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ah1888 micropower, general-s ensitive hall effect switch ah1888 document number: ds31565 rev. 7 - 2 1 of 11 www.diodes.com may 2011 ? diodes incorporated description the ah1888 micro power omni-polar hall effect switch ic designed for portable and battery powered equipment such as cellular phones, pda? s and portable pc? s. based on two sensitive hall effect pl ates and chopper stabilized architecture the ah1888 provides a reliable solution over the whole operating range. to support portable and battery powered equipment the design has been optimized to operate over the supply rang e of 1.65v to 3.3v and consumes only 12.6uw with a supply of 1.8v. the outputs are switched with eith er a north or south pole of sufficient strength. when the magnetic flux density (b) is larger than operate point (bop) the output is switched on. the output is turned off when b becomes lower than the release point (brp). the output will remain off when there is no magnetic field. the ah1888-zg has two outputs, output one pulls low when switched on and output two is inverted. the ah1888-fjg provides output one and ah1888-fjrg provides output two. features ? omni-polar (north or south pole) operation ? single or dual output options ? internal output pull up capability ? micropower operation ? 1.65v to 3.3v operating range ? chopper stabilized design provides ? superior temperature stability ? minimal switch point drift ? enhanced immunity to stress ? good rf noise immunity ? -40c to 85c operating temperature ? esd (hbm) 4kv for sot553 ? esd (hbm) 5kv for dfn2020-3 and dfn2020r-3 ? package: sot553, dfn2020-3 and dfn2020r-3 ? ?green? molding compound pin assignments 5 4 3 2 1 gnd output1 nc output 2 vdd ( top view ) sot553 1. vdd 2. output 1 3. gnd ( top view ) dfn2020-3 1. vdd 2. output 2 3. gnd ( top view ) dfn2020r-3 applications ? cellular phone ? portable pc and pdas ? camcorders ? cordless phone ? contactless switch in consumer products
ah1888 micropower, general-s ensitive hall effect switch ah1888 document number: ds31565 rev. 7 - 2 2 of 11 www.diodes.com may 2011 ? diodes incorporated typical application circuit (1) sot553 (2) dfn2020-3 (3) dfn2020r-3 ah1888 vdd output 1 gnd output 2 ah1888 vdd output 1 gnd ah1888 vdd output 2 gnd pin descriptions pin name p/i/o description vdd p/i power supply voltage gnd p/i ground output 1 o output pin ( active low ) output 2 o output pin ( active high )
ah1888 micropower, general-s ensitive hall effect switch ah1888 document number: ds31565 rev. 7 - 2 3 of 11 www.diodes.com may 2011 ? diodes incorporated functional block diagram (1) sot553 output driver controller latch latch sleep/awake logic and power switch vdd hall plate amp hall plate amp output 2 gnd offset cancellation offset cancellation output 1 gnd vdd (2) dfn2020-3 output driver controller latch latch sleep/awake logic and power switch vdd hall plate amp hall plate amp output 1 offset cancellation offset cancellation gnd (3) dfn2020r-3 output driver controller latch latch sleep/awake logic and power switch vdd hall plate amp hall plate amp output 2 offset cancellation offset cancellation gnd
ah1888 micropower, general-s ensitive hall effect switch ah1888 document number: ds31565 rev. 7 - 2 4 of 11 www.diodes.com may 2011 ? diodes incorporated absolute maximum ratings (t a = 25 c) symbol characteristics values unit vdd supply voltage 5 v b magnetic flux density unlimited ts storage temperature range -65 to +150 c p d package power dissipation 230 mw t j maximum junction temperature 150 c recommended operating conditions (t a = 25 c) symbol characteristic conditions rating unit vdd supply voltage operating 1.65 to 3.3 v t a operating temperature rang e operating -40 to +85 c electrical characteristics (t a = 25 c, vdd = 1.8v, unless otherwise specified) symbol characteristic conditions min typ. max unit v oh output on voltage (high side) i o = -0.5ma vdd-0.2 - - v v ol output on voltage (low side) i o = 0.5ma - - 0.2 v idd(en) supply current chip enable - 2 4 ma idd(dis) chip disable - 5 8 ua idd(avg) average supply current - 7 12 ua tawake awake time (note 1) - 50 100 s tperiod period (note 1) - 50 100 ms d.c. duty cycle - 0.1 - % notes: 1. when power is initially turned on, vdd must be with in its correct operating range (1.65v to 3.3v) to guarantee the output sampling. the output state is valid after the second operating cycle (typical 100ms).
