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Allegro MicroSystems AAS33051LLEATR-5
- Part No.:
- AAS33051LLEATR-5
- Manufacturer:
- Allegro MicroSystems
- Category:
- Angle, Linear Position Measuring
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AAS33051LLEATR-5.pdf
- Description:
- ASIL ANGLE SENSOR W/ LIN. & TURN
- Quantity:
- Payment:
- Shipping:
Inventory:1,173
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Product details
Overview
AAS33051LLEATR-5 from Allegro MicroSystems is a contactless 360° magnetic angle sensor IC based on Circular Vertical Hall (CVH) technology, delivering 12-bit SPI and PWM angular position output with ±0.4° typical angle error at 25°C, 300 G field, and supporting motor commutation (UVW) or incremental encoder (A/B/I) outputs. It targets automotive electronic power steering (EPS), transmission actuators, and BLDC pump control.
For engineers reviewing the AAS33051LLEATR-5 datasheet, AAS33051LLEATR-5 pinout, AAS33051LLEATR-5 application, or AAS33051LLEATR-5 equivalent, key selection considerations include its 5.0 V interface compatibility, ASIL B safety qualification (single-die version), 14-pin TSSOP package, on-chip 32-segment linearization, and support for low-power mode with turns counter functionality.
Technical Context
The AAS33051LLEATR-5 implements a dual-path signal chain: CVH front-end sensing with high-speed ADC sampling, followed by digital signal processing including on-chip 32-segment linearization, offset/gain correction, and direction inversion. Its SoC architecture integrates EEPROM (100-cycle endurance, ECC), SPI with 4-bit CRC, and configurable ABI/UVW/PWM outputs.
It supports ISO 26262-compliant safety integration as a Safety Element out of Context (SEooC), with diagnostics including logic BIST, CVH self-test, watchdog timers, and signal path monitoring. The device operates across –40°C to 150°C and accepts 3.7–18 V supply, with reverse battery protection up to –18 V and ISO 7637-2 Pulse 5b tolerance to 39 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Angle Resolution | 12-bit SPI/PWM output; 15-bit SPI optional (no error flags); enables sub-degree position control in EPS and BLDC systems. |
| Angle Accuracy | ±0.4° typical error at 25°C, 300 G, ideal alignment; improves to <±0.7° at 150°C with on-chip linearization. |
| Interface Voltage | 5.0 V logic compatible (VIH = 3.75 V min, VOH = 4.0 V min); eliminates level-shifting in 5 V microcontroller systems. |
| Supply Range | 3.7–18 V operation; withstands automotive battery transients up to 28 V continuous and 39 V ISO 7637-2 Pulse 5b. |
| Operating Temp | –40°C to 150°C ambient; qualified per AEC-Q100 Grade 0, enabling placement near motors and gearboxes. |
| Package | 14-pin TSSOP (LE suffix), 1 mm thin profile; minimizes air gap to target magnet for higher field strength and SNR. |
| Safety Rating | Designed as SEooC for ASIL B compliance (single-die); requires system-level control per AAS33051 Safety Manual. |
Pinout & Package
Package: 14-pin TSSOP (LE), lead-free, 100% matte-tin plating, 1 mm profile, exposed thermal pad not present (dual-die eTSSOP only).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BYP_1 | Internal regulator bypass | Connects 0.1 µF capacitor to stabilize internal 3.3 V LDO; VBYP = 3.3 V ±0.33 V at 25°C. |
| VCC_1 | Main power supply | Accepts 3.7–18 V; powers all internal circuits including CVH, ADC, and digital core. |
| GND | Ground reference | Three dedicated pins (5,6,7) ensure low-impedance return path for analog and digital domains. |
| CS_1 | SPI chip select | Active-low input; initiates SPI frame; tCS = 50 ns min setup to SCLK falling edge. |
| SCLK_1 | SPI clock input | Supports up to 10 MHz; duty cycle 40–60%; enables low-latency angle reads (<1.6 µs total latency at 10 MHz). |
| MOSI_1 | SPI data input | Configures registers, writes EEPROM; also serves as Manchester address pin. |
| MISO_1 | SPI data output | Reads angle, diagnostics, status; includes 4-bit CRC for error detection. |
| PWM_1 | Pulse-width modulated output | Duty cycle proportional to angle (5–95% range); clamped for fault indication per Table 2. |
| A_1/U_1 | Quadrature A or U-phase output | Selectable ABI or UVW mode; 10 µs response time; supports high-resolution motor commutation. |
| B_1/V_1 | Quadrature B or V-phase output | Complements A_1/U_1; phase-shifted by 90° (ABI) or 120° (UVW) for precise rotor position tracking. |
