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Microchip Technology ATA5812C-PLQW
- Part No.:
- ATA5812C-PLQW
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5812C-PLQW.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,182
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Product details
Overview
ATA5812C-PLQW from Microchip Technology is a highly integrated UHF ASK/FSK half-duplex transceiver for automotive RKE and access control systems, operating at 314–316 MHz with -117 dBm ASK sensitivity at 1 kBaud, 10.5 mA RX/TX supply current at 3 V, and integrated fractional-N synthesizer supporting 1–10 kBaud ASK / 1–20 kBaud FSK Manchester modulation.
For engineers reviewing the ATA5812C-PLQW datasheet, ATA5812C-PLQW pinout, ATA5812C-PLQW application, or ATA5812C-PLQW equivalent, this device delivers automotive-grade RF performance in a QFN48 package with SPI interface, RSSI output, 5 push-button inputs, and full protocol handling - enabling compact, low-cost key fob designs without external SAW filters or high-end microcontrollers.
Technical Context
The ATA5812C-PLQW implements a fully integrated low-IF receiver architecture with 226 kHz IF frequency, 30 dB image rejection, and 170 kHz usable IF bandwidth, paired with a closed-loop fractional-N synthesizer for FSK modulation and PA switching for ASK transmission. Its digital control logic includes self-polling, FIFO buffering, and transparent mode support for non-Manchester protocols.
It features dual supply rails (2.4–3.6 V and 4.4–6.6 V), inductive AUX-mode operation when battery is depleted, integrated XTAL load capacitors, and robust blocking performance (55 dB at ±750 kHz, 70 dB at ±10 MHz) - all optimized to eliminate external SAW filters in key fob applications while maintaining ±1.8 dB inband sensitivity stability across temperature and voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 314–316 MHz band - supports 315 MHz systems without external VCO/PLL components |
| ASK Sensitivity | -117.0 dBm at 1 kBaud (BER = 10⁻³) - enables reliable reception in low-power remote key fobs |
| FSK Sensitivity | -110.0 dBm at 1 kBaud (BER = 10⁻³) - maintains link budget in noisy automotive environments |
| Supply Current (RX/TX) | 10.5 mA at 3 V - minimizes battery drain during active communication cycles |
| Data Rate Support | 1–10 kBaud ASK / 1–20 kBaud FSK Manchester - covers standard RKE and passive entry timing requirements |
| Output Power Range | 0 to 10 dBm, resistor-adjustable - allows precise EIRP tuning per regional regulatory limits |
| Package | 7 × 7 mm QFN48 - enables compact PCB layout in space-constrained key fob enclosures |
| Temperature Range | -40°C to +105°C - qualified for under-hood and exterior automotive mounting |
Pinout & Package
ATA5812C-PLQW is supplied in a 7 × 7 mm, 48-pin QFN package with exposed thermal pad (PLQW suffix). Pin functions are validated per Microchip Rev. 4689B–RKE–04/04 datasheet Figure 2 and Pin Description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN | RF input | Single-ended LNA input for 315 MHz band; matched to 50 Ω via external LC network |
| RF_OUT | RF output | Single-ended PA output; supports loop or PCB antenna with integrated RX/TX switch |
| R_PWR | Power adjustment | Resistor-connected terminal to set output power from 0 to 10 dBm with ±0.5 dB accuracy |
| PWR_H | Power select | Logic-level pin selecting high-power PA mode for extended range operation |
| 433_N868 | Frequency band select | Configures internal path for 315 MHz (low), 433 MHz (mid), or 868 MHz (high) bands |
| SCK/SDI_TMDI/SDO_TMDO/CS | SPI interface | Full-duplex SPI up to 500 kBit/s for register access, FIFO control, and status readback |
| RSSI | Signal strength indicator | Analog voltage output proportional to received signal level - used for automatic gain control or link quality monitoring |
| T1–T5 | Push-button inputs | Five wake-up-capable GPIOs active in power-down mode - enable button-triggered system startup |
| N_RESET | Microcontroller reset | Open-drain output driving external MCU reset line - synchronized to internal power-on reset sequence |
| CLK | System clock output | 4.5 MHz clock provided to MCU - eliminates need for separate crystal oscillator in host controller |
