My Inquiry
My Account
Microchip Technology ATA5505-P3QW
- Part No.:
- ATA5505-P3QW
- Manufacturer:
- Microchip Technology
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- 38-VFQFN Exposed Pad
- Datasheet:
-
ATA5505-P3QW.pdf
- Description:
- IC RFID READER 125KHZ 38VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,845
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ATA5505-P3QW from Microchip (acquired Atmel) is an integrated 8-bit AVR microcontroller with embedded LF-RFID reader/writer front end and LIN 2.1 controller, designed for automotive immobilizer systems. It features 16KB ISP Flash, 512B EEPROM, 512B SRAM, 10-bit ADC with 11 single-ended channels, and operates from 7–16V battery supply with internal 5V regulator. Its on-chip oscillator eliminates need for external crystal in 125kHz RFID applications.
For engineers reviewing the ATA5505-P3QW datasheet, ATA5505-P3QW pinout, ATA5505-P3QW application, or ATA5505-P3QW equivalent, key selection criteria include integrated 125kHz coil driver capability, LIN/UART dual-mode interface, programmable current source for node ID, and automotive-grade operating temperature (–40°C to +85°C).
Technical Context
The ATA5505-P3QW integrates a Harvard-architecture AVR CPU executing 123 instructions at up to 1 MIPS/MHz, with 32 general-purpose registers directly connected to the ALU for single-cycle arithmetic. Its RF front end includes a tunable 100–150kHz oscillator, coil drivers (COIL1/COIL2), and demodulation circuitry supporting Manchester and Biphase modulation at up to 5 kbaud.
It implements dual timer subsystems: an 8-bit Timer/Counter0 with PWM/compare and a 16-bit Timer/Counter1 with two output compare units or 16-bit PWM driving up to four pins. The LIN controller supports both master and slave modes compliant with LIN 2.1 and 1.3 specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Atmel AVR 8-bit RISC with 32 GP registers, 123 instructions, most execute in one clock cycle |
| Memory | 16KB ISP Flash (10,000 write/erase cycles), 512B EEPROM (100,000 cycles), 512B SRAM |
| RF Front End | Integrated 125kHz LF reader/writer with COIL1/COIL2 drivers, no external crystal required |
| ADC | 10-bit successive approximation ADC with 11 single-ended or 8 differential channels (8x/20x gain) |
| LIN Interface | Hardware LIN 2.1/1.3 controller with RXLIN/TXLIN pins and 100µA ±10% current source for node ID |
| Operating Voltage | 7–16V battery input; internal 4.5–5.5V regulated supply for digital/analog domains |
| Temperature Range | –40°C to +85°C, qualified for automotive immobilizer and access control environments |
Pinout & Package
ATA5505-P3QW is housed in a 38-pin QFN package (5 mm × 7 mm) with exposed thermal pad, optimized for compact automotive modules and low EMI emission.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COIL1 / COIL2 | LF-RFID coil driver outputs | Differential drive stage for 125kHz antenna excitation; enables contactless transponder powering and data exchange |
| VBATT | Battery voltage input | Direct connection to vehicle battery (7–16V); powers internal regulator and RF front end |
| VEXT / DVS | External driver supply inputs | Supports external high-current coil driver stages; isolates analog power domain from digital noise |
| RX LIN / TX LIN | LIN bus interface pins | Hardware-level LIN physical layer I/O; enables direct connection to LIN transceiver without external level-shifting |
| PA0 / PA1 | Multi-function I/O (RXLIN/TXLIN, ADC0/ADC1) | Shared LIN UART and ADC inputs - allows simultaneous diagnostics and sensor monitoring in immobilizer stack |
| ISRC | Programmable current source | 100µA ±10% output for LIN node identification; eliminates need for external resistor network |
| STBY | Front-end standby control | Hardware-gated shutdown of RF section to reduce quiescent current during sleep mode |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 125kHz RFID front end | Eliminates discrete oscillator, amplifier, and demodulator components - reduces BOM count and PCB area by ≥7 parts |
