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AH1903 document number: ds36568 rev. 3 - 2 1 of 11 www.diodes.com june 2014 ? diodes incorporated new product a h1903 high sensitivity micropower unipolar/omnipolar select able hall-effect switch description the AH1903 is a high sensitivity mi cropower omnipolar or unipolar selectable hall effect switch ic with internal pull up and pull down capability. designed for battery powered consumer equipment such as cellular phones and portable pcs to office equipment, home appliances and industrial applications , the average supply current is only 4.3a at 1.8v. to support portable equipment the AH1903 can operate over the supply range of 1.6v to 3.6v and uses a hibernating clocking system to minimize the power consumption. to minimize pcb space the AH1903 is available in a small low profile x1-dfn1216-4 package. the user can change the hall switch function between unipolar and omnipolar operation via the select (sel) pin. if the sel pin is open circuit or pulled high the AH1903 oper ates in unipolar switch mode detecting magnetic field direction with a south pole to the part mark side of the package. if the sel pin is pulled low the AH1903 functions as a omnipolar switch detecting ei ther a north or south pole. the output is activated with a pole of sufficient magnetic field strength. 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). features ? unipolar or omnipolar operation ? operation can be changed by a logic source or fixed via pcb design with no additional components ? supply voltage of 1.6v to 3.6v ? high sensitivity ? micropower operation ? chopper stabilized design provides ? superior temperature stability ? minimal switch point drift ? enhanced immunity to physical stress ? no external pull-up resistors required ? good rf noise immunity ? -40c to +85c operating temperature ? high esd capability of 8kv (human body model) on v dd , gnd and output pins ? small low profile x1-dfn1216-4 package ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) pin assignments applications ? open and close detect for flip/slide cellular phones ? smart cover or dock detect for cellular phones and tablet pcs ? cover or display switch in portable pcs (eg ultrabook) ? digital still, video cameras and handheld gaming consoles ? door, lids and tray position switches ? level, proximity and position switches ? contact-less switches in home appliances and industrial applications typical application circuit notes: 1. no purposely added lead. fully eu directiv e 2002/95/ec (rohs) & 2011/6 5/eu (rohs 2) compliant. 2. see http://www.diodes.com/quality/lead_free.html for more in formation about diodes incorporated?s definitions of halogen- a nd 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. 4. c in is for power stabilization and to strengthen the noise imm unity, the recommended capacitance is 100nf typical and should be pl aced as close to the supply pin as possible.
AH1903 document number: ds36568 rev. 3 - 2 2 of 11 www.diodes.com june 2014 ? diodes incorporated new product a h1903 pin descriptions package: x1-dfn1216-4 pin number pin name function 1 output output pin 2 gnd ground pin 3 sel unipolar or omnipolar operation select pin; for unipolar operation, pull-up the sel pin to v dd or leave it unconnected. the sel pin is internally pulled high. for omnipolar operation, c onnect the sel pin to gnd. 4 v dd power supply input pad pad the center exposed pad - it is internally connected to v dd pin and should not be connected to gnd or any other signal on the pcb. the exposed pad should be left open (unconnected) on the pcb layout. functional block diagram absolute maximum ratings (note 5) (@t a = +25c, unless otherwise specified.) symbol parameter rating unit v dd supply voltage (note 6) 6 v v dd_rev reverse supply voltage -0.3 v i output output current (source and sink) 3 ma b magnetic flux density unlimited p d package power dissipation x1-dfn1216-4 230 mw ts storage temperature range -65 to +150 c t j maximum junction temperature 150 c esd hbm human body model (hmb) esd capability v dd , gnd and output pins 8 kv logic sel 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 v dd 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.
AH1903 document number: ds36568 rev. 3 - 2 3 of 11 www.diodes.com june 2014 ? diodes incorporated new product a h1903 recommended operating conditions (@t a = +25c, unless otherwise specified.) symbol parameter conditions rating unit v dd supply voltage operating 1.6v to 3.6v v t a operating temperature range operating -40 to +85 c electrical characteristics (@t a = +25c, v dd = 1.8v, unless otherwise specified.) symbol parameter conditions min typ max unit v ol output low voltage (on) i out = 1ma ? 0.1 0.2 v v oh output high voltage (off) i out = -1ma v dd -0.2 v dd -0.1 ? v sel low omnipolar operation selected 0 ? 0.5 v sel high unipolar operation selected 1.4 ? 3.6 v r u sel bsel pin internal pull-up resistor (note 7) ? 50 k ? ioff output leakage current v out = 3.6v, output off ? < 0.1 1 a i dd (awake) supply current during ?awake? period, t a = +25c, v dd = 3v ? 2.1 ? ma i dd (sleep) during ?sleep? period, t a = +25c, v dd = 3v ? 2.5 ? a i dd (avg) average supply current t a = +25c, v dd = 1.8v ? 4.3 8 a t a = +25c, v dd = 3.6v ? 7.2 13 a tawake awake time (note 8) ? 50 100 s tperiod period (note 8) ? 50 100 ms d.c. duty cycle ? 0.1 ? % notes: 7. sel pin internal pull-up resistor is only active during awake time. 8. when power is initially on, the operating v dd (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). electrical characteristics (cont.)
