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Microchip Technology ATA5823C-PLQW
- Part No.:
- ATA5823C-PLQW
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5823C-PLQW.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,047
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Product details
Overview
ATA5823C-PLQW from Microchip Technology (formerly Atmel) is a highly integrated UHF ASK/FSK half-duplex transceiver for automotive keyless entry and tire pressure monitoring systems. It operates in the 313–316 MHz band, delivers up to 10 dBm output power, achieves –111.5 dBm ASK sensitivity at 10 kbit/s, and supports Manchester-coded data rates from 1 to 10 kbit/s (ASK) or 1 to 20 kbit/s (FSK).
For engineers reviewing the ATA5823C-PLQW datasheet, ATA5823C-PLQW pinout, ATA5823C-PLQW application, or ATA5823C-PLQW equivalent, this page provides verified technical context, validated pin functions, real-world blocking performance data, confirmed SPI interface timing (500 kbit/s), and precise RF architecture details-including fractional-N synthesizer tolerance compensation, 226 kHz low-IF architecture, and integrated RX/TX switch operation.
Technical Context
The ATA5823C-PLQW implements a fully integrated low-IF receiver with 226 kHz IF, 30 dB image rejection, and 220 kHz system bandwidth-optimized for coexistence with ATA5756 TPM transmitters. Its fractional-N synthesizer enables 800 Hz RF resolution and compensates crystal tolerances without external components.
Transmit functionality uses closed-loop FSK modulation with high PLL bandwidth and >60 dB isolation between VCO/PLL and PA. The device integrates LNA, PA, RX/TX switch, RSSI amplifier, FIFO RAM, and digital control logic supporting self-polling, protocol handling, and wake-up via N_PWR_ON or PWR_ON pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency Band | 313–316 MHz (ATA5823 variant; confirmed for ATA5823C-PLQW per datasheet Section 1) |
| Modulation Support | ASK and FSK with Manchester encoding; no hardware change required to switch modes |
| Max Output Power | 10 dBm at 315 MHz, adjustable in 0.5 dB steps via internal resistor (SETPWR) or external R_PWR |
| Receiver Sensitivity | –111.5 dBm at 10 kbit/s ASK (100% modulation, 315 MHz, BER = 10⁻³) |
| Supply Voltage Range | 2.15–3.6 V (VS1) or 4.4–5.25 V (VS2); dual-rail support enables flexible power architecture |
| Interface | SPI at up to 500 kbit/s with configurable polarity (CS_POL), phase (SCK_PHA), and clock polarity (SCK_POL) |
| Temperature Range | –40°C to +105°C; qualified for under-hood and key fob environments |
| Power-Down Current | < 10 nA; enables multi-year battery life in passive entry applications |
Pinout & Package
ATA5823C-PLQW is housed in a 7 mm × 7 mm QFN48 package with exposed die pad (GND). Pin functions are validated per Atmel/Microchip datasheet 4829G–RKE–01/15, Figure 2-1 and Table 2-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN | RF input terminal | Connects to LNA input; impedance matched to ~925 Ω // 2.1 pF at 433.92 MHz (valid for 315 MHz per Table 5-1) |
| RF_OUT | RF output terminal | PA output node; single-ended, requires external matching network for antenna coupling |
| VS1 / VS2 | Power supply inputs | VS1: 2.15–3.6 V analog/digital rail; VS2: 4.4–5.25 V high-voltage rail; both supported simultaneously |
| R_PWR / SETPWR | Output power control | R_PWR sets power via external resistor; SETPWR enables programmable 0.5 dB-step adjustment |
| 433_N868 | Frequency band select | Logic-high selects 433 MHz band; logic-low configures 315 MHz band (confirmed for ATA5823) |
| IRQ / RSSI / CLK | System interface outputs | IRQ signals packet reception/transmission completion; RSSI provides analog signal strength; CLK supplies ~4.5 MHz clock to MCU |
| PWR_ON / N_PWR_ON | Wake-up inputs | PWR_ON (active-high) and N_PWR_ON (active-low) enable ultra-low-power wake from <10 nA sleep |
| SPI Pins (CS, SCK, SDI_TMDI, SDO_TMDO) | Digital control interface | Full-duplex SPI up to 500 kbit/s; CS_POL/SCK_POL/SCK_PHA allow polarity/phase configuration for MCU compatibility |
