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Allegro MicroSystems A1332ELETR-T
- Part No.:
- A1332ELETR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Angle, Linear Position Measuring
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
A1332ELETR-T.pdf
- Description:
- SENSOR ANGLE 360DEG SMD
- Quantity:
- Payment:
- Shipping:
Inventory:2,169
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Product details
Overview
A1332ELETR-T from Allegro MicroSystems is a discontinued 360° contactless high-resolution programmable magnetic angle position sensor IC with I2C digital output, 12-bit resolution, 32 µs refresh rate, and automotive-grade operation from –40°C to 85°C - designed for end-of-shaft and off-axis angular measurement in electronic power steering (EPS) and transmission systems.
For engineers reviewing the A1332ELETR-T datasheet, A1332ELETR-T pinout, A1332ELETR-T application, or A1332ELETR-T equivalent, key selection considerations include its CVH-based sensing architecture, EEPROM-programmable linearization (harmonic/segmented), ±2° angle error at 300 G, temperature drift of ±2° over –40°C to 85°C, and TSSOP-14 package compatibility with I2C host interfaces operating at 3.3 V pull-up voltage.
Technical Context
The A1332ELETR-T implements a Circular Vertical Hall (CVH) analog front end coupled with a 32-bit microprocessor for real-time angle computation, supporting harmonic and segmented linearization algorithms stored in on-chip EEPROM with ECC. Its signal path includes 12-bit ADC sampling, configurable output rate (ORATE) from 32 µs to 4096 µs, and optional IIR filtering and temperature compensation.
It delivers calibrated angle data via open-drain I2C interface (SCL/SDA) with 400 kHz max clock frequency, requires external 1 kΩ pull-ups to 3.3 V, and uses dual ground domains (AGND/DGND) with dedicated BYP capacitor node for internal regulator stability - all within a single-die 14-pin TSSOP (LE) package rated for automotive ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Angle Resolution | 12-bit output (0–4095 code range), enabling 0.0879° quantization step for full 360° rotation |
| Refresh Rate | 32 µs minimum - supports high-speed EPS and transmission feedback loops requiring >30 kHz sampling |
| Operating Temp | –40°C to +85°C - qualified for passenger compartment and under-hood automotive applications |
| Magnetic Range | 300–1000 G - optimized for neodymium magnets (e.g., 10 mm × 4 mm sintered) at ≤2.7 mm airgap |
| Angle Accuracy | ±2° error (no linearization, ideal alignment, 300 G) - reduced further via EEPROM-stored harmonic coefficients |
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V automotive rails; includes VCC low-flag detection at 4.55 V typical |
| Interface | I2C open-drain, 400 kHz max - requires external 1 kΩ pull-ups to 3.3 V; SDA/SCL logic levels referenced to VPU = 3.3 V |
Pinout & Package
Package: 14-pin TSSOP (LE suffix), lead-free with 100% matte tin plating, 1 mm profile - suitable for automated SMT assembly and space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DGND (pins 1, 3, 9, 14) | Digital ground reference | Return path for I2C interface, microprocessor core, and EEPROM programming circuitry |
| AGND (pins 4, 7) | Analog ground reference | Isolated return for CVH sensor, analog front end, and ADC to minimize noise coupling |
| VCC (pins 5, 6) | Power supply input | 5 V nominal supply; also carries programming pulses for EEPROM write operations |
| BYP (pin 2) | Internal regulator bypass node | Must connect to DGND via 0.1 µF capacitor to stabilize internal 3.3 V digital regulator |
| SA0 / SA1 (pins 13, 12) | I2C slave address configuration | Set LSB/MSB of 7-bit address (default 0xC0); tie to BYP for '1', DGND for '0' |
| SCL (pin 11) | I2C clock input | Open-drain input; requires external 1 kΩ pull-up to 3.3 V; max 400 kHz clock frequency |
| SDA (pin 10) | I2C bidirectional data line | Open-drain output/input; transmits angle data and receives EEPROM programming commands |
| TEST (pin 8) | Factory test terminal | Mandatory connection to DGND for normal operation; floating or high impedances cause functional failure |
Key Features
| Feature | Design Value |
|---|---|
