[EM3242] EM3242 Angle Sensor IC Applications □ □ □ □ Small absolute rotary encoder Small input device (mode selector, volume control, and soon) Potentiometer Rotary switch □ □ □ □ □ □ □ □ Features Si monolithic rotary position sensor IC with embedded Hall devices Contactless rotary position sensor is easily implemented with magnetic disc (radial magnetic) and sensor IC. Analog ratiometric output (10%VDD～90%VDD) 10 bit Angular Resolution 3V single power supply Extremely small temperature drift (typ. +/-1.0 degree) Ambient operating temperature range: Ta=-40 to 150ºC Package: SOP6 body size 3.6×3.0×0.95mm Block Diagram VDD VSS HE X Angle detection HE Preamp 10bit DAC (Mixed signal AOUT processing circuit) HE Buffer Y HE Sine wave ROM TSTA <EM3242 PDN TSTB Datasheet V1.2> －1－ April, 2013 [EM3242] Functional Blocks Block name Function Hall Elements. These detect X/Y-compositions of flux which is parallel to the IC package surface by using magnetic concentrator. This is able to amplify signals from Hall elements. HE PreAmp Angle Detection & Sine Wave ROM DAC Angle Detection makes digital angle data from signals from Hall Elements using Sine Wave ROM. Digital to analog converter for angle output. PIN Description No. Symbol I/O Type 1 TSTB I/O Analog/Digital 2 VSS - Power 3 PDN I Analog 4 AOUT O Analog 5 VDD - Power 6 TSTA I/O Analog Function TEST dedicated PIN, which should be connected to the GND in use. Ground PIN. Power down PIN. IC is active in the case that PDN is High. IC is power down in the case that PDN is Low. Analog output PIN for angle data. CL: max.200pF（pull-down） Power Supply PIN. 0.1uF Ceramic Capacitor is required between Vss for stabilization. If Capacitor has magnetism, separate it around 10mm from IC. TEST dedicated PIN, which should be connected to the GND in use. Application Circuit Power Down Input Analog Voltage Output 4:AOUT PDN:3 Power Supply Analog Voltage Output VDD(2.7V-3.3V) 5:VDD VSS:2 0.1F 6:TSTA TSTB:1 Locate close to IC *Bypass capacitor must be inserted between VDD and VSS. <EM3242 Datasheet V1.2> －2－ April, 2013 [EM3242] Absolute Maximum Ratings Parameter Symbol Supply Voltage Input Voltage VDD VIN Min. -0.3 - Max. 6.5 VDD+0.3 Unit V V Storage Temperature Range Tstg -50 +125 C 備考 PDN terminal Operating Conditions Parameter Symbol Supply Voltage Vdd Min. 2.7 Typ. 3.0 Max. 3.3 Unit V Operating Temperature Range Ta -30 - +85 C Notes Electrical & Magnetic Specifications Condition is; Ta=25C, VDD=3.3V if particular notes are not defined. Parameter Symbol Min. Typ. Max. Magnetic Flux BRANGE 20 30 40 Density Range Angle Detection Range Angle Resolution Angle error Linearity ARANGE ARES APREC INL mT 360 Deg. 3.0 0.84 Deg. Deg. %FS 0.36 -3.0 -0.84 Unit @-30～85C *2 10Bit @25C *5 *8 FS=360° *5 @-30～85C (Reference)*1*6 Angle temperature drift ATD +/-1.0 Angle output cycle Signal delay time Tp Td 40 140 180 μs μs Minimum Output Voltage VOUT(min) 0.095VDD 0.1VDD 0.105VDD V Maximum Output Voltage VOUT(max) 0.895VDD 0.9VDD 0.905VDD V 8 12 mA PDN：H *7 1 μA PDN：L *7 850 0.3 μs mA PDN：L→H *2 *2 Consumption Current While driving Sensor Consumption Current While Power Down Startup time Output Current ISUP IPD TPD IOUT 680 -0.3 Deg. Notes A/D Conversion Cycle *2 *2 @Angle 0° Ratiometric Load Condition *3 @Angle 359.64° Ratiometric Load Condition *4 *1) Based on Ambient Temperature = 25C *2) This is a design assurance