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Microchip Technology ATA5812-PLQW 80
- Part No.:
- ATA5812-PLQW 80
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5812-PLQW 80.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,601
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Product details
Overview
ATA5812-PLQW 80 from Microchip Technology is a highly integrated UHF ASK/FSK single-channel half-duplex transceiver for automotive keyless entry and access control systems. It operates at 314–316 MHz, delivers –112.5 dBm ASK sensitivity at 10 Kbit/s and –109.5 dBm FSK sensitivity at 2.4 Kbit/s, supports 1–20 Kbit/s Manchester data rates, and integrates RX/TX switching, fractional-N synthesizer, RSSI, and SPI interface.
For engineers reviewing the ATA5812-PLQW 80 datasheet, ATA5812-PLQW 80 pinout, ATA5812-PLQW 80 application, or ATA5812-PLQW 80 equivalent, this page provides verified technical context, real-world RF performance metrics, validated QFN48 package mapping, confirmed SPI-based microcontroller interface behavior, and two rigorously cross-checked alternative transceivers for RKE and access control designs.
Technical Context
The ATA5812-PLQW 80 implements a low-IF receiver architecture with 226 kHz IF frequency, 30 dB image rejection, and 170 kHz usable IF bandwidth. Its fractional-N synthesizer enables closed-loop FSK modulation with ±16 kHz deviation, 800 Hz RF resolution, and XTAL tolerance compensation - all without external VCO or PLL components.
It features integrated RX/TX switch, single-ended RF I/O, adjustable output power (0–10 dBm via external resistor), and five push-button inputs active in power-down mode. The device supports dual supply ranges (2.4–3.6 V or 4.4–6.6 V), operates from –40°C to +105°C, and includes on-chip voltage regulation, reset generation, clock output, and low-battery indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 314–316 MHz band - matches global 315 MHz ISM allocation without external VCO tuning components |
| ASK Sensitivity | –112.5 dBm at 10 Kbit/s (BER = 10⁻³) - enables reliable reception in low-power key fob environments |
| FSK Sensitivity | –109.5 dBm at 2.4 Kbit/s (BER = 10⁻³) - supports robust challenge-response crypto handshakes under weak-signal conditions |
| Data Rate | 1–20 Kbit/s Manchester FSK / 1–10 Kbit/s Manchester ASK - covers full RKE and passive entry timing requirements |
| Supply Current (RX/TX) | 10.5 mA at 3 V with 5 dBm TX - enables multi-year battery life in lithium coin-cell key fobs |
| Output Power Range | 0–10 dBm, adjusted and stabilized via external resistor - allows precise EIRP calibration per regional regulatory limits |
| Package | 7 × 7 mm QFN48 - supports compact PCB layout with single-layer loop antenna integration |
Pinout & Package
ATA5812-PLQW 80 is housed in a 7 × 7 mm, 0.5 mm pitch QFN48 package with exposed thermal pad (PLQW suffix). Pin 1 is located at bottom-left corner when marking side faces up and notch/pin-1 indicator is at top-left.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN | Low-noise amplifier input | Single-ended 50 Ω RF input port; impedance-matched via external L/C network for 315 MHz operation |
| RF_OUT | Power amplifier output | Single-ended RF output; supports direct connection to loop or PCB antenna with integrated RX/TX switch |
| 433_N868 | Frequency band select | Logic-level input that configures internal matching and synthesizer range - tied low for 315 MHz operation |
| R_PWR | Output power set resistor | Analog voltage reference node; sets PA gain via external resistor (e.g., 22 kΩ → ~5.5 dBm) |
| PWR_H | High-power mode enable | Active-high signal enabling full 10 dBm output; used with R_PWR for fine-grained EIRP control |
| SCK / SDI_TMDI / SDO_TMDO / CS | SPI interface signals | Full-duplex SPI bus (≤500 kBit/s) for register configuration, FIFO access, and status polling |
| RSSI | Received signal strength indicator | Analog voltage output proportional to log received power - used for link quality monitoring and adaptive protocols |
| DEM_OUT | Raw demodulator output | Open-drain digital signal post-data slicer - enables transparent protocol handling outside internal Manchester decoder |
| T1–T5 | Wake-up key inputs | Five debounced GPIOs active in power-down mode; support button-press wake-up without MCU involvement |
| CLK / N_RESET / IRQ / VSINT | Microcontroller support | Provides clock (≈4.5 MHz), reset assertion, interrupt signaling, and regulated 3.3 V I/O supply - reduces external BOM |
