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[v1-05] 2017-Nov-08

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AS5170 

High-Resolution On-Axis Magnetic 
Angular Position Sensor

The AS5170 is a high-resolution angular position sensor for 
precise absolute angle measurement. The AS5170 is available 
with an analog output interface (AS5170A and AS5170C) or a 
digital output interface (AS5170B and AS5170D). The latter can 
be programmed as a PWM or a SENT-compliant output 
interface.

Based on a Hall sensor technology, this device measures the 
orthogonal component of the flux density (Bz) over a full-turn 
rotation and compensates for external stray magnetic fields 
with a robust architecture based on a 14-bit sensor array and 
analog front-end (AFE). A sub-range can be programmed to 
achieve the best resolution for the application. To measure the 
angle, only a simple two-pole magnet rotating over the center 
of the package is required. The magnet may be placed above 
or below the device. The absolute angle measurement provides 
an instant indication of the magnet’s angular position. The 
AS5170 operates at a supply voltage of 5V, and the supply and 
output pins are protected against overvoltage up to +20V. In 
addition the supply pins are protected against reverse polarity 
up to –20V.

Figure 1:
Typical Arrangement of AS5170A/B/C/D and a Magnet 

Ordering Information

 and 

Content Guide

 appear at end of 

datasheet.

General Description

Содержание AS5170 Series

Страница 1: ...tray magnetic fields with a robust architecture based on a 14 bit sensor array and analog front end AFE A sub range can be programmed to achieve the best resolution for the application To measure the...

Страница 2: ...tions like Rotary button angle sensors Liquid level measurement systems Contactless potentiometers Benefits Features Resolve small angular excursion with high accuracy 12 bit resolution 90 minimum arc...

Страница 3: ...e 4 Functional Blocks of the AS5170B and AS5170D Analog Front End 14 bit A D Register Setting OTP UART LDO Reverse Polarity Protection AS5170A AS5170C OUT VDD VDD3V3 GND ATAN CORDIC Digital Filter 12...

Страница 4: ...n Connected to ground 3 TP2 n a Test pin Leave open 4 TP3 n a Test pin Connected to ground 5 OUT Analog output AS5170A and AS5170C Digital output AS5170B and AS5170D Output interface AS5170A C analog...

Страница 5: ...ds may affect device reliability Figure 7 Absolute Maximum Ratings Symbol Parameter Min Max Units Comments Electrical Parameters VDD DC Supply Voltage at VDD pin 20 20 V Not operational VOUT External...

Страница 6: ...Package Body Temperature 260 C The reflow peak soldering temperature body temperature is specified according to IPC JEDEC J STD 020 Moisture Reflow Sensitivity Classification for Non hermetic Solid St...

Страница 7: ...upply current AS5170A C AGC 255 no magnet placed 4 12 mA lDD_B Supply current AS517B D AGC 255 no magnet placed 4 10 mA ISTART Supply current at start up VREG 2 25V 2 5 5 10 mA TSUP Start up time Func...

Страница 8: ...DD VDDUVTH 10 50 250 s UVRT Undervoltage recovery time Time device return into normal mode from failure band VDD VDDUVTH 10 50 250 s VDDOVTH VDD overvoltage upper threshold 6 0 6 5 7 0 V VDDOVTL VDD o...

Страница 9: ...Required orthogonal component of the magnetic field strength measured at the package surface along a circle of 1 25mm MFER 1 10 90 mT Disp 1 Displacement radius Offset between defined device center an...

Страница 10: ...d at OUT pin with RPUOUT 4 7k CLOAD 1nF VDD 5V 250 s OSNSR Output stage negative step response driver only From VDD to 10 VDD measured at OUT pin with RPUOUT 4 7k CLOAD 1nF VDD 5V 250 s OSTD Output st...

Страница 11: ...requency PWMFR 010 720 800 880 Hz PWMF1 PWM frequency PWMFR 001 900 100 1100 Hz PWMF0 PWM frequency PWMFR 000 1800 2000 2200 Hz PWMVOH PWM output voltage level high IOUT 5 mA PWMVOH VDD VOUT 0 0 4 V P...

