AEAT-8811-Q24

Data Sheet AEAT-8811-Q24 Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration Overview The Broadcom AEAT-8811-Q24 is an angular magnetic rotary sensor that provides accurate angular measurement over a full 360 degrees of rotation. It is a sophisticated system that uses integrated Hall sensor elements with complex analog and digital signal processing within a single device. A simple two-pole magnet generates the necessary magnetic field by rotating it in perpendicular, placed in alignment to the center of the device. The Broadcom AEAT-8811-Q24 is a versatile solution capable of supporting a broad range of applications with its robust architecture to measure and deliver both absolute and incremental signals. The absolute angle measurement provides an instant indication of the magnet's angular position with a selectable and one-time programmable resolution of 10, 12, 14, or 16 bits. When selected, its positioning data is then represented in its digital form to be assessed through a standard SSI 3-wire communication protocol. Where desired, users may also choose to receive its absolute angle position in PWM-encoded output signals. The incremental positions are indicated on ABI and UVW signals with user-configurable CPR 32, 64, 128, 256, 512, 1024, 2048, 4096 and 50, 100, 200, 400, 800, 1000, 2000, and 4000 of ABI signals and pole pairs from 1 to 8 (2 to 16 poles) for UVW commutation signals. AEAT-8811-Q24 requires no offset calibration programming and operates at 5V supply. Broadcom Key Features 5V operation Selectable 10, 12, 14, or 16 bits of absolute resolution Incremental output of ABI UVW (32, 64, 128, 256, 512, 1024, 2048, 4096, 50, 100, 200, 400, 800, 1000, 2000, 4000 CPR) PWM output modes User-programmable zero position, direction, and index width Selectable zero latency mode option Programmable hysteresis Available in 2-wire or 3-wire SSI options. Selectable 3-wire SSI option with initial data output at tri-state mode Compact QFN-24 leads (5 mm × 5 mm) package RoHS compliant No programming required for offset calibration Specifications Absolute 10-bit to 16-bit resolution Incremental output resolutions of 32 to 4096 CPR UVW output of 1 to 8 pole pairs Wide operating temperature: –40°C to 125°C Applications Brushless DC motor and stepper motor Resolver and potentiometer replacement Industrial automation and robotics Industrial sewing machine and textile equipment AEAT-8811-Q24-DS100 February 21, 2020 AEAT-8811-Q24 Data Sheet NOTE: This product is not specifically designed or manufactured for use in any specific device. Customers are solely responsible for determining the suitability of this product for its intended application and are solely liable for all loss, damage, expense, or liability in connection with such use. Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration Figure 1: ABI Signals of AEAT-8811-Q24 Definition Electrical Degree (°e): CPR × 360 electrical degrees = 360 mechanical degrees. Cycle (C): One cycle of the incremental signal is 360 mechanical degrees/resolution and is equal to 360 electrical degrees (°e). Pulse Width (P): The number of electrical degrees that an output is high during one cycle, nominally 180°e or one-half of a cycle. State Width (S): The number of electrical degrees between a transition in the output of channel A and the neighboring transition in the output of channel B. There are four states per cycle, each nominally 90°e. Phase (Φ): The number of electrical degrees between the center of the high state on channel A and the center of the high state on channel B. Integral non-linearity (INL): The maximum deviation between the actual angular position and the position indicated by the encoder's output count, over one revolution. It is defined as the most positive linearity error +INL or the most negative linearity error –INL from the best fit line, whichever is larger. Figure 2: Integral Non-Linearity Example Relative angular accuracy: With reference to the output period at A and B. The relative accuracy of the edges to each other at a CPR setting of 256 is within ± 10% for 5V operation in a typical