parameter. And this parameter will not be inspected in mass production. *3) AOUT Maximum Load Condition is CL=200pF (pull-down), AOUT Load Condition in Vout (min.) test: RL=9kΩ (pull-up), CL＝ 200pF (pull-down) *4) AOUT Maximum Load Condition is CL=200pF (pull-down), AOUT Load Condition in Vout (max.) test: RL=9kΩ (pull-down), CL＝200pF (pull-down) <EM3242 Datasheet V1.2> －3－ April, 2013 [EM3242] *5) Angle error Angle Error is defined as below formula. Angle Error [°]＝360°×Maximum Perpendicular Deviation/( Vout (max)- Vout (min)) Linearity is defined as below formula. Linearity [%FS.]＝Maximum Perpendicular Deviation /( Vout (max)- Vout (min)) ×100 [%FS.] Vout (max.) Output Voltage Base Line Maximum Perpendicular Deviation Vout (min.) 0° 360° Rotation Angle *6) Angle temperature drift Vout temperature drift means temperature drift of output voltage at the same rotation angle. Angle temperature drift is defined as below formula. Angle temperature drift [°]＝360°×Vout temperature drift/( Vout (max)- Vout (min)) Vout (max.) Output Voltage Ta=T1 Ta=25C Vout temperature drift Base Line Vout (min.) Base Line 0° 360° Rotation Angle *7) No Load <EM3242 Datasheet V1.2> －4－ April, 2013 [EM3242] *8) Reference (Angle Error) <Measurement conditions> 1. Magnet: φ7.0×t2.0mm (Neodymium magnet: Br=1250mT) 2. Distance between the magnet and the package: Gap=4.0mm (This Gap is the distance where the magnetic flux density at the sensor becomes 30mT) 3. Rotation angle of magnet: 0 to 360° (step: 1deg.) 4. Power Supply: Vdd=3.3V 5. Bypass Capacitor: C=0.1μF （Distance from IC to Bypass Capacitor: d=15mm） 8 N=36pcs <Angle Error> Ave.=0.87° σ=0.22° 7 N [pcs] 6 5 4 3 2 1 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Angle Error [° ] In this measurement conditions, Maximum of Angle Error (Ave.+5σ) is smaller than +/-2 Startup time Power Supply PDN AOUT Unstable Angle Voltage MAX 850 s 1) Please be noted that there is a certain period that the angle output voltage is unstable when EM-3242 goes to the operation from power down (PDN) mode, as shown above. 2) “Power Up Voltage” should be applied to PDN pin after applying “Power Supply Voltage” to VDD pin. <EM3242 Datasheet V1.2> －5－ April, 2013 [EM3242] Magnet Direction and Output Voltage 0° S S N N 90° Marking side defines the N polar as 0°, the Output Voltage (AOUT) increases as the magnet rotates counterclockwise. In other words, it decreases as the magnet rotates clockwise. Output Voltage VDD 0.9VDD 0.5VDD 0.1VDD Error signal 0° 180° 360° B<10mT or B>60mT Rotation Angle <EM3242 Datasheet V1.2> －6－ Error output level 0 to 0.2V April, 2013 [EM3242] Package and Terminals マーキング Material of the terminals; Cu Material of the plating; Sn Thickness of the plating; 10μm (Typ.) Weight； 24.3mg *This product is a Pb-Free Product. <EM3242 Datasheet V1.2> －7－ April, 2013 IMPORTANT NOTICE 0. Asahi Kasei Microdevices Corporation (“AKM”) reserves the right to make changes to the information contained in this document without notice. When you consider any use or application of AKM product stipulated in this document (“Product”), please make inquiries the sales office of AKM or authorized distributors as to current status of the Products. 1. All information included in this document are provided only to illustrate the operation and application examples of AKM Products. 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