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Microchip Technology ATA5824C-PLQW
- Part No.:
- ATA5824C-PLQW
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5824C-PLQW.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,214
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Product details
Overview
ATA5824C-PLQW from Microchip Technology (formerly Atmel) is a highly integrated UHF ASK/FSK half-duplex transceiver in a 7mm × 7mm QFN48 package, operating at 433.92MHz. It delivers –105.5dBm FSK sensitivity at 20Kbit/s, 10.5mA RX/TX supply current at 3V, and supports programmable output power from 0 to 10dBm for automotive keyless entry and tire pressure monitoring systems.
For engineers reviewing the ATA5824C-PLQW datasheet, ATA5824C-PLQW pinout, ATA5824C-PLQW application, or ATA5824C-PLQW equivalent, this page provides verified technical context, validated pin functions, real-world blocking performance data, SPI interface timing constraints, and confirmed alternative transceivers for RKE/TPM system design.
Technical Context
The ATA5824C-PLQW implements a low-IF receiver architecture with 226kHz IF, 30dB image rejection, and 220kHz system bandwidth-optimized for compatibility with ATA5756/ATA5757 TPM transmitters. Its fractional-N synthesizer enables 800Hz RF resolution and compensates XTAL tolerances without external components.
Transmit functionality uses closed-loop FSK modulation with high PLL bandwidth and >60dB isolation between PLL/VCO and PA. The integrated RX/TX switch, single-ended RF I/O, and on-chip quasi-peak detector support loop antenna integration in space-constrained key fobs while maintaining ±2.0dB in-band sensitivity stability across –40°C to +105°C and 2.15–3.6V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 433.92MHz band; no external VCO/PLL components required |
| FSK Sensitivity | –105.5dBm at 20Kbit/s (BER = 10⁻³), enabling long-range RKE operation |
| ASK Sensitivity | –111.5dBm at 10Kbit/s (100% ASK, 433.92MHz), supporting low-power wake-up |
| Supply Current | 10.5mA in combined RX/TX mode at 3V, critical for lithium coin-cell battery life |
| Data Rate | 1–20Kbit/s Manchester FSK; 1–10Kbit/s Manchester ASK-no hardware changes needed for modulation switching |
| Output Power | 0 to 10dBm, adjustable via external resistor (R_PWR) or internal programmable resistor (SETPWR) |
| Interface | SPI up to 500kBit/s with CS, SCK, SDI_TMDI, SDO_TMDO, and IRQ-enables direct connection to 4-/8-bit MCUs |
| Temperature Range | –40°C to +105°C, qualified for under-hood and key fob environments |
Pinout & Package
Package: 7mm × 7mm QFN48, exposed die pad (GND), RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN | RF input | LNA input port; matched to 50Ω via external L/C network per datasheet Figure 5-1 |
| RF_OUT | RF output | PA output port; supports single-ended loop or PCB antenna without balun |
| R_PWR / SETPWR | Power control | External resistor (R_PWR) or internal programmable resistor sets output power in 0.5dB steps |
| 433_N868 | Band selection | Logic-high selects 433MHz band; logic-low configures for 868MHz (not used in ATA5824C-PLQW) |
| CS / SCK / SDI_TMDI / SDO_TMDO | SPI interface | Full-duplex SPI at ≤500kBit/s; supports microcontroller clocking via CLK output |
| RSSI | Analog output | Received signal strength indicator voltage proportional to input power (0.5V/dBm typical) |
| IRQ | Interrupt request | Active-low open-drain signal indicating packet reception, TX completion, or error condition |
| PWR_ON / N_PWR_ON | Wake-up inputs | Active-high PWR_ON and active-low N_PWR_ON enable ultra-low-power wake-from-sleep (<10nA) |
Key Features
| Feature | Design Value |
|---|---|
| Low-IF receiver architecture | 226kHz IF with 30dB image rejection eliminates need for external SAW filter in key fobs |
| Fractional-N synthesizer | 800Hz RF resolution and XTAL tolerance compensation enable ±75kHz frequency offset tolerance |
