My Inquiry
My Account
Microchip Technology ATA5831-WNQW
- Part No.:
- ATA5831-WNQW
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ATA5831-WNQW.pdf
- Description:
- IC RF TXRX+MCU ISM<1GHZ 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,422
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ATA5831-WNQW from Microchip Technology (formerly Atmel) is a highly integrated UHF ASK/FSK transceiver with embedded 8-bit AVR® microcontroller, 20KB user flash, and 24KB RF firmware ROM. It operates across 310–318 MHz, 418–477 MHz, and 836–956 MHz bands, supports programmable output power (–12 to +14.5 dBm), and delivers –110.5 dBm ASK sensitivity at 20 kbit/s - enabling ultra-low-power remote keyless entry (RKE) fobs powered by 3V lithium cells.
For engineers reviewing the ATA5831-WNQW datasheet, ATA5831-WNQW pinout, ATA5831-WNQW application, or ATA5831-WNQW equivalent, this page provides verified technical context, exact pin functions, real-world polling and wake-up behavior, SPI-controlled service configuration, and validated alternatives for automotive RKE, TPMS, and passive entry systems.
Technical Context
The ATA5831-WNQW integrates an RF front end with low-IF architecture, digitized IF processing, and fractional-N PLL for 93 Hz (low-band) or 185 Hz (high-band) frequency resolution. Its dual-path receiver enables parallel ASK/FSK telegram detection across up to 15 channels grouped into five configurable services - three stored in EEPROM, two modifiable in SRAM during IDLEMode via SPI.
Baseband processing includes Manchester/NRZ support, programmable Rx-IF bandwidth (25–366 kHz), digital RSSI (±1 dB accuracy), and autonomous antenna tuning via ANT_TUNE pin. The embedded AVR core executes custom firmware from 20 KB flash, enabling on-the-fly service parameter updates, pattern-based wake-up, and mixed modulation telegram handling without host MCU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 310–318 MHz / 418–477 MHz / 836–956 MHz - covers global ISM bands including 315.00, 433.92, 868.30, and 915.00 MHz with single 24.305 MHz crystal |
| Modulation Support | ASK and FSK - supports mixed ASK/FSK telegrams and non-byte-aligned data transmission |
| Receiver Sensitivity | –110.5 dBm (ASK, 20 kbit/s, BWIF = 80 kHz) and –108.5 dBm (FSK, 20 kbit/s, Δf = ±20 kHz) - enables reliable reception in battery-constrained RKE fobs |
| Transmit Output Power | Programmable from –12 dBm to +14.5 dBm in 0.4 dB steps - meets ARIB STD-T96 0 dBm class and FCC Part 15 compliance |
| Supply Voltage Range | 1.9–3.6 V (3V systems) or 2.4–5.5 V (5V vehicle-side applications) - supports both key fob and ECU-side deployments |
| OFFMode Current | Typical 5 nA (max 600 nA at 3.6 V, 85°C) - enables multi-year battery life in always-on wake-up applications |
| Data Rate Range | 0.5–80 kbit/s buffered mode (120 kbit/s NRZ) - accommodates low-rate TPMS telemetry and high-speed RKE commands |
Pinout & Package
Package: 5×5 mm QFN32, 0.5 mm pitch, wettable flanks - compatible with automated optical inspection (AOI) and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RFIN_LB (Pin 1) | LNA input (low-band) | Connects to loop antenna matching network for 310–477 MHz operation; requires DC path to ground |
| RFIN_HB (Pin 2) | LNA input (high-band) | Used instead of RFIN_LB for 836–956 MHz operation (e.g., 868.3/915 MHz TPMS) |
| SPDT_ANT (Pin 4) | Antenna interface | 50 Ω impedance for both RX and TX; connects directly to PCB trace loop or external antenna |
| ANT_TUNE (Pin 5) | Varactor control | Drives internal tuning capacitor for automatic antenna resonance adjustment at TX frequency |
| RF_OUT (Pin 7) | PA output | Delivers up to +14.5 dBm; matched to SPDT_TX pin; requires external harmonic filter for FCC compliance |
| PB6/EVENT (Pin 28) | Firmware event flag | Asserts active-low signal to host MCU upon valid telegram detection, FIFO fill, or start-of-frame - eliminates polling overhead |
| PC1–PC5 (Pins 15–19) | NPWRON inputs | Five wake-up pins with internal 50 kΩ pull-ups; used for button press detection in stand-alone key fobs |
| PB4 (Pin 26) | PWRON input / LED driver | Strong high-side LED driver (also serves as primary wake-up trigger when pulled low) |
Key Features
| Feature | Design Value |
|---|---|
| Backward pin-to-pin compatibility | Direct replacement for ATA5830N and ATA5780N - no PCB layout change required for upgrade |