| I_1/W_1 | Index or W-phase output | Provides absolute zero-reference pulse (ABI) or third commutation phase (UVW). |
| WAKE_1 | External wake-up input | Low-power mode exit trigger; enables fast resumption of angle measurement without full power cycle. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 32-segment linearization | Compensates for magnet-to-sensor misalignment and imperfect magnetization, reducing angle error by >50% in real-world EPS assemblies. |
| ASIL B–ready SEooC architecture | Includes LBIST, CVH self-test, oscillator watchdogs, and signal path diagnostics-enabling integration into ISO 26262-compliant EPS ECUs. |
| Low-power mode with turns counter | Draws 76 µA avg at 25°C/5 V; retains motor position across ignition cycles via nonvolatile turns register, eliminating need for external backup power. |
| Multi-format outputs (SPI/PWM/ABI/UVW) | Enables flexible system partitioning: SPI for diagnostics and calibration, PWM for fast initial position, ABI/UVW for real-time commutation-all simultaneously active. |
| EEPROM with ECC | Stores factory and customer calibration parameters; single-bit error correction and dual-bit detection ensure robustness over 100 write cycles in harsh automotive environments. |
Applications
| Electronic Power Steering (EPS) | Transmission Actuator Control |
|---|---|
Use Scenario: Measuring steering column torque and angle for assist motor control in 12 V automotive platforms. IC Role / Device Role / Timing Role: Primary 360° angle sensor providing real-time rotor position to EPS ECU for field-oriented control (FOC) of brushless assist motor. Use Value: ±0.4° accuracy and 10 µs ABI latency enable smooth, responsive steering feel; 150°C rating allows direct mounting on motor housing. | Use Scenario: Detecting gear selector position and actuator shaft rotation in automatic transmission shift-by-wire systems. IC Role / Device Role / Timing Role: Redundant angle sensor feeding position feedback to transmission control module for closed-loop actuator positioning. Use Value: On-chip linearization compensates for mechanical tolerances in gear train assembly; ASIL B readiness supports functional safety requirements. |
| BLDC Pump Motor Commutation | Electric Parking Brake (EPB) |
Use Scenario: Providing rotor position feedback for 3-phase BLDC coolant or oil pumps in engine bay applications. IC Role / Device Role / Timing Role: UVW output drives gate driver ICs directly; SPI provides diagnostic data for pump health monitoring. Use Value: 5.0 V interface matches common pump MCU I/O; 1 mm TSSOP minimizes air gap to small-diameter magnets used in compact pump housings. | Use Scenario: Monitoring caliper motor position during parking brake engagement and release in ADAS-equipped vehicles. IC Role / Device Role / Timing Role: Dual-redundant angle sensing (via AAS33051LLEATR-5 + companion die or separate IC) for fail-operational EPB control. Use Value: Low-power mode retains last known position when vehicle is off; turns counter prevents loss of absolute position after multiple rotations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar angle sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AAS33051LLPBTR-5 | Dual-die 24-pin eTSSOP; supports ASIL D via redundant channel architecture; includes second SPI interface (die 2) and thermal sensor. | Required where hardware redundancy is mandated (e.g., steer-by-wire); not pin-compatible with AAS33051LLEATR-5 due to different pin count and layout. | Select AAS33051LLPBTR-5 when ASIL D compliance or dual-channel diagnostics are required; AAS33051LLEATR-5 suffices for ASIL B single-channel use cases. |
| A1339LLETR-5 | Legacy Allegro angle sensor; no on-chip linearization; 10-bit resolution; lacks turns counter and low-power mode; same 14-pin TSSOP footprint. | Used in cost-sensitive, non-safety-critical applications where <±1.5° accuracy is acceptable and position retention across power cycles is unnecessary. | A1339LLETR-5 offers drop-in PCB replacement but sacrifices accuracy, diagnostics, and power efficiency; upgrade to AAS33051LLEATR-5 for next-gen EPS/EPB designs. |
Compared with AAS33051LLPBTR-5, the AAS33051LLEATR-5 reduces board space and BOM cost while meeting ASIL B; versus A1339LLETR-5, it adds linearization, turns counting, and enhanced diagnostics-justifying migration in safety-critical or feature-rich automotive systems.
