AEAT-9922 BOARDCOM | Alldatasheet
Document overview
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Technical content
Features
5V and 3.3V operation Programmable 10 bits to 18 bits of absolute resolution Flexible Incremental ABI resolution ranging from 1 to 10,000 CPR Commutation angle output UVW 1 to 32 pole-pair PWM output modes with initialization and error bits option User-programmable zero position, direction, index width and index position Programmable hysteresis Absolute output over 2-wire SSI, 3-wire SSI, and 4-wire SPI. Each available in different mode. Compact QFN-24 leads (4 mm × 4 mm) package RoHS compliant INL angle correction for high accuracy 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 textiles equipment 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 solely liable for all loss, damage, expense, or liability in connection with such use. AEAT-9922 10-Bit to 18-Bit Programmable Angular Magnetic Encoder IC for On- and Off-Axis Applications
AEAT-9922 Data Sheet 10-Bit to 18-Bit Programmable Angular Magnetic Encoder IC for On- and Off-Axis Applications Functional Description Figure 1: AEAT-9922 Block Diagram The AEAT-9922 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 in 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 non-idealities before inputting them into the analog amplifiers for strength amplification and filtering. After which, the amplified analog signals are then 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. The used magnet should have sufficient magnetic field strength mT to generate the magnetic field for the signal generation (see Recommended Magnetic Input Specifications). The device provides digital information of magnetic field strength high MHi and magnetic field strength low MLo from output protocols to indicate whether the magnets are too close or too far away from our device’s surface. Users can access the device’s digitized absolute data using standard Synchronous Serial Interface (SSI) or Serial Peripheral Interface (SPI) protocols. In addition, an absolute angular representation also can be selected using a pulse width modulated (PWM) signal. The incremental outputs are available from digital outputs of their dedicated A, B, and I pins. The U, V, and W commutation outputs are switchable on the general I/O pins.
AEAT-9922 Data Sheet 10-Bit to 18-Bit Programmable Angular Magnetic Encoder IC for On- and Off-Axis Applications Pin Assignment Figure 2: Pin Configurations Pinout Description Pin QFN24 Pin Name I/O Type Functional Description 1 to 6 NC — — No Connection 7 VDDA — Power 3.3V/5V Supply Input (Analog)
8 VSSA — Power Supply Ground (Analog)
9 M0 I/O Digital SPI3 and SSI Selection/SPI Chip Select/ERR Output
10 M1 I/O Digital SPI Data Input/SSI NSL Pin/U Commutation Output (UVW)
11 M2 I/O Digital SPI/SSI Clock Input/V Commutation Output (UVW)
12 M3 O Digital SPI/SSI Data Out/W Commutation Output (UVW)/PWM Output
13 to 18 NC — — No Connection
19 MSEL I Digital Mode Selection
20 I O Digital Incremental Index Output (ABI)
21 VDD — Power 3.3V/5V Supply Input (Digital)
22 VSS — Power Supply Ground (Digital)
23 B O Digital Incremental B Output (ABI)
24 A O Digital Incremental A Output (ABI)
25 VSS — Power Supply Ground
AEAT-9922 Data Sheet 10-Bit to 18-Bit Programmable Angular Magnetic Encoder IC for On- and Off-Axis Applications
Electrical Characteristics