condition. Therefore, based on a period at A or B, the edge occurs in a window between 40% and 60% as shown in the following figure. Broadcom AEAT-8811-Q24-DS100 2 AEAT-8811-Q24 Data Sheet Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration Functional Description Figure 3: AEAT-8811-Q24 Block Diagram Broadcom AEAT-8811-Q24-DS100 3 Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration AEAT-8811-Q24 Data Sheet Pin Assignment Figure 4: Pin Configurations for AEAT-8811-Q24 Table 1: Pinout Description Pin Symbol Description 1–6 No Connection N/A 7 I Index output (ABI mode) 8 B Incremental B output (ABI mode) 9 A Incremental A output (ABI mode) 10 SSI_SCL_SPI_CLK SSI/SPI clock input 11 SSI_SCL_SPI_DI SSI/SPI data input 12 SSI_SCL_SPI_D0 SSI/SPI data out 13 VSS Supply ground 14 VDDA 5V supply input 15 No Connection No connection 16 No Connection No connection 17 No Connection No connection 18 No Connection No connection 19 VDDA 5V supply input 20 VSS Supply ground 21 SSI_SCL_SPI_SEL SSI/SPI select pin 22 U U commutation output (UVW mode) 23 V V commutation output (UVW mode) 24 W or PWM W commutation (UVW mode)/PWM output 25 VSS Supply ground Broadcom AEAT-8811-Q24-DS100 4 Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration AEAT-8811-Q24 Data Sheet The AEAT-8811-Q24 is manufactured with a CMOS standard process. It is capable of accurately measuring a magnet's rotational angle when it is placed in alignment and perpendicular to the device by using its integrated Hall sensors to detect its magnetic field. The detected magnetic signals are then taken as input signals to be properly conditioned to negate its nonidealities before inputting them into the analog amplifiers for strength amplification and filtering. After which, the amplified analog signals are fed into the internal analog-to-digital converter (ADC) to be converted into digital signals for the final stage of digital processing. The digital processing provides a digitized output of the absolute and incremental signals. For optimal performance, the used magnet's center axis should be aligned with the center of the device with a tolerable displacement radius of 0.5 mm from the defined Hall sensor center as described in Magnet and IC Package Placement. Moreover, the used magnet should have sufficient magnetic field strength (mT) to generate the magnetic field for the signal generation as highlighted in Recommended Magnetic Input Specifications. The device provides digital information of magnetic field strength high (MHi) and magnetic field strength low (MLo) from the SSI read to indicate whether the magnets are too close or too far away from the device's surface. Users can assess the device's digitized absolute data using standard Synchronous Serial Interface (SSI) protocols. In addition, an absolute angular representation can also be selected using a pulse-width modulated (PWM) signal. The incremental outputs are available from the digital outputs of their respective A, B, and I pins. This is the same for the U, V, and W pins. Absolute Maximum Ratings Parameter Symbol Min. Max. Unit TS –40 125 °C — VDD –0.3 5.5 Volts — Input Voltage Range Vin –0.3 5.5 Volts — Electrostatic Discharge — –2.0 +2.0 kVolts — Moisture Sensitivity Level — — 3 — Storage Temperature DC Supply Voltage VDDA Pin Notes Maximum floor life = 168 hours CAUTION! Subjecting the product to stresses beyond those listed in this section may cause permanent damage to the devices. These are stress ratings only and do not imply that the devices will function beyond these ratings. Exposure to the extremes of these conditions for extended periods may affect product reliability. Electrical Characteristics Recommended Operating Conditions Parameter Symbol Min. Operating Ambient Temperature TA DC Supply Voltage to VDD Pin 5V Operation VDD OTP Programming Voltage at VDDA Pin — Broadcom Typ. Max. Unit Notes –40 — 125 °C — 4.5 5.0 5.5 Volts — 5.5 5.6 5.7 Volts — AEAT-8811-Q24-DS100 5 Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration AEAT-8811-Q24 Data Sheet Parameter Incremental Output Frequency Symbol Min. Typ. Max. Unit Notes fMAX — — 1.0 MHz Frequency = Velocity(rpm) x CPR/60 CL — — 15 pF Load Capacitance — System Parameters Condition: Electrical characteristics are over the recommended operating conditions. Typical values are specified at VDD = 5.0V and 25°C, optimum placement of magnet. Parameter Symbol Min. Typ. Max. Unit Notes IDD — 24 28 mA — High Level Output Voltage VOH VDD – 0.5 — — Volts Normal operation Low Level Output Voltage VOL — — GND + 0.4 Volts — tPwrUp — 4 ms — Input High Level VIH 0.7 x VDD — — Volts — Input Low Level VIL — — 0.3 x VDD Volts — Pull-Up Low Level Input Current IIL — — 120 µA — Pull-Down High Level Input Current IIH — — 120 µA — Symbol Min. Typ. Max. Current Consumption Supply Current Normal Operation Mode Digital Outputs (DO) Power-Up Time Absolute Output Incremental Output PWM Output Digital Inputs (DI) Encoding Characteristics Parameter Unit Notes Absolute Output Resolution RES 10 — 16 Bit INLnom — — ±0.35 Deg Best fit line, centered magnet. Tamb = 25°C at 5V Integral Non-Linearity INL — — ±1.0 Deg Best fit line, over displacement of magnet. Tamb = –40 to +125°C Voltage = 5V Output Sampling Rate fS — 10 — MHz Based on the SSI protocol Code Monotony 10, 12, 14 bit — — 1 — Step Tamb = –40 to 125ºC @5V Integral Non-Linearity (Optimum) Broadcom 10, 12, 14, or 16 bits AEAT-8811-Q24-DS100 6 Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration AEAT-8811-Q24 Data Sheet Parameter Symbol Min. Typ. Max. Unit Notes RINC 32 — 4096 CPR Programmable options 32, 64, 128, 256, 512, 1024, 4096, 50, 100, 200, 400, 800, 1000, 2000, and 4000 CPR Index Pulse Width PO 90 — 360 °e Programmable options: 90, 180, 270, or 360 °e Relative Angular Accuracy % — ±10% — % Reference to an output period at output A and B, at 256 CPR, 5V, and 10,000 RPM Incremental Output (Channel ABI) Resolution Commutation Characteristic (Channel U,V,W) Commutation Format Commutation Accuracy Programmable pole pairs from 1 to 8 (2 to 16 poles) ΔUVW — ±2 — °mechanical — fPWM 122 — 976 Hz Adjustable based on the PWM settings Minimum Pulse Width PWMIN — 1 — µs — Maximum Pulse Width PWMAX — 8192 — µs — PWM Output PWM Frequency NOTE: Encoding characteristics are over the recommended operating range unless otherwise specified. Encoding Timing Characteristics Parameter Symbol Min. Typ. Max. Unit tdelay — 4 — ms Notes Incremental Output (ABI & UVW) System Reaction Time First ABI pulse detection upon power-up. Recommended Magnetic Input Specifications Parameter Symbol Min. Diameter d Thickness t Magnetic Input Field Magnitude Magnet Displacement Radius Recommended Magnet Material and Temperature Drift Broadcom Typ. Max. Unit Notes — 6 — mm — 2.5 — mm Recommended magnet: Cylindrical magnet, diametrically magnetized and 1 pole pair. Bpk 45 — 75 mT Required vertical component of the magnetic field strength on the die's surface, measured along concentric circle. R_m — — 0.25 mm Displacement between the magnet axis and the device center. — — –0.12 — %/K NdFeB (Neodymium Iron Boron), grade N35SH. AEAT-8811-Q24-DS100 7 AEAT-8811-Q24 Data Sheet Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration Diametrically Magnetized Magnet Magnet and IC Package Placement Figure 5: Defined Chip Sensor Center and Magnet Displacement Radius Align the magnet's center axis within a displacement radius of 0.25 mm from the defined Hall sensor center. Place the magnet so that it faces the sensor. The magnet must be mounted on a nonmagnetic part. The Z gap varies depending on the magnetic strength on the die surface, with the recommended magnet material and dimensions. The typical distance Z is 0.75 mm to 1.25 mm (1 mm ± 0.25 mm). It is important not to put magnetic material close to the magnet because it will affect the magnetic field and increase the INL. Broadcom AEAT-8811-Q24-DS100 8 Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration AEAT-8811-Q24 Data Sheet Figure 6: Vertical Placement of the Magnet Timing Characteristic Symbol Min. Typ. Max. Unit Notes 10,000 kHz SCL clock frequency for the SSI protocol Fclk — — tREQ 300 — tNSLH 200 — NOTE: — ns Minimum time required for the encoder to prepare SSI output ns Minimum wait time between SSI requests SSI timing characteristics are over the recommended operating range unless otherwise specified. See SSI 3 Wires for more information on the table. Memory Map The Broadcom AEAT-8811-Q24 uses nonvolatile one-time programmable (OTP) as shown in the following tables. The memory is separated into 8 bits per address. Nonvolatile Register (OTP) 1. OTP is one-time programmable only. Any OTP bit with value 0 can be written to 1, but not vice versa. Do not program 1 to the same address bit twice. 