AH1891 miniature micropo wer omnipolar hall effect switch AH1891 document number: ds35207 rev. 1 - 2 1 of 7 www.diodes.com april 2011 ? diodes incorporated new product description the AH1891 is a miniature micropower omnipolar hall effect switch ic with dual outputs spec ifically designed for portable and battery powered equipment such as cellular phones and portable pcs. to support battery powered equipment the AH1891 has been optimized to operate over the supply range of 1.8v to 3.3v and uses a sleep function to give an average supply current of only 7ua. to minimize pcb space the AH1891 is packaged in the small csp package (0.8mmx0.8mm) and the design integrates the external pull up resistors to simplify the applications circuit. the outputs of the AH1891 are sw itched with either a north or south pole of sufficient strengt h. when the magnetic flux density (b) is larger than operate point (bop) , output 1 will pull low and output 2 will be inve rted (high). the output states are held until b is lower than release point (brp). the AH1891 is available in u-wlb0808-4 package. features ? omnipolar (north or south) operation ? low supply voltage of 1.8v to 3.3v ? micropower operation ? dual outputs for design flexibility ? internal pull up and pull down capability ? chopper stabilized design for: o superior temperature stability o superior temperature stability o superior temperature stability ? good rf noise immunity ? -40 c to 85 c operating temperature ? esd 4kv in human body mode ? miniature csp package 0.8mm x 0.8mm pin assignments a1 a2 b1 b2 (top view) a2 a1 b2 b1 (bottom view) applications ? cellular phones ? portable pcs and pdas ? digital cameras ? portable and battery powered applications typical application circuit AH1891 output 1 gnd output 2 vdd
AH1891 miniature micropo wer omnipolar hall effect switch AH1891 document number: ds35207 rev. 1 - 2 2 of 7 www.diodes.com april 2011 ? diodes incorporated new product pin descriptions pin # pin name description a1 out 1 output pin (active low) a2 out 2 output pin (active high) b1 gnd ground b2 vdd power supply voltage functional block diagram out2 gnd output controller latch latch power switch vdd hall plate amp offset cancelling hall plate amp offset cancelling out1 gnd vdd absolute maximum ratings (t a = 25 c) symbol parameter values unit vdd supply voltage 5 v b magnetic flux density unlimited t a operating temperature range -40 to +85 c ts storage temperature range -65 to +150 c p d package power dissipation 166 mw t j maximum junction temperature 150 c recommended operating conditions (t a = 25 c) symbol parameter conditions rating unit vdd supply voltage operating 1.8 to 3.3 v
AH1891 miniature micropo wer omnipolar hall effect switch AH1891 document number: ds35207 rev. 1 - 2 3 of 7 www.diodes.com april 2011 ? diodes incorporated new product electrical characteristics (t a = 25 c, vdd = 1.8v, unless otherwise specified) symbol parameter 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 ioff output leakage current output off - < 0.1 1 a 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 - 50 100 s tperiod period - 50 100 ms d.c. duty cycle - 0.1 - % magnetic characteristics (t a = 25 c, vdd = 1.8v~3.3v, note 1) (1mt=10 gauss) symbol paramete r (note 2) min typ. max unit bops(south pole to brand side) operate point 20 40 60 gauss bopn(north pole to brand side) -60 -40 -20 brps(south pole to brand side) release point 12 25 50 brpn(north pole to brand side) -50 -25 -12 bhy(|bopx|-|brpx|) hysteresis 15 notes: 1. typical data is at t a = 25 c, vdd = 3v, and for design information only. 2. operate point and release point will vary with supply voltage and operating temperature.
