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ah1892 programmable micro power omnipolar hall-effect sensor switch ah1892 document number: ds35092 rev. 1 - 2 1 of 11 www.diodes.com may 2012 ? diodes incorporated new product description the ah1892 is a micropower magnetic range selectable (bop/brp) omnipolar hall effect switch ic with internal pull up and pull down capability, designed for consumer equipment ranging from portable and battery powered cellular phones and portable pcs to home appliances and industrial applicati ons. to support battery powered equipment and low voltage microcontrollers, the ah1892 can operate over the supply range of 1.6v to 3.6v and uses a hibernating clocking system to minimize the power consumption. the average supply current is only 4.3a typical at 1.80v. due to the application diversity, the ah1892 has an 8kv esd rating on the supply and output pins. to minimize pcb space the ah1892 is packaged in the small csp package (0.71mm x 0.71mm) or sot553 leaded package 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 wi thout 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 ? superior temperature stability ? extremely low switch-point drift ? insensitive to physical stress ? no external pull up resistors required ? good rf noise immunity ? -40 c to +85 c operating temperature ? 8kv esd on supply and output pins ? miniature u-wlb07070-4 (csp 0.71mm x 0.71mm typical) and small low profile sot553 ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) pin assignments u-wlb0707-4 sot553 applications ? open and close detect for gaming and cellular phones ? holster and dock detect for cellular phones ? cover switch in portable and tablet pcs ? digital still and video cameras ? tray, door and covers position detect for printers and scanners ? contact-less switch in cons umer and industrial products 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.
ah1892 programmable micro power omnipolar hall-effect sensor switch ah1892 document number: ds35092 rev. 1 - 2 2 of 11 www.diodes.com may 2012 ? diodes incorporated new product typical application circuit note : c in is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nf typical pin descriptions package: u-wlb0707-4 pin # pin name description a1 gnd ground a2 output output b1 bsel band select b2 v dd power supply voltage package: sot553 pin # pin name description 1 v dd power supply voltage 2 nc no connection (note 4) 3 bsel band select 4 gnd ground 5 output output notes: 4. nc is ?no connection? pin and is not connected in ternally. this pin can be left open or connected to ground. functional block diagram
ah1892 programmable micro power omnipolar hall-effect sensor switch ah1892 document number: ds35092 rev. 1 - 2 3 of 11 www.diodes.com may 2012 ? diodes incorporated new product absolute maximum ratings (t a = +25 c, note 5) s y mbol characteristics v alues 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 ts storage temperature range -65 to +150 c p d package power dissipation u-wlb0707-4 160 mw sot553 230 mw t j maximum junction temperature 150 c esd human body model esd v dd , gnd and out pins 8 kv bsel pin 6 kv notes: 5. stresses greater than the 'absolute maximum ratings' sp ecified above, may cause permane nt 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 absolu te 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 symbol characteristics conditions rating unit v dd supply voltage operating 1.6 to 3.6 v t a operating temperature range operating -40 to +85 c electrical characteristics (t a = +25 c, v dd = 1.8v, unless otherwise specified.) symbol characteristics 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 blsel band select low band 0 0.5 v bhsel band select high band 1.4 3.6 v r u_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 a i dd (avg) average cupply current v dd = 1.8v 4.3 8.0 a i dd (avg) v dd = 3.6v 7.2 13.0 a tawake awake active pulse width (note 8) 50 100 s tperiod awake period (note 8) 50 100 ms d.c. duty cycle 0.1 % tband 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 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.
ah1892 programmable micro power omnipolar hall-effect sensor switch ah1892 document number: ds35092 rev. 1 - 2 4 of 11 www.diodes.com may 2012 ? diodes incorporated new product electrical characteristics (cont.) i dd (sleep) i dd (awake) tawake tperiod 0 sample and output latched tsleep magnetic characteristics (t a = +25 c, v dd = 1.6v to 3.6v, note 10) (1mt=10 gauss) bsel symbol characteristics min typ max unit low bops lb (south pole to brand side) low band - operation point 18 35 55 gauss low bopn lb (north pole to brand side) -55 -35 -18 low brps lb (south pole to brand side) low band - release point 12 25 45 low brpn lb (north pole to brand side) -45 -25 -12 high bops hb (south pole to brand side) high band - operation point 43 60 80 high bopn hb (north pole to brand side) -80 -60 -43 high brps hb (south pole to brand side) high band - release point 35 50 70 high brpn hb (north pole to brand side) -70 -50 -35 - bhy (|bopx|-|brpx|) hysteresis - 10 - notes: 10. magnetic characteristics may vary with operating temperature and after soldering. the ah1892 includes a band select pin (bsel) so that the operate (bops and bopn) and release (brps and brpn) points can be adju sted between two pre-defined ranges. the bsel can be hard wired within the application circuit or the band can be selected on the fl y by using the bsel pin as a logic input. this feature allows the ah1892 s ensitivity to be changed by firmware within the application with out the addition of any external components. if the bsel pin is left open circuit the ah1892 defaults to high band.
