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Microchip Technology ATA5824-PLQW 80
- Part No.:
- ATA5824-PLQW 80
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5824-PLQW 80.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,663
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Product details
Overview
ATA5824-PLQW 80 from Microchip Technology is a highly integrated UHF ASK/FSK full-duplex transceiver in a 7 mm × 7 mm QFN48 package, designed for automotive passive entry go (PEG) and remote keyless entry (RKE) systems. It delivers –105.5 dBm FSK sensitivity at 20 kbit/s, 0–10 dBm programmable output power, and operates across 433.92 MHz, 868.3 MHz, and 315 MHz bands without external VCO or PLL components.
For engineers reviewing the ATA5824-PLQW 80 datasheet, ATA5824-PLQW 80 pinout, ATA5824-PLQW 80 application, or ATA5824-PLQW 80 equivalent, this page provides verified technical context, validated pin functions, confirmed full-duplex relay-attack mitigation capability, SPI interface timing at 500 kbit/s, and real-world sensitivity degradation under coupled RF interference (–10 dBm loss at –35 dBm injected RX power).
Technical Context
The ATA5824-PLQW 80 implements a low-IF receiver architecture with 226 kHz IF, 30 dB image rejection, and 220 kHz system bandwidth-enabling compatibility with ATA5756/ATA5757 TPM transmitters using standard crystals. Its fractional-N synthesizer provides 800 Hz RF resolution, tolerates XTAL errors via closed-loop compensation, and supports multi-channel operation with arbitrary channel spacing.
Full-duplex mode eliminates relay attacks by requiring simultaneous same-frequency RX/TX-enabled by integrated RX/TX switch, dual-loop antenna support, and hardware-accelerated protocol handling. Digital control logic includes FIFO-buffered RX/TX data, self-polling, Manchester/Bi-phase decoding, and interrupt-driven microcontroller interface via SPI, CLK, and IRQ signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 433.92 MHz, 868.3 MHz, and 315 MHz-no external VCO or PLL components required |
| FSK Sensitivity | –105.5 dBm at 20 kbit/s (433.92 MHz, BER = 10⁻³)-enables reliable RKE link budget in compact key fobs |
| ASK Sensitivity | –111.5 dBm at 10 kbit/s (433.92 MHz, 100% ASK)-supports high-sensitivity wake-up and telemetry |
| Output Power Range | 0 to 10 dBm, adjustable in 0.5 dB steps via internal resistor or external R_PWR-enables regulatory compliance across regions |
| Data Rate Support | 1–20 kbit/s Manchester FSK; 1–10 kbit/s Manchester ASK-covers RKE, PEG, and TPM use cases |
| Supply Voltage | 2.15–3.6 V or 4.4–5.25 V-supports lithium coin cell and automotive 5 V rails |
| Power-down Current | <10 nA-enables multi-year battery life in passive entry systems |
| Temperature Range | –40°C to +105°C-qualified for under-hood and key fob environments |
Pinout & Package
ATA5824-PLQW 80 is housed in a thermally enhanced 7 mm × 7 mm QFN48 package with exposed die pad (GND). Pin functions are validated per Microchip datasheet 4829D–RKE–06/06.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN | Low-noise amplifier input | 50 Ω matched RF input port for receive path; impedance varies by band (e.g., 32–j169 Ω at 433.92 MHz) |
| RF_OUT | Power amplifier output | Single-ended transmit output; supports loop or PCB antennas with up to 10 dBm output |
| 433_N868 | Frequency band select | Logic-level input selecting 433/868 MHz vs. 315 MHz RF frontend configuration |
| R_PWR | External power set resistor | Analog input setting output power level via external resistor (e.g., 22 kΩ → 5.5 dBm) |
| SETPWR | Internal programmable resistor | Digital control pin enabling 0.5 dB-step output power adjustment without external components |
| SCK / SDI_TMDI / SDO_TMDO / CS | SPI interface | 500 kbit/s maximum serial interface for register access, FIFO control, and status polling |
| CLK | Microcontroller clock output | ~4.5 MHz clock delivered to MCU-eliminates need for separate crystal oscillator |
| IRQ | Interrupt request | Active-low signal indicating packet reception, TX completion, or error condition |
| RX_ACTIVE | Receive mode indicator | Open-drain output signaling active RX state-used for external LNA enable or power sequencing |
| PWR_ON / N_PWR_ON | System wake-up inputs | Active-high and active-low inputs enabling ultra-low-power wake from <10 nA sleep mode |
| XTAL1 / XTAL2 | Crystal oscillator terminals | Integrated 9 pF load capacitors-support 13.25311 MHz crystal for precise 433.92/868.3 MHz synthesis |
| RSSI | Received signal strength indicator | Analog voltage output proportional to input power-used for automatic gain control and link quality monitoring |
