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NXP Semiconductors TJA1082TT,112
- Part No.:
- TJA1082TT,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TJA1082TT,112.pdf
- Description:
- IC INTERFACE SPECIALIZED 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,650
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Product details
Overview
TJA1082TT,112 from NXP Semiconductors is a FlexRay node transceiver compliant with FlexRay Electrical Physical Layer V2.1 Rev. B and supporting V3.0.1 features. It provides differential transmit/receive capability between FlexRay protocol controller and physical bus at 2.5/5/10 Mbit/s, delivers ±8 kV ESD protection on bus pins, and operates in 14 V and 42 V automotive systems for ECU communication.
For engineers reviewing the TJA1082TT,112 datasheet, TJA1082TT,112 pinout, TJA1082TT,112 application, or TJA1082TT,112 equivalent, key selection considerations include its SPI-accessible status register, dual error indication modes (SPI/simple), remote wake-up via bus pattern or dedicated data frame, and fail-silent behavior with TXEN/BGE clamping detection.
Technical Context
The TJA1082TT,112 implements a dual-receiver architecture: a normal receiver active in Normal mode and a low-power receiver enabled in Standby mode for wake-up monitoring. Its transmitter supports DATA_0/DATA_1 differential signaling on BP/BM with bus guardian interface logic via BGE pin control.
It integrates three power modes-Normal, Standby, and Power-off-with state transitions governed by STBN, VCC/VIO undervoltage flags, and wake/error flag logic. Diagnostics include 11 status/error flags readable via 16-bit SPI (SCLK/SCSN/SDO) or indicated on ERRN pin, with latched flag behavior in SPI mode and immediate assertion in simple error indication mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rates | 2.5 Mbit/s, 5 Mbit/s, and 10 Mbit/s - enables flexible network timing design across automotive domain controllers |
| Bus voltage range | ±60 V differential between BP/BM and any other pin - ensures robustness against load dump and battery reversal |
| ESD protection | ±8 kV on BP/BM per IEC61000-4-2 and HBM - eliminates need for external TVS diodes in most layouts |
| Supply voltages | VCC = +5 V; VIO = −0.3 V to +5.5 V - supports level adaptation to host controller I/O voltage |
| Wake-up sensitivity | Detects wake-up patterns ≥2 consecutive symbols with DATA_0 > 870 ns and idle > 870 ns - enables reliable low-power bus monitoring |
| Fail-silent triggers | TXEN clamped if LOW > tdetCL(TXEN); BGE clamped if HIGH > tdetCL(BGE) - prevents erroneous transmission during fault conditions |
| Automotive qualification | AEC-Q100 Grade 1 (−40 °C to +125 °C junction) - certified for under-hood ECU deployment |
Pinout & Package
TJA1082TT,112 uses a TSSOP14 package (SOT402-1), 4.4 mm body width, 14-lead plastic thin shrink small outline package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIO (Pin 1) | Supply reference | Adapts digital I/O levels to host controller's VIO voltage; internal pull-down |
| TXD (Pin 2) | Transmit data input | Drives transmitter; internal pull-down ensures defined state when unconnected |
| TXEN (Pin 3) | Transmitter enable | Active-low enable; internal pull-up disables transmitter by default on power-up |
| RXD (Pin 4) | Receive data output | Direct output of normal receiver in Normal mode; reflects bus DATA_0/DATA_1/idle states |
| BGE (Pin 5) | Bus guardian enable | Active-low bus guardian control; internal pull-down disables guardian by default |
| STBN (Pin 6) | Mode control | Active-high Normal mode select; internal pull-down holds Standby on power-up |
| SCLK (Pin 7) | SPI clock | Drives 16-bit status register readout; internal pull-up ensures idle-high SPI timing |
| SDO (Pin 8) | SPI data output | Serial output of status bits S0–S15; high-impedance when SCSN = HIGH |
| SCSN (Pin 9) | SPI chip select | Active-low SPI enable; pull-up/pull-down configurable to enter simple error mode |
| ERRN (Pin 10) | Error/wake indicator | Open-drain active-low output; asserts for bus error, TEMP HIGH, UVVCC, UVVIO, or wake events |
| GND (Pin 11) | Ground reference | Common return path for analog/digital sections; decoupling critical for EMC performance |
| BM (Pin 12) | Bus line minus | Differential bus terminal; short-circuit proof to battery (14 V/42 V) and ground |
| BP (Pin 13) | Bus line plus | Differential bus terminal; withstands ±60 V differential to any other pin |
