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Microchip Technology ATA5428-PLQW 80
- Part No.:
- ATA5428-PLQW 80
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5428-PLQW 80.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,780
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Product details
Overview
ATA5428-PLQW 80 from Microchip Technology is a highly integrated UHF ASK/FSK multi-channel half-duplex transceiver in a 7 × 7 mm QFN48 package, operating at 431.5–436.5 MHz and 862–872 MHz. It delivers –109.5 dBm FSK sensitivity at 2.4 kBaud and –116.5 dBm ASK sensitivity at same rate (433.92 MHz), with programmable output power (0–10 dBm), SPI interface (≤500 kbit/s), and integrated crystal capacitors - enabling compact remote keyless entry (RKE) and access control systems.
For engineers reviewing the ATA5428-PLQW 80 datasheet, ATA5428-PLQW 80 pinout, ATA5428-PLQW 80 application, or ATA5428-PLQW 80 equivalent, this page provides verified technical context on low-IF architecture, fractional-N synthesizer tuning, RSSI and demodulator outputs, FIFO-buffered protocol handling, and 5-key wake-up support in power-down mode - all critical for automotive-grade RKE design validation.
Technical Context
The ATA5428-PLQW 80 implements a fully integrated low-IF receiver with 226 kHz IF frequency, 30 dB image rejection, and 170 kHz usable IF bandwidth. Its signal path includes LNA, mixer, eighth-order integrated IF filter, FSK/ASK demodulator, quasi-peak detector, and data slicer with sophisticated threshold control.
Transmit functionality uses a closed-loop fractional-N synthesizer with high PLL bandwidth and >55 dB blocking at ±750 kHz. The device supports ASK/FSK modulation without external component changes, features integrated RX/TX switch, single-ended RF I/O, and tolerates XTAL errors via synthesizer compensation (800 Hz RF resolution).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency Bands | 431.5–436.5 MHz and 862–872 MHz - enables dual-band RKE operation without VCO/PLL external components |
| FSK Sensitivity | –109.5 dBm at 2.4 kBaud (433.92 MHz, BER=10⁻³) - supports reliable low-power key fob reception |
| ASK Sensitivity | –116.5 dBm at 2.4 kBaud (433.92 MHz, BER=10⁻³) - improves range in amplitude-modulated base-station links |
| Data Rate Range | 1–20 kBaud Manchester FSK / 1–10 kBaud Manchester ASK - matches standard RKE challenge-response timing |
| Supply Voltage Range | 2.4–3.6 V or 4.4–6.6 V - supports single-cell Li-ion (2.4–3.6 V) and dual-cell alkaline (4.4–6.6 V) power configurations |
| RF Output Power | Adjustable 0–10 dBm via external resistor (e.g., 22 kΩ → ~5.5 dBm) - enables EIRP compliance across regulatory zones |
| Package | 7 × 7 mm QFN48 - surface-mount compatible with high-density RKE PCB layouts and loop antenna integration |
| Temperature Range | –40°C to +85°C - qualified for automotive cabin and exterior remote control environments |
Pinout & Package
ATA5428-PLQW 80 is supplied in a 7 × 7 mm QFN48 package with exposed thermal pad (EP). Pin functions are validated per Microchip Preliminary Rev. 4841A–RKE–02/05, including dedicated RF_IN/RF_OUT, 5-key inputs (T1–T5), SPI interface (CS/SCK/SDI_TMDI/SDO_TMDO), and system control signals (PWR_ON, N_RESET, IRQ, CLK, RSSI, DEM_OUT).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN | RF input terminal | Single-ended LNA input; matched to 50 Ω via external LC network for optimal sensitivity at 433.92 MHz |
| RF_OUT | RF output terminal | Single-ended PA output; connects directly to loop or PCB antenna through matching network |
| R_PWR | Output power adjustment | Resistor tie sets stabilized output power (0–10 dBm); 22 kΩ yields ~5.5 dBm at 433.92 MHz |
| PWR_H | Power level select | Logic-high enables high-power PA mode; used with R_PWR for fine-grained output control |
| 433_N868 | Frequency band selection | High = 431.5–436.5 MHz mode; Low = 862–872 MHz mode - configures internal synthesizer range |
| T1–T5 | Push-button inputs | Active-low wake-up inputs; remain functional in power-down mode to initiate RKE transmission |
| CS / SCK / SDI_TMDI / SDO_TMDO | SPI interface | Full-duplex serial interface up to 500 kbit/s; enables microcontroller configuration and FIFO data exchange |
| RSSI | Received signal strength indicator | Analog voltage output proportional to input RF power - used for link quality monitoring and adaptive polling |
| DEM_OUT | Demodulator output | Open-drain digital output of raw demodulated data - bypasses internal data slicer for custom protocol decoding |
