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Microchip Technology ATA5823-PLQW
- Part No.:
- ATA5823-PLQW
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5823-PLQW.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,249
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Product details
Overview
ATA5823-PLQW from Microchip Technology is a highly integrated UHF ASK/FSK transceiver for automotive passive entry go (PEG) and remote keyless entry (RKE), operating at 313–316 MHz, with full-duplex capability to prevent relay attacks, –105.5 dBm FSK sensitivity at 20 kbit/s, 0–10 dBm programmable output power, and SPI interface up to 500 kbit/s.
For engineers reviewing the ATA5823-PLQW datasheet, ATA5823-PLQW pinout, ATA5823-PLQW application, or ATA5823-PLQW equivalent, this device delivers verified full-duplex operation at 315 MHz, low-IF receiver architecture with 226 kHz IF and 30 dB image rejection, integrated fractional-N synthesizer with 800 Hz RF resolution, and support for Manchester-coded RKE/PEG protocols without external SAW filters.
Technical Context
The ATA5823-PLQW implements a fully integrated low-IF receiver with 226 kHz intermediate frequency, 220 kHz system bandwidth, and 30 dB image rejection-enabling robust reception in noisy automotive environments without external SAW filtering. Its fractional-N synthesizer provides multi-channel operation across 313–316 MHz with ±75 kHz center-frequency tolerance handling and <±2.0 dB in-band sensitivity variation over –40°C to +105°C.
Transmit functionality uses closed-loop FSK modulation with PLL isolation from PA, adjustable output power (0–10 dBm in 0.5 dB steps), and integrated RX/TX switch. Digital control logic includes FIFO-buffered self-polling, protocol handling, clock generation (~4.5 MHz CLK output), and wake-up inputs active in power-down mode (<10 nA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 313–316 MHz band; supports ATA5756/ATA5757 TPM transmitters with standard crystals |
| Receiver Sensitivity | –105.5 dBm at 20 kbit/s FSK / –111.5 dBm at 10 kbit/s ASK (BER = 10⁻³) |
| Transmit Output Power | Programmable 0 to 10 dBm via external resistor (R_PWR) or internal SETPWR register |
| Data Rate Support | 1–20 kbit/s Manchester FSK; 1–10 kbit/s Manchester ASK |
| Supply Voltage Range | 2.15 V to 3.6 V (VS1) or 4.4 V to 5.25 V (VS2); dual-rail operation supported |
| Power Consumption | 10.5 mA in RX+TX mode (3 V, 5 dBm @ 433.92 MHz); <10 nA in power-down |
| Temperature Range | –40°C to +105°C; qualified for automotive cabin and under-hood applications |
Pinout & Package
ATA5823-PLQW is housed in a 7 mm × 7 mm QFN48 package with exposed thermal pad (GND). Pin functions are validated per Microchip datasheet 4829D–RKE–06/06, including dedicated RF_IN/RF_OUT paths, dual supply rails (VS1/VS2), SPI interface (CS/SCK/SDI_TMDI/SDO_TMDO), and system control pins (PWR_ON, N_PWR_ON, RX_ACTIVE, IRQ).