| VCC (Pin 14) | Main supply | +5 V supply for analog/digital core; undervoltage detection triggers automatic Standby entry |
Key Features
| Feature | Design Value |
|---|---|
| Auto I/O level adaptation | Eliminates level-shifter components by dynamically matching VIO to host controller supply |
| Dual error indication modes | Enables either full diagnostic visibility via SPI or minimal pin-count implementation using ERRN only |
| Remote wake-up support | Reduces system standby current by enabling bus-initiated exit from Standby without microcontroller intervention |
| Fail-silent bus driver | Prevents network corruption during faults via TXEN/BGE clamping and overtemperature shutdown |
| ISO 7637-2 transient immunity | Withstands automotive load dump (Pulse 1), jump-start (Pulse 2a), and capacitive coupling (Pulses 3a/3b) without external protection |
Applications
| Advanced Driver Assistance Systems (ADAS) | Powertrain Control Units (PCU) |
|---|---|
Use Scenario: High-integrity communication between radar ECU and central domain controller in autonomous driving architecture. IC Role / Device Role / Timing Role: FlexRay node transceiver providing deterministic, time-triggered data exchange at 10 Mbit/s with <60 ns bit time compliance. Use Value: Enables synchronized sensor fusion with sub-microsecond jitter control and built-in bus error detection to maintain functional safety integrity. | Use Scenario: Real-time torque coordination among engine, transmission, and hybrid inverter ECUs in xEV powertrains. IC Role / Device Role / Timing Role: Physical layer interface handling 5 Mbit/s FlexRay frames with dual-receiver wake-up capability for cold-start responsiveness. Use Value: Guarantees fail-silent operation during voltage transients and supports AEC-Q100 Grade 1 thermal range for under-hood reliability. |
| Chassis Control Systems | Body Electronics Gateways |
Use Scenario: Brake-by-wire and steer-by-wire ECUs requiring redundant, fault-tolerant communication with central chassis controller. IC Role / Device Role / Timing Role: Bus guardian-enabled transceiver enforcing strict timing boundaries via BGE pin control and TXEN clamping. Use Value: Prevents erroneous bus arbitration during ECU reset sequences and supports ISO 26262 ASIL-D system-level requirements. | Use Scenario: Gateway ECU aggregating FlexRay, CAN, and LIN traffic in premium vehicle architectures. IC Role / Device Role / Timing Role: Low-power FlexRay node managing periodic diagnostics and firmware updates while minimizing quiescent current in Standby mode. Use Value: Achieves <100 µA Standby current with remote wake-up, reducing parasitic drain on 12 V battery during vehicle sleep cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FlexRay transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TJA1083TT,112 | Includes enhanced power management: ultra-low Standby current (<10 µA), integrated watchdog timer, and extended VIO range (1.8 V to 5.5 V) | Better suited for always-on gateway modules requiring lowest possible sleep current and wider host I/O compatibility | Select TJA1083TT,112 when system-level power budget mandates sub-20 µA Standby or host uses 1.8 V/2.5 V logic |
| MC33664AEFR2 | Supports FlexRay V3.0.1 fully; adds embedded CRC generator/checker and programmable wake-up filter thresholds | Targeted at next-gen ADAS where protocol-layer enhancements reduce MCU processing overhead | Choose MC33664AEFR2 when migrating to V3.0.1-specific features like dynamic wake-up sensitivity or hardware CRC offload |
Compared with TJA1082TT,112, the TJA1083TT,112 reduces Standby current by >90 % and extends VIO compatibility downward to 1.8 V, while the MC33664AEFR2 adds protocol-aware diagnostics and V3.0.1 feature completeness - making each alternative optimal for distinct power, integration, or standards-compliance priorities.
Availability
TJA1082TT,112 is available at Aetrix Electronics and suitable for Advanced Driver Assistance Systems (ADAS), Powertrain Control Units (PCU), and Chassis Control Systems requiring stable component supply across automotive production lifecycles.
Supply support for TJA1082TT,112 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
NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in automotive networking IP.
The TJA1082TT,112 belongs to NXP's FlexRay transceiver product line, designed specifically for deterministic, fault-tolerant communication in safety-critical automotive ECUs operating under harsh electrical environments.