Availability
AAS33051LLEATR-5 is available at Aetrix Electronics and suitable for electronic power steering (EPS), transmission actuator control, and BLDC pump motor commutation requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100 qualification.
Supply support for AAS33051LLEATR-5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Allegro MicroSystems is a U.S.-based designer and manufacturer of high-performance Hall-effect sensors and power ICs, headquartered in Manchester, NH, with global manufacturing and test facilities.
The AAS33051 product line delivers programmable, safety-ready angle sensing for automotive electrification-specifically engineered for EPS, EPB, transmission, and electric pump applications demanding high accuracy, reliability, and functional safety compliance.
FAQ
What is the operating voltage range for the AAS33051LLEATR-5?
The AAS33051LLEATR-5 operates from 3.7 V to 18 V supply voltage, with absolute maximum rating of 28 V continuous. It supports ISO 7637-2 Pulse 5b transients up to 39 V, making it suitable for direct connection to 12 V automotive batteries. The internal regulator generates stable 3.3 V for core logic, referenced to the BYP_1 capacitor.
Does the AAS33051LLEATR-5 support functional safety standards?
Yes, the AAS33051LLEATR-5 is developed as a Safety Element out of Context (SEooC) per ISO 26262, targeting ASIL B compliance for single-die configurations. It includes logic BIST, CVH self-test, oscillator watchdogs, and signal path diagnostics. Full ASIL B implementation requires adherence to the AAS33051 Safety Manual and appropriate system-level control architecture.
How does the on-chip 32-segment linearization improve accuracy in the AAS33051LLEATR-5?
The AAS33051LLEATR-5's 32-segment linearization corrects for systematic errors caused by magnet-to-sensor misalignment and non-uniform magnetization. By applying per-segment gain/offset corrections stored in EEPROM, it reduces typical angle error from >±1.5° to ±0.4° at 25°C, significantly improving position fidelity in mechanically constrained EPS and transmission assemblies.
Can the AAS33051LLEATR-5 retain motor position during vehicle power-off?
Yes, the AAS33051LLEATR-5 features a low-power mode drawing just 76 µA at 25°C/5 V and an integrated turns counter. This allows it to track absolute rotor position across ignition cycles without external backup power, eliminating the need for volatile RAM or supercapacitors in EPB and pump applications.
What output interfaces does the AAS33051LLEATR-5 support, and how are they configured?
The AAS33051LLEATR-5 supports SPI (10 MHz max), PWM (98 Hz–3.125 kHz), and selectable ABI or UVW outputs-all simultaneously active. Configuration is performed via SPI registers or Manchester interface over VCC/PWM pins. ABI/UVW resolution, PWM frequency, and linearization settings are stored in on-chip EEPROM for persistent operation after power cycle.
AAS33051LLEATR-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- For Measuring:
- Angle
- Technology:
- Hall Effect
- Rotation Angle - Electrical, Mechanical:
- 0° ~ 360°
- Linear Range:
- -
- Output:
- PWM
- Output Signal:
- Clockwise Increase
- Actuator Type:
- External Magnet, Not Included
- Linearity:
- -
- Resistance:
- -
- Resistance Tolerance:
- -
- Voltage - Supply:
- 3.7V ~ 18V
- Mounting Type:
- Surface Mount
- Termination Style:
- SMD (SMT) Tab
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-TSSOP
AAS33051LLEATR-5 FAQ
1.How can I place an order for AAS33051LLEATR-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AAS33051LLEATR-5 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AAS33051LLEATR-5 reliable?
The price and inventory of AAS33051LLEATR-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AAS33051LLEATR-5 is usually 5 days.
3.What payment methods are accepted for AAS33051LLEATR-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AAS33051LLEATR-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AAS33051LLEATR-5?
AAS33051LLEATR-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AAS33051LLEATR-5 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AAS33051LLEATR-5?
For technical support, including AAS33051LLEATR-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AAS33051LLEATR-5 requirements.
6.How does Aetrix verify that AAS33051LLEATR-5 is sourced from the original manufacturer or authorized distributors?
All AAS33051LLEATR-5 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AAS33051LLEATR-5 meets industry standards.
7.What is the process for return or replacement of AAS33051LLEATR-5?
All AAS33051LLEATR-5 units undergo pre-shipment inspection (PSI). If there is an issue with AAS33051LLEATR-5, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AAS33051LLEATR-5 part is unused and in its original packaging.
Return procedure for AAS33051LLEATR-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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