AH1891 miniature micropo wer omnipolar hall effect switch AH1891 document number: ds35207 rev. 1 - 2 4 of 7 www.diodes.com april 2011 ? diodes incorporated new product typical operating characteristics switch points bop and brp vs. temperature switch ? points ?? vs. ? temperature ? vdd ? = ? 1.8v \ 60 \ 40 \ 20 0 20 40 60 \ 55 \ 40 \ 25 \ 10 5 203550658095 temperature ? ( o c) gauss ? (g) bops brps bopn brpn bhy_s bhy_n switch ? points ?? vs. ? temperature ? vdd ? = ? 3.3v \ 60 \ 40 \ 20 0 20 40 60 \ 55 \ 40 \ 25 \ 10 5 203550658095 temperature ? ( o c) gauss ? (g) bops brps bopn brpn bhy_s bhy_n switch points bop and brp vs. supply voltage switch ? points ?? vs. ? supply ? voltage t a ? = ? 25 o c \ 60 \ 40 \ 20 0 20 40 60 1.5 1.8 2.1 2.4 2.7 3 3.3 supply ? voltage ? vdd ? (v) gauss ? (g) bops brps bopn brpn bhys_s bhys_n average supply current vs. temperature average supply current vs. supply voltage average ? supply ? current ?? vs. ? temperature vdd ? = ? 1.8v ? and ? 3.3v 0 5 10 15 20 25 30 35 40 \ 55 \ 40 \ 25 \ 10 5 203550658095 temperature ? ( o c) avg. ? supply ? current ? idd ? (ua) ?? ?? average ? supply ? current ?? vs. ? supply ? voltage t a ? = ? 25 o c 0 3 5 8 10 13 15 18 20 1.51.82.12.42.7 3 3.3 supply ? voltage ? vdd ? (v) avg. ? supply ? current ? idd ? (ua) idd(avg)
AH1891 miniature micropo wer omnipolar hall effect switch AH1891 document number: ds35207 rev. 1 - 2 5 of 7 www.diodes.com april 2011 ? diodes incorporated new product performance characteristics (1) u-wlb0808-4 t a ( c) 25 50 60 70 80 85 90 100 110 120 130 140 150 p d (mw) 166 132 120 105 93 86 79 66 53 39 26 13 0 power dissipation curve (AH1891-csp) 0 50 100 150 200 0 25 50 75 100 125 150 t a ( o c) p d (mw) 85 -40 ordering information AH1891 - ca4 - 7 packing package u-wlb0808-4 7 : tape & reel device (note 3) package code packaging (note 4) 7? tape and reel quantity part number suffix AH1891-ca4-7 ca4 u-wlb0808-4 3000/tape & reel -7 notes: 3. eu directive 2002/95/ec (rohs). all applicable rohs exemptions applied. please visit our website at http://www.diodes.c om/products/lead_free.html . 4. pad layout as shown on diodes inc. suggested pad lay out document ap02001, which can be found on our website at http://www.diodes.c om/datasheets/ap02001.pdf.
AH1891 miniature micropo wer omnipolar hall effect switch AH1891 document number: ds35207 rev. 1 - 2 6 of 7 www.diodes.com april 2011 ? diodes incorporated new product marking information (1) u-wlb0808-4 y : year : 0~9 x : a~z : internal code xx : identification code w : week : a~z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week a1 a2 y w x b1 b2 xx (top view) part number package identification code AH1891-ca4-7 u-wlb0808-4 a2 package outline dimensions (all dimensions in mm) (1) package type: u-wlb0808-4 0.400.020 0.400.020 0.3510.01 0.506ref. 0.1550.01 4 - ? 0 . 2 1 5 0 . 0 1 top mark 0.08 c 0.05 c c 0 . 0 5 m c a b b 0.800.040 0.800.040 hall sensor location pin id a 4x- 0.15 a 4x 0.40ref. 0.40ref. 0.400.020 0.400.020 land pattern recommendation (unit:mm) 4 x - ? 0 . 1 7 2 0 . 0 1 c l c l c l c l c l c l
AH1891 miniature micropo wer omnipolar hall effect switch AH1891 document number: ds35207 rev. 1 - 2 7 of 7 www.diodes.com april 2011 ? 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 ? 2011, diodes incorporated www.diodes.com
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