Key Features
| Feature | Design Value |
|---|---|
| Integrated low-IF receiver | 226 kHz IF with 30 dB image rejection and 170 kHz usable bandwidth - eliminates need for external SAW filter in key fobs |
| Fractional-N synthesizer | 800 Hz RF resolution with XTAL tolerance compensation - maintains ±58 kHz frequency alignment over temp/voltage without trimming |
| Self-polling digital control logic | FIFO-buffered RX/TX protocol handling - offloads crypto handshake timing from 4-/8-bit MCUs, enabling <100 ms arbitration |
| Inductive AUX supply mode | Voltage regulator activates when main battery depletes - sustains basic RF operation using antenna-coupled energy |
| On-chip crystal load capacitors | Integrated 9 pF capacitors on XTAL1/XTAL2 - eliminates two external components and improves start-up reliability |
| ESD protection | 2 kV HBM / 200 V MM on all pins - meets automotive module-level ESD robustness requirements without external TVS |
Applications
| Automotive Keyless Entry (RKE) | Passive Entry & Go (PEPS) |
|---|---|
Use Scenario: Driver presses key fob button to unlock doors; vehicle base station responds with encrypted challenge. IC Role / Device Role / Timing Role: ATA5812-PLQW 80 acts as bidirectional transceiver in fob - receives low-duty-cycle wake-up carrier, performs fast ASK/FSK demodulation, executes self-polling protocol, and transmits response within strict <100 ms latency window. Use Value: Integrated FIFO and crypto-handshake acceleration allow use of low-cost 4-bit MCU; eliminates external SAW filter and reduces total component count by ≥7 parts. |
Use Scenario: Vehicle detects fob proximity via LF field, initiates UHF challenge-response handshake upon entry zone crossing. IC Role / Device Role / Timing Role: ATA5812-PLQW 80 operates in ultra-low-power wake-up mode - monitors for valid preamble while consuming <1 µA, then transitions to full RX/TX within 200 µs to complete mutual authentication. Use Value: Five dedicated wake-up inputs (T1–T5) and AUX-mode inductive supply extend fob battery life beyond 5 years; single-ended design enables full-board loop antenna integration. |
| Access Control Systems | Energy Meter Telemetry |
Use Scenario: Secure door reader communicates with credential tag via short-range UHF burst transmission. IC Role / Device Role / Timing Role: ATA5812-PLQW 80 serves as fixed-station transceiver - handles high-blocking environments (e.g., near GSM base stations) using 55 dB narrowband blocking at ±750 kHz. Use Value: High selectivity (70 dB blocking at ±10 MHz) and –30 dBm I1dBCP eliminate need for external SAW front-end in reader hardware, reducing BOM cost by ~$0.35/unit. |
Use Scenario: Battery-powered smart meter transmits consumption data hourly to gateway using low-duty-cycle ASK bursts. IC Role / Device Role / Timing Role: ATA5812-PLQW 80 functions as autonomous telemetry node - manages sleep/wake cycles, adjusts output power based on RSSI feedback, and buffers data in internal FIFO during transmission retries. Use Value: Adjustable 0–10 dBm output and –116.5 dBm ASK sensitivity at 2.4 Kbit/s enable reliable 300 m range with CR2032 battery; integrated voltage regulator supports stable operation down to 2.4 V. |
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 |
|---|---|---|---|
| ATA5780N-PLQW | 315 MHz only; no 433/868 MHz support; lower ASK sensitivity (–109 dBm); lacks integrated XTAL caps and AUX mode | Targeted for cost-sensitive RKE fobs without multi-band or inductive backup requirements | Choose when 315 MHz-only operation and minimal feature set suffice; requires external 12 pF XTAL load caps |
| SI4432-B1B-FM | Wider frequency range (240–930 MHz); higher max data rate (256 Kbit/s); no integrated microcontroller support (no CLK/N_RESET/VSINT) | Suitable for industrial telemetry where protocol flexibility and long-range LoRa-like modes are prioritized over automotive qualification | Choose for non-automotive, multi-band, or high-throughput applications; requires external level-shifting and power management ICs |
Compared with ATA5780N-PLQW, ATA5812-PLQW 80 adds XTAL compensation, AUX-mode inductive supply, and tighter ASK sensitivity - critical for certified PEPS systems. Compared with SI4432-B1B-FM, ATA5812-PLQW 80 reduces system-level BOM count by integrating clock, reset, and supply rails - lowering total solution size and validation effort for automotive RKE.
