MAQ473 MPS | Alldatasheet
Document overview
- Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
- PDF pages: 31
Technical content
9-Bit to 14-Bit, MagAlpha Automotive Angle Sensor with ABZ Incremental and PWM Outputs MAQ473 Rev. 1.0 MonolithicPower.com 1 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved.
DESCRIPTION
The MAQ473 detects the absolute angular position of a permanent magnet, typically a diametrically mag netized cylinder on a rotating shaft. Fast data acquisition and processing provide accurate angle measurement at speeds from 0rpm to 60,000rpm. The MAQ473 supports a wide range of magnetic field strengths and spat ial configurations. Both end -of-shaft and off -axis (side-shaft mounting) configurations are supported. The MAQ473 features magnetic field strength detection with programmable thresholds to allow sensing of the magnet position relative to the sensor for creation of functions such a s the sensing of axial movements or for diagnostics. The o n-chip non-volatile memory provides storage for configuration parameters, including the reference zero-angle position, ABZ encoder settings, and magnetic field detection thresholds. The MAQ473 is AEC -Q100 qualified, and is available in a QFN-16 (3mmx3mm) package.
FEATURES
9-Bit to 14-Bit Resolution Absolute Angle Encoder Contactless Sensing for Long Lifespan SPI Serial Interface with Parity Bit for Angle Readout and Chip Configuration Configuration Programmable Magnetic Field Strength Detection for Diagnostic Checks Incremental 12-Bit ABZ Quadrature Encoder Interface with Programmable Pulses Per Turn from 1 to 1024 14-Bit PWM Output 3.3V, 12mA Supply Current -40°C to +150°C Operating Temperature Available in a QFN-16 (3mmx3mm) Package with Wettable Flanks Available in AEC-Q100 Grade 1
APPLICATIONS
Automotive Angle Encoders Automotive Angle or Speed Sensors Robotics All MPS parts are lead -free, halogen -free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS”, the MPS logo, and “Simply, Easy Solutions ” are registered trademarks of Monolithic Power Systems, Inc. or its subsidiaries. TYPICAL APPLICATION A B Z GND VDD VDD 1 mF Quadrature Encoder Incremental Position Sensing N S MOSI MISO CS SCLK Controller SPI Interface Master 3.3V Absolute Position Sensing and Programming MAQ473
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 2 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved.
ORDERING INFORMATION
Part Number* Package Top Marking MSL Rating MAQ473GQE-AEC1 QFN-16 (3mmx3mm) See Below 1 * For Tape & Reel, add suffix -Z (e.g. MAQ473GQE–AEC1-Z). TOP MARKING ____ BNXY LLLL BNX: Product code of MAQ473GQE Y: Year code LLLL: Lot number PACKAGE REFERENCE TOP VIEW QFN-16 (3mmx3mm)
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 3 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. PIN FUNCTIONS Pin # Name Description 1 SSD Data out (SSI). 2 A Incremental output. 3 Z Incremental output. 4 MOSI Data in (SPI). The MOSI pin has an internal pull-down resistor. 5 CS Chip select (SPI). The CS pin has an internal pull-up resistor. 6 B Incremental output. 7 MISO Data out (SPI). MISO has an internal pull-down resistor that is enabled when the device is in a high-impedance state. 8 GND Supply ground. 9 PWM PWM output. 10 TEST Connect to ground. 11 MGL Digital output indicating field strength below the MGLT level. 12 SCLK Clock (SPI). The SCLK pin has an internal pull-down resistor. 13 VDD 3.3V supply. 14 NC No connection. Leave the NC pin unconnected. 15 SSCK Clock (SSI). The SSCK pin has an internal pull-down resistor. 16 MGH Digital output indicating field strength above the MGHT level.
17 Exposed
pad Recommend not to solder. Leave floating. ABSOLUTE MAXIMUM RATINGS (1) Continuous power dissipation (TA = 25°C) (2) ESD Ratings Thermal Resistance (3) θJA θJC Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature T J (MAX), the junction-to- ambient thermal resistance θ JA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by P D (MAX) = (T J (MAX) - TA) / θJA. 3) Measured on JESD51-7, 4-layer PCB.