| Dynamic clock switching | Runtime selection between internal 8MHz RC, external crystal, or watchdog oscillator - optimizes power vs. timing precision per operational state |
| DebugWIRE on-chip debug | Single-wire in-circuit debugging via PB7 pin - enables firmware validation without JTAG header or additional pins |
| ADC noise reduction mode | Stops CPU and all I/O except ADC during conversion - achieves stable 10-bit readings in electrically noisy automotive environments |
| Three software-selectable power modes | Idle, ADC noise reduction, and Power-down modes with sub-10µA standby current - extends battery life in always-on immobilizer nodes |
Applications
| Automotive Immobilizer System | Access Control Reader |
|---|---|
Use Scenario: Embedded in vehicle ignition module to authenticate transponder-equipped keys via 125kHz magnetic field. IC Role / Device Role / Timing Role: Full-stack LF-RFID reader IC performing carrier generation, modulation/demodulation, protocol decoding, and LIN communication with ECU. Use Value: Enables secure, crystal-free key authentication with <5kbaud Manchester data rate and integrated LIN 2.1 compliance for seamless ECU integration. |
Use Scenario: Standalone door reader for office or facility entry using ISO 11784/11785-compliant animal or personnel tags. IC Role / Device Role / Timing Role: Self-contained RFID reader with on-chip power supply, coil driver, and microcontroller - requires no host MCU. Use Value: Reduces system cost and size by integrating transponder energy transfer, signal processing, and application logic in single QFN38 package. |
| Industrial Component Authentication | Waste Management Tag Reader |
Use Scenario: Verifying genuine OEM parts (e.g., brake calipers, ECUs) during assembly or service using embedded RFID tags. IC Role / Device Role / Timing Role: Secure authentication engine with EEPROM-stored keys and hardware-assisted crypto primitives via AVR core. Use Value: Prevents counterfeit parts integration using tamper-resistant flash locking and 512B EEPROM for secure credential storage. |
Use Scenario: Mounted on garbage truck arm to read RFID tags on bins during collection route. IC Role / Device Role / Timing Role: Ruggedized LF reader operating from 12V vehicle supply with wide-temp support and coil tuning for variable tag orientation. Use Value: Maintains reliable 125kHz read range (>15 cm) across vibration, temperature swings, and coil misalignment due to integrated tuning (RF pin) and HIPASS gain control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LF-RFID microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP PCF7961 | Dedicated 125kHz transponder IC without embedded MCU; requires external microcontroller for protocol handling | Used in simpler immobilizer designs where application logic resides off-chip | Select when full MCU functionality is unnecessary and BOM cost must be minimized |
| Infineon TDA5145 | Standalone 125kHz front end with analog output only; no ADC, Flash, or LIN interface | Suitable for analog-signal-based RFID readers with external DSP or MCU | Choose when system already includes a capable host processor and only RF analog functions are needed |
Compared with PCF7961 and TDA5145, ATA5505-P3QW provides monolithic integration of RFID front end, 8-bit AVR core, LIN interface, and EEPROM - eliminating inter-chip communication latency, reducing PCB layers, and enabling standalone operation without external controller.
Availability
ATA5505-P3QW is available at Aetrix Electronics and suitable for automotive immobilizer systems, industrial component authentication, and waste management RFID readers requiring stable component supply across extended product lifecycles.
Supply support for ATA5505-P3QW 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
Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel AVR products including the ATA5505 series.
The ATA5505 belongs to Atmel's automotive-grade RFID microcontroller family, engineered specifically for secure, low-power, crystal-free 125kHz transponder reading in safety-critical vehicle access and anti-theft systems.
FAQ
What is the primary function of the ATA5505-P3QW in automotive systems?
