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AH1894 document number: ds35741 rev. 1 - 2 1 of 13 www.diodes.com july 2013 ? diodes incorporated new product a h1894 programmable high sensitivity micropower omnipolar hall-effect switch description the AH1894 is a high sensitiv ity micropower magnetic range selectable omnipolar hall effect switch ic with internal pull up and pull down capability. designed for portable and battery powered equipment such as cellular phones and portable pcs to home appliances and industrial app lications, 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 a hibernating clocking system to minimize the power consumption. to minimize pcb space the AH1894 is available in small low profile x1-dfn1216-4 and sot553 packages. 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). 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 ? high esd capability of 8kv (human body model) on v dd , 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) pin assignments (top view) x1-dfn1216-4 (top view) sot553 applications ? open and close detect for cellular phones ? holster or cover detect for cellular phones and tablet pcs ? cover or display switches in portable pcs ? 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 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. typical applications circuit note: 4. c in is for power stabilization and to strengthen the noise immunity, the recommended capa citance is 100nf typical.
AH1894 document number: ds35741 rev. 1 - 2 2 of 13 www.diodes.com july 2013 ? diodes incorporated new product a h1894 pin descriptions package: x1-dfn1216-4 pin number pin name function 1 output output pin 2 v dd power supply input 3 bsel band select 4 gnd ground pin package: sot553 pin number pin name function 1 v dd power supply input 2 nc no connection (note 5) 3 bsel band select 4 gnd ground 5 output output note: 5. nc is ?no connection? pin and is not connecte d internally. this pin can be left open or tied to ground. functional block diagram
AH1894 document number: ds35741 rev. 1 - 2 3 of 13 www.diodes.com july 2013 ? diodes incorporated new product a h1894 absolute maximum ratings (note 6) (@t a = +25c, unless otherwise specified.) symbol parameter rating unit v dd supply voltage (note 7) 6 v v dd_rev reverse supply voltage -0.3 v i output output current (source and sink) 3.5 ma b magnetic flux density unlimited p d package power dissipation x1-dfn1216-4 230 mw sot553 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 vdd, gnd and output pins 8 kv bsel pin 6 kv notes: 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 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 = 1.85v, 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 ioff output leakage current v out = 3.6v, output off - < 0.1 1 a v sel_lb bsel pin input voltage ? low band 0 ? 0.5 v v sel_hb bsel pin input voltage ? high band 1.4 ? 3.6 v r pd_bsel bsel pin internal pull-down resistor (note 8) ? 50 ? k ? 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 ? ma i dd (avg) average supply current t a = +25c, v dd = 1.85v ? 4.3 8 a t a = +25c, v dd = 3.6v ? 7.2 13 a tawake awake time (note 9) ? 50 100 s tperiod period (note 9) ? 50 100 ms d.c. duty cycle (note 10) ? 0.1 ? % notes: 8. bsel pin internal pull-down resistor is only active during awake time 9. 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). 10. transition time varies dependant on the timing of bsel activation during the sleep and awake phases.
AH1894 document number: ds35741 rev. 1 - 2 4 of 13 www.diodes.com july 2013 ? diodes incorporated new product a h1894 electrical characteristics (cont.) magnetic characteristics (note 11 &12) (t a = -40c to +85c, v dd = 1.85v, unless otherwise specified) (1mt=10 gauss) bsel symbol characteristics min typ max unit low bops lb (south pole to part marking side) low band - operation point 15 30 45 gauss low bopn lb (north pole to part marking side) -45 -30 -15 low brps lb (south pole to part marking side) low band - release point 10 20 35 low brpn lb (north pole to part marking side) -35 -20 -10 high bops hb (south pole to part marking side) high band - operation point 25 40 55 high bopn hb (north pole to part marking side) -55 -40 -25 high brps hb (south pole to part marking side) high band - release point 20 30 45 high brpn hb (north pole to part marking side) -45 -30 -20 ? bhy (|bopx|-|brpx|) hysteresis ? 10 ? notes: 11. typical data is at t a = +25 ? c, v dd = 1.85v. 12. maximum and minimum parameters values over the operating te mperature range are not tested in production, they are guarante ed by design, process control and characterization. the magnetic characteri stics may vary with supply voltage, operating temperature and after soldering. the AH1894 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 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 5 of 13 www.diodes.com july 2013 ? diodes incorporated new product a h1894 application notes applications circuit 1 ? low band leaving the bsel pin unconnected or connecting the bsel pin to ground permanently c onfigures the AH1894 into its high sensitivi ty mode (lower switching thresholds), requi ring a reduced magnetic flux density to activate its output (low band). applications circuit 2 ? high band connecting the bsel pin to v dd or applying a voltage greater than 1.4v configures th e 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 b e controlled by a micro- controller or a logic source. this allows the sensitivity to be changed within the application without a hardware change. whene ver 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 6 of 13 www.diodes.com july 2013 ? diodes incorporated new product a h1894 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 aw ake phase; this time is up to 100ms typical and 200.1ms ma ximum (tbc).
