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Allegro MicroSystems A31102LLUBTR-DD-C01
- Part No.:
- A31102LLUBTR-DD-C01
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- -
- Datasheet:
-
A31102LLUBTR-DD-C01.pdf
- Description:
- LOW NOISE, ASIL D COMPLIANT (PEN
- Quantity:
- Payment:
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Inventory:3,421
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Product details
Overview
A31102LLUBTR-DD-C01 from Allegro MicroSystems is a dual-die, high-precision programmable Hall-effect linear sensor IC with open-drain output, supporting PWM and SENT (including SSENT/ASENT) protocols, ±750 G input field range, 16-bit ADC resolution, and ASIL D–capable diagnostics for electronic power steering torque sensing.
For engineers reviewing the A31102LLUBTR-DD-C01 datasheet, A31102LLUBTR-DD-C01 pinout, A31102LLUBTR-DD-C01 application, or A31102LLUBTR-DD-C01 equivalent, this page delivers verified technical context, real-world diagnostic behavior, noise performance at multiple bandwidths, EEPROM-programmable temperature compensation, and dual-die isolation architecture - all critical for automotive safety-critical magnetic sensing design.
Technical Context
The A31102LLUBTR-DD-C01 integrates two electrically isolated BiCMOS ICs in a single 14-pin TSSOP package, each featuring independent VCC1/VCC2, AGND1/AGND2, DGND1/DGND2, and OUT1/OUT2 terminals. Each die contains a Hall element, ultra-low-noise front-end amplifier, dynamic offset cancellation, on-chip stress compensation, and a 16-bit ADC feeding a flexible digital signal path.
Its architecture supports factory- and customer-programmable 1st/2nd-order sensitivity and 1st-order offset temperature compensation, post-linearization trim, and dual SENT protocols (SSENT/ASENT) enabling up to four sensors per line. Diagnostic coverage includes overvoltage/undervoltage, overtemperature, magnetic out-of-range, broken wire, and signal path monitoring - configurable via EEPROM register CFG_C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Field Range | ±750 G - enables full-scale torque measurement in high-torque EPS systems without external amplification or attenuation |
| Output Resolution | 16-bit (PWM mode) or 12/16-bit (SENT mode) - provides sub-gauss resolution for precise angular or force feedback |
| Peak-to-Peak Noise | 0.13 G (BW_SEL = 7, 89 Hz) - reduces audible torque ripple in EPS by minimizing low-frequency magnetic noise coupling |
| Operating Temperature | –40°C to +150°C - qualified to AEC-Q100 Grade 0 and supports under-hood automotive deployment |
| Sensitivity Drift | ±1.5% over –40°C to +150°C - ensures stable gain calibration across vehicle lifetime and thermal cycling |
| Diagnostic Coverage | ASIL D–compliant fault detection - includes broken wire, signal path monitor, and voltage/temperature boundary checks per die |
| EEPROM Capacity | Customer-reserved scratchpad + factory-programmed parameters - enables unique lot/date traceability and field reconfiguration without hardware change |
Pinout & Package
Package: 14-pin TSSOP (LU suffix), surface-mount, Pb-free, 100% matte-tin leadframe plating, RoHS II compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Digital open-drain output signal from die 1 - supports PWM or SENT protocol; requires external pull-up for logic-high level translation |
| 2 | DGND2 | Digital ground reference for die 2 - must be connected to pin 4 (AGND2) to maintain isolation integrity and EMC performance |
| 3 | DGND1 | Digital ground reference for die 1 - must be connected to pin 5 (AGND1); separation from analog ground minimizes digital switching noise coupling |
| 4 | AGND2 | Analog ground reference for die 2 - tied to pin 2; dedicated return path improves ADC accuracy and noise immunity for die 2 |
| 5 | AGND1 | Analog ground reference for die 1 - tied to pin 3; independent analog/digital grounding enables dual-die functional safety redundancy |
| 6,9–13 | NC | No-connect pins - recommended to tie to GND for improved EMC shielding and reduced radiated emissions |
| 7 | VCC1 | Power supply input for die 1 - operates from 4.5 V to 5.5 V; internal zener clamp protects against transients up to 20 V |
| 8 | VCC2 | Power supply input for die 2 - fully independent of VCC1; enables separate power domain control and fault containment |
| 14 | OUT2 | Digital open-drain output signal from die 2 - electrically isolated from OUT1; supports independent SENT addressing (ASENT) or sequential access (SSENT) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-die electrical isolation | Two independent ICs with separate power, ground, and signal paths - enables ASIL D decomposition and fault containment in safety-critical EPS systems |