| CDEM | Data filter cutoff capacitor | External capacitor (e.g., 15 nF) setting high-pass corner frequency of demodulator data filter |
| GND | Ground reference | Exposed thermal pad and all ground pins must be connected to solid PCB ground plane for thermal and RF performance |
Key Features
| Feature | Design Value |
|---|---|
| Full-duplex operation mode | Prevents relay attacks by requiring simultaneous same-frequency RX/TX-no duplex frequency offset needed |
| Fractional-N synthesizer | 800 Hz RF resolution with XTAL tolerance compensation-enables ±75 kHz center frequency drift tolerance over temp/voltage |
| Integrated RX/TX switch | Enables single-antenna half-duplex RKE or dual-loop full-duplex PEG with >28 dB isolation |
| Self-polling digital control logic | Hardware-accelerated challenge-response protocol handling-reduces MCU overhead to 4-/8-bit level |
| Low-IF receiver architecture | 226 kHz IF, 30 dB image rejection, 220 kHz bandwidth-eliminates need for external SAW filter in key fobs |
| Ultra-low power-down current | <10 nA-enables >10-year battery life in passive entry applications with periodic wake-up |
Applications
| Automotive Passive Entry Go (PEG) | Tire Pressure Monitoring (TPM) |
|---|---|
Use Scenario: Key fob communicates bidirectionally with vehicle ECU while user approaches door-validating cryptographic challenge within 100 ms. IC Role / Device Role / Timing Role: Full-duplex transceiver performing simultaneous 433.92 MHz RX/TX, hardware-based protocol arbitration, and RSSI-based proximity estimation. Use Value: Prevents relay attacks without requiring external SAW filters or high-performance MCU-enables compact, cost-optimized fob design. |
Use Scenario: Vehicle base station receives tire pressure data from ATA5757-equipped sensors operating at 433.92 MHz. IC Role / Device Role / Timing Role: High-selectivity ASK/FSK receiver synchronized to ATA5757 transmitter frequency deviation (±19.5 kHz) and crystal tolerance. Use Value: Supports 220 kHz system bandwidth and ±75 kHz frequency offset tolerance-ensures robust reception despite sensor crystal aging and temperature drift. |
| Remote Keyless Entry (RKE) | Home Automation Transceivers |
Use Scenario: User presses button on key fob to lock/unlock doors; system responds with LED feedback and audible chirp. IC Role / Device Role / Timing Role: Half-duplex transceiver with programmable 0–10 dBm output, 1–20 kbit/s Manchester encoding, and integrated clock generation. Use Value: Eliminates need for external crystal and reduces BOM to 10 passive components-lowers total system cost and PCB area. |
Use Scenario: Wireless wall switch transmits occupancy or lighting commands to central hub using sub-GHz ISM band. IC Role / Device Role / Timing Role: Low-power ASK/FSK transceiver supporting 1–10 kbit/s data rates, RSSI-based signal quality reporting, and wake-on-RF capability. Use Value: Enables >5-year battery life with <10 nA power-down current and supports interoperability with legacy 433 MHz home automation protocols. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UHF ASK/FSK transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ATA5823-PLQW | Supports 313–316 MHz only; lacks full-duplex mode; identical pinout and register map | Restricted to 315 MHz RKE systems; cannot implement PEG or relay-attack-resistant full-duplex | Select when operating exclusively in 315 MHz band and full-duplex is unnecessary |
| SI4463-B1B-FMR | Sub-GHz transceiver with 126 dB link budget; no integrated full-duplex logic or PEG-specific protocol acceleration | Requires external MCU firmware for challenge-response; supports wider frequency range (142–1050 MHz) but higher BOM count | Select for multi-band flexibility or higher sensitivity where hardware-accelerated PEG is not required |
Compared with ATA5824-PLQW 80, ATA5823-PLQW offers identical integration at 315 MHz but omits full-duplex security; SI4463-B1B-FMR provides broader frequency coverage and superior sensitivity but shifts protocol handling to software-increasing MCU complexity and latency in PEG implementations.
Availability
ATA5824-PLQW 80 is available at Aetrix Electronics and suitable for automotive passive entry go (PEG), remote keyless entry (RKE), and tire pressure monitoring (TPM) systems requiring stable component supply, long-lifecycle support, and AEC-Q100-aligned reliability.
Supply support for ATA5824-PLQW 80 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 is a global semiconductor company specializing in microcontrollers, analog devices, and secure authentication ICs, with deep expertise in automotive and wireless connectivity solutions.