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. Recommended Operating Conditions Table 1: Maximum Rating Parameter Symbol Min. Max. Units Notes Storage Temperature TS –40 125 °C DC Supply Voltage VDDA Pin VDD –0.3 6 V Input Voltage Range Vin –0.3 6 V Electrostatic Discharge (HBM) –4.0 +4.0 kV Moisture Sensitivity Level — 1 Table 2: Recommended Operating Conditions for the Encoder IC Parameter Symbol Min. Typ. Max. Units Notes Operating Ambient Temperature T A –40 — 125 °C DC Supply Voltage to VDD Pin 5V Operation 3.3V Operation VDD 4.5 3.0 5.0 3.3 5.5 3.6 V Incremental Output Frequency f MAX — — 1.0 MHz Frequency = Velocity(rpm) × CPR/60 Load Capacitance CL — — 15 pF
AEAT-9922 Data Sheet 10-Bit to 18-Bit Programmable Angular Magnetic Encoder IC for On- and Off-Axis Applications Systems Parameters NOTE: Electrical characteristics over the recommended operating conditions. Typical values specified at VDD = 5.0V and 25°C, at optimum placement of magnet. Table 3: Systems Parameters Parameter Symbol Min. Typ. Max. Units Notes Current Consumption Supply Current Normal Operation Mode IDD — 25 — mA 5V IDD — 24 — mA 3.3V Digital Outputs (DOs) High Level Output Voltage VOH VDD – 0.5 — — V Normal operation Low Level Output Voltage VOL — — GND + 0.4 V Power-Up Time Absolute Output Incremental Output PWM Output tPwrUp — 10 — ms Digital Inputs (DIs) Input High Level VIH 0.7 × VDD — — V Input Low Level VIL — — 0.3 × VDD V Pull-Up Low Level Input Current I IL — — 120 µA Pull-Down High Level Input Current I IH — — 120 µA
AEAT-9922 Data Sheet 10-Bit to 18-Bit Programmable Angular Magnetic Encoder IC for On- and Off-Axis Applications Mechanical and Magnetic Specifications Recommended Magnetic Input Specifications Figure 3: Direction Definition When the Magnet Rotates Table 6: Magnet Specifications Parameter Symbol Min. Typ. Max. Units Notes Diameter Disc Magnet Ring Magnet ID /OD d ID,15 OD,25 mm mm mm Recommended magnet: Cylindrical magnet or ring magnet diametrically magnetized and 1-pole pair. Thickness Disc Magnet Ring Magnet t 2.5 mm mm Magnetic Input Field Magnitude On-Axis (Disc Magnet) Off-Axis (Ring Magnet) Bpk 100 150 mT mT Required vertical/horizontal component of the magnetic field strength on the die’s surface, measured along concentric circle. Magnet Displacement Radius R_m — — 0.25 mm Displacement between magnet axis to the device center. Recommended Magnet Material and Temperature Drift — –0.12 — %/K NdFeB (Neodymium Iron Boron), grade N35SH.
AEAT-9922 Data Sheet 10-Bit to 18-Bit Programmable Angular Magnetic Encoder IC for On- and Off-Axis Applications Figure 4: Diametrically Magnetized Magnet
AEAT-9922 Data Sheet 10-Bit to 18-Bit Programmable Angular Magnetic Encoder IC for On- and Off-Axis Applications Communication Protocol AEAT-9922 has a total of 10 interfaces; one is dedicated for incremental ABI and remaining are multiplexed to I/O pin M0, M1, M2, and M3. Each output is configurable using the M0 pin, the MSEL pin, and the PSEL registers as shown in the following table. NOTE: 1. PSEL[1] and PSEL[0] are configurable through memory. 2. MSEL, M0, M1, M2, and M3 are configurable through I/O pads. Figure 5: Interface Selection and IO Pins Table 7: Configurable interface IO and selection Pin Mode SPI-3 SSI-3(A) SSI-3(B) SSI-2(A) SSI-2(B) SPI-4(A) SPI-4(B) UVW PWM Remarks MSEL 0 0 0 0 0 1 1 1 1 I/O Pin PSEL[1] x x x x x 0 0 1 1 Memory PSEL[0] x 0 1 0 1 0 1 0 1 Memory M0 0 1 1 1 1 NCS NCS ERR ERR I/O Pin M1 DIN NSL NSL 0 0 MOSI MOSI U N/A I/O Pin M2 SCK SCL SCL SCL SCL SCK SCK V N/A I/O Pin M3 DO DO DO DO DO MISO MISO W PWM I/O Pin