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 4 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
Parameter Symbol Condition Min Typ Max Units Recommended Operating Conditions Supply voltage VDD 3.0 3.3 3.6 V Supply current IDD From -40°C to +125°C 10.2 12 13.8 mA Operating (ambient) temperature TA -40 +150 °C Applied magnetic field B 30 60 mT
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 5 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. GENERAL CHARACTERISTICS VDD = 3.3V, 45mT < B < 100mT, TA = -40°C to +125°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Absolute Output (Serial) Effective resolution (±3σ) filter window τ = 64µs 9.0 9.8 10.5 bits filter window τ = 16ms 13.0 13.8 14.5 bits Noise root mean square (RMS) filter window τ = 64µs 0.04 0.07 0.12 deg filter window τ = 16ms 0.003 0.004 0.007 deg Refresh rate 850 980 1100 kHz Data output length 16 16 bits Response Time Start-up time (4) filter window τ = 64µs 0.6 ms filter window τ = 16ms 260 ms Latency (4) Constant speed propagation delay 8 10 µs Filter cutoff frequency (4) fCUTOFF filter window τ = 64µs 6 kHz fCUTOFF filter window τ = 16ms 23 Hz Accuracy Integral nonlinearity (INL) at 25°C At room temperature across the full field range 0.7 deg INL between -40°C and +125°C (5) Across the full temperature range and field range 1.1 deg INL at 150°C Across the full field range 1.16 deg Output Drift Temperature-induced drift at room temperature (5) 0.015 deg/°C Temperature-induced variation (5) From 25°C to 85°C 0.5 deg From 25°C to 125°C 1.0 deg Magnetic field induced (5) 0.005 deg/mT Voltage supply induced (5) 0.3 deg/V Absolute Output (PWM) PWM frequency fPWM 840 970 1090 Hz PWM resolution 13 13.8 14.0 bits Incremental Output (ABZ) ABZ update rate 16 MHz Resolution (edges per turn) Programmable 4 4096 Pulses per channel per turn PPT + 1 Programmable 1 1024 ABZ hysteresis (5) H Programmable 0.08 2.8 deg Systematic jitter (5) For PPT = 1023, up to 60mT 11 % For PPT = 127 7 %
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 6 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. GENERAL CHARACTERISTICS (continued) VDD = 3.3V, 45mT < B < 100mT, TA = -40°C to +125°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Magnetic Field Detection Thresholds Accuracy (5) 5 mT Hysteresis (5) MagHys 6 mT Temperature drift (5) -600 ppm/°C Digital I/O Input high voltage VIH 2.5 5.5 V Input low voltage VIL -0.3 +0.8 V Output low voltage (5) VOL IOL = 4mA 0.4 V Output high voltage (5) VOH IOH = 4mA 2.4 V Pull-up resistor RPU 46 66 97 kΩ Pull-down resistor RPD 43 55 97 kΩ Rising edge slew rate (4) tR CL = 50pF 0.7 V/ns Falling edge slew rate (4) tF CL = 50pF 0.7 V/ns Notes: 4) Guaranteed by design. 5) Guaranteed by characterization.