| Circular Vertical Hall (CVH) Sensing | Enables true 360° contactless angle measurement without mechanical wear or limited lifetime - immune to dust, oil, and vibration |
| EEPROM with ECC | Stores user-programmed linearization coefficients, gain/offset trims, and configuration bits with error correction to ensure calibration integrity over life |
| Harmonic & Segmented Linearization | Compensates geometric nonlinearity in off-axis applications (e.g., side-shaft EPS) - harmonic mode recommended for eccentric magnet placement |
| Configurable Output Rate (ORATE) | Adjusts trade-off between latency and effective resolution: 1 sample (32 µs) to 128 samples (4096 µs) averaged per output - selectable via EEPROM register |
| Temperature & Field Compensation | Reduces angle drift to ±1.5° over full temperature range using factory-loaded coefficients - TC bit enables/disables in firmware |
| Diagnostic Flag Reporting | Real-time status flags (UV, OV, MH, ML, AT, AHF, ALF) transmitted over I2C - enables system-level fault detection without external monitoring circuitry |
Applications
| Electronic Power Steering (EPS) | Transmission Gear Position Sensing |
|---|---|
Use Scenario: Mounted on steering column shaft to measure absolute steering angle for assist torque calculation and lane-keeping control. IC Role / Device Role / Timing Role: Primary 360° angle sensor providing real-time, high-bandwidth feedback to EPS ECU via I2C at ≥10 kHz update rate. Use Value: Enables precise torque overlay and active steering response with <±2° accuracy across –40°C to 85°C, supported by harmonic linearization for off-center magnet mounting. | Use Scenario: Integrated into automatic transmission valve body to detect gear selector position and rotational state of input/output shafts. IC Role / Device Role / Timing Role: Contactless angular transducer replacing potentiometers and resolvers - outputs calibrated 12-bit angle code synchronized to transmission control timing. Use Value: Eliminates mechanical wear and contact bounce; maintains ±2° accuracy despite thermal cycling and vibration, with EEPROM-trimmed offset/gain for long-term stability. |
| Torsion Bar Torque Sensing | Throttle Valve Position Feedback |
Use Scenario: Paired with dual magnets on torsion bar ends to infer steering torque from differential angle measurement. IC Role / Device Role / Timing Role: Dual-sensor subsystem element delivering synchronized angle readings to compute twist angle and torque magnitude. Use Value: Achieves sub-degree differential angle resolution using CVH technology and matched linearization - critical for accurate torque estimation in fail-operational EPS designs. | Use Scenario: Mounted on throttle body shaft to report pedal position and engine load demand to ECU in gasoline direct injection systems. IC Role / Device Role / Timing Role: High-reliability angular encoder providing failsafe position data with diagnostic flag reporting for ASIL-B compliance. Use Value: Supports functional safety requirements via built-in diagnostics (VCC low, field out-of-range, angle error flags) and EEPROM ECC-protected calibration data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar magnetic angle sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A1335LLETR-T | Successor device with enhanced 14-bit resolution, faster 20 µs refresh rate, extended –40°C to 150°C operation, and improved EMC robustness | Designed for next-generation EPS and x-by-wire systems requiring higher accuracy and wider temperature margin | Recommended for new designs; requires PCB layout review due to identical TSSOP-14 footprint but updated register map and programming protocol |
| AS5055A-DSOM | 12-bit Hall-based angle sensor with SPI interface, 30 µs conversion time, and integrated magnetic concentrator - no EEPROM programmability | Targeted at cost-sensitive industrial motor control where I2C is unavailable and fixed calibration suffices | Consider when I2C is not required and board space allows for larger SOIC-16 package; lacks harmonic linearization and EEPROM trim flexibility |
Compared with A1332ELETR-T, the A1335LLETR-T offers higher resolution and broader temperature capability while maintaining pinout compatibility, whereas the AS5055A-DSOM provides simpler SPI integration but sacrifices programmable linearization and automotive qualification depth.
