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Microchip Technology ATA5824-PLQW
- Part No.:
- ATA5824-PLQW
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5824-PLQW.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,781
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Product details
Overview
ATA5824-PLQW 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 datasheet, ATA5824-PLQW pinout, ATA5824-PLQW application, or ATA5824-PLQW equivalent, this page provides verified technical context on full-duplex relay attack mitigation, low-IF receiver architecture, fractional-N synthesizer performance, SPI interface timing, and RF front-end integration for key fob and vehicle-side implementations.
Technical Context
The ATA5824-PLQW implements a fully integrated low-IF receiver with 226 kHz IF, 30 dB image rejection, and 220 kHz system bandwidth-enabling direct compatibility with ATA5756/ATA5757 TPM transmitters using standard crystals. Its fractional-N synthesizer achieves ±800 Hz RF resolution and supports multi-channel operation with arbitrary channel spacing.
Full-duplex mode eliminates duplex frequency offset, preventing relay attacks by requiring simultaneous same-frequency RX/TX. The transceiver integrates RX/TX switch, RSSI, FIFO-buffered protocol handling, self-polling logic, and clock generation-reducing MCU overhead to a 4-/8-bit controller running at ~4.5 MHz.
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), enabling robust key fob reception under weak-signal conditions |
| ASK Sensitivity | –111.5 dBm at 10 kbit/s (433.92 MHz, 100% ASK), supporting high-reliability unidirectional RKE links |
| Output Power Range | 0 to 10 dBm, adjustable in 0.5 dB steps via internal resistor or external R_PWR, stabilizing TX level across voltage/temperature |
| Data Rate Support | 1–20 kbit/s Manchester FSK; 1–10 kbit/s Manchester ASK-flexible for RKE, PEG, and TPM protocols |
| Supply Voltage | 2.15–3.6 V or 4.4–5.25 V dual-rail operation-supports both coin-cell and automotive 5 V systems |
| Power-down Current | <10 nA-enables multi-year battery life in passive entry key fobs with wake-up on button or IRQ |
Pinout & Package
ATA5824-PLQW is housed in a thermally enhanced 7 mm × 7 mm QFN48 package with exposed die pad (GND). Pin functions are validated per Microchip document 4829D–RKE–06/06.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN | Low-noise amplifier input | 50 Ω matched RF input 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 antenna with integrated RX/TX switch |
| 433_N868 | Frequency band select | Logic-level control to configure RF frontend for 433/868 MHz operation (not 315 MHz) |
| R_PWR / SETPWR | Output power adjustment | R_PWR sets 0–10 dBm via external resistor; SETPWR enables 0.5 dB-step internal programming |
| SCK / SDI_TMDI / SDO_TMDO / CS | SPI interface | 500 kbit/s max SPI bus for register access, FIFO control, and protocol configuration |
| CLK / IRQ / RSSI | System interface signals | CLK outputs ~4.5 MHz clock for MCU; IRQ signals RX/TX events; RSSI provides analog signal strength |
| PWR_ON / N_PWR_ON | Wake-up inputs | Active-high PWR_ON and active-low N_PWR_ON enable ultra-low-power wake from <10 nA sleep |
| XTAL1 / XTAL2 | Crystal oscillator terminals | Integrated 9 pF load capacitors; supports 13.25311 MHz crystal for precise 433.92/868.3 MHz synthesis |
Key Features
| Feature | Design Value |
|---|---|
| Full-duplex operation | Eliminates relay attacks by enabling simultaneous same-frequency RX/TX-no duplex offset needed |
| Low-IF receiver architecture | 226 kHz IF with 30 dB image rejection and 220 kHz bandwidth-avoids SAW filter in key fobs |
| Fractional-N synthesizer | ±800 Hz RF resolution, high PLL bandwidth, and >45 dB isolation between VCO and PA-ensures clean spectral purity |
| Digital protocol engine | FIFO-buffered RX/TX, self-polling, Manchester encoding/decoding-offloads crypto and arbitration from MCU |
| Ultra-low-power design | <10 nA power-down current with two wake-up inputs-enables decade-scale battery life in PEG fobs |
| Integrated RF frontend | Single-ended RF_IN/RF_OUT, on-chip RX/TX switch, and programmable PA efficiency up to 38%-minimizes BOM |
Applications
| Automotive Passive Entry Go (PEG) | Remote Keyless Entry (RKE) |
|---|---|
Use Scenario: Bidirectional handshake between vehicle and key fob within 1–2 m, requiring sub-100 ms response time and relay-attack resistance. IC Role / Device Role / Timing Role: Full-duplex transceiver performing synchronized challenge-response at 433.92 MHz with integrated crypto offload and clock generation. Use Value: Enables secure handsfree access without SAW filters or high-performance MCU-reducing BOM cost and board area by >30%. |
Use Scenario: One-way or bidirectional door lock/unlock commands from key fob to vehicle, operating at 433.92 MHz or 868.3 MHz. IC Role / Device Role / Timing Role: Half-duplex ASK/FSK transceiver with configurable data rate (1–20 kbit/s) and programmable output power (0–10 dBm). Use Value: Achieves –105.5 dBm sensitivity and 10 dBm output in compact QFN48-supporting >30 m range with loop antenna and coin-cell supply. |
| Tire Pressure Monitoring (TPM) | Home & Industrial Telemetering |
Use Scenario: Vehicle-side reception of pressure/temperature telemetry from ATA5757-based TPM sensors at 433.92 MHz. IC Role / Device Role / Timing Role: High-selectivity receiver with 220 kHz bandwidth and ±75 kHz tolerance-compatible with ATA5756/ATA5757 transmitter drift. Use Value: Eliminates need for external SAW or tracking filters; supports production-grade frequency tolerance without calibration. |