| Integrated RX/TX switch | Single-antenna half-duplex operation with minimal insertion loss; supports loop antenna surrounding entire PCB |
| Digital control logic with FIFO | On-chip 16-byte RX/TX buffer and self-polling protocol engine reduce MCU overhead for challenge-response crypto |
| Wide dynamic range AGC | Handles blockers > I1dBCP (–30dBm) by increasing LNA/Mixer current-maintains BER < 10⁻³ at –85dBm useful signal |
| ESD protection | ±2.5kV HBM, ±200V MM, ±500V FCDM on all pins-meets automotive component robustness requirements |
Applications
| Automotive Keyless Entry (RKE) | Tire Pressure Monitoring (TPM) |
|---|---|
Use Scenario: Bidirectional communication between vehicle ECU and key fob using challenge-response crypto within <100ms. IC Role / Device Role / Timing Role: ATA5824C-PLQW acts as full-protocol transceiver-handles Manchester encoding, RSSI-based arbitration, and automatic retransmission without MCU intervention. Use Value: Enables passive entry go (PEG) with relay-attack prevention using only a 4-bit MCU clocked by ATA5824C-PLQW's 4.5MHz CLK output. | Use Scenario: Reception of ASK-modulated pressure/temperature telemetry from Atmel ATA5757 TPM sensors at 433.92MHz. IC Role / Device Role / Timing Role: ATA5824C-PLQW serves as high-selectivity receiver with 220kHz system bandwidth aligned to ATA5757's ±24kHz deviation envelope. Use Value: Tolerates worst-case ±52.2kHz transmitter offset-eliminates need for tight-tolerance crystals in vehicle-side receiver. |
| Remote Control Systems | Home Automation |
Use Scenario: Battery-powered garage door opener with push-button wake-up and encrypted command transmission. IC Role / Device Role / Timing Role: ATA5824C-PLQW operates in ultra-low-power mode (<10nA) until N_PWR_ON button press triggers full RX/TX sequence. Use Value: Achieves >5-year battery life using CR2032 cell due to integrated XTAL capacitors and efficient XTO start-up circuit (>–1.5kΩ). | Use Scenario: Wireless sensor node transmitting occupancy or temperature data via ASK to central hub. IC Role / Device Role / Timing Role: ATA5824C-PLQW provides configurable self-polling and transparent mode for non-Manchester protocols like PWM or pulse-position coding. Use Value: Minimal external BOM-only crystal, 10 capacitors, 1 resistor, and 2 inductors required for complete system solution. |
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 |
|---|---|---|---|
| SI4432-B1B-FMR | Higher max output power (20dBm), wider frequency range (240–930MHz), but requires external matching and lacks integrated XTAL caps | Preferred for long-range industrial remote controls; not optimized for automotive RKE latency or key fob size constraints | Select SI4432-B1B-FMR when extended range or multi-band flexibility outweighs BOM count and layout area savings |
| AX5043-DQ48 | Lower RX current (8.5mA), narrower IF bandwidth (125kHz), no integrated RX/TX switch-requires external RF switch | Better suited for low-duty-cycle sensor networks; lacks ATA5824C-PLQW's self-polling logic for fast RKE arbitration | Choose AX5043-DQ48 for energy-constrained IoT nodes where protocol offload is handled by host MCU |
Compared with SI4432-B1B-FMR and AX5043-DQ48, the ATA5824C-PLQW uniquely integrates crystal load capacitors, RX/TX switching, and digital protocol logic-reducing PCB area by >30% and eliminating 7 external components in RKE key fob designs.
Availability
ATA5824C-PLQW is available at Aetrix Electronics and suitable for automotive keyless entry, tire pressure monitoring, and remote control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ATA5824C-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 acquired Atmel in 2016 and maintains full support for the legacy ATA58xx transceiver family, including datasheets, reference designs, and longevity commitments.
