230 -65 to +150 X1-DFN1216-4 SOT553 VDD, GND and OUTPUT pins BSEL pin Human Body Model (HMB) ESD capability mW mW °C 150 °C 8 6 kV kV 6. 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. 7. 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 Parameter Conditions Rating Unit Supply Voltage Operating 1.6V to 3.6V V Operating Temperature Range Operating -40 to +85 °C Electrical Characteristics (@TA = +25°C, VDD = 1.85V, unless otherwise specified.) Symbol VOL VOH Parameter Output Low Voltage (on) Output High Voltage (off) IOUT = 1mA IOUT = -1mA Ioff Output Leakage Current VOUT = 3.6V, Output off VSEL_LB VSEL_HB RPD_BSEL BSEL pin input voltage – Low Band BSEL pin input voltage – High Band BSEL pin internal pull-down resistor IDD(awake) Supply Current IDD(sleep) IDD(avg) Average Supply Current Tawake Tperiod D.C. Awake Time Period Duty Cycle Notes: Conditions Min — VDD -0.2 Typ 0.1 VDD -0.1 Max 0.2 — Unit V V - < 0.1 1 µA 0 1.4 — — — 50 0.5 3.6 — V V kΩ — 2.1 — mA During ‘sleep’ period, TA = +25°C, VDD = 3V — 2.5 — mA TA = +25°C, VDD = 1.85V — 4.3 8 µA TA = +25°C, VDD = 3.6V — 7.2 13 µA (Note 9) (Note 9) (Note 10) — — — 50 50 0.1 100 100 — µs ms % (Note 8) During ‘awake’ period, TA = +25°C, VDD = 3V 8. BSEL pin internal pull-down resistor is only active during AWAKE time 9. 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). 10. Transition time varies dependant on the timing of BSEL activation during the sleep and awake phases. AH1894 Document number: DS35741 Rev. 1 - 2 3 of 13 www.diodes.com July 2013 © Diodes Incorporated AH1894 NEW PRODUCT Electrical Characteristics (cont.) Magnetic Characteristics (Note 11 &12) (TA = -40°C to +85°C, VDD = 1.85V, unless otherwise specified) BSEL Symbol Low Low Low Low High High High BopsLB (South pole to part marking side) BopnLB (North pole to part marking side) BrpsLB (South pole to part marking side) BrpnLB (North pole to part marking side) BopsHB (South pole to part marking side) BopnHB (North pole to part marking side) BrpsHB (South pole to part marking side) High — BrpnHB (North pole to part marking side) Bhy (|Bopx|-|Brpx|) Notes: Characteristics Low Band - Operation Point Low Band - Release Point High Band - Operation Point High Band - Release Point Hysteresis (1mT=10 Gauss) Max Unit Min Typ 15 -45 10 -35 25 -55 20 30 -30 20 -20 40 -40 30 45 -15 35 -10 55 -25 45 -45 — -30 10 -20 — Gauss 11. Typical data is at TA = +25C, VDD = 1.85V. 12. Maximum and minimum parameters values over the operating temperature range are not tested in production, they are guaranteed by design, process control and characterization. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering. The AH1894 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 AH1894 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 AH1894 defaults to low band. AH1894 Document number: DS35741 Rev. 1 - 2 4 of 13 www.diodes.com July 2013 © Diodes Incorporated AH1894 Application Notes Applications Circuit 1 – Low Band Leaving the BSEL pin unconnected or connecting the BSEL pin to ground permanently configures the AH1894 into its high sensitivity mode NEW PRODUCT (lower switching thresholds), requiring a reduced magnetic flux density to activate its output (Low Band). Applications Circuit 2 – High Band Connecting the BSEL pin to VDD or applying a voltage greater than 1.4V configures the AH1894 into its low sensitivity mode (higher switching threshold), requiring a higher magnetic flux density to activate its output (High Band). Applications Circuit 3 – Adjustable Sensitivity To enhance the 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, allow for band selection changeover to complete and output to be valid. AH1894 Document number: DS35741 Rev. 1 - 2 5 of 13 www.diodes.com July 2013 © Diodes Incorporated AH1894 Application Notes (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 after the band selection change is complete. 