2. OTP shadow registers are volatile registers that are loaded with corresponding OTP values after power-on. 3. All bits (except addresses 0x00–0x03, 0x10–0x12, and 0x1B) are in a LOCK mode by default after power-on. To enter UNLOCK mode (to be able to write to the OTP shadow registers or registers), write 0xAB to address 0x10. 4. In UNLOCK mode, write to any OTP shadow registers or registers. Values written remain until power-off. 5. The UNLOCK state is maintained until the power supply is turned OFF or any value (except 0xAB) is written to address 0x10. 6. All OTP memory is programmable only by writing appropriate commands to addresses 0x11–0x14 and 0x1B. Broadcom AEAT-8811-Q24-DS100 9 Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration AEAT-8811-Q24 Data Sheet OTP Shadow Registers 1. OTP shadow registers are volatile (upon power-up, reload values from OTP) and are not written to OTP automatically. 2. To write OTP shadow register values to OTP (nonvolatile) memory, see Programming OTP via SPI. 3. The OTP shadow registers are from addresses 0x00 to 0x0D. The following tables show the registers. Customer Reserve and Zero Offset Registers Table 2: Customer Reserve and Zero Reset Registers Address Bit(s) Name Description Default 0x00 [7:0] Customer Reserve 0 User programmable 8'h0 0x01 [7:0] Customer Reserve 1 User programmable 8'h0 0x02 [7:0] Zero Reset0 Zero Reset Position [7:0] 8'h0 0x03 [7:0] Zero Reset1 Zero Reset Position [15:8] 8'h0 Customer Configuration Registers These registers are required to unlock and can be done by writing 8'hAB to address 0x10 and then writing to the OTP shadow register. Customer Configuration 0 Table 3: Customer Configuration 0 Registers Address Bit(s) Name 0x04 [7] UVW Select 1: select UVW mode 0: select PWM mode 0 [4:3] I-width Setting 11: (ABI) I-width = 360 electrical deg (edeg) 10: (ABI) I-width = 270 electrical deg (edeg) 01: (ABI) I-width = 180 electrical deg (edeg) 00: (ABI) I-width = 90 electrical deg (edeg) 00 [2:0] UVW Setting/PWM Setting 111: UVW = 2 pole pairs 110: UVW = 1 pole pair 101: UVW = 8 pole pairs 100: UVW = 7 pole pairs 011: UVW = 6 pole pairs 010: UVW = 5 pole pairs 001: UVW = 4 pole pairs 000: UVW = 3 pole pairs 000 Broadcom Description Default AEAT-8811-Q24-DS100 10 Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration AEAT-8811-Q24 Data Sheet Customer Configuration 1 Table 4: Customer Configuration 1 Registers Address Bit(s) [6:3] Name Broadcom Default CPR Setting 1 1111: (ABI) 512 CPR 1110: (ABI) 256 CPR 1101: (ABI) 128 CPR 1100: (ABI) 64 CPR 1011: (AB I) 32 CPR 1010: (ABI) 4000 CPR 1001: (ABI) 2000 CPR 1000: (ABI) 1000 CPR 0111: (ABI) 800 CPR 0110: (ABI) 400 CPR 0101: (ABI) 200 CPR 0100: (ABI) 100 CPR 0011: (ABI) 50 CPR 0010: (ABI) 4096 CPR 0001: (ABI) 2048 CPR 0000: (ABI) 1024 CPR 0000 Hysteresis Setting 111: 0.18 mechanical degree (mdeg) 110: 0.09 mechanical degree (mdeg) 101: 0.04 mechanical degree (mdeg) 100: 0.02 mechanical degree (mdeg) 011: 0.01 mechanical degree (mdeg) 010: 0.00 mechanical degree (mdeg) 001: 0.07 mechanical degree (mdeg) 000: 0.35 mechanical degree (mdeg) 000 0x05 [2:0] Description AEAT-8811-Q24-DS100 11 Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration AEAT-8811-Q24 Data Sheet Customer Configuration 2 Table 5: Customer Configuration 2 Registers Address Bit(s) Name [7] Dir [6] Description Default 1: Count up in a counter-clockwise rotation 0: Count up in a clockwise rotation 0 Zero Latency Modeb 1: Zero Latency is ON 0: Zero Latency is OFF 0 [5:4] Absolute Resolution 11: 14-b absolute resolution (SSI) 10: 16-b absolute resolution (SSI) 01: 10-b absolute resolution (SSI) 00: 12-b