| Autonomous multi-channel polling | Configurable timing, channel order, and participating services - reduces average current to <1.2 mA in 3-channel 21 ms cycle |
| Dual receive path | Simultaneous ASK and FSK scanning - enables coexistence of legacy and new protocols in same device |
| On-the-fly service reconfiguration | Two SRAM-based service configs modifiable via SPI in IDLEMode - supports dynamic channel switching without reset |
| Integrated antenna tuning | Internal varactor controlled by ANT_TUNE pin - eliminates manual tuning and external components in loop antenna designs |
| Digital RSSI with ±1 dB accuracy | Digitized IF processing enables precise signal strength measurement - critical for RSSI-based proximity detection in PEG systems |
Applications
| Remote Keyless Entry (RKE) | Passive Entry Go (PEG) |
|---|---|
Use Scenario: Battery-powered key fob transmitting encrypted door unlock commands to vehicle receiver. IC Role / Device Role / Timing Role: Primary transceiver and protocol processor - handles ASK modulation, Manchester encoding, preamble detection, and wake-up via PC1–PC5 button inputs. Use Value: 5 nA OFFMode current extends lithium coin cell life beyond 5 years; integrated AVR flash allows OEM-specific encryption algorithm implementation. | Use Scenario: Vehicle-side module detecting key presence within 1–3 m using low-duty-cycle polling. IC Role / Device Role / Timing Role: Autonomous polling engine - scans multiple frequencies/channels every 21 ms using internal RC oscillator to minimize power. Use Value: 1.2 mA average current in 3-channel polling enables continuous operation from vehicle battery; EVENT pin wakes host MCU only on valid frame detection. |
| Tire Pressure Monitoring System (TPMS) | Remote Start System (RS) |
Use Scenario: Wheel-mounted sensor transmitting pressure/temperature data at 868.3 MHz using FSK modulation. IC Role / Device Role / Timing Role: High-band transceiver with temperature measurement and self-calibration - uses RFIN_HB input and supports 0.75 kbit/s FSK for extended range. Use Value: –122.5 dBm FSK sensitivity at 0.75 kbit/s enables >100 m line-of-sight range; built-in temperature sensor eliminates external IC. | Use Scenario: Aftermarket remote starter sending ignition command via 433.92 MHz ASK burst. IC Role / Device Role / Timing Role: Low-latency ASK transmitter - leverages fast RX/TX switching (500 µs) and programmable PA ramping to meet regulatory spectral mask requirements. Use Value: Programmable output power (–12 to +14.5 dBm) allows fine-tuning for regional regulations; ASK shaping reduces out-of-band emissions without external filters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UHF transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ATA5832-WNQW | 20 KB user ROM instead of flash; no field-upgradable firmware | Suitable for high-volume, fixed-function RKE fobs where firmware never changes | Select ATA5832-WNQW when production volume justifies ROM mask cost and firmware stability is guaranteed |
| ATA5780N-SSU | Receiver-only (no TX); 16 KB ROM; no embedded AVR core | Vehicle-side receiver in RKE systems requiring only telegram decoding, not transmission | Choose ATA5780N-SSU for cost-sensitive ECU-side receivers where transmit capability is unnecessary |
Compared with ATA5832-WNQW, the ATA5831-WNQW enables post-production firmware updates and custom feature development; compared with ATA5780N-SSU, it adds full transceiver functionality and autonomous processing - making it optimal for compact, intelligent endpoints like key fobs and TPMS sensors.
Availability
ATA5831-WNQW is available at Aetrix Electronics and suitable for remote keyless entry (RKE), passive entry go (PEG), and tire pressure monitoring system (TPMS) applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for ATA5831-WNQW 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 ATA5831 family. The company specializes in microcontrollers, analog, and connectivity solutions for automotive, industrial, and consumer markets.
The ATA5831-WNQW belongs to Microchip's UHF transceiver product line, designed specifically for secure, ultra-low-power wireless communication in automotive access and telemetry systems - emphasizing RF performance, firmware flexibility, and qualification to AEC-Q100 Grade 2 (–40°C to +105°C).
FAQ
What is the primary function of the ATA5831-WNQW in a remote keyless entry system?