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 is up to 100ms typical and 200.1ms maximum NEW PRODUCT (TBC). AH1894 Document number: DS35741 Rev. 1 - 2 6 of 13 www.diodes.com July 2013 © Diodes Incorporated AH1894 Typical Operating Characteristics Typical Switch Points Characteristics in Low Band (BSEL = Low) and High Band (BSEL = High) V DD = 1.60V, BSEL = Low (GND) 60 60 50 50 20 Bops Brps 10 Bhy Gauss (G) 30 0 -10 Brpn -20 30 Bopn -30 -40 -50 NEW PRODUCT Bops Brps 40 Gauss (G) 40 VDD = 1.60V, BSEL = High (V DD ) 20 10 Bhy 0 -10 -20 -30 Brpn -40 Bopn -50 -60 -60 -50 -25 0 25 50 75 100 -50 -25 Temperature (°C) 60 60 50 50 75 100 VDD = 1.85V, BSEL = High (VDD ) Bops Brps 40 40 30 Bops 30 20 Brps Bhy 20 10 0 -10 Brpn -20 Gauss (G) Gauss (G) 50 Switch Points vs Temperature VDD = 1.85V, BSEL = Low (GND) Bopn -30 Bhy 10 0 -10 -20 Brpn -30 -40 -40 -50 -50 Bopn -60 -60 -50 -25 0 25 50 75 -50 100 -25 0 25 50 75 100 Temperature (°C) Temperature (°C) Switch Points vs Temperature Switch Points vs Temperature VDD = 3.0V, BSEL = Low (GND) V DD = 3.0V, BSEL = High (VDD ) 60 50 50 40 40 Bops Brps Bhy 20 10 0 -10 Brpn Bopn -20 -30 Bops Brps 30 20 Gauss (G) 30 Gauss (G) 25 Temperature (°C) Switch Points vs Temperature 60 0 10 Bhy 0 -10 -20 -30 Brpn -40 -40 Bopn -50 -50 -60 -60 -50 -25 0 25 50 75 100 -50 -25 0 25 50 Temperature (°C) Temperature (°C) Switch Points vs Temperature Switch Points vs Temperature AH1894 Document number: DS35741 Rev. 1 - 2 7 of 13 www.diodes.com 75 100 July 2013 © Diodes Incorporated AH1894 Typical Operating Characteristics (cont.) Typical Switch Points Characteristics in Low Band (BSEL = Low) and High Band (BSEL = High) V DD = 3.60V, BSEL = Low (GND) 60 VDD = 3.60V, BSEL = High (V DD ) 60 50 50 40 Gauss (G) 10 0 -10 Brpn -20 30 Gauss (G) 20 Bopn -30 20 Bhy 10 0 -10 -20 Brpn -30 -40 -40 -50 -50 -60 Bopn -60 -50 -25 0 25 50 75 100 -50 -25 0 Temperature (°C) 25 50 75 100 Temperature (°C) Switch Points vs Temperature Switch Points vs Temperature Average Supply Current IDD (avg) VDD = 1.60V to 3.60V 10 9 8 7 3.6V 6 5 1.85V 1.6V 4 3 2 1 0 -50 -25 0 25 50 75 100 Average Supply Current IDD (μA) Average Supply Current IDD (μA) NEW PRODUCT Bops Brps 40 Bops Brps Bhy 30 10 9 8 6 Bhy 5 4 3 2 Brpn Bopn 1 0 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 Document number: DS35741 Rev. 1 - 2 Bops Brps 7 Temperature (°C) AH1894 TA = +25 °C Average Supply Current vs. Supply Voltage 8 of 13 www.diodes.com July 2013 © Diodes Incorporated AH1894 NEW PRODUCT Ordering Information Part Number Package Code Packaging AH1894-FA-7 AH1894-Z-7 FA Z X1-DFN1216-4 SOT553 7” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 3000/Tape & Reel -7 Marking Information (1) (2) Package Type: X1-DFN1216-4 Part Number AH1894-FA-7 Package X1-DFN1216-4 Identification Code B4 Part Number AH1894-Z-7 Package SOT553 Identification Code B4 Package Type: SOT553 AH1894 Document number: DS35741 Rev. 1 - 2 9 of 13 www.diodes.com July 2013 © Diodes Incorporated AH1894 Package Outline Dimensions (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version. (1) Package Type: X1-DFN1216-4 A 3 A 1 A e n a l P g n i t a e S ︶ ° 5 4 x 2 . 0 ' C ︵ D I 1 # n i P E 2 E NEW PRODUCT De X1-DFN1216-4 Dim Min Max Typ A 0.47 0.53 0.50 A1 0.00 0.05 0.02 A3 --0.13 b 0.15 0.25 0.20 D 1.15 1.25 1.20 D2 0.75 0.95 0.85 E 1.55 1.65 1.60 E2 0.55 0.75 0.65 e 0.65 L 0.20 0.30 0.25 Z 0.175 All Dimensions in mm L 2 D b Z Bottom View Sensor Location AH1894 Document number: DS35741 Rev. 1 - 2 10 of 13 www.diodes.com July 2013 © Diodes Incorporated AH1894 Package Outline Dimensions (cont.) (All dimensions in mm.) (2) Package Type: SOT553 D e1 E1/2 e E/2 NEW PRODUCT E1 E L (5x) F R0.1 MAX. TYP. b (5x) c a 7° A SOT553 Dim Min Max Typ A 0.55 0.62 0.60 b 0.15 0.30 0.20 c 0.10 0.18 0.15 D 1.50 1.70 1.60 E 1.55 1.70 1.60 E1 1.10 1.25 1.20 e 0.50 BSC e1 1.00 BSC F 0.00 0.10 –– L 0.10 0.30 0.20 a 6° 8° 7° All Dimensions in mm TYP. Sensor Location AH1894 Document number: DS35741 Rev. 1 - 2 11 of 13 www.diodes.com July 2013 © Diodes Incorporated AH1894 Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) Package Type: X1-DFN1216-4 1 X C X1-DFN1216-4 Y NEW PRODUCT 1 Y 2 Y Dimensions Value C 0.65 X 0.25 X1 0.90 Y 0.50 Y1 0.70 Y2 2.00 All Dimensions in mm X (2) Package Type: SOT553 C2 Z C2 SOT553 Dimensions Value Z 2.2 G 1.2 X 0.375 Y 0.5 C1 1.7 C2 0.5 All Dimensions in mm C1 G Y X AH1894 Document number: DS35741 Rev. 1 - 2 12 of 13 www.diodes.com July 2013 © Diodes Incorporated AH1894 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). 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