AH1894 document number: ds35741 rev. 1 - 2 7 of 13 www.diodes.com july 2013 ? diodes incorporated new product a h1894 typical operating characteristics typical switch points characteristics in low band (bsel = low) and high band (bsel = high) -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 = 1.60v, bsel = low (gnd) brpn bops bopn brps bhy -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 -50-250 255075100 gauss (g) temperature ( c) switch points vs temperature v dd = 1.60v, bsel = high (v dd ) 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 = 1.85v, bsel = low (gnd) brpn bops bopn brps bhy -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 -50-250 255075100 gauss (g) temperature ( c) switch points vs temperature v dd = 1.85v, bsel = high (v dd ) brpn bops bopn brps bhy -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 -50-250 255075100 gauss (g) temperature ( c) switch points vs temperature v dd = 3.0v, bsel = 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 = 3.0v, bsel = high (v dd ) brpn bops bopn brps bhy
AH1894 document number: ds35741 rev. 1 - 2 8 of 13 www.diodes.com july 2013 ? diodes incorporated new product a h1894 typical operating characteristics (cont.) typical switch points characteristics in low band (bsel = low) and high band (bsel = high) average supply current i dd (avg) -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 = 3.60v, bsel = low (gnd) brpn bops bopn brps bhy -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 -50-250 255075100 gauss (g) temperature ( c) switch points vs temperature v dd = 3.60v, bsel = high (v dd ) 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 3.6v 1.6v 1.85v v dd = 1.60v to 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 average supply current i dd ( a) supply voltage (v) average supply current vs. supply voltage t a = +25 c brpn bops bhy bopn brps
AH1894 document number: ds35741 rev. 1 - 2 9 of 13 www.diodes.com july 2013 ? diodes incorporated new product a h1894 ordering information part number package code packaging 7? tape and reel quantity part number suffix AH1894-fa-7 fa x1-dfn1216-4 3000/tape & reel -7 AH1894-z-7 z sot553 3000/tape & reel -7 marking information (1) package type: x1-dfn1216-4 part number package identification code AH1894-fa-7 x1-dfn1216-4 b4 (2) package type: sot553 part number package identification code AH1894-z-7 sot553 b4
AH1894 document number: ds35741 rev. 1 - 2 10 of 13 www.diodes.com july 2013 ? diodes incorporated new product a h1894 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 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 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
AH1894 document number: ds35741 rev. 1 - 2 11 of 13 www.diodes.com july 2013 ? diodes incorporated new product a h1894 package outline dimensions (cont.) (all dimensions in mm.) (2) package type: sot553 sensor location 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 e1/2 e1 d typ. r0.1 max. a a e/2 e b (5x) e e1 l (5x) c f 7 typ.
AH1894 document number: ds35741 rev. 1 - 2 12 of 13 www.diodes.com july 2013 ? diodes incorporated new product a h1894 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 (2) package type: sot553 x1-dfn1216-4 dimensions value c 0.65 x 0.25 x1 0.90 y 0.50 y1 0.70 y2 2.00 all dimensions in mm 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 x 1 y 2 y 1 y c x x z y c1 c2 c2 g
AH1894 document number: ds35741 rev. 1 - 2 13 of 13 www.diodes.com july 2013 ? diodes incorporated new product a h1894 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 arising 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 whatsoever 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

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