ah1888 micropower, general-s ensitive hall effect switch ah1888 document number: ds31565 rev. 7 - 2 5 of 11 www.diodes.com may 2011 ? diodes incorporated magnetic characteristics (t a = 25 c, vdd = 1.8v~3.0v, note 2 & 3) (1mt=10 gauss) symbol characteristic min typ. max unit bops(south pole to brand side) operate point - 61 79 gauss bopn(north pole to brand side) -79 -61 - brps(south pole to brand side) release point 35 53 - brpn(north pole to brand side) - -53 -35 bhy( brpx bopx ? ) hysteresis 3 8 - notes: 2. typical data is at vdd = 3v. 3. the magnetic characteristics may vary with su pply voltage, operating temperature and after soldering. b hy v sat v dd (outputvoltage) b opn b rpn 0 ( magnetic flux density b ) turn on turn off ( off-state ) ( on-state ) b hy v sat v dd (outputvoltage) b rps b ops 0 ( magnetic flux density b ) turn off turn on ( off-state ) ( on-state ) n ns s output 1 ( active low ) output 1 ( active low ) b hy v sat v dd ( output voltage ) b opn b rpn 0 ( magnetic flux density b ) turn on turn off ( off-state ) ( on-state ) b hy v sat v dd ( output voltage ) b rps b ops 0 ( magnetic flux density b ) turn off turn on ( off-state ) ( on-state ) n ns s output 2 ( active high ) output 2 ( active high )
ah1888 micropower, general-s ensitive hall effect switch ah1888 document number: ds31565 rev. 7 - 2 6 of 11 www.diodes.com may 2011 ? diodes incorporated typical characteristics sw itch points vs tem perature vdd = 2.8v brps bops bopn brpn -80 -60 -40 -20 0 20 40 60 80 -50 -25 0 25 50 75 100 temperature ( ) switch point (gauss) sw itch points vs supply voltage t a = 25 bops brps bopn brpn -80 -60 -40 -20 0 20 40 60 80 1.5 2.0 2.5 3.0 3.5 vdd (v) switch point (gauss) performance characteristics for sot553, dfn2020-3 and dfn3030r-3 t a ( c) 25 50 60 70 80 85 90 100 110 120 130 140 150 p d (mw) 230 184 166 147 129 120 110 92 74 55 37 18 0 power dissipation curve 0 100 200 300 0 25 50 75 100 125 150 t a ( o c) p d (m w ) 85 -40
ah1888 micropower, general-s ensitive hall effect switch ah1888 document number: ds31565 rev. 7 - 2 7 of 11 www.diodes.com may 2011 ? diodes incorporated ordering information ah 1888 - xxx g - 7 packing package green z : sot553 g : green 7 : tape & reel fj : dfn2020-3 fjr : dfn2020r-3 device package code packaging (note 4 & 5) 7? tape and reel quantity part number suffix AH1888-ZG-7 z sot553 3000/tape & reel -7 ah1888-fjg-7 fj dfn2020-3 3000/tape & reel -7 ah1888-fjrg-7 fjr dfn2020r-3 3000/tape & reel -7 notes: 4. eu directive 2002/95/ec (rohs). all applicab le rohs exemptions applied. please visit our website at http://www.diodes.com /products/lead_free.html . 5. pad layout as shown on diodes inc. suggested pad layout document ap02001, which can be found on our website at ht tp://www.diodes.com/d atasheets/ap02001.pdf.
ah1888 micropower, general-s ensitive hall effect switch ah1888 document number: ds31565 rev. 7 - 2 8 of 11 www.diodes.com may 2011 ? diodes incorporated marking information (1) sot553 ( top view ) y : year : 0~9 x : a~z : green xx : identification code w : week : a~z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week xx y w x part number package identification code ah1888 sot553 kv (2) dfn2020-3 and dfn2020r-3 ( top view ) xx pin 1 indicator y : year : 0~9 x : a~z : green xx : identification code w : week : a~z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week y w x part number package identification code ah1888 dfn2020-3 kv ah1888 dfn2020r-3 kw
ah1888 micropower, general-s ensitive hall effect switch ah1888 document number: ds31565 rev. 7 - 2 9 of 11 www.diodes.com may 2011 ? diodes incorporated package outline dimensions (all dimensions in mm) (1) package type: sot553 1.0typ. 0.15/0.30(5x) 0.3 0 c 0.10 m c a-b d b cl d 0. 30 c d 0.10/0.18 1.50/1.70 0.30 c d a top view 1.2 land pattern recommendation (unit:mm) 1.0typ. 1. 7 2. 2 pin1 pin1 0.1 0.5typ. 0.5typ. 0.3 0.32/0.58 hall sensor 0.3 0.07 die =package center location line 5x-0.5 1.10/1.25 1.55/1.70 0.45/0.67 cl cl cl 0.55/0.62 6 ~ 8 6 ~ 8 6 ~ 8 cl (2) package type: dfn2020-3 and dfn2020r-3 1 0.6 0.4 0.45 1.1 0. 15 r 0 . 2 2 5 0.322 0.45 0.48 1.4 r 0 . 2 0.35 0.689 0.45 r 0 . 2 1.1/1.3 0.325ref. b 0.25 b 2x- 0.10 m c a b 0.35/0.45 0/0.05 0.57/ 0.63 0.10 c 0.08 c 1.95/2.075 a 0.25 a 2x c seating plane bottom view 1.95/2. 075 sensor location land pattern recommendation (unit:mm) top view 0. 74 1.03 0.8/1.0 top view die 0.18 0.07 pin1 pin1 = package center location line 2.3 1 cl 0.2/0.3 cl cl cl cl cl cl 0.152 typ 0.138 ref
ah1888 micropower, general-s ensitive hall effect switch ah1888 document number: ds31565 rev. 7 - 2 10 of 11 www.diodes.com may 2011 ? diodes incorporated taping orientation (note 6) for dfn2020-3 and dfn2020r-3 notes: 6. the taping orientation of the other package type can be found on our website at http://www.diodes .com/datasheets/a p02007.pdf.
ah1888 micropower, general-s ensitive hall effect switch ah1888 document number: ds31565 rev. 7 - 2 11 of 11 www.diodes.com may 2011 ? diodes incorporated 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 ? 2011, diodes incorporated www.diodes.com

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