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Microchip Technology ATA5812-PLQ
- Part No.:
- ATA5812-PLQ
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5812-PLQ.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:344
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Product details
Overview
ATA5812-PLQ from Microchip Technology is a highly integrated UHF ASK/FSK single-channel half-duplex transceiver designed 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, draws only 10.5 mA in RX/TX mode (3 V), and integrates RX/TX switching, RSSI, SPI interface (≤500 kbit/s), and five push-button inputs active in power-down.
For engineers reviewing the ATA5812-PLQ datasheet, ATA5812-PLQ pinout, ATA5812-PLQ application, or ATA5812-PLQ equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (ASK/FSK Manchester, 1–20 kbit/s), real-world blocking performance (55 dB at ±750 kHz), and precise package mapping to QFN48 (7 × 7 mm).
Technical Context
The ATA5812-PLQ 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 high PLL bandwidth and >55 dB blocking at ±750 kHz, while integrated XTAL capacitors and tolerance compensation deliver 800 Hz RF resolution.
Transmit functionality uses direct PLL modulation for FSK and PA switching for ASK, with adjustable output power (0–10 dBm) stabilized by external resistor R_PWR. The device supports dual supply ranges (2.4–3.6 V and 4.4–6.6 V), operates from –40°C to +105°C, and includes full power management via configurable operation modes including AUX-mode inductive supply when battery is depleted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 314–316 MHz band - specifically assigned to ATA5812 variant per datasheet; no external VCO/PLL components required. |
| ASK Sensitivity | –112.5 dBm at 10 kbit/s (BER = 10⁻³) - enables reliable reception in low-power remote key fobs with loop antennas. |
| FSK Sensitivity | –109.5 dBm at 2.4 kbit/s (BER = 10⁻³) - supports robust challenge-response crypto handshakes under marginal signal conditions. |
| Supply Current (RX/TX) | 10.5 mA at 3 V - allows extended battery life in coin-cell-powered key fobs without compromising link budget. |
| Data Rate Support | ASK: 1–10 kbit/s; FSK: 1–20 kbit/s Manchester - matches automotive RKE timing requirements and transparent mode flexibility. |
| Blocking Performance | 55 dB at ±750 kHz - eliminates need for external SAW filter in key fob designs per Figure 2-1 and Section 5.6. |
| Package | QFN48, 7 × 7 mm - surface-mount footprint optimized for compact key fob PCBs with thermal pad exposed on bottom. |
| Temperature Range | –40°C to +105°C - qualified for under-hood and exterior automotive environments per AEC-Q100 stress guidelines. |
Pinout & Package
ATA5812-PLQ is supplied in a 7 × 7 mm QFN48 package with exposed thermal pad (pin 49 not bonded). All pins are electrically defined per datasheet revision 4689F–RKE–08/06; pin 1 is marked by top-side dot.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN (Pin 4) | Low-noise amplifier input | Single-ended 50 Ω RF input; impedance matched to loop antenna via external L1/C1 network per Table 5-2. |
| RF_OUT (Pin 10) | Power amplifier output | Single-ended RF output; output power adjusted via R_PWR (Pin 8) and PWR_H (Pin 9) selection. |
| 433_N868 (Pin 6) | Frequency band select | Logic-level input selecting internal VCO tuning range - tied low for 315 MHz band (ATA5812). |
| SCK/SDI_TMDI/SDO_TMDO/CS (Pins 33/32/31/35) | SPI interface | Full-duplex SPI bus (≤500 kbit/s) for register configuration, FIFO access, and status polling. |
| RSSI (Pin 36) | Received signal strength indicator | Analog voltage output proportional to log of input RF power - used for automatic gain control and link quality monitoring. |
| T1–T5 (Pins 45–41) | Wake-up key inputs | Five debounced digital inputs active in power-down mode - enable button-triggered system wake without microcontroller. |
| PWR_ON (Pin 40) | System enable | Active-high input enabling full device operation - used for external wake-up or battery-on detection. |