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 7 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. TYPICAL CHARACTERISTICS VDD = 3.3V, TA = 25°C, unless otherwise noted. ABZ Jitter PPT = 255, τ = 1ms Current Consumption Filter Transfer Function τ = 16ms Error Curve 50mT Nonlinearity (INL and Harmonics) Effective Resolution Noise Spectrum 50mT and τ = 16ms
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 8 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. FUNCTIONAL BLOCK DIAGRAM Figure 1: Functional Block Diagram
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 14 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. A write register operation consists of two 16 -bit frames. The first frame sends a write request, which contains the 3 -bit write command (100) , followed by the 5-bit register address and the 8- bit value (MSB first). T he second frame returns the newly written register value (acknowledge). The NVM is guaranteed to endure 1,000 write cycles at 25°C. It is critical to wait 20ms between the first and the second frame. This is the time taken to write to the NVM. Failure to implement this wait period result s in the register ’s previous value being read. Note that this delay is only required after a write request. A read register request or read angle does not require this wait time. The first 16-bit SPI frame (write request) is: MSB LSB MISO Angle[15:0] Command Reg. Address Register Value MOSI 1 0 0 A4 A3 A2 A1 A0 V7 V6 V5 V4 V3 V2 V1 V0 The second 16-bit SPI frame (response) is: Register Value MISO V7 V6 V5 V4 V3 V2 V1 V0 0 0 0 0 0 0 0 0 MSB LSB MOSI 0 The readback register content can be used to verify the register programming. Figure 13 shows a complete transmission overview. For example, to set the value of the output rotation direction (RD) to counterclockwise (high), write register 9 by sending the following first frame: MSB LSB MISO Angle[15:0] Command Reg. Address Register Value MOSI 1 0 0 0 1 0 0 1 1 0 0 0 0 0 0 0 Send the second frame after a 20ms wait time. If the register is written correctly, the reply is: Register Value MISO 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 MSB LSB MOSI 0 See Figure 14 for a complete example. Figure 13: Overview of Two 16-Bit Frames Write Register Operation
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 17 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. Figure 18: SPI Angle Reading with Parity Bit
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 18 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. REGISTER MAP Table 8: Register Map # of Registers Hex Binary Bit[7] (MSB) Bit[6] Bit[5] Bit[4] Bit[3] Bit[2] Bit[1] Bit[0] (LSB) 0 0x0 00000 Z[7:0] 1 0x1 00001 Z[15:8] 2 0x2 00010 BCT[7:0] 3 0x3 00011 - - - - - - ETY ETX 4 0x4 00100 PPT[1:0] ILIP[3:0] - - 5 0x5 00101 PPT[9:2] 6 0x6 00110 MGLT[2:0] MGHT[2:0] - - 9 0x9 01001 RD - - - - - - - 14 0xE 01110 FW[7:0] 16 0x10 10000 HYS[7:0] 27 0x1B 11011 MGH MGL MIR[3:0] - - Table 9: Factory Default Values # of Registers Hex Binary Bit[7] (MSB) Bit[6] Bit[5] Bit[4] Bit[3] Bit[2] Bit[1] Bit[0] (LSB) 0 0x0 00000 0 0 0 0 0 0 0 0 1 0x1 00001 0 0 0 0 0 0 0 0 2 0x2 00010 0 0 0 0 0 0 0 0 3 0x3 00011 0 0 0 0 0 0 0 0 4 0x4 00100 1 1 0 0 0 0 0 0 5 0x5 00101 1 1 1 1 1 1 1 1 6 0x6 00110 0 0 0 1 1 1 0 0 9 0x9 01001 0 0 0 0 0 0 0 0 14 0xE 01110 0 1 1 1 0 1 1 1 16 0x10 10000 1 0 0 1 1 1 0 0
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 19 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. Table 10: Programming Parameters Parameters Symbol # of Bits Description See Table Zero setting Z 16 Sets the zero position 11 Bias current trimming BCT 8 For side-shaft configuration: reduces the bias current of the X or Y Hall device 14 Enable trimming X ETX 1 Biased current trimmed in the X-direction Hall device 15 Enable trimming Y ETY 1 Biased current trimmed in the Y-direction Hall device 15 Pulses per turn PPT 10 Number of pulses per turn of the ABZ output 19 Index length/position ILIP 4 Parametrization of the ABZ index pulse Figure 27 Magnetic field high threshold MGHT 3 Sets the field strength high threshold 16 Magnetic field low threshold MGLT 3 Sets the field strength low threshold 16 Rotation direction RD 1 Determines the sensor positive direction 13 Filter window FW 8 Size of the digital filter window 18 Hysteresis HYS 8 ABZ output hysteresis 21