| VS1 / VS2 | Supply voltage inputs | VS1 = 2.4–3.6 V rail; VS2 = 4.4–6.6 V rail - dual-supply architecture supports battery chemistries without external regulators |
| XTAL1 / XTAL2 | Crysal oscillator terminals | Integrated 9 pF load capacitors eliminate external caps; supports 13.25311 MHz reference crystal |
| RX_ACTIVE | Receive mode indicator | Active-high open-drain output signals ongoing RX operation - used for LED feedback or power sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Fractional-N synthesizer with 800 Hz resolution | Enables precise channel spacing and XTAL error compensation - eliminates need for oven-controlled or TCXO references in cost-sensitive RKE |
| Integrated FIFO RAM buffer | Stores received/transmitted Manchester frames - offloads microcontroller during fast challenge-response sequences (<100 ms) |
| Self-polling and protocol handling logic | Generates timing-critical RKE handshakes autonomously - allows use of low-cost 4-/8-bit MCUs clocked at ~4.5 MHz |
| Inductive AUX supply mode | Activates voltage regulator when main battery depletes - maintains system wake-up capability even at <2.0 V |
| Low-IF architecture with 55 dB blocking @ ±750 kHz | Eliminates external SAW filter in remote units - reduces BOM count and PCB area in loop-antenna designs |
| ESD protection (2 kV HBM, 200 V MM) | Meets IEC 61000-4-2 Level 3 requirements - ensures robustness during end-user handling of key fobs |
Applications
| Remote Keyless Entry (RKE) Transmitter | Automotive Passive Entry System |
|---|---|
Use Scenario: Handheld key fob transmitting encrypted challenge-response packets to vehicle receiver. IC Role / Device Role / Timing Role: Full transceiver handling RF modulation/demodulation, protocol framing, FIFO buffering, and 5-key wake-up detection. Use Value: Enables sub-100 ms bidirectional crypto handshake using only a 4-bit MCU - matching unidirectional fob size and current draw. |
Use Scenario: Vehicle-side base station detecting proximity and initiating secure authentication with key fob. IC Role / Device Role / Timing Role: High-sensitivity ASK/FSK receiver with RSSI-based distance estimation and SAW-filter-compatible front-end. Use Value: Achieves >10 dBm nonlinear dynamic range - supports reliable communication even when fob is inside pocket near door handle. |
| Home Access Control Panel | Industrial Telemetry Remote |
Use Scenario: Wall-mounted gate controller receiving unlock commands from handheld remotes. IC Role / Device Role / Timing Role: Dual-band (433/868 MHz) transceiver supporting regional ISM band compliance and interference resilience. Use Value: Integrated 55 dB blocking at ±750 kHz rejects GSM/DECT noise - eliminates need for external filtering in consumer-grade enclosures. |
Use Scenario: Battery-powered sensor node reporting meter readings via short-burst ASK transmission. IC Role / Device Role / Timing Role: Ultra-low RX current (8.4 mA @ –40°C/2.4 V) and AUX-mode operation extend shelf life beyond 10 years. Use Value: Single 22 kΩ resistor sets stable 5.5 dBm output - simplifies certification across FCC/ETSI/ARIB regulatory domains. |
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 | Higher integration: includes embedded 8051 MCU core and AES crypto engine; operates at 315/434/868/915 MHz | Targets full-featured RKE with on-chip crypto processing; requires different firmware architecture | Select when replacing discrete MCU + transceiver with single-chip solution and need hardware-accelerated encryption |
| SI4432-B1B-FM | Sub-GHz transceiver with +20 dBm PA, wider 119–1050 MHz range, but no integrated FIFO or key wake-up inputs | Requires external MCU for protocol handling; suited for long-range telemetry over RKE | Select when prioritizing output power and frequency flexibility over ultra-low-power RKE-specific features |
Compared with ATA5428-PLQW 80, ATA5780N-PLQW integrates security and processing but increases BOM complexity, while SI4432-B1B-FM offers higher transmit power and broader band coverage at the cost of missing RKE-optimized peripherals like T1–T5 wake-up pins and self-polling logic.
Availability
ATA5428-PLQW 80 is available at Aetrix Electronics and suitable for remote keyless entry (RKE), automotive passive entry, home access control, and industrial telemetry applications requiring stable component supply, long-lifecycle support, and automotive-grade temperature performance.
Supply support for ATA5428-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 global semiconductor company specializing in microcontrollers, analog devices, and connectivity solutions, with broad automotive qualification and long-term product availability commitments.