Страница 12: ...ENT short circuit output current OUT 0V 40 20 10 mA BKSENTVOH SENT output voltage in broken condition Broken VDD or broken GND RPU 50k SENT constantly high 0 1 2 V SENTVOH SENT output voltage high 4 1...

Страница 13: ...strength MAG the automatic gain control AGC and the angle can be read through the output pin OUT in UART mode The magnetic field coordinates provided by the CORDIC block are fed to a digital filter wh...

Страница 14: ...h pull 01 PWM pull down 10 PWM pull up 11 SENT Only applicable to AS5170B and AS5170D 6 4 RBKDEB Read back debouncing 7 n a No use 0x0F 0 FBS Failure band selection 0 lower failure band 1 upper failur...

Страница 15: ...ocessing offset Reg 0x17 0 LSB Reg 0x19 3 MSB 0x18 7 0 0x19 3 0 7 4 PPGAIN Post processing gain Reg 0x19 4 LSB Reg 0x1B 3 MSB 0x1A 7 0 0x1B 4 0 7 5 BP Break point Reg 0x1B 5 LSB Reg 0x1D 2 MSB 0x1C 7...

Страница 16: ...ut buffer selection 5 DSPRN R W Digital signal processing reset 6 GLOAD R W Enable of gload 7 Not used 0x32 7 0 ANGLECORDIC R Angle of the CORDIC output block Reg0x33 5 MSB Reg0x32 0 LSB 0x33 5 0 7 6...

Страница 17: ...bit START which is followed by 8 data bits D 0 7 one parity bit PAR and a stop bit STOP as shown in Figure 19 Figure 19 UART Frame The PAR bit is even parity calculated over the data bits D 0 7 Each f...

Страница 18: ...e BURNOTP command writes the OTP registers with their programmed values The command is issued by writing to virtual registers 0x62 and 0x63 BURNOTP write 0x62 0x70 write 0x63 0x51 Customer ID A specif...

Страница 19: ...CLMPL CLMPHH PPOFFSET PPGAIN and BP see Figure 24 The clamping level parameters CLMPL and CLMPH define the absolute minimum and maximum level of the output Both clamping levels can be set with the 9...

Страница 20: ...e maximum distance from the start and stop position T1 and T2 To handle the case of a full turn a hysteresis function across the breakpoint can be used to avoid sudden jumps between the lower and uppe...

Страница 21: ...r band achieving again 0 5 LSB output noise The filter is not usable in 360 range if the Hysteresis setting is on Figure 26 Step Response Figure 27 FILTER Setting The FBS setting allows selecting the...

Страница 22: ...er Description Figure 28 Number of Quadrants Figure 29 Dual Quadrant Mode QUADEN Number of Quadrants 00 Single 01 Double 10 Triple 11 Quadruple Upper failure band Lower failure band Max out CLMPH CLMP...

Страница 23: ...Quadrant Mode Figure 31 Quadruple Quadrant Mode Upper failure band Lower failure band Max out CLMPH CLMPL BGPD BVPU Upper clamping band Lower clamping band 360 Measured angle Upper failure band Lower...

Страница 24: ...e and is ratiometric to VDD PWM Output AS5170B D The AS5170B D has a PWM output With the DIGOS setting the PWM output stage can be programmed as a push pull pull down or pull up driver The duty cycle...

Страница 25: ...sor transmitter to the engine control unit receiver The sensor constantly transmits data to the receiver The SENT interface can be enabled on the AS5170B D with the DIGOS setting The SENT frame consis...

Страница 26: ...re n is the decimal representation of the 4 bit data If the nibble data is zero data 0x00 n 0 the nibble duration is 12 ticks while if the nibble data is 15 data 0xFF n 15 its duration is 27 ticks 100...

Страница 27: ...bbles Each nibble is described in Figure 35 Figure 35 Nibble Description Nibble Description 1 Status and communication 2 Angle data most significant nibble 3 Angle data middle significant nibble 4 Ang...

Страница 28: ...RC The SENTESM bit enables the Short Serial Message which is otherwise by default disabled The angular information is contained in nibbles 2 3 and 4 Nibbles 5 and 6 contain a rolling counter which cou...