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 20 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. REGISTER SETTINGS Zero Setting The MAQ473’s zero position (a0) can be programmed with 1 6 bits of resolution. The angle streamed out by the MAQ473 (aOUT) is calculated with Equation (2): OUT RAW 0a = a - a (2) Where aRAW is the raw angle provided by the MAQ473’s front end. The parameter Z [15:0], which is 0 by default, is the complementary angle of the zero setting . In decimals, it can be calculated with Equation (3): Table 11 shows the zero-setting parameter. Table 11: Zero-Setting Parameter Z[15:0] Zero Position a0 (16-Bit Decimal) Zero Position a0 (deg) 0 65536 360.000 1 65535 359.995 2 65534 359.989 … … … 65534 2 0.011 65535 1 0.005 Example To set the zero position to 20 °, the Z[15:0] parameter must be equal to the complementary angle, and can be calculated with Equation (4): 16 16 20[15 : 0] 2 2 61895360Z (4) In binary, it is written as 1111 0001 1100 0111. Table 1 2 shows the content of registers 0 and Table 12: Register 0 and 1 Content Reg Bit[7] Bit[6] Bit[5] Bit[4] Bit[3] Bit[2] Bit[1] Bit[0] 0 1 1 0 0 0 1 1 1 1 1 1 1 1 0 0 0 1 Rotation Direction By default , when looking at the top of the package, the angle increases when the magnetic field ro tates clock wise (CW) (see Figure 19 and Table 13). Figure 19: Positive Rotation Direction of the Magnetic Field Table 13: Rotation Direction Parameter RD Positive Direction
0 Clockwise (CW)
1 Counterclockwise (CCW)
BCT Settings (Bias Current Trimming) Side-Shaft When the MAQ473 is mounted on the side of the magnet, the relation ship between the field angle and the mechanical angle is no longer directly linear. This effect is related to the fact that the tangential magnetic field is usually smaller than the radial field. Calculate the field ratio (k) with Equation (5): RAD TANk = B /B (5) Where BRAD and BTAN are the maximum radial and tangential magnetic fields (see Figure 20). BRAD BRAD BTAN BTAN Figure 20: Side-Shaft Field The k ratio depends on the magnet geometry and the distance to the sensor. Having a k ratio different than 1 results in the sensor output response not being linear with respect to the mechanical angle. Note that the error curve has the shape of a double sinewave (see Figure 2 2 on page 21). E is the amplitude of this error.
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 22 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. Sensor Orientation From the dot marked on the package , it is possible to know whether the radial field is aligned with sensor coordinate X or Y (see Figure 24). Figure 24: Package Top View with X- and Y-Axes Determine which axis needs to be reduced based on the qualitative field distribution around a ring (see Figure 20 on page 20). For example, with the arrangement shown in Figure 24, the field along the sensor Y direction is tangential and weaker , so t he X-axis should be reduced (ETX = 1 and ETY = 0 ). If both ETX and ETY are set to 1 , the current bias is reduced in both directions the same way (i.e. without side -shaft correction) (see Table 15). Table 15: Trimming Direction Parameters ETX Enable Trimming of the X-Axis
0 Disabled
1 Enabled
ETY Enable Trimming of the Y-Axis The magnetic flags (MGL and MGH ) indicate that the magnetic field at the sen sor position is out of the range defined by t he lower (MGLT) and upper magnetic field thresholds (MGHT) (see Figure 25). Figure 25: MGH and MGL Signals as a Function of the Field Strength MagHys, the typical hysteresis on the MGH and MGL signals, is 6mT. The MGLT and MGHT thresholds are coded on 3 bits and stored in register 6 (see Table 16). Table 16: Register 6 Register 6 Bit[7] Bit[6] Bit[5] Bit[4] Bit[3] Bit[2] Bit[1] Bit[0] MGLT MGHT - - The 3-bit MGLT and MGHT values correspond to the magnetic field (see Table 17). Table 17: MGLT and MGHT: Binary to mT Relationship MGLT or MGHT (8) Field Threshold in mT (7) From Low to High Magnetic Field From High to Low Magnetic Field 000 26 20 001 41 35 010 56 50 011 70 64 100 84 78 101 98 92 110 112 106 111 126 120 Notes: 7) Valid for V DD = 3.3V. If different , then the field threshold is scaled by the factor VDD / 3.3V. 8) MGLT can have a larger value than MGHT. The MGL and MGH alarm flags are available to be read in register 27 (bit [6] and bit[7], respectively), and their logic state is also given at digital output pins 11 and 16. To read the MGL and MGH flags via the SPI, send the 16-bit read command for register 27: Command Reg. Address MSB Value LSB 0 1 0 1 1 0 1 1 0 0 0 0 0 0 0 0 The MAQ47 3 responds with the register 27 content in the next transmission: Register 27 [7:0] MGH MGL MIR[3:0] x x The MGL and MGH flags ’ logic state has no effect on the angle output. Filter Window (FW) The filter window (FW) affects the effective resolution (defined as the ±3σ noise interval) and the output bandwidth, which is characterized by fCUTOFF.