| Voltage Supplies (Pins 16/17/18/19/21/27) | Power domain routing | Separate AVCC/DVCC/VS1/VS2/VAUX/VSINT rails isolate analog, digital, high-voltage, and MCU interface domains. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RX/TX switch | Enables single-antenna half-duplex operation with <0.5 dB insertion loss - critical for space-constrained key fobs using loop antennas. |
| Fractional-N synthesizer | Provides 800 Hz RF frequency resolution and compensates XTAL tolerances - eliminates need for precision crystals in cost-sensitive applications. |
| Self-polling protocol engine | Handles Manchester encoding/decoding, FIFO buffering, and challenge-response arbitration - offloads crypto timing-critical tasks from 4-/8-bit MCUs. |
| Inductive AUX-mode supply | Activates internal voltage regulator when main battery drops below threshold - extends functional lifetime during deep discharge. |
| ESD protection | 2 kV HBM / 200 V MM on all pins - meets IEC 61000-4-2 Level 3 for automotive interior environments. |
| Quasi-peak detector + data slicer | Delivers <3 dB C/I requirement for FSK in presence of in-band interferers - ensures reliable demodulation in noisy RF environments like parking garages. |
Applications
| Automotive Keyless Entry | Access Control Systems |
|---|---|
Use Scenario: Bidirectional challenge-response communication between vehicle ECU and key fob within 100 ms. IC Role / Device Role / Timing Role: ATA5812-PLQ acts as the complete RF front-end and protocol engine - generating CLK, N_RESET, IRQ, and handling Manchester framing without MCU intervention. Use Value: Enables use of low-cost 4-bit microcontrollers clocked at ~4.5 MHz while meeting ISO 14230 timing constraints for passive entry go (PEPS) systems. | Use Scenario: Secure door lock/unlock via handheld fob or wall-mounted keypad in commercial buildings. IC Role / Device Role / Timing Role: ATA5812-PLQ serves as the ASK/FSK transceiver and power manager - supplying VSOUT-regulated 3.3 V to MCU and providing low-battery indication via dedicated analog output. Use Value: Reduces BOM count by integrating crystal load caps, voltage regulators, reset generator, and wake-up logic - cutting PCB area by >30% vs discrete solutions. |
| Remote Control Systems | Alarm and Telemetry Systems |
Use Scenario: Battery-powered garage door opener with push-button wake and encrypted transmission. IC Role / Device Role / Timing Role: ATA5812-PLQ operates in ultra-low-power mode with T1–T5 inputs monitoring buttons; transitions to TX mode in <150 µs upon press detection. Use Value: Achieves >5-year battery life on CR2032 due to 10.5 mA RX/TX current and sub-µA power-down draw - validated per Figure 5-5 and Table 5-5. | Use Scenario: Wireless sensor node reporting temperature/humidity to central gateway in industrial facility. IC Role / Device Role / Timing Role: ATA5812-PLQ functions as the ASK receiver and RSSI-based signal quality monitor - triggering retransmission if RSSI falls below programmable threshold. Use Value: Delivers –116.5 dBm ASK sensitivity at 2.4 kbit/s - extends range to 150+ meters in open-field telemetry deployments with loop antennas. |
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 | Lower integration: requires external SAW filter for automotive blocking specs; no integrated XTAL caps or AUX-mode supply. | Targeted at cost-optimized non-automotive remotes where SAW filters are acceptable. | Select ATA5780N-PLQW only if board space permits external filtering and crystal matching network. |
| SI4432-B1B-FM | Higher data rate (up to 500 kbit/s); wider frequency coverage (240–930 MHz); no integrated protocol engine or key inputs. | Suited for multi-band ISM systems requiring flexible modulation but lacking built-in crypto acceleration. | Choose SI4432-B1B-FM when migrating to higher-throughput telemetry or multi-region compliance, not for drop-in RKE replacement. |
Compared with ATA5780N-PLQW and SI4432-B1B-FM, the ATA5812-PLQ uniquely combines automotive-grade blocking performance (55 dB), integrated protocol handling, and ultra-low-power wake-up capability - making it the only option that satisfies full RKE/PEPS system requirements without external SAW or MCU offload compromises.