| 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 @ 433.92 MHz) |
| RF_OUT | Power amplifier output | Single-ended RF output; supports loop or PCB antenna; requires external matching network |
| R_PWR | Output power adjustment | External resistor sets output power level; used with PWR_H to select 0–10 dBm range |
| SETPWR | Internal programmable resistor | Digital control of output power in 0.5 dB steps; enables fine-tuning without hardware change |
| 433_N868 | Frequency band selection | Logic-level input selecting 315/433/868 MHz bands; tied high/low per target band |
| CLK | Microcontroller clock source | ~4.5 MHz clock output; eliminates need for external crystal oscillator on MCU side |
| IRQ | Interrupt request signal | Active-low interrupt indicating packet reception, transmission completion, or error condition |
| VS1 / VS2 | Supply voltage inputs | VS1: 2.15–3.6 V rail; VS2: 4.4–5.25 V rail; allows flexible power architecture in key fob/car systems |
Key Features
| Feature | Design Value |
|---|---|
| Full-duplex operation | Enables simultaneous TX/RX on same frequency to thwart relay attacks in PEG systems |
| Integrated fractional-N synthesizer | Provides 800 Hz RF resolution and multi-channel support without external VCO/PLL components |
| Low-IF receiver architecture | 226 kHz IF with 30 dB image rejection and 220 kHz bandwidth-eliminates need for SAW filter in key fobs |
| Self-polling digital control logic | FIFO-buffered protocol handling offloads MCU; supports challenge-response crypto within <100 ms |
| Ultra-low power-down current | <10 nA typical; enables years of battery life in lithium-powered key fobs |
| ESD protection | ±2.5 kV HBM, ±200 V MM, ±500 V FCDM on all pins-meets automotive reliability requirements |
Applications
| Automotive Passive Entry Go (PEG) | Remote Keyless Entry (RKE) |
|---|---|
Use Scenario: Driver approaches vehicle; system initiates bidirectional handshake between car and key fob using full-duplex mode. IC Role / Device Role / Timing Role: ATA5823-PLQW acts as secure transceiver performing synchronized TX/RX at 315 MHz to validate proximity and prevent relay spoofing. Use Value: Full-duplex operation raises relay attack complexity significantly; no SAW filter required reduces BOM cost and board space in compact key fobs. |
Use Scenario: User presses key fob button to lock/unlock doors; command transmitted to vehicle receiver. IC Role / Device Role / Timing Role: ATA5823-PLQW serves as half-duplex ASK/FSK transceiver generating compliant 315 MHz signals with Manchester encoding. Use Value: Integrated RX/TX switch and single-ended design enable loop antenna integration; low supply current extends coin-cell battery life beyond 5 years. |
| Tire Pressure Monitoring (TPM) | Home Automation Remote Control |
Use Scenario: TPM sensor transmits pressure/temperature data to vehicle ECU using ATA5757 transmitter; ATA5823-PLQW receives in car. IC Role / Device Role / Timing Role: ATA5823-PLQW operates as high-sensitivity ASK/FSK receiver supporting 315 MHz TPM frames with ±75 kHz frequency tolerance. Use Value: Wide AGC bandwidth and blocking performance (55.5 dBC @ ±750 kHz) ensure reliable reception despite engine noise and co-located RF sources. |
Use Scenario: Battery-powered remote sends encrypted commands to smart lighting or HVAC controllers. IC Role / Device Role / Timing Role: ATA5823-PLQW functions as low-power transceiver enabling bi-directional status feedback and OTA updates. Use Value: Programmable output power (0–10 dBm) and RSSI feedback allow adaptive link budget management in variable-range indoor environments. |
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 |
|---|---|---|---|
| ATA5824-PLQW | Supports 433–435 MHz and 867–870 MHz bands; identical pinout and register map; differs only in XTAL calibration and frequency plan | Used in 433/868 MHz RKE/PEG systems; not suitable for 315 MHz-only designs without retuning | Select ATA5824-PLQW only when targeting 433 or 868 MHz bands; cross-compatible firmware but requires band-specific matching networks. |
| SI4012-B1-FMR | Sub-GHz transceiver with lower integration: no integrated fractional-N synthesizer, no full-duplex mode, no self-polling logic, requires external crystal load caps | Suitable for cost-sensitive unidirectional RKE; lacks relay-attack mitigation and TPM compatibility features | Choose SI4012-B1-FMR for simple one-way remotes where full-duplex security and MCU offload are unnecessary. |
Compared with ATA5824-PLQW, ATA5823-PLQW offers optimized 315 MHz performance with tighter XTAL tolerance compensation, while SI4012-B1-FMR requires more external components and lacks built-in protocol acceleration-making ATA5823-PLQW superior for secure, low-power, automotive-grade bidirectional systems.
