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Infineon Technologies TLE7729TXUMA1
- Part No.:
- TLE7729TXUMA1
- Manufacturer:
- Infineon Technologies
- Category:
- Specialized
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TLE7729TXUMA1.pdf
- Description:
- IC INTERFACE SPECIALIZED 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,916
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Product details
Overview
TLE7729TXUMA1 from Infineon Technologies is a 4-channel automotive satellite receiver IC for airbag ECUs, supporting up to eight inertial/pressure sensors via current-modulated twisted-pair links at 125 kBaud, with embedded Manchester (11-/13-/18-bit) protocol handling and four independent regulated satellite supplies (6 V / 11 V). It operates in front-, side-, and rear-crash detection systems.
For engineers reviewing the TLE7729TXUMA1 datasheet, TLE7729TXUMA1 pinout, TLE7729TXUMA1 application, or TLE7729TXUMA1 equivalent, key selection criteria include channel pairing mode (Bus Mode), synchronous/asynchronous data transmission support, per-channel over-temperature shutdown, leakage/short/open diagnostics on reference pins, and SPI interface compatibility with 3.3 V/5 V MCUs.
Technical Context
The TLE7729 implements four isolated satellite receiver channels, each configurable in pairs for Bus Mode operation with dedicated VSYNCxy and VBUSxy signaling. Each channel integrates a voltage regulator, current-threshold-detect logic, and Manchester decoder supporting 11-/13-/18-bit frames with CRC and sensor status bits.
Its embedded protocol handler preprocesses raw satellite data before SPI transfer to the host MCU; diagnostic functions include ground-loss detection, battery-short detection, and open-circuit identification at all SATREF pins - all executed autonomously without host intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | 125 kBaud - supports real-time crash event sampling across 4 twisted-pair sensor links. |
| Encoding format | Manchester 1 or 2 - ensures DC-balanced, self-clocked communication immune to common-mode noise. |
| Satellite supply | 4 independent regulators (6 V / 11 V) - powers mixed-sensor satellites without external LDOs. |
| SPI interface | 16-bit, 8 MHz - enables high-throughput host readout of preprocessed sensor data and diagnostics. |
| Digital I/O voltage | 3.3 V / 5 V compatible - interfaces directly with legacy and modern airbag MCUs without level-shifting. |
| Diagnostic coverage | Leakage to GND/battery, ground loss, short-to-GND, open at SATREF pins - reduces need for external fault monitoring circuitry. |
Pinout & Package
P-TSSOP-28 package with exposed thermal pad (RoHS-compliant, lead-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main supply input | 5 V ±10 % input for internal logic and SPI interface; decoupling required at pin. |
| AGND / DGND | Analog/digital ground | Separate ground domains prevent noise coupling between analog satellite receivers and digital SPI path. |
| RxD1–RxD4 | Satellite current-input receivers | Differential current sensing inputs for Manchester-encoded data from up to 8 sensors across 4 channels. |
| VSYNC12 / VSYNC34 | Synchronization outputs | Channel-pair sync signals enabling time-aligned sampling of front/side impact events. |
| SATREF12 / SATREF34 | Satellite reference sense | Monitor reference node integrity per pair; trigger diagnostics on open/short/leakage faults. |
| MOSI / MISO / SCK / CS | SPI interface | Full-duplex 16-bit SPI at up to 8 MHz for register access, status readback, and configuration. |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel satellite receiver with paired Bus Mode | Enables synchronized dual-sensor acquisition per channel (e.g., acceleration + pressure in door module) without host timing coordination. |
| Embedded Manchester protocol handler | Offloads frame synchronization, CRC validation, and sensor status extraction from host MCU - reducing firmware complexity and latency. |
| Per-channel over-temperature shutdown | Independent thermal protection per satellite link prevents single-point failure from affecting other channels during sustained fault conditions. |
| Adjustable current-threshold detection | Allows tuning sensitivity to sensor-specific modulation amplitude - critical for interoperability across diverse satellite vendors. |
Applications
| Front-Crash Detection | Side-Impact Sensing |
|---|---|
Use Scenario: Detects rapid deceleration during frontal collision using dual-axis accelerometers mounted behind radiator grille and firewall. IC Role / Device Role / Timing Role: Receives and validates Manchester-encoded acceleration data from two front-satellites via RxD1/RxD2; generates synchronized VSYNC12 for time-coherent event capture. Use Value: Enables sub-2 ms end-to-end latency from sensor sampling to MCU-triggered airbag deployment decision. | Use Scenario: Monitors door intrusion and B-pillar deformation during side collision using pressure sensors in doors and accelerometers in B-pillar. IC Role / Device Role / Timing Role: Aggregates data from four satellites (two per door) across RxD1–RxD4; uses Bus Mode pairing to correlate left/right impact severity. Use Value: Supports differentiated deployment (e.g., curtain vs. torso airbag) based on validated multi-sensor fusion within single IC. |
| Rear-Impact Occupant Protection | Passenger Presence + Crash Severity Fusion |
