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AH1898 document number: ds36028 rev. 1 - 2 1 of 11 www.diodes.com february 2013 ? diodes incorporated new product a h1898 programmable micropower omnipolar hall-effect switch description 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 AH1898 can operate over the supply range of 1.6v to 3.6v and uses a hibernating clocking system to mi nimize the power consumption. the average supply current is only 4.3a typical at 1.80v. the AH1898 has an 8kv esd rating on t he 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 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 ? omnipolar operation (north or south pole) ? programmable operate and release points ? supply voltage of 1.6v to 3.6v ? 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 ? 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) pin assignments (top view) (bottom view) u-wlb0808-4 applications ? open and close detect for cellular phones ? holster or cover detect for cellular phones and tablet pcs ? cover or display switch in portable pcs ? digital still, video cameras and handheld gaming consoles ? proximity and position switches 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 for more in formation about diodes incorpor ated?s definitions of halogen- and antimony-free, "gree n" and lead-free. 3. halogen- and antimony-free "green? products are defined as those which contain <900ppm br omine, <900ppm chlorine (<1500ppm t otal br + cl) and <1000ppm antimony compounds. http://www..net/ datasheet pdf - http://www..net/
AH1898 document number: ds36028 rev. 1 - 2 2 of 11 www.diodes.com february 2013 ? diodes incorporated new product a h1898 typical applications circuit note: 4. c in is for power stabilization and to strengthen the noise immunity, the recommended capa citance is 100nf typical. pin descriptions package: u-wlb0808-4 pin number pin name function a1 bsel band select pin to select operating and release gauss points a2 gnd ground pin b1 v dd power supply input b2 output output pin functional block diagram http://www..net/ datasheet pdf - http://www..net/
AH1898 document number: ds36028 rev. 1 - 2 3 of 11 www.diodes.com february 2013 ? diodes incorporated new product a h1898 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) 2.5 ma b magnetic flux density unlimited p d package power dissipation u-wlb0808-4 160 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 out pins 8 kv bsel 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. 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 v sel_lb bans select voltage for low band 0 ? 0.5 v v sel_hb bans select voltage for high band 1.4 ? 3.6 v r pu_bsel bsel pin internal pull-up resistor (note 7) ? 50 ? k ? i dd (awake) supply current during ?awake? period ? 2.1 ? ma i dd (sleep) during ?sleep? period ? 2.5 ? ma i dd (avg) average supply current v dd = 1.8v ? 4.3 8 a 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 ? % t band band transition time (note 9) ? 100.0 200.1 ms notes: 7. bsel pin internal pull-up resistor is only active during awake time. 8. when power is initially turned 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). 9. transition time varies dependant on the timing of bsel activation during the sleep and awake phases. http://www..net/ datasheet pdf - http://www..net/
AH1898 document number: ds36028 rev. 1 - 2 4 of 11 www.diodes.com february 2013 ? diodes incorporated new product a h1898 magnetic characteristics (note 10 & 11) (t a = +25c, v dd = 1.6v to 3.6v, unless otherwise specified) (1mt=10 gauss) bsel symbol characteristics min typ max unit low bops lb (south pole to part marking side side) low band - operation point 18 35 55 gauss low bopn lb (north pole to part marking side side) -55 -35 -18 low brps lb (south pole to part marking side side) low band - release point 12 25 45 low brpn lb (north pole to part marking side side) -45 -25 -12 high bops hb (south pole to part marking side side) high band - operation point 43 60 80 high bopn hb (north pole to part marking side side) -80 -60 -43 high brps hb (south pole to part marking side side) high band - release point 35 50 70 high brpn hb (north pole to part marking side side) -70 -50 -35 bhy (|bopx|-|brpx|) hysteresis ? 10 ? notes: 10. typical data is at t a = +25 ? c, v dd = 1.8v. 11. magnetic characteristics may vary with operating temperature and after soldering. the AH1898 includes a band select pin (bsel) so that the operat e (bops and bopn) and release (b rps and brpn) points can be adju sted between two pre-defined ranges. the bsel can be hard wired within the app lication circuit or the band can be selected on the fly by usi ng 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. http://www..net/ datasheet pdf - http://www..net/