ah1892 programmable micro power omnipolar hall-effect sensor switch ah1892 document number: ds35092 rev. 1 - 2 5 of 11 www.diodes.com may 2012 ? diodes incorporated new product application note applications circuit one ? low band connecting the bsel pin to ground permanently configures the ah 1892 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 vdd or to a voltage greater than 1.4v or leaving the bsel pin uncon nected configures the ah1892 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 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, t he band selection changeover should be allowed to complete for the output to be valid.
ah1892 programmable micro power omnipolar hall-effect sensor switch ah1892 document number: ds35092 rev. 1 - 2 6 of 11 www.diodes.com may 2012 ? diodes incorporated new product application note (cont.) bands select change timing and valid output whenever band selection bsel pin input is changed, allow for ban d 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 phase; this time can range from 100ms typical and 200.1ms maximum.
ah1892 programmable micro power omnipolar hall-effect sensor switch ah1892 document number: ds35092 rev. 1 - 2 7 of 11 www.diodes.com may 2012 ? diodes incorporated new product typical operating characteristics typical switch points characterisitics in low band (bsel = low) and high band (bsel = high) average supply current i dd (avg) -50-250 255075100 temperature (c) switch points vs. temperature 70 50 40 10 0 -10 -20 -30 -40 -50 -70 g a uss (g) -60 20 30 60 bops brps bhys brpn bopn v = 1.80v, bsel = low (gnd) dd -50-250 255075100 temperature (c) switch points vs. temperature 70 50 40 10 0 -10 -20 -30 -40 -50 -70 g a u ss ( g ) -60 20 30 60 bops brps bhys brpn bopn v = 1.80v, bsel = high (v ) dd dd 1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6 supply voltage (v) switch points vs. supply voltage 70 50 40 10 0 -10 -20 -30 -40 -50 -70 g a u ss ( g ) -60 20 30 60 1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6 supply voltage (v) switch points vs. supply voltage 70 50 40 10 0 -10 -20 -30 -40 -50 -70 g a u ss ( g ) -60 20 30 60 bops brps bhys brpn bopn t = +25c, bsel = high (v ) a dd -50 -25 0 25 50 75 100 temperature (c) average supply current vs. temperature 10 9 8 7 6 5 4 3 2 1 0 ave r a g e s u p p l y c u r r e n t , i (avg)d (a) dd v = 1.8v and 3.6v dd 3.6v 1.8v 1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6 supply voltage (v) average supply current vs. supply voltage 10 9 8 7 6 5 4 3 2 1 0 ave r a g e s u p p l y c u r r e n t , i (avg) (a) dd t = +25c a
ah1892 programmable micro power omnipolar hall-effect sensor switch ah1892 document number: ds35092 rev. 1 - 2 8 of 11 www.diodes.com may 2012 ? diodes incorporated new product ordering information device package code packaging (note 11) 7? tape and reel quantity part number suffix AH1892-CD4-7 cd4 u-wlb0707-4 3000/tape & reel -7 ah1892-z-7 z sot553 3000/tape & reel -7 notes: 11. pad layout as shown on diodes inc. suggested pad la yout document ap02001, which can be found on our website at http:// www.diodes.com/dat asheets/ap02001.pdf. marking information (1) package type: u-wlb0707-4 part number package identification code AH1892-CD4-7 u-wlb0707-4 b2 (2) package type: sot553 part number package identification code ah1892-z-7 sot553 b2
ah1892 programmable micro power omnipolar hall-effect sensor switch ah1892 document number: ds35092 rev. 1 - 2 9 of 11 www.diodes.com may 2012 ? diodes incorporated new product package outline dimensions (all dimensions in mm) (1) package type: u-wlb0707-4
ah1892 programmable micro power omnipolar hall-effect sensor switch ah1892 document number: ds35092 rev. 1 - 2 10 of 11 www.diodes.com may 2012 ? diodes incorporated new product package outline dimensions (cont.) (2) package type: sot553 1.0typ. 0.15/0.30(5x) 0.30 c 0.10 m c a-b d b 1.10/1.25 c l c l 1.55/1.70 d 0.30 c d 6 ~ 8 0.10/0.18 0.55/0.62 1.50/1.70 0.30 c d a 6 ~ 8 6 ~ 8 top view 1.2 5x-0.5 land pattern recommendation (unit:mm) 1.0typ. 1.7 2.2 pin1 pin1 0.1 c l c l 0.5typ. 0.5typ. 0.3 0.45/0.67 hall sensor die 0.300.08
ah1892 programmable micro power omnipolar hall-effect sensor switch ah1892 document number: ds35092 rev. 1 - 2 11 of 11 www.diodes.com may 2012 ? diodes incorporated new product 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 reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products desc ribed herein in such applications 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 incorporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized a pplication. 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. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems 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 properly 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 device or system whose failure to perform can be reasonably expected 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 ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety-critical, life support devices or systems. copyright ? 2012, diodes incorporated www.diodes.com

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