AS5035_1

AS5035 PROGRAMMABLE 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER D ATA SHEET 1 G eneral Description 2 - K ey Features F ull turn (360°) contactless angular position encoder 2 quadrature A/B outputs with 64 pulses per revolution (ppr), 256 edges per revolution, 1.4° per step Index output (one pulse per revolution) Accurate user programmable zero position (0.35°) Failure detection mode for magnet placement monitoring and loss of power supply Wide temperature range: - 40°C to + 125°C Small lead-free package: SSOP 16 (5.3mm x 6.2mm) T he AS5035 is a magnetic incremental encoder with 64 quadrature pulses per revolution (8-bit resolution) and index output. Two diagnostic outputs are provided to indicate an out-ofrange condition of the magnetic field as well as movement of the magnet in Z-axis. In addition a specific combination of output states indicate a loss of power supply. The AS5035 is available in a small 16pin SSOP package. It can be operated at either 3.3V or 5V supplies. 3 A pplications I ndustrial applications: - Robotics - Replacement of optical encoders - Flow meters - Man-machine interface Automotive applications: - Power seat position sensing - Power mirror position sensing F igure 1: Typical arrangement of AS5035 and magnet 1 .1 - B enefits C omplete system-on-chip, including analog front end and digital signal processing 2 -channel quadrature and index outputs provide an alternative to optical encoders U ser programmable Zero positioning by OTP allows easy assembly of magnet D iagnostic features for operation safety I deal for applications in harsh environments due to magnetic sensing principle R obust system, tolerant to magnet misalignment, air gap variations, temperature variations and external magnetic stray fields N o calibration required 4 P in Configuration F igure 2: AS5035 Pin configuration SSOP16 - R evision 1.5 www.austriamicrosystems.com Page 1 of 17 A S5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER VDDV3V VDD5V LDO 3.3V MagINCn MagDECn CSn Hall Array & Frontend Amplifier Sin Ang Channel A Incremental Decoder Channel B Index DSP Cos Mag A S5035 OTP Zero Position OTP_CLK OTP_DO PROG F igure 3: AS5035 Block diagram 4 .1 P in # P in List & Description N ame T ype A S5035 S SOP16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 M agInc M agDec A B N .C. I ndex V SS P rog O TP_DO O TP_CLK C Sn N .C. N .C. N .C. V DD3V3 V DD5V D O_OD D O_OD DO DO t est DO S upply D I , pd D O_T D I,ST D I_ST, pu t est t est t est S upply S upply Mag. Field indicator Mag. Field indicator Quadrature channel A Quadrature channel B Must be left open Incremental Index output Supply Ground OTP P rog ramming Input. Internal pull-down resistor (~74k Ω ). Should be connected to VSS if not used D ata O utput for Zero Position programming C l oc k I nput for Zero Position programming; SchmittTrigger input. Should be connected to VSS if not used Enable outputs A,B,I (see 5.4). Connect to VSS for normal operation Must be left open Must be left open Must be left open 3V regulator output 5V positive supply input T able 1: Pin description D O_OD DI pu test : : : : digital output, open drain DO : digital push/pull output digital input ST : Schmitt-Trigger input internal pull-up resistor pd : internal pull-down resistor pin is used for factory testing, must be left unconnected 4 .2 U nused Pins P ins # 5, 8, 12, 13 and 14 are for factory testing and must be left unconnected Pins# 8, 9 and 10 are used for OTP Zero Position Programming only. In normal operation, they can be left open or connected to VSS (pins 8 and 10 only) R evision 1.5 www.austriamicrosystems.com Page 2 of 17 A S5035 – 64 PPR INCREMENTAL MAGNETIC ROTARY ENCODER 5 5 .1 5 .1.1 C onnecting the AS5035 P ower Supply 5 .0V Operation 5 .2 L ogic High and Low Levels V DD5V will be either 3.0 - 3.6V or 4.5 - 5.5V, depending on configuration. In either case, the logic levels on output pins A, B and Index will be Vout high = VDD5V – 0.5V, Vout low = VSS+0.4V. C onnect a 4.5V to 5.5V power supply to pin VDD5V only. Add a 1µF to 10µF buffer capacitor to pin VDD3V3 5 .1.2 3 .3V Operation The logic level on the CSn input pin will be Vin high = VDD5V*0.7, Vin low = VDD5V*0.3 C onnect a 3.0V to 3.6 V power supply to both pins VDD5V and VDD3V3. If necessary, add a 100nF ceramic buffer capacitor to pin VDD3V3. 5 .3 5V Operation 2.2...10µF O utput Current T he available maximum output current on pins A, B and Index to maintain the Vout high and Vout low levels is 2mA (sink and source) at VDD5V = 3.0V VDD3V3 100n VDD5V LDO Internal VDD A 4mA (sink and source) at VDD5V = 4.5V 4.5 - 5.5V I N T E R F A C E B Index CSn 5 .4 5 .4.1 C hip Select Pin CSn W ithout Power-up Diagnostic Feature VSS Prog OTP_CLK OTP_DO F or standalone operation without microcontroller, pin CSn should be connected to VSS permanently. The incremental outputs will be available, as soon as the internal offset compensation is finished (within