| RX_ACTIVE | Receive status indicator | Active-high signal indicating ongoing RX mode - used for LED indication or power management coordination |
| VS1 / VS2 | Supply inputs | VS1: 2.4–3.6 V rail; VS2: 4.4–6.6 V rail - supports dual-battery or boosted supply configurations |
| VAUX | Auxiliary supply | Inductive charging input enabling operation when main battery is depleted - critical for fail-safe key fob function |
Key Features
| Feature | Design Value |
|---|---|
| Low-IF receiver architecture | 226 kHz IF with 30 dB image rejection and 170 kHz usable bandwidth - eliminates image interference without external filters |
| Fractional-N synthesizer | 800 Hz RF resolution with XTAL tolerance compensation - enables stable operation with low-cost ±100 ppm crystals |
| Integrated protocol engine | FIFO-buffered RX/TX handling with self-polling and challenge-response arbitration - offloads crypto timing-critical tasks from 4-/8-bit MCU |
| Single-ended RF design | High isolation between PLL/VCO and PA - permits loop antenna placement surrounding entire PCB without shielding |
| Power management modes | Deep power-down with 5 wake-up inputs and AUX-mode inductive supply - extends battery life beyond 5 years in typical RKE use |
| Robust blocking performance | 55 dB blocking at ±750 kHz, 70 dB at ±10 MHz - meets automotive EMC requirements without SAW front-end filter |
Applications
| Automotive Keyless Entry | Passive Entry & Go (PEPS) |
|---|---|
Use Scenario: Wireless door unlock triggered by proximity detection within 1–2 meters of vehicle. IC Role / Device Role / Timing Role: Half-duplex transceiver handling bidirectional challenge-response crypto exchange at sub-100 ms latency. Use Value: Integrated FIFO and self-polling reduce MCU overhead, enabling secure authentication using low-cost 8-bit microcontrollers clocked by ATA5812C-PLQW's 4.5 MHz CLK output. |
Use Scenario: Hands-free vehicle access where driver carries authenticated fob and enters cabin without pressing buttons. IC Role / Device Role / Timing Role: Low-power RF transceiver managing multiple rapid arbitration sequences with base station antennas. Use Value: -117 dBm ASK sensitivity and ±1.8 dB inband stability ensure reliable link margin across temperature, voltage, and crystal aging - critical for fail-safe entry. |
| Access Control Systems | Energy Meter Telemetry |
Use Scenario: Secure wireless credential verification for building entry, garage gates, or industrial equipment. IC Role / Device Role / Timing Role: ASK/FSK transceiver implementing encrypted rolling-code protocols with configurable data rate and output power. Use Value: Adjustable 0–10 dBm output via R_PWR resistor allows compliance with regional ISM band regulations (e.g., ETSI EN 300 220) without hardware changes. |
Use Scenario: Battery-powered utility meter transmitting consumption data hourly via unidirectional burst transmission. IC Role / Device Role / Timing Role: Ultra-low-current transceiver operating in periodic listen-before-transmit mode with wake-up on timer or external event. Use Value: 10.5 mA RX/TX current and deep power-down with VAUX inductive backup extend 2×AA battery life beyond 10 years - reducing maintenance cost and environmental impact. |
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 |
|---|---|---|---|
| ATA5811C-PLQW | Supports 433–435 MHz and 868–870 MHz bands; identical pinout and register map but different frequency calibration | Targeted at European 868 MHz and North American 433 MHz RKE systems - not suitable for 315 MHz deployments | Select ATA5811C-PLQW only for 433/868 MHz base stations or key fobs requiring higher-frequency operation. |
| SI4362-B1B-FMR | Sub-GHz transceiver with lower RX current (13.7 mA), wider frequency range (142–1050 MHz), and no integrated protocol engine or wake-up keys | Requires external MCU for protocol handling and lacks T1–T5 wake-up inputs - increases BOM and firmware complexity | Choose SI4362-B1B-FMR when multi-band flexibility or ultra-low sleep current (<10 nA) outweighs integrated feature benefits of ATA5812C-PLQW. |
Compared with ATA5811C-PLQW, the ATA5812C-PLQW provides optimized 315 MHz performance and factory-tuned calibration for North American automotive RKE, while SI4362-B1B-FMR trades integration for broader frequency coverage and higher receive sensitivity at the cost of added system-level design effort.