FAQ
What is the primary function of the TJA1082TT,112 in a FlexRay network?
The TJA1082TT,112 serves as the physical layer interface between a FlexRay protocol controller and the differential bus, providing bidirectional signal conversion, bus error detection, and power-mode management. It actively drives BP/BM lines during transmission and recovers DATA_0/DATA_1/idle states on RXD, while enabling remote wake-up and fail-silent behavior essential for automotive ECU reliability. The TJA1082TT,112 implements these functions within an AEC-Q100 Grade 1 qualified TSSOP14 package.
How does the TJA1082TT,112 handle undervoltage conditions on VCC or VIO?
The TJA1082TT,112 incorporates dedicated undervoltage detection circuits for both VCC and VIO. When VCC drops below Vuvd(VCC), the UVVCC flag sets and the transceiver automatically enters Standby mode; similarly, VIO undervoltage triggers the UVVIO flag and Standby entry. Both flags are reset only after voltage exceeds recovery thresholds (Vuvr(VCC)/Vuvr(VIO)) for trec(uv) duration. During undervoltage, ERRN asserts low and SPI access is disabled - ensuring predictable fault response. The TJA1082TT,112 maintains this behavior across all power modes.
Can the TJA1082TT,112 operate in both SPI diagnostic mode and simple error indication mode?
Yes, the TJA1082TT,112 supports two mutually exclusive error reporting modes. By default, it powers up in SPI mode, allowing full 16-bit status register readout via SCLK/SCSN/SDO. To switch to simple error indication mode, SCSN must be held LOW and SCLK held HIGH for >tdet(L)(SCLK); in this mode, ERRN directly reflects error/wake status without SPI access. The TJA1082TT,112 enforces mode persistence until reconfigured, and VIO undervoltage prevents mode switching. This dual-mode flexibility accommodates both high-diagnostic and pin-constrained designs.
What wake-up mechanisms does the TJA1082TT,112 support in Standby mode?
In Standby mode, the TJA1082TT,112 activates its low-power receiver to monitor the bus for valid wake-up patterns or dedicated FlexRay data frames. A wake-up pattern requires ≥2 consecutive symbols, each with DATA_0 > 870 ns followed by idle > 870 ns, all within 5 µs. Alternatively, a specific 36-byte payload (0xFF/0x00 sequences) emulates the pattern. Upon detection, the wake flag sets, ERRN goes LOW, and transition to Normal mode occurs if STBN is HIGH. The TJA1082TT,112 validates both methods per FlexRay V2.1 Rev. B and V3.0.1 specifications.
How does the TJA1082TT,112 ensure fail-silent operation during faults?
The TJA1082TT,112 guarantees fail-silent behavior through three coordinated mechanisms: (1) TXEN clamping disables transmission if TXEN remains LOW beyond tdetCL(TXEN); (2) BGE clamping detects prolonged HIGH on BGE to prevent bus guardian override; and (3) loss-of-ground forces Power-off mode with zero current leakage from digital inputs. Additionally, overtemperature detection disables the transmitter, and bus short-circuit detection (BP/BM to GND/VCC) sets the bus error flag. These actions ensure the TJA1082TT,112 never corrupts the FlexRay bus during fault conditions.
TJA1082TT,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- -
- Interface:
- FlexRay
- Voltage - Supply:
- 4.75V ~ 5.25V
- Supplier Device Package:
- 14-TSSOP
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
TJA1082TT,112 FAQ
1.How can I place an order for TJA1082TT,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for TJA1082TT,112 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 TJA1082TT,112 reliable?
The price and inventory of TJA1082TT,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TJA1082TT,112 is usually 5 days.
3.What payment methods are accepted for TJA1082TT,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TJA1082TT,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TJA1082TT,112?
TJA1082TT,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TJA1082TT,112 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 TJA1082TT,112?
For technical support, including TJA1082TT,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TJA1082TT,112 requirements.
6.How does Aetrix verify that TJA1082TT,112 is sourced from the original manufacturer or authorized distributors?
All TJA1082TT,112 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 TJA1082TT,112 meets industry standards.
7.What is the process for return or replacement of TJA1082TT,112?
All TJA1082TT,112 units undergo pre-shipment inspection (PSI). If there is an issue with TJA1082TT,112, 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 TJA1082TT,112 part is unused and in its original packaging.
Return procedure for TJA1082TT,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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