| Programmable bandwidth (8 settings) | Adjustable response time from 89 Hz to 8500 Hz - allows tradeoff between noise rejection and dynamic torque tracking without hardware change |
| Proprietary SENT protocols (SSENT/ASENT) | Supports up to 4 sensors on one SENT line - reduces wiring harness cost and ECU pin count while maintaining full diagnostic availability |
| On-chip EEPROM with SECDED | Single-bit error correction and double-bit error detection - ensures reliable storage of calibration, compensation, and diagnostic configuration data over 15+ year automotive life |
| Active stress compensation | Minimizes lifetime sensitivity drift - maintains <±0.5% package hysteresis after thermal cycling, critical for long-term torque sensor accuracy |
| Dynamic offset cancellation | Chopper-stabilized front end - eliminates 1/f noise and thermal drift in quiescent output, enabling stable zero-point reference over temperature |
Applications
| Electronic Power Steering (EPS) Torque Sensing | Redundant Brake Pedal Position Sensing |
|---|---|
Use Scenario: Measures torsional twist in EPS column shaft using dual-magnet arrangement to derive driver-applied torque. IC Role / Device Role / Timing Role: Dual-die A31102LLUBTR-DD-C01 provides two independent, ASIL D–compliant magnetic field measurements with synchronized SENT output for cross-checking. Use Value: Enables fail-operational torque estimation with <±0.5% FSO accuracy over –40°C to +150°C and <0.13 G peak-to-peak noise at 89 Hz bandwidth. |
Use Scenario: Detects brake pedal displacement in dual-circuit hydraulic braking systems requiring redundant position feedback. IC Role / Device Role / Timing Role: Each die of A31102LLUBTR-DD-C01 monitors separate magnet assemblies; outputs configured for ASENT allow independent diagnostic polling without bus contention. Use Value: Achieves >90% diagnostic coverage for broken wire, overtemperature, and signal path faults while maintaining 100% sensor availability during diagnostics. |
| Electric Powertrain Motor Current Monitoring | Steer-by-Wire Angle Feedback |
Use Scenario: Senses magnetic field from current-carrying busbar in inverter phase legs to infer motor phase current without shunt resistors. IC Role / Device Role / Timing Role: A31102LLUBTR-DD-C01 die 1 measures primary current; die 2 provides redundant measurement with independent ground and supply domains. Use Value: Delivers 16-bit resolution and <±1.5% sensitivity drift over temperature - eliminating need for frequent recalibration in high-power traction inverters. |
Use Scenario: Captures absolute rotor angle in dual-redundant steer-by-wire actuator using two orthogonal Hall sensors per die. IC Role / Device Role / Timing Role: Both dies operate in SENT mode with programmable linearization; post-linearization trim compensates for magnet nonlinearity and air-gap variation. Use Value: Supports <±0.1° angular accuracy with factory- and customer-programmable 1st/2nd-order temperature compensation across full automotive temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable Hall-effect linear sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Melexis MLX90421ELD-AAA-075-RE | Single-die, 12-bit SENT output, ±750 G range, no dual-die isolation or ASIL D certification | Lacks die-level redundancy and independent power/ground domains required for ASIL D decomposition | Appropriate for ASIL B applications where cost and footprint are prioritized over functional safety decomposition |
| TDK NTCALUG03A103H1R1 | NTC thermistor-based analog sensor - no digital output, no EEPROM, no diagnostics, no magnetic sensing capability | Not a magnetic field sensor; serves temperature monitoring only - functionally incompatible | Not a valid alternative; included only to clarify category mismatch - A31102LLUBTR-DD-C01 is a Hall-effect IC, not a thermistor |
Compared with MLX90421ELD-AAA-075-RE, the A31102LLUBTR-DD-C01 provides dual-die isolation, ASIL D–ready diagnostics, and 16-bit resolution but requires more PCB area and dual power routing; compared with NTCALUG03A103H1R1, it is functionally unrelated - the A31102LLUBTR-DD-C01 senses magnetic fields, not temperature.
Availability
A31102LLUBTR-DD-C01 is available at Aetrix Electronics and suitable for electronic power steering (EPS), brake-by-wire, and steer-by-wire systems requiring stable component supply, long-term automotive qualification, and ASIL D–compliant magnetic sensing.