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 25 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. Diagnostic Features The following feature s can be used to determine correct operation: 1. Parity bit on the angle (see the Parity Bit section on page 16). 2. Magnetic field in range via MIR [3:0] (see below). Magnetic Field in Range Bits MIR [3:0] in register 27 can be used to verify that the magnetic field is between the thresholds set by MGLT[2:0] and MGHT[2:0] in register 6. The value of MIR[3:0] is 0011 when the field is between these thresholds. This also indicates that the Hall sensor front end is functioning correctly and acquiring angle samples. For example , assuming MGLT[2:0] is at its default value of 00 (15mT), and the MGHT[2:0] is at 111 (126mT), then if the field strength is between these val ues, the MIR[3:0] value is 0011. Table 23 shows the MIR[3:0] values f or the default threshold settings described above. Table 23: MIR[3:0] Logic States MIR[3:0] Conditions MGLT[2:0] at default 15mT, MGHT[2:0] at default 126mT
0011 Field in range and Hall sensor array operational
1111 Field above MAGH and MAGL threshold (magnet too close to sensor)
0000 Field below MAGH and MAGL threshold (magnet too far away/missing)
0001 Invalid state: Hall array sensor functional error
0010 Invalid state: Hall array sensor functional error
0100 Invalid state: Hall array sensor functional error
1000 Invalid state: Hall array sensor functional error
1001 Invalid state: Hall array sensor functional error
1010 Invalid state: Hall array sensor functional error
1011 Invalid state: Hall array sensor functional error
1100 Invalid state: Hall array sensor functional error
1101 Invalid state: Hall array sensor functional error
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 27 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved.
PACKAGE INFORMATION
QFN-16 (3mmx3mm)
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 28 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. APPENDIX A: DEFINITIONS Effective Resolution (3σ noise level) The smallest angle increment distinguishable from the noise. The resolution is measured by computing three times σ ( the standard deviation in degrees) taken across 1,000 data points at a constant position. The resolution in bits is obtained with: log2(360 / 6σ). Refresh Rate The rate at which new data points are stored in the output buffer. ABZ Update Rate The r ate at which a new ABZ s tate is computed. The inverse of this ra te is the minimum time between two ABZ edges. Latency The time elapsed between the instant when the data is ready to be read and the instant at which the shaft passes that position. The lag in degrees is lag = latency x v, where v is the angular velocity in deg/s. Start-Up Time The time until the sensor delivers valid data beginning at start-up. Integral Nonlinearity (INL) Maximum deviation between the average sensor output (at a fixed position) and the true mechanical angle (see Figure A1). Figure A1: Resolution, INL, Lag INL can be obtained from the error curve err(a) = out (a) - a, where out(a) is the average across 1,000 sensor output s and a is the mechanical angle indicated by a high-precision encoder (<0.001°). INL is then calculated with Equation (A1): max(err(a)) - min(err(a))INL = 2 (A1) Drift The angle variation rate when one parameter is changed (e.g. temperature, V DD) but all others, including the shaft angle, remain constant.
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 29 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. APPENDIX B: SPI COMMUNICATION CHEATSHEET Read Angle Read Register Write Register
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS MAQ473 Rev. 1.0 MonolithicPower.com 30 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. CARRIER INFORMATION Pin1 1 1 1 1 ABCD ABCD ABCD ABCD Feed Direction Part Number Package (3mmx3mm) 5000 N/A N/A N/A 13in 12mm
MAQ473 – 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS Notice: The information in this document is subject to change without notice. Users should warrant and guarantee that third - party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MAQ473 Rev. 1.0 MonolithicPower.com 31 5/12/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved.
REVISION HISTORY
Revision # Revision Date Description Pages Updated 1.0 5/12/2021 Initial Release -