AEAT-9922 Data Sheet 10-Bit to 18-Bit Programmable Angular Magnetic Encoder IC for On- and Off-Axis Applications SPI4 Protocol SPI4 protocol uses four pins from AEAT-9922. These four pins are shared between the UVW, SSI, and SPI protocols. MSEL (input pin) selects one of these protocols at a time. Assert 1 on the MSEL pin to select the SPI4 protocol. SPI4 protocols allow user to access memory read or write and position data. They use CPOL=0, CPHA=1 for triggering. M0 → SPI_Chip Select (NCS) signal for SPI protocol, input to AEAT-9922 M1 → SPI_Data Input (MOSI) signal for SPI protocol, input to AEAT-9922 M2 → SPI_Clock Input (SCK) signal for SPI protocol, input to AEAT-9922 M3 → SPI_Data Output (MISO) signal for SPI protocol, output from AEAT-9922 Figure 6: SPI4 Timing Diagram NOTE: The user should read back data to confirm data is written successfully. Table 8: SPI4 Timing Characteristics Symbol Description Min. Typ. Max. Units tL Time between NCS falling edge and CLK rising edge 350 — — ns tclk Serial clock period 100 — — ns tclkL Low period of serial clock 50 — — ns tclkH High period of serial clock 50 — — ns tH Time between last falling edge of SCK and rising edge of NCS t clk /2 — — ns tCSn High time of NCS between two transmission 350 — — ns tMOSI Data input valid to clock edge 20 — — ns tMISO SCK edge to data output valid — 51 — ns tOZ Time between NCS rising edge and MISO — 10 — ns
AEAT-9922 Data Sheet 10-Bit to 18-Bit Programmable Angular Magnetic Encoder IC for On- and Off-Axis Applications Figure 22: SSI2 Read Data Format NOTE: 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 the 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 the 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. Parity: 1-b parity is even parity.
AEAT-9922 Data Sheet 10-Bit to 18-Bit Programmable Angular Magnetic Encoder IC for On- and Off-Axis Applications Package Drawings Dimensions are in mm unless otherwise specified. Figure 29: AEAT-9922, 24 QFN Dimensions
AEAT-9922 Data Sheet 10-Bit to 18-Bit Programmable Angular Magnetic Encoder IC for On- and Off-Axis Applications Product Ordering Information Accessories Ordering Information Packaging Information Figure 32: Reel Dimensions Ordering Part Number Product Description Package Delivery Form AEAT-9922-100 18 Bits Magnetic Encoder On-Off Axis Tape and Reel, 1000 pieces QFN 24 leads, 4 mm × 4 mm Tape and Reel AEAT-9922-102 18 Bits Magnetic Encoder On-Off Axis Tape and Reel, 100 pieces QFN 24 leads, 4 mm × 4 mm Tape and Reel AEAT-9922-Q24 18 Bits Magnetic Encoder On-Off Axis Tube, 73 pieces QFN 24 leads, 4 mm × 4 mm Tube Ordering Part Number Product Description Remarks HEDS-9922PRGEVB AEAT-9922 Programming Kit, Evaluation Board and Magnet Evaluation Set 1 unit of SPI programming kit, 2 units of sensor board, 2 pieces of on-axis magnets, USB cable for PC interface and the associated software HEDS-9922EVB AEAT-9922 Evaluation Board 1 unit of sensor board
AEAT-9922 Data Sheet 10-Bit to 18-Bit Programmable Angular Magnetic Encoder IC for On- and Off-Axis Applications Broadcom AEAT-9922-DS105 Figure 35: AEAT-9922 Series Package Marking Table 13: AEAT-9922 Series Package Marking Row Length Description 1 9 digits Product part number 2 4 digits Manufacturing date code, “YY” is year, “WW” is work week 3 6 digits Wafer batch number
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