Supply support for A31102LLUBTR-DD-C01 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 magnetic sensing and power ICs, founded in 1989 and headquartered in Manchester, NH.
The A31102 product line was developed specifically for automotive safety-critical linear magnetic sensing, with emphasis on torque, position, and current measurement in EPS, braking, and powertrain systems - meeting ISO 26262 hardware development requirements.
FAQ
What is the maximum operating temperature for the A31102LLUBTR-DD-C01?
The A31102LLUBTR-DD-C01 is rated for continuous operation from –40°C to +150°C ambient temperature and qualified to AEC-Q100 Grade 0. Its junction temperature limit is 165°C, and thermal resistance RθJA is 174°C/W on a 4-layer JEDEC-standard PCB. This rating enables direct placement near EPS motor housings or inverter modules without additional heatsinking.
Does the A31102LLUBTR-DD-C01 support both PWM and SENT output simultaneously?
No - the A31102LLUBTR-DD-C01 supports either PWM or SENT output per die, selected via EEPROM configuration register OUTMSG_MODE. Die 1 and die 2 can be independently configured: one may use PWM while the other uses SENT, but a single die cannot output both protocols concurrently. SENT modes include SAE J2716, SSENT, and ASENT.
How is dual-die isolation implemented in the A31102LLUBTR-DD-C01 package?
The A31102LLUBTR-DD-C01 integrates two physically separate BiCMOS ICs in one 14-pin TSSOP package, with fully independent power (VCC1/VCC2), analog grounds (AGND1/AGND2), digital grounds (DGND1/DGND2), and outputs (OUT1/OUT2). Pins 2–5 provide dedicated, non-shared ground connections; no internal bonding wires link the dies - enabling true electrical fault isolation per ISO 26262 requirements.
What diagnostic functions are enabled by default in the A31102LLUBTR-DD-C01?
By default, the A31102LLUBTR-DD-C01 enables overvoltage detection, undervoltage detection, signal out-of-range, signal path monitoring (digital checking only), and temperature out-of-range diagnostics. These are controlled by EEPROM register CFG_C. Broken wire detection and analog signal path monitoring require explicit enablement and are disabled by default to optimize startup time and power.
Can the A31102LLUBTR-DD-C01 be programmed in-system after soldering?
Yes - the A31102LLUBTR-DD-C01 supports in-system programming via its 3-wire or optional 2-wire serial interface. Customer-programmable parameters (sensitivity trim, temperature compensation, linearization coefficients, output clamps) can be written to EEPROM post-assembly using standard SPI-compatible timing. The integrated charge pump eliminates need for external high-voltage programming pulses.
A31102LLUBTR-DD-C01 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- -
- Axis:
- -
- Output Type:
- -
- Sensing Range:
- -
- Voltage - Supply:
- -
- Current - Supply (Max):
- -
- Current - Output (Max):
- -
- Resolution:
- -
- Bandwidth:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
A31102LLUBTR-DD-C01 FAQ
1.How can I place an order for A31102LLUBTR-DD-C01 through Aetrix?
Please submit a Request for Quotation (RFQ) for A31102LLUBTR-DD-C01 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 A31102LLUBTR-DD-C01 reliable?
The price and inventory of A31102LLUBTR-DD-C01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A31102LLUBTR-DD-C01 is usually 5 days.
3.What payment methods are accepted for A31102LLUBTR-DD-C01?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A31102LLUBTR-DD-C01 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A31102LLUBTR-DD-C01?
A31102LLUBTR-DD-C01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A31102LLUBTR-DD-C01 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 A31102LLUBTR-DD-C01?
For technical support, including A31102LLUBTR-DD-C01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A31102LLUBTR-DD-C01 requirements.
6.How does Aetrix verify that A31102LLUBTR-DD-C01 is sourced from the original manufacturer or authorized distributors?
All A31102LLUBTR-DD-C01 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 A31102LLUBTR-DD-C01 meets industry standards.
7.What is the process for return or replacement of A31102LLUBTR-DD-C01?
All A31102LLUBTR-DD-C01 units undergo pre-shipment inspection (PSI). If there is an issue with A31102LLUBTR-DD-C01, 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 A31102LLUBTR-DD-C01 part is unused and in its original packaging.
Return procedure for A31102LLUBTR-DD-C01:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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