absolute resolution (SSI) 00 [3] SSI_Select 1: Data 1st clock edgec 0: Default 00 [2:0] CPR Setting 2d 111: (ABI) 32, 64, 128, 256, 50, 100, 200, 400 CPR 011: (ABI) 2048, 4096, 2000, 4000 CPR 000 a 0x06 001: (ABI) 512, 1024, 800, 1000 CPRe 000: (ABI) 512, 1024, 800, 1000 CPR a. See Figure 7 for the direction definition. b. When Zero Latency Mode is On, the user must set CPR setting 2 in 0x06 to 010 for all the applicable CPR (32–4096). c. Initial Data Output tri-state (high impedance). d. Incremental: CPR setting 1 in address 0x05 must match CPR setting 2 in 0x06. Absolute: For absolute only application, set CPR setting 2 in 0x06 to 010. e. For better dynamic performance, a higher latency setting is required. Feature Settings Zero Reset The AEAT-8811-Q24 allows the user to configure a Zero Reset position. This value is stored at OTP 0x02 (lower 8-b) and 0x03 (upper 8-b). To set the Zero Reset position, for example, to position X, perform the following steps. NOTE: The user should decide the desired direction or orientation (as detailed in Direction) before setting the Zero Reset position. 1. Stop the motor at position X. 2. Read the 16-b value of position X using the SSI protocol (for example, read 16'hABCD). 3. Write lower 8-b (from the preceding example, 8'hCD) to OTP shadow registers 0x02 using SPI. 4. Write upper 8-b (from the preceding example, 8'hAB) to OTP shadow registers 0x03 using SPI. 5. Confirm that the correct Zero Reset value is written to OTP shadow registers by rereading the motor position value using SSI. Make sure that the current position read is 16'h0000 (excluding step jumps incurred by noise). 6. To permanently save this Zero Reset value, write 8'hA2 to internal registers 0x12. 7. Power-cycle (power off and power on) the chip, and confirm that the correct Zero Reset value is written to OTP by rereading the motor position value using SSI. Make sure that the current position read is 16'h0000 (excluding step jumps incurred by noise). Broadcom AEAT-8811-Q24-DS100 12 AEAT-8811-Q24 Data Sheet Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration Direction The direction must be defined as to whether to count up clockwise or counterclockwise per rotation. Per the default setting, if the magnet is spinning clockwise based on the user's line of sight per the following figure, then the AEAT-8811-Q24 will count up. Figure 7: Direction Definition When the Magnet Rotates Absolute Output Format The AEAT-8811-Q24 provides SSI 3 wires and PWM outputs to indicate the absolute position of the motor. SSI 3 Wires The SSI protocol uses three pins that are shared between the SSI and SPI protocols. Use SSI_SPI_sel (the input pin) to select either protocol at a time. Assert 1 on SSI_SPI_sel to select the SSI protocol, which supports up to 10-MHz clock rates. SSI_NSL_SPI_DIN → NSL (enable) signal for the SSI protocol, input to the AEAT-8811-Q24 SSI_SCL_SPI_CLK → SCL (clock) signal for the SSI protocol, input to the AEAT-8811-Q24 SSI_DO_SPI_DO → DO (data out) signal for the SSI protocol, output from the AEAT-8811-Q24 NOTE Notes for timing diagram in the following figure: NSL must be held high for at least 3 ms after power-up. NSL = 1 means it is in load mode and is used to obtain the position of the magnet. NSL = 0 is shift mode of the registers, and with the SCL (clock) pin, the register will be clocked. tREQ ≥ 300 ns. tNSLH ≥ 200 ns. The user is advised to read from the SSI falling edge. Broadcom AEAT-8811-Q24-DS100 13 AEAT-8811-Q24 Data Sheet Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration Figure 8: SSI Protocol Timing Diagram Default: Data Output with 3-Wire SSI (SSI3 Mode), up to 10-MHz Clock Rates Symbol Description Min. Typ. Max. Unit tsw(SEL) SSI_SPI_SEL switch time 1 — — μs tREQ SCL high time between the NLS falling edge and first SCL falling edge 300 — — ns tREQ2 NSL low time after the rising edge of the last clock period for an SSI read 200 — — ns tNSLH NSL high time between two successive SSI reads 200 — — ns NOTE: CLK = 1 when inactive; DIN = 1 when inactive. Important: Make sure that CLK is high when switching between SSI and SPI modes. The SSI data