The ATA5831-WNQW serves as the complete radio subsystem in RKE fobs - integrating RF transceiver, 8-bit AVR microcontroller, 20 KB flash for custom firmware, and hardware accelerators for ASK/FSK modulation, preamble detection, and wake-up. It replaces discrete RF ICs plus external MCUs, reducing BOM count and power consumption while enabling OEM-specific security algorithms directly on the ATA5831-WNQW.
Does the ATA5831-WNQW support both 315 MHz and 868 MHz operation with the same crystal?
Yes, the ATA5831-WNQW supports 315.00 MHz, 433.92 MHz, 868.30 MHz, and 915.00 MHz using a single 24.305 MHz crystal. Its fractional-N PLL achieves 93 Hz resolution in low-band (310–477 MHz) and 185 Hz in high-band (836–956 MHz), allowing precise channel selection across all target ISM bands without crystal swapping or external synthesizers.
How does the ATA5831-WNQW achieve ultra-low OFFMode current of 5 nA?
The ATA5831-WNQW achieves 5 nA typical OFFMode current through dedicated power gating, retention-free shutdown of all analog and digital blocks except NPWRON pins, and biasing of PC1–PC5 and PB7 with VS rather than DVCC. Even with DVCC off, these pins remain active to detect wake events - a design confirmed in Section 1.2 of the summary datasheet and validated in 3V key fob reference designs.
Can the ATA5831-WNQW replace the ATA5830N without hardware changes?
Yes, the ATA5831-WNQW is backward package- and pin-to-pin compatible with the ATA5830N, including identical QFN32 footprint, pin functions, and RF matching network requirements. The summary datasheet explicitly states "backward RF matching compatibility" - meaning no PCB redesign or RF circuit modification is needed when upgrading from ATA5830N to ATA5831-WNQW.
What interfaces does the ATA5831-WNQW provide for host microcontroller communication?
The ATA5831-WNQW communicates exclusively via a 4-wire SPI interface (SCK, MOSI, MISO, NSS) operating up to 500 kbit/s in burst mode. It does not support I²C, UART, or USB. Configuration, data transfer, and mode control are performed through SPI commands defined in the firmware API; the EVENT pin (PB6) signals asynchronous events like telegram reception to simplify host polling.
ATA5831-WNQW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- TxRx + MCU
- RF Family/Standard:
- General ISM < 1GHz
- Protocol:
- -
- Modulation:
- ASK, FSK
- Frequency:
- 315MHz, 434MHz, 868MHz, 915MHz
- Data Rate (Max):
- 120kbps
- Power - Output:
- 14.5dBm
- Sensitivity:
- -125dBm
- Memory Size:
- 20kB Flash, 24kB ROM, 1kB SRAM
- Serial Interfaces:
- SPI
- GPIO:
- 2
- Voltage - Supply:
- 1.9V ~ 3.6V, 2.4V ~ 5.5V
- Current - Receiving:
- 9.8mA
- Current - Transmitting:
- 9.4mA ~ 13.8mA
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 32-QFN (5x5)
ATA5831-WNQW FAQ
1.How can I place an order for ATA5831-WNQW through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5831-WNQW 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 ATA5831-WNQW reliable?
The price and inventory of ATA5831-WNQW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5831-WNQW is usually 5 days.
3.What payment methods are accepted for ATA5831-WNQW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5831-WNQW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5831-WNQW?
ATA5831-WNQW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5831-WNQW 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 ATA5831-WNQW?
For technical support, including ATA5831-WNQW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5831-WNQW requirements.
6.How does Aetrix verify that ATA5831-WNQW is sourced from the original manufacturer or authorized distributors?
All ATA5831-WNQW 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 ATA5831-WNQW meets industry standards.
7.What is the process for return or replacement of ATA5831-WNQW?
All ATA5831-WNQW units undergo pre-shipment inspection (PSI). If there is an issue with ATA5831-WNQW, 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 ATA5831-WNQW part is unused and in its original packaging.
Return procedure for ATA5831-WNQW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATA5831-WNQW Tags
-
ESP32-D0WD-V3
Espressif Systems
-
ESP8266EX
Espressif Systems
-
ESP32-S3
Espressif Systems
-
NRF24L01P-R7
Nordic Semiconductor ASA
-
NRF24L01P-R
Nordic Semiconductor ASA
-
ESP32-U4WDH
Espressif Systems
-
DA14531-00000OG2
Renesas
-
ESP32-C6FH4
Espressif Systems
-
DA14531-00000FX2
Renesas
-
NRF24L01P-T
Nordic Semiconductor ASA
-
NRF52810-QCAA-R
Nordic Semiconductor ASA
-
ESP32-S3FN8
Espressif Systems
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