The ATA5824-PLQW 80 belongs to Microchip's automotive-grade UHF transceiver product line, engineered specifically for secure, low-power, full-duplex communication in passive entry and keyless access systems.
FAQ
What is the full-duplex capability of the ATA5824-PLQW 80 and how does it prevent relay attacks?
The ATA5824-PLQW 80 supports true full-duplex operation at the same frequency-enabling simultaneous transmission and reception without duplex offset. This prevents relay attacks because an attacker must receive and retransmit on the exact same carrier frequency at the same time, which requires physically co-located, synchronized, and high-isolation hardware. The ATA5824-PLQW 80 achieves this with integrated RX/TX switching, dual-loop antenna support, and hardware-accelerated protocol timing-making relay spoofing practically infeasible in real-world PEG deployments.
Does the ATA5824-PLQW 80 require external matching components for 433.92 MHz operation?
Yes-the ATA5824-PLQW 80 requires external matching components for optimal 433.92 MHz performance. Per datasheet Figure 3-1, a typical key fob design uses two inductors (L1 ≈ 5.6–56 nH, L2 ≈ 120 nH), ten capacitors (C1–C11, 1–68 nF), and one resistor (R1 ≈ 22 kΩ) for RF matching, power filtering, and output power setting. Input matching at RF_IN relies on a parallel LC network (e.g., C1 = 1.8 pF, L1 = 27 nH) to transform the measured 32–j169 Ω impedance to 50 Ω.
How does the ATA5824-PLQW 80 handle crystal frequency tolerance in PEG systems?
The ATA5824-PLQW 80 compensates crystal tolerance via its fractional-N synthesizer: initial XTAL errors (±80 ppm) are corrected by tuning control registers 2 and 3 based on CLK output measurement, reducing residual error to <±2 ppm over temperature and supply voltage. This enables ±75 kHz total frequency offset tolerance-sufficient for interoperability with ATA5757 TPM transmitters and compliant with automotive PEG timing requirements across –40°C to +105°C.
What is the role of the CDEM pin on the ATA5824-PLQW 80?
The CDEM pin on the ATA5824-PLQW 80 connects to an external capacitor (typically 15 nF) that sets the high-pass cutoff frequency of the internal data filter. This filter shapes the demodulated signal before slicing, improving noise immunity for Manchester-encoded ASK/FSK data. Its value directly affects bit-error rate at low data rates and must be selected per application-e.g., larger values improve low-frequency noise rejection but may distort fast transitions.
Can the ATA5824-PLQW 80 operate from a 3 V lithium coin cell?
Yes-the ATA5824-PLQW 80 supports 2.15 V to 3.6 V operation via VS1 supply pin, making it compatible with standard CR2032 coin cells. In RX/TX mode, it draws 10.5 mA at 3 V (5 dBm output), and in power-down mode, current drops below 10 nA-enabling multi-year battery life. Internal regulators and integrated XTAL capacitors further reduce external component count for compact key fob designs.
ATA5824-PLQW 80 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- TxRx Only
- RF Family/Standard:
- General ISM < 1GHz
- Protocol:
- -
- Modulation:
- ASK, FSK
- Frequency:
- 434MHz, 868MHz
- Data Rate (Max):
- 20kbps
- Power - Output:
- 10dBm
- Sensitivity:
- -116dBm
- Memory Size:
- -
- Serial Interfaces:
- SPI
- GPIO:
- -
- Voltage - Supply:
- 2.15V ~ 3.6V, 4.4V ~ 5.25V
- Current - Receiving:
- 10.3mA ~ 10.5mA
- Current - Transmitting:
- 6.5mA ~ 17.3mA
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-VQFN (7x7)
ATA5824-PLQW 80 FAQ
1.How can I place an order for ATA5824-PLQW 80 through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5824-PLQW 80 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 ATA5824-PLQW 80 reliable?
The price and inventory of ATA5824-PLQW 80 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5824-PLQW 80 is usually 5 days.
3.What payment methods are accepted for ATA5824-PLQW 80?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5824-PLQW 80 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5824-PLQW 80?
ATA5824-PLQW 80 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5824-PLQW 80 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 ATA5824-PLQW 80?
For technical support, including ATA5824-PLQW 80 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5824-PLQW 80 requirements.
6.How does Aetrix verify that ATA5824-PLQW 80 is sourced from the original manufacturer or authorized distributors?
All ATA5824-PLQW 80 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 ATA5824-PLQW 80 meets industry standards.
7.What is the process for return or replacement of ATA5824-PLQW 80?
All ATA5824-PLQW 80 units undergo pre-shipment inspection (PSI). If there is an issue with ATA5824-PLQW 80, 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 ATA5824-PLQW 80 part is unused and in its original packaging.
Return procedure for ATA5824-PLQW 80:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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