The ATA5505-P3QW serves as a complete 125kHz LF-RFID reader IC with integrated AVR microcontroller and LIN interface, primarily used in vehicle immobilizer systems to authenticate transponder keys. It handles carrier generation, modulation/demodulation, protocol decoding, and LIN communication with the ECU - all within a single chip. Its design eliminates the need for external crystal oscillators and discrete RF components, making it ideal for space-constrained automotive modules.
Does the ATA5505-P3QW require an external crystal for 125kHz operation?
No, the ATA5505-P3QW does not require an external crystal for standard 125kHz RFID operation. It includes an internal calibrated oscillator optimized for 100–150kHz carrier generation, enabling crystal-free design. External 4–16MHz crystals or ceramic resonators are optional and used only when higher-speed MCU operation or precise timing beyond RFID requirements is needed.
How does the ATA5505-P3QW support LIN communication in vehicle networks?
The ATA5505-P3QW integrates a hardware LIN 2.1/1.3 controller with dedicated RXLIN and TXLIN pins, plus a 100µA ±10% current source (ISRC pin) for node identification. It supports both master and slave roles, allowing direct connection to a LIN transceiver without external level-shifting. This enables seamless integration into automotive body control modules and diagnostic interfaces using standardized LIN protocol.
What power supply configurations does the ATA5505-P3QW support?
The ATA5505-P3QW accepts 7–16V directly from the car battery via VBATT and generates an internal 4.5–5.5V regulated supply for digital and analog circuits. It also supports VEXT and DVS pins for external high-current coil drivers, isolating sensitive analog sections from switching noise. This dual-domain architecture ensures robust operation across automotive battery fluctuations and EMI conditions.
Can the ATA5505-P3QW operate in low-power modes for battery-powered applications?
Yes, the ATA5505-P3QW offers three software-selectable low-power modes: Idle (CPU stopped, peripherals active), ADC Noise Reduction (CPU and I/O halted except ADC), and Power-down (all functions disabled except reset/interrupt wake-up). In Power-down mode, quiescent current drops below 10µA - making it suitable for battery-backed access control readers or service-mode immobilizer diagnostics.
ATA5505-P3QW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 38-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- RFID Reader
- Frequency:
- 125kHz
- Standards:
- -
- Interface:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-VQFN (5x7)
ATA5505-P3QW FAQ
1.How can I place an order for ATA5505-P3QW through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5505-P3QW 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 ATA5505-P3QW reliable?
The price and inventory of ATA5505-P3QW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5505-P3QW is usually 5 days.
3.What payment methods are accepted for ATA5505-P3QW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5505-P3QW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5505-P3QW?
ATA5505-P3QW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5505-P3QW 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 ATA5505-P3QW?
For technical support, including ATA5505-P3QW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5505-P3QW requirements.
6.How does Aetrix verify that ATA5505-P3QW is sourced from the original manufacturer or authorized distributors?
All ATA5505-P3QW 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 ATA5505-P3QW meets industry standards.
7.What is the process for return or replacement of ATA5505-P3QW?
All ATA5505-P3QW units undergo pre-shipment inspection (PSI). If there is an issue with ATA5505-P3QW, 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 ATA5505-P3QW part is unused and in its original packaging.
Return procedure for ATA5505-P3QW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATA5505-P3QW Tags
-
SL2S2602FTBX
NXP Semiconductors
-
ST25DV04K-IER6S3
STMicroelectronics
-
ST25DV04K-IER6C3
STMicroelectronics
-
LXMSJZNCMD-217
Murata Electronics
-
NT3H2111W0FTTJ
NXP Semiconductors
-
NT3H2111W0FHKH
NXP Semiconductors
-
M24LR04E-RMC6T/2
STMicroelectronics
-
ST25DV04KC-JF6D3
STMicroelectronics
-
ST25DV64KC-IE6S3
STMicroelectronics
-
ST25DV64K-IER6T3
STMicroelectronics
-
NT3H2211W0FTTJ
NXP Semiconductors
-
NT3H2211W0FHKH
NXP Semiconductors
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