AH1903 document number: ds36568 rev. 3 - 2 4 of 11 www.diodes.com june 2014 ? diodes incorporated new product a h1903 magnetic characteristics (notes 9 &10) (t a = +25c, v dd = 1.8v, unless otherwise specified) unipolar operation: sel = high ( > 1.4v to v dd or no connection) (1mt=10 gauss) symbol characteristics test condition min typ max unit bops (south pole to part marking side) operation point 23 33 47 gauss v dd = 1.6v to 3.6v t a = -40c to +85c 21 33 48 brps (south pole to part mark ing side) release point 12 23 35 v dd = 1.6v to 3.6v t a = -40c to +85c 9 23 38 bhy (|bopx|-|brpx|) hysteresis ? 10 ? omnipolar operation: sel = low (gnd or <0.5v) (1mt=10 gauss) symbol characteristics test condition min typ max unit bops (south pole to part marking side) operation point 23 33 47 gauss v dd = 1.6v to 3.6v t a = -40c to +85c 21 33 48 bopn (north pole to part marking side) -47 -33 -23 v dd = 1.6v to 3.6v t a = -40c to +85c -48 -33 -21 brps (south pole to part marking side) release point 12 23 35 v dd = 1.6v to 3.6v t a = -40c to +85c 9 23 38 brpn (north pole to part marking side) -35 -23 -12 v dd = 1.6v to 3.6v t a = -40c to +85c -38 -23 -9 bhy (|bopx|-|brpx|) hysteresis ? 10 ? notes: 9. typical data is at t a = +25c, v dd = 1.8v. 10. maximum and minimum parameters values over operating temp erature range are not tested in production, they are guaranteed by design, characterization and process control. the magnetic characteristics may vary with s upply voltage, operating temperature and afte r soldering.
AH1903 document number: ds36568 rev. 3 - 2 5 of 11 www.diodes.com june 2014 ? diodes incorporated new product a h1903 application notes the AH1903 includes a hall switch function select pin (sel) so that the AH1903 can be changed between an unipolar or an omnipol ar hall switch operation to fit a multitude of applications. the diagram s below show the different switching functions between the unip olar and the omnipolar hall switch types. AH1903 in unipolar operation in unipolar mode, the sensor detects t he magnetic flux density perpendicular to the par t marking surface with magnetic field di rection only from the back to the front of the package as shown below. this magnet ic field direction is similar to having a south pole on the p art marking side or a north pole to the back of the package. magnetic field direction for unipolar mode operation AH1903 in omnipolar operation in omnipolar mode, the sensor detects the magnetic flux density perpendicular to the part marking surface with magnetic field d irections from the front to the back as well as from the back to the front of the package as shown below. the sensor detects both north or south p ole to the part marking side or to the back of the package. magnetic field directions fo r omnipolar mode operation the AH1903 includes a function select pin (sel) to change the de vice type between unipolar and om nipolar operations. the sel pi n can be hard wired within the application circuit or can be changed on the fly by using the sel pin as a logic input. this feature allo ws the AH1903 operating mode to be changed by firmware within the application wi thout the addition of any external components. if the sel pi n is left open circuit the AH1903 defaults to unipolar mode.
AH1903 document number: ds36568 rev. 3 - 2 6 of 11 www.diodes.com june 2014 ? diodes incorporated new product a h1903 application notes (cont.) applications circuit 1 ? unipolar operation connecting the sel pin to v dd , a voltage greater than 1.4v or leaving the sel pin unconnec ted configures the AH1903 into unipolar mode, only detecting south pole of sufficient strength from the part mark si de of the package. in unipoalr mode, north pole fields will no t switch on the output. applications circuit 2 ? omnipolar operation connecting the sel pin to ground configures the AH1903 into omni polar mode, detecting both north and south magnetic fields of s ufficient strength. applications circuit 3 ? adjustable sensor type to enhance flexibility within the application the sensor operati on modes can be selected with a standard logic signal allowing it to be controlled by a micro-controller or a logic source. this allows the sensor type to be changed within the application without a hardware ch ange. whenever the hall switch type is changed, the selection changeover s hould allow two awake period for the output to be valid. sensor type change timing and valid output whenever type selection sel 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 t he output to be valid, after the sel change, depends on timing of sel change during the sleep and awake phase; this time can range from 100ms typical and 200.1ms maximum.