The ATA5824 product line was designed specifically for automotive-grade UHF wireless access systems-emphasizing ultra-low-power operation, high blocking immunity, and seamless integration with Atmel's TPM transmitter portfolio (ATA5756/ATA5757).
FAQ
What is the maximum data rate supported by the ATA5824C-PLQW in FSK mode?
The ATA5824C-PLQW supports Manchester-encoded FSK data rates from 1Kbit/s to 20Kbit/s. At the maximum 20Kbit/s rate, it achieves –105.5dBm sensitivity (BER = 10⁻³) at 433.92MHz. This rate is validated for bidirectional RKE systems requiring sub-100ms challenge-response latency. The ATA5824C-PLQW maintains this performance without external component changes when switching between ASK and FSK modulation schemes.
Does the ATA5824C-PLQW require an external SAW filter for automotive key fob applications?
No, the ATA5824C-PLQW does not require an external SAW filter in key fob designs. Its low-IF receiver architecture delivers 55.5dBC blocking at ±750kHz and 67dBC at ±10MHz, combined with 30dB image rejection and wide-bandwidth AGC-meeting automotive RKE specifications without added filtering. This is confirmed in Figure 3-1 and Section 5.1 of the datasheet, where a complete key fob design uses only 10 capacitors, 1 resistor, 2 inductors, and a crystal.
How is output power adjusted on the ATA5824C-PLQW?
Output power on the ATA5824C-PLQW is adjusted via two methods: (1) external resistor R_PWR (Pin 8) sets nominal power level (e.g., 22kΩ → 5.5dBm); (2) internal programmable resistor SETPWR (Pin 19) enables fine adjustment in 0.5dB steps via SPI register writes. Both methods operate within the 0–10dBm range at 433.92MHz. The ATA5824C-PLQW's closed-loop FSK modulation ensures stable output power across temperature and supply voltage variations.
What is the function of the 433_N868 pin on the ATA5824C-PLQW?
The 433_N868 pin (Pin 6) selects the RF operating band: logic-high configures the ATA5824C-PLQW for 433MHz band operation (default for this variant), while logic-low enables 868MHz band support. Since the ATA5824C-PLQW is specified for 433.92MHz operation, this pin must be tied high (e.g., to VS1) in production designs. It is not used for frequency tuning-the fractional-N synthesizer handles all channel selection internally via SPI registers.
Can the ATA5824C-PLQW interface directly with a low-cost 4-bit microcontroller?
Yes, the ATA5824C-PLQW is explicitly designed to interface with standard 4-/8-bit microcontrollers. It provides a 4.5MHz CLK output to drive the MCU, handles Manchester encoding/decoding, manages RX/TX protocol timing, and buffers data in on-chip FIFO-reducing MCU processing load. The SPI interface operates at ≤500kBit/s, compatible with basic MCU peripherals. This capability is validated in Section 1 and Figure 3-1 of the datasheet for RKE and PEG systems.
ATA5824C-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
- 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:
- 10.5mA
- Current - Transmitting:
- 6.95mA ~ 15.8mA
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-VQFN (7x7)
ATA5824C-PLQW FAQ
1.How can I place an order for ATA5824C-PLQW through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5824C-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 ATA5824C-PLQW reliable?
The price and inventory of ATA5824C-PLQW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5824C-PLQW is usually 5 days.
3.What payment methods are accepted for ATA5824C-PLQW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5824C-PLQW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5824C-PLQW?
ATA5824C-PLQW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5824C-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 ATA5824C-PLQW?
For technical support, including ATA5824C-PLQW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5824C-PLQW requirements.
6.How does Aetrix verify that ATA5824C-PLQW is sourced from the original manufacturer or authorized distributors?
All ATA5824C-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 ATA5824C-PLQW meets industry standards.
7.What is the process for return or replacement of ATA5824C-PLQW?
All ATA5824C-PLQW units undergo pre-shipment inspection (PSI). If there is an issue with ATA5824C-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 ATA5824C-PLQW part is unused and in its original packaging.
Return procedure for ATA5824C-PLQW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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