Monolithic Hall Effect ICs AK-series AK8788 Shipped in packet-tape reel(5000pcs/Reel) AK8788 is ultra-small Hall effect IC of a single silicon chip composed of Hall element and a signal processing IC. Omnipolar Hall Supply Voltage Effect Switch 1.6〜5.5Ｖ Hall Element Pulse Excitation High Sensitivity Output Bop：3mT CMOS SON ●Features ・High sensitive omnipoler operation ・Micropower operation Typ.4.5μA (average : VDD=1.85V) ・Ultra small SON package : 1.1×1.4×t0.37mm Halogen free ●Operational Characteristics Vout VOH S or N H Package top BhN Package bottom N or S BhS VOL N L BopN BrpN 0 BrpS BopS S Magnetic flux density ●Functional Block Diagram 1：VDD Item Function Switch Dynamic Offset Cancellation OSC 4：OUT Generates operating clock Timing logic Generates timing signal requires for Chopper SW, AMP and COMP Hall Element Hall element fabricated by CMOS process Chopper SW Performs chopping in order to cancel the offset voltage of Hall sensor OSC Hall Chopper & Element SW Timing Logic 23 AMP Schmitt Trigger & Latch Output Stage 2：VSS AMP Reduce offset voltage and amplifies Hall output voltage Schmitt Trigger Hysteresis comparator Output Stage CMOS output, During the power down mode, output is latched in its previous state AK8788 •Please be aware that our products are not intended for use in life support equipment, devices, or systems. Use of our products in such applications requires the advance written approval of our sales staff. Certain applications using semiconductor devices may involve potential risks of personal injury, property damage, or loss of life. In order to minimize these risks, adequate design and operating safeguards should be provided by the customer to minimize inherent or procedural hazards. Inclusion of our products in such applications is understood to be fully at the risk of the customer using our devices or systems. b ●Absolute Maximum Ratings symbol Min. Max. Power supply voltage VDD ー0.3 ＋6.5 V Output current IOUT ー0.5 ＋0.5 mA Storage temperature TSTG ー55 ＋125 ℃ Item Unit Note) Stresses beyond these listed values may cause permanent damage to the device. ●Recommended Operating Conditions Item symbol Min. Typ. Power supply voltage Operating temperature VDD 1.6 1.85 Ta ー30 Max. Unit 5.5 V ＋85 ℃ f ●Electrical Characteristics①（Ta=25℃ VDD=1.85V Unless otherwise noted） Item Current consumption Min. symbol Typ. Max. Unit Note IDD 4.5 9 μA Average IDD2 7.5 12 μA Average, VDD=5.5V High level output voltage VOH Low level output voltage VOL Pulse drive period TPD1 25 50 100 ms Pulse drive time TPD2 43 85.4 170 μs VDDー0.4 0.4 V Iout=ー0.5mA V Iout=＋0.5mA ●Electrical Characteristics②（Ta=−30℃〜85℃ VDD=1.6〜5.5V） Item Min. symbol Current consumption IDD High level output voltage VOH Low level output voltage VOL Pulse drive period TPD1 25 Pulse drive time TPD2 43 Typ. Max. Unit 4.5 15 μA VDDー0.4 Note V Iout=ー0.5mA 0.4 V Iout=＋0.5mA 50 100 ms 85.4 170 μs k Note) The specifications in Electrical Characteristics ② are design targets. ●Magnetic Characteristics①（Ta=25℃ VDD=1.85V） Item Operating points Releasing points Hysteresis symbol Min. Typ. Max. Unit BopS ＊1.4 3.0 4.0 mT mT BopN ー4.0 ー3.0 ＊ー1.4 BrpS 1.1 2.2 ＊3.7 mT BrpN ＊ー3.7 ー2.2 ー1.1 mT BhS,BhN ＊0.3 0.8 ＊1.5 mT n o Note) The characteristics with * mark are design targets. ●Magnetic Characteristics②（Ta=−30℃〜85℃ VDD=1.6〜5.5V） Item Operating points Releasing points Hysteresis symbol Min. Typ. Max. Unit BopS 1.2 3.0 4.4 mT BopN ー4.4 ー3.0 ー1.2 mT BrpS 0.9 2.2 4.1 mT BrpN ー4.1 ー2.2 ー0.9 mT BhS,BhN 0.1 0.8 1.7 mT Note) The specifications in Magnetic Characteristics ② are design targets. p 24 AK8788 ●Package（Unit:mm) ●Footprint（for reference) 0.80 Pin No. Pin name 1 VDD 2 VSS 3 N.C. 4 OUT 0.22 ! 0.22±0.05 1.70 Function Note Power supply pin Ground pin （No internal connection） Connect to VSS externally Output pin CMOS output ●IDD Timing Chart ●Functional Timing Chart IDD IDD 0.50±0.05 ※Note 1) Sensitive area position referenced to the center of package within φ0.3mm circle. Note 2) Tolerances of dimension otherwise noted is ±0.05mm. Note 3) Hatched area is plated. Note 4) Center pad area (TAB) should be tied to the VSS or floating (0.23) (0.125) 0.37 Sensor Center 0.60 1.40 ! 1.00 0.35±0.10 " 0.80 1.40 " 0.50 0.60 0.20 1.10 IDD 50ms（typ.） 85.4μs（typ.） IDD ON （typ : 1.7mA） time B Bop IDD （typ : 4.5μA） IDD OFF （typ : 1.3μA） Vout High time time B Brp time 12.2μs（typ.） Low Vout High time 12.2μs（typ.） Low time Operating Point Timing time Releasing Point Timing Note: Hall IC s output is held as internal data just before the internal circuit turns off. And after 12.2μs (typ.)the output changes. 25 AK8788 ●Typical Characteristics Data (for reference) b 6 BopS BopN V DD =1.85V V DD =3V V DD =5.5V 9 8 7 2 IDD［μA］ Bop, Brp［mT］ 4 10 BrpS BrpN 0 -2 6 5 4 3 2 -4 1 -6 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 0 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Ambient Temperature Ta［℃］ Bop, Brp vs. Ta(VDD=1.85V) Ambient Temperature Ta［℃］ IDD vs. Ta Temperature dependence of sensitivity Temperature dependence of current consumption（Average） f ●Application Circuit VDD=1.85V CMOS Output VDD 100nF OUT AK8788 VSS N.C. GND k n o p 26 IMPORTANT NOTICE These products and their specifications are subject to change without notice. When you consider any use or application of these products, please make inquiries the sales office of Asahi Kasei Microdevices Corporation (AKM) or authorized distributors as to current status of the products. Descriptions of external circuits, application circuits, software and other related information contained in this document are provided only to illustrate the operation and application examples of the semiconductor products. You are fully responsible for the incorporation of these external circuits, application circuits, software and other related information in the design of your equipments. AKM assumes no responsibility for any losses incurred by you or third parties arising from the use of these information herein. AKM assumes no liability for infringement of any patent, intellectual property, or other rights in the application or use of such information contained herein. Any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. AKM products are neither intended nor authorized for use as critical componentsNote1) in any safety, life support, or other hazard related device or systemNote2), and AKM assumes no responsibility for such use, except for the use approved with the express written consent by Representative Director of AKM. As used here: Note1) A critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. Note2) A hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. It is the responsibility of the buyer or distributor of AKM products, who distributes, disposes of, or otherwise places the product with a third party, to notify such third party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold AKM harmless from any and all claims arising from the use of said product in the absence of such notification. April 4, 2012