Availability
ATA5812-PLQ is available at Aetrix Electronics and suitable for automotive keyless entry, access control, and remote control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ATA5812-PLQ 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 connectivity solutions for automotive, industrial, and consumer markets.
The ATA5812-PLQ belongs to Microchip's automotive-qualified RKE transceiver product line, engineered specifically to replace discrete RF front-ends in key fobs and eliminate SAW filters while maintaining AEC-Q100 reliability.
FAQ
What is the exact frequency band supported by the ATA5812-PLQ?
The ATA5812-PLQ is specifically designed for the 314–316 MHz band, as confirmed in the General Description section of datasheet 4689F–RKE–08/06. This distinguishes it from the ATA5811, which covers 433–435 MHz and 868–870 MHz bands. The 433_N868 pin must be held low to configure the internal VCO for 315 MHz operation, and no external VCO or PLL components are required.
Does the ATA5812-PLQ require an external SAW filter in automotive key fob designs?
No, the ATA5812-PLQ does not require an external SAW filter in key fob applications. Its low-IF architecture delivers 55 dB blocking at ±750 kHz and 70 dB at ±10 MHz, combined with 30 dB image rejection and high selectivity - sufficient to meet automotive RKE specifications without added filtering, as explicitly stated in the Benefits section and validated in Figure 2-1.
How does the ATA5812-PLQ handle crystal tolerance compensation?
The ATA5812-PLQ uses its fractional-N synthesizer to compensate XTAL tolerances, achieving 800 Hz RF resolution. Initial crystal errors are corrected by measuring the CLK output frequency and programming control registers 2 and 3, reducing residual error to <±2 ppm over temperature and supply voltage - eliminating need for high-precision ±10 ppm crystals in cost-sensitive designs.
What power supply configurations does the ATA5812-PLQ support?
The ATA5812-PLQ supports dual supply ranges: 2.4–3.6 V on VS1 and 4.4–6.6 V on VS2, plus VAUX for auxiliary inductive supply during battery depletion. It also provides regulated VSOUT output for powering external 3.3 V MCUs. This flexibility enables single-cell lithium (2.4–3.6 V) or dual-cell alkaline (4.4–6.6 V) operation without external regulators.
Can the ATA5812-PLQ operate in both ASK and FSK modes without hardware changes?
Yes, the ATA5812-PLQ supports seamless switching between ASK and FSK modulation types and data rates (1–20 kbit/s) purely through SPI register configuration - no component changes or PCB modifications are needed. This is enabled by its integrated fractional-N synthesizer for FSK and PA switching architecture for ASK, as detailed in Section 1 and Figure 1-3.
ATA5812-PLQ 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-PLQ FAQ
1.How can I place an order for ATA5812-PLQ through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5812-PLQ 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-PLQ reliable?
The price and inventory of ATA5812-PLQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5812-PLQ is usually 5 days.
3.What payment methods are accepted for ATA5812-PLQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5812-PLQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5812-PLQ?
ATA5812-PLQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5812-PLQ 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-PLQ?
For technical support, including ATA5812-PLQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5812-PLQ requirements.
6.How does Aetrix verify that ATA5812-PLQ is sourced from the original manufacturer or authorized distributors?
All ATA5812-PLQ 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-PLQ meets industry standards.
7.What is the process for return or replacement of ATA5812-PLQ?
All ATA5812-PLQ units undergo pre-shipment inspection (PSI). If there is an issue with ATA5812-PLQ, 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-PLQ part is unused and in its original packaging.
Return procedure for ATA5812-PLQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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