Страница 29: ...if the offset is below the specified threshold sensor recovers the output Output is forced in failure band Depending on FBS setting SM3 CORDIC overflow Yes if the magnetic input field is below the spe...

Страница 30: ...defined time In case this is not respected output driver is kept in high impedance After a certain time this condition is checked again The readout mechanism for AS5170D is defined by PWMRTH and PWMF...

Страница 31: ...ertain time this condition is checked again The readout mechanism for AS5170C is defined by RDBCKDEB which set the maximum timeout period to wait before triggering an error condition according to the...

Страница 32: ...memory 0x02 to 0x1D has to be read Out of this information the following calculation has to be done Byte 0x02 data2 Byte 0x1D data29 Unsigned int signature unsigned int content unsigned int misr misr...

Страница 33: ...ed angle from ANGLECORDIC register T2 Value 7 Write T1 T2 and all other transfer parameter into the DLL Calculation of GAIN Offset BP Clamping 8 Write reg 0x000A to reg 0x001E with the custom settings...

Страница 34: ...was not successful and the device is incorrectly programmed A reprogramming is not allowed 28 Clear the memory content writing 0x00 into reg 0x001E 29 Write Reg0x23 0x00to set the threshold for the g...

Страница 35: ...programming Reprogramming not allowed Notcorrect Write Reg0x1E 0x00 Write Reg0x23 0x00 Wait 5ms Reg 0x1E 0x00 Read Reg 0x0A To Reg 0x1E correct correct Verify 5 Guardbandtest fails Wrong programming...

Страница 36: ...Pull Up Load Resistor SOIC 8 Figure 43 and Figure 44 show the recommended schematic in the application All components marked with are optional and can be used to further increase the EMC Sensor PCB C...

Страница 37: ...er output VDD capacitor optional C4 4 7 nF VDD serial resistor optional R1 10 OUT load capacitor ECU CL 0 20 nF OUT serial resistor optional R2 50 OUT pull up resistance RLPU 4 10 k OUT pull down resi...

Страница 38: ...Unit Notes VDD buffer capacitor C1 0 8 1 1 2 F VDD3V3 regulator capacitor C2 80 100 120 nF OUT load capacitor sensor PCB C3 0 4 7 nF Do not increase due to programming over output VDD capacitor option...

Страница 39: ...a The internal Hall elements are placed in the center of the package on a circle with a radius of 1 25mm Figure 48 Hall Element Positions Note s and or Footnote s 1 All dimensions in mm 2 Die thicknes...

Страница 40: ...Page 40 amsDatasheet Document Feedback v1 05 2017 Nov 08 AS5170 Package Drawings Markings Figure 49 Packaging Outline Drawing SOIC 8 Package Drawings Markings Green RoHS...

Страница 41: ...Markings Figure 50 Package Markings AS5170 SOIC8 Figure 51 Packaging Code YYWWMZZ YY WW M ZZ Last two digits of the manufacturing year Manufacturing week Plant identifier Free choice traceability code...

Страница 42: ...s distributors and representatives please visit www ams com contact Headquarters ams AG Tobelbader Strasse 30 8141 Premstaetten Austria Europe Tel 43 0 3136 500 0 Website www ams com Ordering Code Pac...

Страница 43: ...lame retardants Br or Sb do not exceed 0 1 by weight in homogeneous material Important Information The information provided in this statement represents ams AG knowledge and belief as of the date that...

Страница 44: ...e in commercial applications Applications requiring extended temperature range unusual environmental requirements or high reliability applications such as military medical life support or life sustain...

Страница 45: ...nt The performance and parameters shown in this document are preliminary without any warranty and are subject to change without notice Datasheet Production Information in this datasheet is based on pr...

Страница 46: ...re numbers for the previous version may differ from page and figure numbers in the current revision 2 Correction of typographical errors is not explicitly mentioned Changes from 1 04 2017 Jun 13 to cu...

Страница 47: ...omer ID 19 Output Linear Transfer Function 21 Multiple Quadrants 24 Extended Magnetic Input Range 24 Analog Output AS5170A C 24 PWM Output AS5170B D 25 SENT Output AS5170B D 29 Diagnostics 30 Diagnost...

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