format may vary depending on the different settings on absolute resolution (16 bits, 14 bits, 12 bits, or 10 bits). The total data length is shown in the following figure. The three-bit status is for Ready, MHI, and MLO. Configurable—Data readout with 2-wire SSI mode below: NSL must be held low upon power cycle (NSL high will turn the IC into the default SSI3 mode), up to 2-MHz clock rates. Symbol Description tsw(SEL) SSI_SPI_SEL switch time tClk NSL low time after the rising edge of the last clock period for an SSI read tM NSL high time between two successive SSI reads Broadcom Min. Typ. Max. Unit 1 — — μs 250 — tM/2 ns — 16.5 18.0 μs AEAT-8811-Q24-DS100 14 AEAT-8811-Q24 Data Sheet Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration User-programmable register option 3-wire SSI with initial data output tri-state (high impedance) to logic high to initiate the read-out, up to 10-MHz clock rates Symbol Description Min. Typ. Max. Unit tsw(SEL) SSI_SPI_SEL switch time 1 — — μs tREQ SCL high time between the NLS falling edge and the first SCL falling edge 300 — — ns tREQ2 NSL low time after the rising edge of the last clock period for an SSI read 200 — — ns tNSLH NSL high time between two successive SSI reads 200 — — ns Figure 9: SSI Output Format for Different Absolute Resolution Settings NOTE: Total data length: 16-b pos → 20-b, 14-b pos → 18-b, 12-b pos → 16-b, 10-b pos → 14-b 3-b status: {Ready, MHI, MLO} Magnet High (MHI) Error: This indicates that the magnet strength detected by the chip is too strong. When this is flagged high consistently, change to a weaker magnet or increase the distance between the chip and the magnet. The value for this alarm is represented as 1. Magnet Low (MLO) Error: This indicates that the magnet strength detected by the chip is too weak. When this is flagged high consistently, change to a stronger magnet or decrease the distance between the chip and the magnet. The value for this alarm is represented as 1. Ready: The chip is ready, and the ready value is 1. 1-b parity is even parity. Broadcom AEAT-8811-Q24-DS100 15 AEAT-8811-Q24 Data Sheet Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration PWM The PWM protocol uses one output pin (W_PWM) from the AEAT-8811-Q24. Note that the W_PWM pin is shared between the UVW and PWM protocols. The PWM signals are configurable to have a period of 1025, 2049, 4097, or 8193 μs. During power-up, the PWM signal is 0 before the chip is ready. Figure 10: PWM Signals (Period = 1025/2049/4097/8193 μs) Incremental Output Format The AEAT-8811-Q24 provides ABI and UVW signals to indicate the incremental position of the motor. ABI The ABI incremental interface is available to provide position data and direction data from the three output pins (A, B, and I). The index signal marks the absolute angular position and typically occurs once per revolution. The ABI signal is configurable using the memory map registers. It supports the following configuration: Programmable CPR: 32, 64, 128, 256, 512, 1024, 2048, or 4096 Programmable I-width: 90, 180, 270, or 360 electrical degrees (edeg) Broadcom AEAT-8811-Q24-DS100 16 AEAT-8811-Q24 Data Sheet Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration Figure 11: ABI Signal (4096 CPR, with Different I-Width Settings), Assuming User Sets Hysteresis at 0.02 Mechanical Degrees UVW Three-channel integrated commutation output (U, V, W) emulates Hall sensor feedback and is available using three output pins. Note that the W_PWM pin is shared between the UVW and PWM protocols. The AEAT-8811-Q24 can configure pole pairs from 1 to 8 (equivalent to 2 to 16 poles). Broadcom AEAT-8811-Q24-DS100 17 AEAT-8811-Q24 Data Sheet Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration Figure 12: UVW Signals (1 to 8 Pole Pairs) Broadcom AEAT-8811-Q24-DS100 18 AEAT-8811-Q24 Data Sheet Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration Note that signal U from the UVW protocol is tagged to signal I from the ABI protocol, as shown in the following figure. Figure 13: U-to-I Tagging Programming the AEAT-8811-Q24 The OTP shadow registers and internal registers are programmable using the