AH1898 document number: ds36028 rev. 1 - 2 5 of 11 www.diodes.com february 2013 ? diodes incorporated new product a h1898 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 magneti c flux density to activate its output (low band). applications circuit two ? high band connecting the bsel pin to v dd or to a voltage greater than 1.4v or leaving the bsel pin unconnected configures the AH1898 into its low sensitivity mode, requiring a highe r magnetic flux density to activate its output (high band). applications circuit three ? adjustable sensitivity to enhance flexibility within the application, the sensitivity c an be adjusted with a standard logic signal allowing it to be c ontrolled by a micro- controller or a logic source. this allows the sensitivity to be changed within the application without a hardware change. when ever the sensitivity band selection is changed, the band selection changeover should be allowed to complete for the output to be valid. http://www..net/ datasheet pdf - http://www..net/
AH1898 document number: ds36028 rev. 1 - 2 6 of 11 www.diodes.com february 2013 ? diodes incorporated new product a h1898 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 after the second complete operating ?awake? phase. time taken for the output to be valid, after the bsel change, depends on ti ming of bsel change during the sleep and awake phas e; this transition time (t band ) can range from 100ms typical and 200.1ms maximum. http://www..net/ datasheet pdf - http://www..net/
AH1898 document number: ds36028 rev. 1 - 2 7 of 11 www.diodes.com february 2013 ? diodes incorporated new product a h1898 typical operating characteristics typical switch points characteristics in low band (bsel = low) and high band (bsel = high) -80 -60 -40 -20 0 20 40 60 80 \ 50 \ 25 0 25 50 75 100 gauss (g) temperature ( ( ) switch points vs. temperature brps bops brpn bopn bhy v dd = 1.80v, bsel = low (gnd) -80 -60 -40 -20 0 20 40 60 80 -50 -25 0 25 50 75 100 gauss (g) temperature ( ( ) switch points vs. temperature bops brps bhy brpn bopn v dd = 1.80v, bsel = high (v dd ) -80 -60 -40 -20 0 20 40 60 80 -50-250 255075100 gauss (g) temperature ( ( ) switch points vs. temperature v dd = 3.30v, bsel = low (gnd) brps bops brpn bopn bhy \ 80 \ 60 \ 40 \ 20 0 20 40 60 80 -50 -25 0 25 50 75 100 gauss ? (g) temperature ( ( ) switch points vs. temperature brps bops brpn bopn bhy v dd = 3.30v, bsel = high (v dd ) -80 -60 -40 -20 0 20 40 60 80 1.5 1.8 2.1 2.4 2.7 3 3.3 3.6 3.9 gauss (g) supply voltage (v) switch points vs. supply voltage t a = +25 o c, bsel = low (gnd) brps bops brpn bopn bhy \ 80 \ 60 \ 40 \ 20 0 20 40 60 80 1.5 1.8 2.1 2.4 2.7 3 3.3 3.6 3.9 gauss ? (g) supply ? voltage ? (v) switch ? points ? vs. ? supply ? voltage t a = +25 o c, bsel = high (v dd ) brps bops brpn bopn bhy http://www..net/ datasheet pdf - http://www..net/
AH1898 document number: ds36028 rev. 1 - 2 8 of 11 www.diodes.com february 2013 ? diodes incorporated new product a h1898 typical operating characteristics (cont.) average supply current i dd (avg) ordering information part number package code packaging 7? tape and reel quantity part number suffix AH1898-ca4-7 ca4 u-wlb0808-4 3000/tape & reel -7 marking information (1) package type: u-wlb0808-4 part number package identification code AH1898-ca4-7 u-wlb0808-4 b8 0 1 2 3 4 5 6 7 8 9 10 -50 -25 0 25 50 75 100 avg. supply current i dd (avg) (ua) temperature ( ( ) average supply current vs. temperature 3.6v 1.8v v dd = 1.80v and 3.60v 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 avg. supply current i dd (avg) (ua) supply voltage (v) average supply current vs. supply voltage t a = +25 o c http://www..net/ datasheet pdf - http://www..net/
AH1898 document number: ds36028 rev. 1 - 2 9 of 11 www.diodes.com february 2013 ? diodes incorporated new product a h1898 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 sensor location suggested pad layout please see ap02001 at http://www.diodes.com/dat asheets/ap02001.pdf for the latest version. (1) package type: u-wlb0808-4 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 u-wlb0808-4 dimensions value c 0.40 d 0.172 all dimensions in mm d e a 2 a s e a t i n g p l a n e a 3 e e ? b x 4 p i n # 1 i d c c ? d 4 x http://www..net/ datasheet pdf - http://www..net/
AH1898 document number: ds36028 rev. 1 - 2 10 of 11 www.diodes.com february 2013 ? diodes incorporated new product a h1898 taping orientation package type: u-wlb0808-4 http://www..net/ datasheet pdf - http://www..net/
AH1898 document number: ds36028 rev. 1 - 2 11 of 11 www.diodes.com february 2013 ? diodes incorporated new product a h1898 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 proper ly 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 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 ? 2013, diodes incorporated www.diodes.com http://www..net/ datasheet pdf - http://www..net/

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