Use Scenario: Wireless sensor node reporting energy metering or alarm status over 433 MHz ISM band with long battery life. IC Role / Device Role / Timing Role: Low-power transceiver with <10 nA shutdown, wake-on-button, and RSSI-based link quality monitoring. Use Value: Enables 10+ year operation on CR2032; integrated AGC and blocking immunity ensure reliability near GSM/ISM interferers. |
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 | Same architecture but optimized for 313–316 MHz band; lacks 433/868 MHz support | Restricted to North American RKE systems; not suitable for ETSI 868 MHz or global 433 MHz deployments | Select only when targeting 315 MHz-only designs with identical footprint and register map |
| MAX1472ETA+ | ASK-only transmitter (no RX); no full-duplex capability; lower integration (external LNA/PA required) | Unidirectional RKE only; cannot support PEG or TPM receive functions | Use where cost-sensitive one-way fobs dominate and relay attack prevention is not required |
Compared with ATA5824-PLQW, ATA5823-PLQW serves 315 MHz exclusively and shares pinout/register compatibility, while MAX1472ETA+ is a simpler ASK transmitter lacking receive, full-duplex, or protocol acceleration-making it unsuitable for PEG or bidirectional TPM.
Availability
ATA5824-PLQW is available at Aetrix Electronics and suitable for automotive passive entry go, remote keyless entry, and tire pressure monitoring systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned manufacturing traceability.
Supply support for ATA5824-PLQW 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 leading provider of microcontroller, analog, and connectivity solutions, with deep expertise in automotive-grade RF ICs and security-focused wireless systems.
The ATA5824-PLQW belongs to Microchip's automotive UHF transceiver product line, engineered specifically for secure, low-power, full-duplex communication in passive entry, RKE, and TPM applications-emphasizing relay attack resistance and minimal external component count.
FAQ
What is the primary function of the ATA5824-PLQW in automotive systems?
The ATA5824-PLQW serves as a full-duplex UHF ASK/FSK transceiver enabling secure bidirectional communication for passive entry go (PEG) and remote keyless entry (RKE). It integrates RX/TX paths, fractional-N synthesis, protocol handling, and wake-up logic-allowing a low-cost MCU to manage crypto and arbitration while ATA5824-PLQW handles RF timing, modulation, and sensitivity-critical tasks.
Does the ATA5824-PLQW support both 433 MHz and 868 MHz bands simultaneously?
No. The ATA5824-PLQW supports 433.92 MHz and 868.3 MHz bands, but selection is controlled by the 433_N868 pin-only one band is active at a time. It does not support concurrent dual-band operation. The 315 MHz band is supported by the pin-compatible ATA5823-PLQW variant.
How does the ATA5824-PLQW prevent relay attacks in passive entry systems?
The ATA5824-PLQW prevents relay attacks through hardware-enforced full-duplex operation at the same frequency-requiring simultaneous transmission and reception without duplex offset. This forces attackers to handle real-time, same-frequency bidirectional traffic, which is physically infeasible with conventional relay equipment. No software or protocol layer is needed to achieve this protection.
What is the role of the R_PWR and SETPWR pins on the ATA5824-PLQW?
R_PWR is an external resistor connection that sets output power from 0 to 10 dBm in analog fashion; SETPWR is an internal programmable resistor adjusted via SPI registers to fine-tune power in 0.5 dB steps. Both allow stable, temperature-compensated output power-critical for consistent range and regulatory compliance across battery voltage and ambient conditions.
Can the ATA5824-PLQW interface directly with a low-cost 8-bit microcontroller?
Yes. The ATA5824-PLQW delivers a ~4.5 MHz CLK output, handles Manchester encoding/decoding, buffers RX/TX data in FIFO RAM, and manages polling and protocol timing internally. This allows use of basic 4-/8-bit MCUs without dedicated radio peripherals-reducing system cost and complexity while maintaining <100 ms PEG response time.
ATA5824-PLQW 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 FAQ
1.How can I place an order for ATA5824-PLQW through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5824-PLQW 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 reliable?
The price and inventory of ATA5824-PLQW 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 is usually 5 days.
3.What payment methods are accepted for ATA5824-PLQW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5824-PLQW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5824-PLQW?
ATA5824-PLQW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5824-PLQW 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?
For technical support, including ATA5824-PLQW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5824-PLQW requirements.
6.How does Aetrix verify that ATA5824-PLQW is sourced from the original manufacturer or authorized distributors?
All ATA5824-PLQW 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 meets industry standards.
7.What is the process for return or replacement of ATA5824-PLQW?
All ATA5824-PLQW units undergo pre-shipment inspection (PSI). If there is an issue with ATA5824-PLQW, 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 part is unused and in its original packaging.
Return procedure for ATA5824-PLQW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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