Key Features
| Feature | Design Value |
|---|---|
| Fractional-N synthesizer with 800 Hz RF resolution | Compensates crystal aging/tolerance errors in-system; eliminates need for precision TCXO in cost-sensitive RKE/TPM designs |
| Integrated RX/TX switch and single-ended RF I/O | Enables loop antenna placement around entire PCB-critical for compact key fobs without SAW filters |
| Low-IF architecture (226 kHz IF, 30 dB image rejection) | Delivers automotive-grade blocking performance (e.g., 60.5 dBC at ±1.5 MHz) without double-conversion complexity or external IF filters |
| FIFO-buffered digital control logic with self-polling | Offloads challenge-response crypto timing from MCU; allows use of 4-/8-bit microcontrollers clocked by onboard CLK (~4.5 MHz) |
| Wide-bandwidth AGC and high linearity (IIP3 = –20 dBm) | Handles large out-of-band blockers (>–30 dBm I1dBCP) without saturation; avoids mandatory SAW front-end in key fob designs |
| ESD protection (±2.5 kV HBM, ±200 V MM, ±500 V FCDM) | Meets AEC-Q100 stress requirements for automotive end-equipment reliability |
Applications
| Automotive Keyless Entry (RKE) | Tire Pressure Monitoring (TPM) |
|---|---|
Use Scenario: Bidirectional communication between vehicle ECU and key fob for secure access within 30 m range. IC Role / Device Role / Timing Role: Half-duplex transceiver handling ASK/FSK modulation, frequency-agile synthesis, and protocol-level challenge-response arbitration. Use Value: Eliminates external SAW filter and reduces BOM count to 10 passive components; supports fast (<100 ms) crypto handshakes using integrated FIFO and self-polling logic. |
Use Scenario: Wireless transmission of pressure/temperature data from rotating wheel sensor to vehicle receiver. IC Role / Device Role / Timing Role: Receiver interfacing with ATA5756 TPM transmitter; leverages 226 kHz IF bandwidth and ±75 kHz frequency offset tolerance. Use Value: Enables crystal tolerance relaxation (±40 ppm temp drift) due to on-chip frequency correction-reducing sensor module cost and calibration burden. |
| Passive Entry Go (PEG) | Remote Control Systems |
Use Scenario: Hands-free vehicle access triggered by proximity detection and authenticated handshake. IC Role / Device Role / Timing Role: Low-power transceiver managing wake-on-RF, ultra-fast RX/TX switching, and encrypted bidirectional messaging. Use Value: Achieves <10 nA power-down current and sub-100 ms response time-enabling seamless user experience without button press. |
Use Scenario: Industrial remote controls requiring robust wireless links in noisy RF environments. IC Role / Device Role / Timing Role: ASK/FSK transceiver with high blocking immunity (67 dBC at ±10 MHz) and wide dynamic range (115.5 dB). Use Value: Maintains link integrity near GSM/TDMA sources due to low IIP2 susceptibility and eighth-order integrated IF filtering. |
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 |
|---|---|---|---|
| ATA5824C-PLQW | Same architecture but optimized for 433–435 MHz band; differs in XTAL load capacitance and 433_N868 pin behavior | Required for 433 MHz RKE/TPM systems; not interchangeable without board-level matching network redesign | Select ATA5824C-PLQW only when operating above 430 MHz; ATA5823C-PLQW is specified for 313–316 MHz per datasheet Section 1 |
| SI4432-B1B-FM | Sub-GHz transceiver with wider frequency range (240–930 MHz); higher max output (+20 dBm); lacks integrated FIFO and self-polling logic | Suited for multi-band industrial remotes; requires external MCU for protocol handling and crypto offload | Choose SI4432-B1B-FM for flexible frequency planning or higher TX power; retain ATA5823C-PLQW for automotive-qualified, low-BOM RKE/PEG where MCU offload is critical |
Compared with ATA5824C-PLQW and SI4432-B1B-FM, the ATA5823C-PLQW uniquely combines 315 MHz optimization, integrated protocol engine, and automotive-grade blocking performance in a single QFN48 package-making it irreplaceable in cost- and size-constrained key fob and TPM receiver designs requiring zero external SAW filters.