Availability
ATA5823-PLQW is available at Aetrix Electronics and suitable for automotive keyless entry, tire pressure monitoring systems, and industrial remote control applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for ATA5823-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 global semiconductor company specializing in microcontrollers, analog devices, and wireless solutions, with strong automotive and industrial market presence.
The ATA5823-PLQW belongs to Microchip's automotive-grade UHF transceiver product line, designed specifically for secure, low-power, full-duplex communication in passive entry go and remote keyless entry systems.
FAQ
What frequency band does the ATA5823-PLQW support?
The ATA5823-PLQW is specified for the 313–316 MHz band, making it suitable for 315 MHz automotive RKE and PEG systems. It achieves this through internal fractional-N synthesis and band-select pin (433_N868) configuration. Unlike the ATA5824-PLQW, it is not calibrated for 433 or 868 MHz operation. The device maintains ±75 kHz frequency tolerance handling across temperature and supply voltage, enabling interoperability with ATA5756/ATA5757 TPM transmitters.
Does the ATA5823-PLQW support full-duplex operation?
Yes, the ATA5823-PLQW supports full-duplex operation at 315 MHz to prevent relay attacks in passive entry go systems. This mode requires two physically isolated antennas (e.g., overlapping loop antennas) to achieve ≥28 dB isolation between RF_OUT and RF_IN. In full-duplex mode, sensitivity degrades from –106 dBm to –96 dBm when –35 dBm coupled RF power is present at RF_IN-verified per datasheet Figure 5-1 and section 5.
How is output power configured on the ATA5823-PLQW?
Output power on the ATA5823-PLQW is configured via two complementary methods: an external resistor (R_PWR) sets coarse power levels (0–10 dBm), while the internal SETPWR register enables fine adjustment in 0.5 dB steps. The PWR_H pin selects between high- and low-power ranges. Typical implementation uses a 22 kΩ resistor for ~5.5 dBm in key fobs; full 10 dBm requires VS2 rail (4.4–5.25 V) and proper RF matching per Figure 4-1.
What interfaces does the ATA5823-PLQW provide for microcontroller connection?
The ATA5823-PLQW communicates with the microcontroller exclusively via a 4-wire SPI interface (CS, SCK, SDI_TMDI, SDO_TMDO) operating up to 500 kbit/s. It also provides dedicated signals: CLK (~4.5 MHz clock output), IRQ (active-low interrupt), and PWR_ON/N_PWR_ON (system wake-up inputs active in power-down). No I²C, UART, or parallel interface is supported-the SPI interface handles all register access and FIFO data transfer.
Is the ATA5823-PLQW qualified for automotive applications?
Yes, the ATA5823-PLQW is designed and tested for automotive use, operating across –40°C to +105°C and meeting stringent ESD requirements (±2.5 kV HBM). It supports AEC-Q100-relevant stress conditions and is deployed in production PEG and RKE systems. Its full-duplex anti-relay capability, low power consumption (<10 nA power-down), and integrated features like clock generation and self-polling reduce MCU overhead-key requirements for automotive body electronics.
ATA5823-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:
- 315MHz
- 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)
ATA5823-PLQW FAQ
1.How can I place an order for ATA5823-PLQW through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5823-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 ATA5823-PLQW reliable?
The price and inventory of ATA5823-PLQW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5823-PLQW is usually 5 days.
3.What payment methods are accepted for ATA5823-PLQW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5823-PLQW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5823-PLQW?
ATA5823-PLQW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5823-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 ATA5823-PLQW?
For technical support, including ATA5823-PLQW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5823-PLQW requirements.
6.How does Aetrix verify that ATA5823-PLQW is sourced from the original manufacturer or authorized distributors?
All ATA5823-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 ATA5823-PLQW meets industry standards.
7.What is the process for return or replacement of ATA5823-PLQW?
All ATA5823-PLQW units undergo pre-shipment inspection (PSI). If there is an issue with ATA5823-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 ATA5823-PLQW part is unused and in its original packaging.
Return procedure for ATA5823-PLQW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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