Use Scenario: Detects rear-end collisions using rear-bumper-mounted accelerometers and seat-track position feedback. IC Role / Device Role / Timing Role: Interfaces with rear-satellites via RxD3/RxD4; supplies regulated 11 V to high-sensitivity MEMS accelerometers. Use Value: Eliminates need for separate rear-satellite power supply, reducing ECU BOM count and layout area. | Use Scenario: Combines crash pulse profile from TLE7729 with occupant classification data from TLE7738/TLE7718 for dual-stage airbag control. IC Role / Device Role / Timing Role: Provides preprocessed, CRC-validated crash vector data via SPI to XC164 or similar airbag MCU for real-time staging logic. Use Value: Enables deterministic <50 µs SPI response time for safety-critical arbitration between crash severity and occupant presence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel automotive satellite receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLE7738 | 8-channel receiver with integrated LIN transceiver; no VSYNC outputs; supports only 11-bit Manchester. | Targeted at cost-optimized systems requiring higher channel count but less precise inter-channel timing alignment. | Select when consolidating LIN diagnostics and satellite data on single bus; avoid if VSYNC-synchronized sampling is required. |
| TLE7714 | 4-channel receiver with lower max data rate (62.5 kBaud); no adjustable current thresholds; fixed 11-bit encoding only. | Designed for entry-level airbag systems where sensor count and bandwidth requirements are reduced. | Select for legacy platform reuse where 125 kBaud or multi-bit Manchester flexibility is unnecessary. |
Compared with TLE7729TXUMA1, TLE7738 offers higher channel density but sacrifices VSYNC-based timing control and encoding flexibility, while TLE7714 reduces diagnostic granularity and data throughput - making TLE7729 the optimal choice for performance-critical front/side/rear multi-sensor fusion in Gen 5+ airbag ECUs.
Availability
TLE7729TXUMA1 is available at Aetrix Electronics and suitable for automotive restraint system development, airbag ECU production, and crash sensor module qualification requiring stable component supply and AEC-Q100 Grade 1 compliance.
Supply support for TLE7729TXUMA1 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
Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and security solutions, with global R&D and manufacturing infrastructure.
The SatRICTM product line delivers integrated satellite interface ICs for automotive restraint systems, designed to replace discrete analog front-ends and reduce ECU complexity while meeting ASIL-B functional safety requirements.
FAQ
What is the maximum number of sensors supported by TLE7729TXUMA1?
TLE7729TXUMA1 supports up to eight sensors - two per channel across its four independent satellite receiver channels. Each channel accepts current-modulated Manchester data from one or two satellites, with full diagnostics applied per SATREF pin pair.
Does TLE7729TXUMA1 require external clocking for Manchester decoding?
No. The device embeds fully autonomous Manchester decoding logic synchronized to incoming data transitions. No external clock or timing reference is needed - VSYNC outputs are provided solely for host MCU coordination of multi-channel sampling events.
How does TLE7729TXUMA1 handle sensor communication failure?
It performs continuous hardware-level diagnostics: leakage detection to GND/battery, ground-loss identification, and open-circuit detection at all SATREF pins. Fault status is latched and reported via SPI register bits, enabling immediate host-initiated fail-safe action without software polling overhead.
Can TLE7729TXUMA1 operate with 3.3 V microcontrollers?
Yes. All digital I/Os - including SPI (MOSI/MISO/SCK/CS), RxDn, and SATSYNC - are explicitly rated for 3.3 V and 5 V logic levels. No external level shifters are required when interfacing with 3.3 V airbag MCUs such as XC164CS or SAF-XC278X.
TLE7729TXUMA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- SatRIC™
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- -
- Interface:
- SPI Serial
- Voltage - Supply:
- 3.3V, 5V
- Supplier Device Package:
- PG-TSSOP-28
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
TLE7729TXUMA1 FAQ
1.How can I place an order for TLE7729TXUMA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLE7729TXUMA1 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 TLE7729TXUMA1 reliable?
The price and inventory of TLE7729TXUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLE7729TXUMA1 is usually 5 days.
3.What payment methods are accepted for TLE7729TXUMA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLE7729TXUMA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLE7729TXUMA1?
TLE7729TXUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLE7729TXUMA1 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 TLE7729TXUMA1?
For technical support, including TLE7729TXUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLE7729TXUMA1 requirements.
6.How does Aetrix verify that TLE7729TXUMA1 is sourced from the original manufacturer or authorized distributors?
All TLE7729TXUMA1 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 TLE7729TXUMA1 meets industry standards.
7.What is the process for return or replacement of TLE7729TXUMA1?
All TLE7729TXUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with TLE7729TXUMA1, 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 TLE7729TXUMA1 part is unused and in its original packaging.
Return procedure for TLE7729TXUMA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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