Availability
ATA5823C-PLQW is available at Aetrix Electronics and suitable for automotive keyless entry, tire pressure monitoring, passive entry go, and industrial remote control applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ATA5823C-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 acquired Atmel in 2016 and maintains full support for the ATA5823/ATA5824 family, including documentation, validation data, and automotive qualification records.
The ATA5823C-PLQW belongs to Microchip's UHF transceiver product line, designed specifically for secure, low-power, cost-sensitive wireless links in automotive access and telemetry systems-emphasizing integration, RF robustness, and MCU offload capability.
FAQ
What frequency band does the ATA5823C-PLQW operate in?
The ATA5823C-PLQW is specified for the 313–316 MHz band, as confirmed in the official datasheet (Section 1, "General Description") and validated by its pin 6 (433_N868) logic-low configuration. It is distinct from the ATA5824 variant, which targets 433–435 MHz. This band selection aligns with global 315 MHz ISM allocations used in North American RKE and TPM systems.
Does the ATA5823C-PLQW require an external SAW filter?
No, the ATA5823C-PLQW does not require an external SAW filter in key fob applications. Its low-IF architecture, 60.5 dBC blocking at ±1.5 MHz, and wide-bandwidth AGC enable compliance with automotive RKE specifications using only discrete matching components-as demonstrated in Figure 3-1 of the datasheet. A SAW filter is optional in car-side receivers for enhanced out-of-band rejection.
How is output power adjusted on the ATA5823C-PLQW?
Output power on the ATA5823C-PLQW is adjusted via two methods: (1) external resistor R_PWR (pin 8) sets nominal power level (e.g., 22 kΩ → ~5.5 dBm); (2) internal programmable resistor SETPWR (pin 19) enables fine 0.5 dB-step adjustments via SPI register writes. Both methods are validated in datasheet Sections 5.6 and 7.2.
What is the role of the 433_N868 pin on the ATA5823C-PLQW?
Pin 6 (433_N868) selects the operating frequency band: logic-low configures the device for 315 MHz operation (ATA5823 mode), while logic-high selects 433 MHz (ATA5824 mode). For ATA5823C-PLQW, this pin must be held low to ensure correct biasing of internal VCO and matching networks per datasheet Table 2-1 and Section 1.
Can the ATA5823C-PLQW interface directly with a low-cost 8-bit microcontroller?
Yes-the ATA5823C-PLQW is explicitly designed to interface with standard 4-/8-bit MCUs. It provides a 4.5 MHz CLK output, handles protocol-level polling and buffering internally, and supports SPI at up to 500 kbit/s with configurable polarity/phase-eliminating the need for high-performance peripherals or external timing circuitry as stated in datasheet Section 1 and Figure 1-1.
ATA5823C-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:
- 10.5mA
- Current - Transmitting:
- 6.95mA ~ 15.8mA
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-VQFN (7x7)
ATA5823C-PLQW FAQ
1.How can I place an order for ATA5823C-PLQW through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5823C-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 ATA5823C-PLQW reliable?
The price and inventory of ATA5823C-PLQW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5823C-PLQW is usually 5 days.
3.What payment methods are accepted for ATA5823C-PLQW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5823C-PLQW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5823C-PLQW?
ATA5823C-PLQW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5823C-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 ATA5823C-PLQW?
For technical support, including ATA5823C-PLQW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5823C-PLQW requirements.
6.How does Aetrix verify that ATA5823C-PLQW is sourced from the original manufacturer or authorized distributors?
All ATA5823C-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 ATA5823C-PLQW meets industry standards.
7.What is the process for return or replacement of ATA5823C-PLQW?
All ATA5823C-PLQW units undergo pre-shipment inspection (PSI). If there is an issue with ATA5823C-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 ATA5823C-PLQW part is unused and in its original packaging.
Return procedure for ATA5823C-PLQW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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