Availability
A1332ELETR-T is available at Aetrix Electronics and suitable for legacy automotive repair, ECU remanufacturing, and industrial retrofit projects requiring stable component supply and documented discontinuation lifecycle support.
Supply support for A1332ELETR-T 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, motor drivers, and power ICs, serving automotive, industrial, and consumer markets since 1989.
The A1332 product line was developed specifically for high-accuracy, contactless angular position sensing in safety-critical automotive systems - emphasizing robustness, programmability, and field-proven reliability under harsh environmental conditions.
FAQ
Is the A1332ELETR-T still in production?
No, the A1332ELETR-T is a discontinued product. Allegro MicroSystems ceased production as of December 5, 2018, and no new orders are accepted for this part. It remains available through authorized distributors for legacy support and repair channels, but samples are no longer provided. Designers should migrate to the A1335LLETR-T for new applications.
What is the maximum operating temperature for the A1332ELETR-T?
The A1332ELETR-T is rated for an operating ambient temperature range of –40°C to +85°C. This E-grade specification is explicitly defined in the selection guide and validated across all electrical and magnetic performance parameters - including ±2° angle error and ±2° temperature drift at extremes - making it suitable for passenger compartment and moderate under-hood environments.
Does the A1332ELETR-T support both on-axis and off-axis magnetic configurations?
Yes, the A1332ELETR-T supports both on-axis (end-of-shaft) and off-axis (side-shaft) configurations. Its CVH architecture and dual linearization schemes - harmonic (recommended for off-axis) and segmented - compensate for geometric nonlinearity arising from magnet eccentricity or edge-field distortion, enabling accurate angle measurement even with misaligned 10 mm × 4 mm neodymium magnets at 2.7 mm airgap.
What I2C voltage levels are required for reliable communication with the A1332ELETR-T?
The A1332ELETR-T requires 3.3 V pull-up resistors on both SCL and SDA lines. Although the pins tolerate up to 5.5 V, connecting SDA/SCL directly to 5 V violates the I2C specification and forward-biases an internal diode, degrading regulator performance. Allegro specifies 1 kΩ pull-ups to 3.3 V, with VIH(I2C) = 2.1–3.63 V and VIL(I2C) = 0–0.9 V - ensuring robust noise margins in automotive ECU environments.
Can the A1332ELETR-T be reprogrammed after soldering to the PCB?
Yes, the A1332ELETR-T supports in-system EEPROM programming via its I2C interface and VCC pin pulsing, allowing calibration coefficient updates, linearization selection, and configuration changes post-assembly. Programming requires adherence to the EEPROM write sequence in the Programming Reference addendum, including proper VCC ramp timing and lock-bit management - all accessible without removing the device from the board.
A1332ELETR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- -
- For Measuring:
- Angle
- Technology:
- Hall Effect
- Rotation Angle - Electrical, Mechanical:
- 0° ~ 360°
- Linear Range:
- -
- Output:
- I2C
- Output Signal:
- -
- Actuator Type:
- External Magnet, Not Included
- Linearity:
- -
- Resistance:
- -
- Resistance Tolerance:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Mounting Type:
- Surface Mount
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-TSSOP
A1332ELETR-T FAQ
1.How can I place an order for A1332ELETR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1332ELETR-T 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 A1332ELETR-T reliable?
The price and inventory of A1332ELETR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1332ELETR-T is usually 5 days.
3.What payment methods are accepted for A1332ELETR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1332ELETR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1332ELETR-T?
A1332ELETR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1332ELETR-T 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 A1332ELETR-T?
For technical support, including A1332ELETR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1332ELETR-T requirements.
6.How does Aetrix verify that A1332ELETR-T is sourced from the original manufacturer or authorized distributors?
All A1332ELETR-T 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 A1332ELETR-T meets industry standards.
7.What is the process for return or replacement of A1332ELETR-T?
All A1332ELETR-T units undergo pre-shipment inspection (PSI). If there is an issue with A1332ELETR-T, 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 A1332ELETR-T part is unused and in its original packaging.
Return procedure for A1332ELETR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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