Availability
ATA5812-PLQW 80 is available at Aetrix Electronics and suitable for automotive keyless entry, passive entry & go, access control, and energy meter telemetry requiring stable component supply across extended temperature and regulatory compliance lifecycles.
Supply support for ATA5812-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 leading provider of microcontrollers, analog devices, and connectivity solutions, with deep expertise in automotive-grade mixed-signal ICs and functional safety certification.
The ATA5812-PLQW 80 belongs to Microchip's ATA58xx family of highly integrated UHF transceivers designed specifically for automotive RKE, PEPS, and secure access systems - emphasizing ultra-low-power operation, SAW-free RF front-ends, and MCU offload capabilities.
FAQ
What is the operating frequency range supported by the ATA5812-PLQW 80?
The ATA5812-PLQW 80 is specified for the 314–316 MHz band, aligning with the global 315 MHz ISM allocation. Unlike the ATA5811, it does not support 433 MHz or 868 MHz bands - its internal matching and synthesizer are optimized exclusively for 315 MHz operation, as confirmed in the General Description section of the official datasheet (4689F–RKE–08/06).
Does the ATA5812-PLQW 80 require external crystal load capacitors?
No, the ATA5812-PLQW 80 integrates 9 pF load capacitors on both XTAL1 and XTAL2 pins, eliminating the need for external capacitors. This is explicitly stated in the Features list and verified in Figure 2-1 and Table 5-2 of the datasheet, where no external load caps appear in the 315 MHz key fob reference design.
How does the ATA5812-PLQW 80 achieve SAW-free operation in automotive key fobs?
The ATA5812-PLQW 80 achieves SAW-free operation through its high-selectivity low-IF architecture (55 dB blocking at ±750 kHz), integrated quasi-peak detector, and robust 226 kHz IF filter. These features - combined with the narrow bandwidth of a typical loop antenna - suppress out-of-band blockers sufficiently to meet automotive EMC requirements without external SAW filters, as demonstrated in Figure 2-1 and Section 5.6 of the datasheet.
What power supply configurations does the ATA5812-PLQW 80 support?
The ATA5812-PLQW 80 supports dual supply ranges: 2.4–3.6 V on VS1 (for coin-cell operation) and 4.4–6.6 V on VS2 (for automotive 5 V rail). It also includes an auxiliary inductive supply mode (VAUX) that enables continued RF operation when the primary battery is depleted - a feature confirmed in the Benefits section and Figure 4-1 of the datasheet.
Can the ATA5812-PLQW 80 operate with a standard 4-bit microcontroller?
Yes, the ATA5812-PLQW 80 is explicitly designed to work with standard 4-/8-bit MCUs. It provides CLK output (~4.5 MHz), N_RESET assertion, IRQ signaling, and regulated VSINT (3.3 V) supply - removing the need for external clock sources, level shifters, or voltage regulators. This capability is validated in the General Description and Figure 2-1, where a generic microcontroller interfaces directly via SPI.
ATA5812-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:
- 315MHz
- Data Rate (Max):
- 20kBaud
- Power - Output:
- 10dBm
- Sensitivity:
- -116.5dBm
- Memory Size:
- -
- Serial Interfaces:
- SPI
- GPIO:
- -
- Voltage - Supply:
- 2.4V ~ 3.6V
- Current - Receiving:
- 10.3mA ~ 10.5mA
- Current - Transmitting:
- 8.5mA ~ 17.8mA
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-VQFN (7x7)
ATA5812-PLQW 80 FAQ
1.How can I place an order for ATA5812-PLQW 80 through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5812-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 ATA5812-PLQW 80 reliable?
The price and inventory of ATA5812-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 ATA5812-PLQW 80 is usually 5 days.
3.What payment methods are accepted for ATA5812-PLQW 80?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5812-PLQW 80 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5812-PLQW 80?
ATA5812-PLQW 80 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5812-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 ATA5812-PLQW 80?
For technical support, including ATA5812-PLQW 80 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5812-PLQW 80 requirements.
6.How does Aetrix verify that ATA5812-PLQW 80 is sourced from the original manufacturer or authorized distributors?
All ATA5812-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 ATA5812-PLQW 80 meets industry standards.
7.What is the process for return or replacement of ATA5812-PLQW 80?
All ATA5812-PLQW 80 units undergo pre-shipment inspection (PSI). If there is an issue with ATA5812-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 ATA5812-PLQW 80 part is unused and in its original packaging.
Return procedure for ATA5812-PLQW 80:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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