AH1903 document number: ds36568 rev. 3 - 2 7 of 11 www.diodes.com june 2014 ? diodes incorporated new product a h1903 typical operating characteristics operating switch points in unipolar operation (sel = no connection or sel = v dd ) 0 10 20 30 40 50 60 -50-25 0 255075100 gauss (g) temperature ( c) switch points vs temperature v dd = 1.6v, sel = high (v dd or no connection) bops brps bhys 0 10 20 30 40 50 60 -50-25 0 255075100 gauss (g) temperature ( c) switch points vs temperature v dd = 1.8v, sel = high (v dd or no connection) bops brps bhys 0 10 20 30 40 50 60 -50 -25 0 25 50 75 100 gauss (g) temperature ( c) switch points vs temperature v dd = 3.6v, sel = high (v dd or no connection) bops brps bhys 0 10 20 30 40 50 60 1.5 1.8 2.1 2.4 2.7 3 3.3 3.6 3.9 gauss (g) temperature ( c) switch points vs temperature t a = +25 c, sel = high ( v dd or ? no connection) bops brps bhy
AH1903 document number: ds36568 rev. 3 - 2 8 of 11 www.diodes.com june 2014 ? diodes incorporated new product a h1903 typical operating characteristics (cont.) operating switch points in omnipolar operation (sel = gnd) average supply cu r rent - unipolar or omnipolar operations -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 -50 -25 0 25 50 75 100 gauss (g) temperature ( c) switch points vs temperature v dd = 1.6v, sel = low (gnd) brpn bops bopn brps bhy -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 -50 -25 0 25 50 75 100 gauss (g) temperature ( c) switch points vs temperature v dd = 1.8v, sel = low (gnd) brpn bops bopn brps bhy -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 -50-25 0 255075100 gauss (g) temperature ( c) switch points vs temperature v dd = 3.6v, sel = low (gnd) brpn bops bopn brps bhy -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 1.5 1.8 2.1 2.4 2.7 3 3.3 3.6 3.9 gauss (g) temperature ( c) switch points vs temperature t a = +25 c, sel = low (gnd) brpn bops bopn brps bhy 0 1 2 3 4 5 6 7 8 9 10 -50-250 255075100 average supply current i dd ( a) temperature (c) average supply current vs. temperature 1.8v 1.6v 3.6v 0 1 2 3 4 5 6 7 8 9 10 1.5 1.8 2.1 2.4 2.7 3 3.3 3.6 3.9 average supply current i dd ( a) supply voltage (v) average supply current vs. supply voltage t a = +25 c
AH1903 document number: ds36568 rev. 3 - 2 9 of 11 www.diodes.com june 2014 ? diodes incorporated new product a h1903 ordering information part number package code packaging 7? tape and reel quantity part number suffix AH1903-fa-7 fa x1-dfn1216-4 3000/tape & reel -7 marking information (1) package type: x1-dfn1216-4 part number package identification code AH1903-fa-7 x1-dfn1216-4 f3
AH1903 document number: ds36568 rev. 3 - 2 10 of 11 www.diodes.com june 2014 ? diodes incorporated new product a h1903 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 bottom view sensor location (to be confirmed) suggested pad layout please see ap02001 at http://www.diodes.com/dat asheets/ap02001.pdf for the latest version. (1) package type: x1-dfn1216-4 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 dimensions value c 0.65 x 0.25 x1 0.90 y 0.50 y1 0.70 y2 2.00 all dimensions in mm z a 1 c ' 0 . 2 x 4 5 d d 2 e e b l e 2 a a 3 p i n # 1 i d s e a t i n g p l a n e x 1 y 2 y 1 y c x
AH1903 document number: ds36568 rev. 3 - 2 11 of 11 www.diodes.com june 2014 ? diodes incorporated new product a h1903 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 rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product descri bed herein. diodes incorporated does not assume any liability ari sing out of the application or use of this document or an y product described herein; neither does di odes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or us er of this document or products described herein in such applica tions 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 w hatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or una uthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death a ssociated 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. this document is written in english but may be translated into multiple languages for reference. only the english version of t his document is the final and determinative format released by diodes incorporated. life support diodes incorporated products are specifically not authorized for use as critical component s in life support devices or systems without the express written approval of the chief executive offi cer of diodes incorporated. as used herein: a. life support devices or syst ems 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 prope rly used in accordance with instructions for use provided in the labeling can be reasonably expected to re sult in significant injury to the user. b. a critical component is any component in a life support devic e or system whose failure to perform can be reasonably expect ed 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 ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-rel ated requirements concerning the ir products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporate d and its representatives against any damages arisi ng out of the use of diodes incorporated pr oducts in such safety-critical, life suppor t devices or systems. copyright ? 2014, diodes incorporated www.diodes.com

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