SPI protocol. Writing specific commands to specific addresses of internal registers will program values of OTP shadow registers to OTP permanently. SPI Protocol The SPI protocol uses three pins from the AEAT-8811-Q24. These three pins are shared between the SSI and SPI protocols. SSI_SPI_sel (input pin) selects either protocol at a time. Assert 0 on SSI_SPI_sel to select the SPI protocol. The AEAT-8811-Q24 supports the SPI protocol from 10 kHz to 1 MHz. SSI_NSL_SPI_DIN → DIN (data in) signal for the SPI protocol, input to the AEAT-8811-Q24 SSI_SCL_SPI_CLK → CLK (clock) signal for the SPI protocol, input to the AEAT-8811-Q24 SSI_DO_SPI_DO → DO (data out) signal for the SPI protocol, output from the AEAT-8811-Q24 To read an address using SPI: DIN: ReadAddress; from 8 bits DIN SPI_DIN: WriteAddressData Write is specified as 2 bits (01) in the MSB of the address bus, followed by the 6-bit address, and lastly by the 8-bit data. NOTE: Broadcom The user should read back the data to confirm that the data was written successfully. AEAT-8811-Q24-DS100 20 AEAT-8811-Q24 Data Sheet Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration Figure 15: SPI Write Timing Diagram Symbol Description tsw(SEL) SSI_SPI_SEL switch time. thi(CLK) CLK high time after the end of the last clock period for an SPI read/write command. Min. Typ. Max. Unit 1 — — μs 300 — — ns NOTE: CLK = 1 when inactive; DIN = 1 when inactive. Important: Make sure that CLK is high when switching between SSI and SPI modes. Programming OTP via SPI Here are steps for permanently programming the OTP nonvolatile memory. Change the voltage at the VDDA pin to 5.6V ± 0.1V for OTP programming. See the memory map address as described in Memory Map. Broadcom AEAT-8811-Q24-DS100 21 Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration AEAT-8811-Q24 Data Sheet The following are details on register 0x10 to 0x13. Address Bit(s) Name Description Default 0x10 [7:0] Unlock Registers Write 0xAB to this address to unlock all OTP shadow 8'h0 registers and internal registers (except 0x00–0x03, 0x10, 0x11, 0x12, and 0x1B, which are not locked). 0x11 [7:0] Program Customer Reserved OTP (0x00, 0x01) Write 0xA1 to this address to program Customer Reserved OTP (0x00, 0x01) to OTP. 0x12 [7:0] Program ST Zero Reset OTP (0x02, 0x03) Write 0xA2 to this address to program ST Zero Reset 8'h0 OTP (0x02, 0x03) to OTP. 0x13 [7:0] Program Customer Configuration OTP (0x04, 0x05, 0x06) Write 0xA3 to this address to program Customer Configuration OTP (0x04, 0x05, 0x06) to OTP. 8'h0 8'h0 Package Drawings (in mm) Figure 16: AEAT-8811, 24 QFN Dimensions Broadcom AEAT-8811-Q24-DS100 22 Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration AEAT-8811-Q24 Data Sheet Dimension Reference REF Min. Nom. Max. A 0.8 0.85 0.9 A1 0 — 0.05 A2 0.203 REF — D 5 BSC — E 5 BSC — D2 3.2 3.25 3.3 E2 3.2 3.25 3.3 b 0.25 0.3 0.35 e 0.65 BSC — L 0.35 0.4 0.45 Dimension Tolerance aaa bbb ccc ddd eee fff 0.1 0.1 0.05 0.05 0.08 0.05 Recommended PCB Land Pattern (in mm) Figure 17: Land Pattern Dimension Broadcom AEAT-8811-Q24-DS100 23 Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration AEAT-8811-Q24 Data Sheet Figure 18: Recommended Lead-Free Solder Reflow Soldering Temperature Profile Product Ordering Information Ordering Part Number Product Description Package Delivery Form AEAT-8811-Q24 Programmable 16-bit rotary magnetic encoder QFN 24 leads, 5 mm × 5 mm Tube AEAT-8811-Q24TR Programmable 16-bit rotary magnetic encoder QFN 24 leads, 5 mm × 5 mm Tape and Reel OTP Programming Kit Ordering Information (Optional) Ordering Part Number Product Description HEDS-8999 AEAT-8811-Q24 Magnetic Encoder Programming Kit Broadcom AEAT-8811-Q24-DS100 24 AEAT-8811-Q24 Data Sheet Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration Packaging Information Tape cavity dimension Reel dimension Broadcom AEAT-8811-Q24-DS100 25 Broadcom, the pulse logo, Connecting everything, Avago Technologies, Avago, and the A logo are among the trademarks of Broadcom and/or its affiliates in the United States, certain other countries, and/or the EU. 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