The ATA5428-PLQW 80 belongs to Microchip's ATA54xx family of highly integrated UHF transceivers designed specifically for cost-sensitive, battery-operated RKE and access control systems - emphasizing minimal external components, ultra-low RX current, and robust RF performance in compact form factors.
FAQ
What is the primary RF frequency range supported by the ATA5428-PLQW 80?
The ATA5428-PLQW 80 operates in two licensed ISM bands: 431.5–436.5 MHz and 862–872 MHz. These ranges cover major regional allocations including EU 433.92 MHz and 868.3 MHz, and North American 915 MHz adjacent bands. Band selection is controlled by the 433_N868 pin, and no external VCO or PLL components are required for either range - a key enabler for dual-band remote keyless entry systems using the ATA5428-PLQW 80.
How does the ATA5428-PLQW 80 achieve high sensitivity without an external SAW filter?
The ATA5428-PLQW 80 achieves –109.5 dBm FSK sensitivity at 2.4 kBaud (433.92 MHz) through its integrated low-IF architecture with 226 kHz IF, eighth-order on-chip IF filter, and 55 dB narrowband blocking at ±750 kHz. This performance, combined with the typical 15–20 dB insertion loss and narrow bandwidth of loop antennas used in key fobs, eliminates the need for bulky external SAW filters - reducing bill-of-materials cost and PCB area in compact RKE designs using the ATA5428-PLQW 80.
Can the ATA5428-PLQW 80 operate with a single lithium coin cell?
Yes, the ATA5428-PLQW 80 supports 2.4–3.6 V operation on its VS1 supply rail, making it compatible with standard CR2032 (3.0 V nominal) and BR2032 (2.8 V) lithium coin cells. Its RX current is as low as 8.4 mA at –40°C and 2.4 V - optimized for worst-case battery performance. Additionally, the integrated AUX-mode inductive supply activates when main voltage drops below regulation threshold, preserving wake-up capability even below 2.0 V - a critical feature for long-life RKE applications using the ATA5428-PLQW 80.
What interfaces does the ATA5428-PLQW 80 provide for microcontroller connection?
The ATA5428-PLQW 80 provides a 4-wire SPI interface (CS, SCK, SDI_TMDI, SDO_TMDO) operating up to 500 kbit/s for register configuration and FIFO data exchange. It also delivers dedicated control signals: CLK (4.5 MHz clock output), N_RESET (active-low MCU reset), IRQ (interrupt request on RX/TX completion), and PWR_ON (system enable). Five push-button inputs (T1–T5) remain active in power-down mode - enabling direct key wake-up without MCU involvement. All these interfaces simplify integration with low-cost 4-/8-bit microcontrollers in RKE systems built around the ATA5428-PLQW 80.
Does the ATA5428-PLQW 80 support both ASK and FSK modulation in the same hardware?
Yes, the ATA5428-PLQW 80 natively supports both amplitude-shift keying (ASK) and frequency-shift keying (FSK) modulation without hardware changes. ASK uses PA switching; FSK uses fractional-N synthesizer modulation. Sensitivity is –116.5 dBm (ASK) and –109.5 dBm (FSK) at 2.4 kBaud (433.92 MHz). Modulation type and data rate are software-configurable via SPI registers - allowing field-upgradable protocols and interoperability with legacy ASK base stations or newer FSK-enabled vehicles using the same ATA5428-PLQW 80 hardware platform.
ATA5428-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:
- 433MHz, 868MHz
- 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:
- 6.5mA ~ 17.3mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-VQFN (7x7)
ATA5428-PLQW 80 FAQ
1.How can I place an order for ATA5428-PLQW 80 through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5428-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 ATA5428-PLQW 80 reliable?
The price and inventory of ATA5428-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 ATA5428-PLQW 80 is usually 5 days.
3.What payment methods are accepted for ATA5428-PLQW 80?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5428-PLQW 80 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5428-PLQW 80?
ATA5428-PLQW 80 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5428-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 ATA5428-PLQW 80?
For technical support, including ATA5428-PLQW 80 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5428-PLQW 80 requirements.
6.How does Aetrix verify that ATA5428-PLQW 80 is sourced from the original manufacturer or authorized distributors?
All ATA5428-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 ATA5428-PLQW 80 meets industry standards.
7.What is the process for return or replacement of ATA5428-PLQW 80?
All ATA5428-PLQW 80 units undergo pre-shipment inspection (PSI). If there is an issue with ATA5428-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 ATA5428-PLQW 80 part is unused and in its original packaging.
Return procedure for ATA5428-PLQW 80:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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