Availability
ATA5812C-PLQW is available at Aetrix Electronics and suitable for automotive keyless entry, passive entry & go, access control, and energy meter telemetry requiring stable component supply, long-lifecycle support, and AEC-Q100-aligned reliability.
Supply support for ATA5812C-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 leadership in automotive, industrial, and IoT connectivity markets.
The ATA5812C-PLQW belongs to Microchip's automotive-grade RKE transceiver product line, engineered specifically for cost-sensitive, battery-operated wireless security systems demanding high integration, regulatory compliance, and extended temperature operation.
FAQ
What frequency band does the ATA5812C-PLQW support?
The ATA5812C-PLQW is optimized for the 314–316 MHz band, making it suitable for 315 MHz ISM applications including North American automotive keyless entry and access control systems. It achieves full performance without external VCO or PLL components and uses the 433_N868 pin to configure internal RF paths for this band.
Does the ATA5812C-PLQW require an external SAW filter?
No, the ATA5812C-PLQW does not require an external SAW filter due to its high blocking performance (55 dB at ±750 kHz, 70 dB at ±10 MHz) and low-IF architecture with 30 dB image rejection. This eliminates BOM cost and board space in key fob designs while meeting automotive EMC requirements.
How is output power adjusted on the ATA5812C-PLQW?
Output power on the ATA5812C-PLQW is adjusted from 0 to 10 dBm using an external resistor connected to the R_PWR pin. A typical 22 kΩ resistor sets output power to approximately 5.5 dBm at 315 MHz, with fine resolution enabled by the integrated fractional-N synthesizer's closed-loop control.
What interfaces does the ATA5812C-PLQW provide for microcontroller connection?
The ATA5812C-PLQW provides a 4-wire SPI interface (SCK, SDI_TMDI, SDO_TMDO, CS) operating up to 500 kBit/s, plus dedicated signals including CLK (4.5 MHz system clock output), N_RESET (open-drain MCU reset), IRQ (interrupt request), and RSSI (analog received signal strength indicator).
Can the ATA5812C-PLQW operate with a single lithium coin cell?
Yes, the ATA5812C-PLQW supports operation from a single 2.4–3.6 V supply (VS1) and includes VAUX input for inductive auxiliary supply - enabling continued functionality even when the primary battery is fully depleted, a critical feature for automotive key fobs requiring fail-safe operation.
ATA5812C-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):
- 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)
ATA5812C-PLQW FAQ
1.How can I place an order for ATA5812C-PLQW through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5812C-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 ATA5812C-PLQW reliable?
The price and inventory of ATA5812C-PLQW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5812C-PLQW is usually 5 days.
3.What payment methods are accepted for ATA5812C-PLQW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5812C-PLQW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5812C-PLQW?
ATA5812C-PLQW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5812C-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 ATA5812C-PLQW?
For technical support, including ATA5812C-PLQW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5812C-PLQW requirements.
6.How does Aetrix verify that ATA5812C-PLQW is sourced from the original manufacturer or authorized distributors?
All ATA5812C-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 ATA5812C-PLQW meets industry standards.
7.What is the process for return or replacement of ATA5812C-PLQW?
All ATA5812C-PLQW units undergo pre-shipment inspection (PSI). If there is an issue with ATA5812C-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 ATA5812C-PLQW part is unused and in its original packaging.
Return procedure for ATA5812C-PLQW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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