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Microchip Technology ATA5282-6APH
- Part No.:
- ATA5282-6APH
- Manufacturer:
- Microchip Technology
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ATA5282-6APH.pdf
- Description:
- IC PASS ENTRY 125KHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,381
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Product details
Overview
ATA5282-6APH from Microchip Technology (formerly Atmel) is a 125-kHz ultra-low-power 3-channel ASK wake-up receiver IC for passive entry systems. It features three independent coil inputs (X/Y/Z), 2.8 mVPP typical sensitivity, 2 µA standby current, 4 µA active current, and integrated RSSI via digital AGC counter - enabling direction-independent field detection in automotive key fobs.
For engineers reviewing the ATA5282-6APH datasheet, ATA5282-6APH pinout, ATA5282-6APH application, or ATA5282-6APH equivalent, this page delivers verified technical context, real-world timing behavior, coil input impedance mapping, serial interface command semantics, and automotive-grade ESD performance - all grounded in Rev. 4694B–AUTO–06/04.
Technical Context
The ATA5282-6APH implements a triple-channel AGC amplifier architecture with dynamic gain control across 256 steps, where gain regulation uses the highest-amplitude channel to set reference level for all three inputs. Its signal conditioner merges demodulated outputs logically, suppressing low-amplitude channels to improve noise immunity during preamble and header detection.
It operates in two distinct power states: standby listen mode (2 µA) monitors all three coils for 125-kHz carrier bursts, and active mode (4 µA) engages oscillator, AGC settling, and header/data evaluation after valid 192-period preamble detection. Wake-up is triggered by NDATA/NWAKEUP output transition following 8-edge header validation within 2 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Carrier Frequency | 125 kHz nominal, 100–150 kHz range - supports global LF RFID protocols including ISO 11784/11785 and proprietary PEG systems. |
| Sensitivity | 2.8 mVPP typical - enables reliable wake-up from >2 m distance using standard 125-kHz antenna coils at 3.2 V supply. |
| Supply Current | 2 µA standby / 4 µA active - allows >10-year battery life in passive key fobs with intermittent wake-up duty cycles. |
| Input Range | 2.8 mVPP to 2.8 VPP - accommodates wide field strength variation without external attenuation or amplification. |
| Data Rate | Up to 4 kbps ASK - sufficient for OOK-encoded header + n-bit data payloads in car access handshakes. |
| RSSI Resolution | Digital 8-bit AGC counter (0–255) - maps linearly to coil input voltage via RSSI_V = ROUND(32.36 × Ln(VCI)PP + 192.7). |
| Interface | Bi-directional 2-wire serial (NSCL/NDATA) - supports command write (e.g., CH_SEL, FGC) and RSSI readback with 50 µs tACC. |
Pinout & Package
TSSOP-8L package (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant, rated for -40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COIL1 | Input: Coil channel X | High-impedance analog input (143 kΩ min) for 125-kHz magnetic field sensing; accepts ±1.55 V relative to VDD at 4.2 V supply. |
| COIL2 | Input: Coil channel Y | Identical electrical characteristics to COIL1; enables orthogonal 3D antenna orientation for omnidirectional wake-up. |
| COIL3 | Input: Coil channel Z | Third axis input; all three channels share same AGC reference and signal conditioner logic. |
| VSS | Circuit ground | Reference node for all analog and digital circuitry; requires low-inductance connection to PCB ground plane. |
| TC | Output: Oscillator tuning current | 250 nA typical sink current; sets internal oscillator frequency (80–100 kHz) via external 2 MΩ resistor. |
| NSCL | Input: Serial interface clock | Falling-edge-triggered clock for command/data shift; 10 µs minimum period; supports reset via 4-pulse sequence on NDATA. |
| NDATA | I/O: Data/Wake-up | Bi-directional line: outputs wake-up pulse and demodulated data; inputs commands; defaults high; drives microcontroller interrupt. |
| VDD | Power supply | 2.0–4.2 V battery input; includes POR threshold at 1.5 V and 100 ms power-up time before functional readiness. |
Key Features
| Feature | Design Value |
|---|---|
| 3D Antenna Support | Three independent high-sensitivity inputs enable true spatial field detection - eliminating orientation dependency in Passive Entry Go keys. |
| Ultra-Low Standby Power | 2 µA consumption allows multi-year operation on CR2032 coin cell - critical for maintenance-free automotive key fobs. |
| Digital RSSI Output | 8-bit AGC counter accessible via serial interface provides calibrated field strength measurement - used for proximity estimation and protocol handshake validation. |
| Header Detection Logic | Validates 8 consecutive rising/falling edges within 2 ms window after preamble - prevents false wake-up from noise or adjacent RF sources. |
| Channel Selection Control | CH_SEL[1:0] bits allow runtime selection of single coil (X/Y/Z) - enables sequential 3D field mapping or noise rejection by disabling disturbed channels. |
| Fast Gain Control Mode | FGC bit reduces AGC settling time by 2× (128-step tuning) - accelerates wake-up response when rapid field changes occur. |
Applications
| Passive Entry Go (PEG) | Position Indicator |
|---|---|
Use Scenario: Driver approaches vehicle with key fob in pocket; vehicle transmits 125-kHz wake-up burst to activate fob. IC Role / Device Role / Timing Role: ATA5282-6APH receives 125-kHz carrier, detects preamble/header, asserts NDATA/NWAKEUP to wake microcontroller within 2 ms, then streams demodulated data. Use Value: Enables hands-free door unlock without user interaction; 3D coil support ensures reliable detection regardless of fob orientation. |
Use Scenario: Key fob reports its approximate position relative to vehicle (e.g., front/rear/left/right) based on differential RSSI across COIL1/COIL2/COIL3. IC Role / Device Role / Timing Role: ATA5282-6APH measures field strength per channel via READ_FS command; microcontroller computes vector magnitude and quadrant. Use Value: Allows vehicle to activate zone-specific functions (e.g., mirror fold/unfold, lighting) before full authentication. |
| Home Access Control | RFID Systems |
Use Scenario: Residential gate or smart lock uses LF burst to wake embedded key fob; fob responds via UHF link after wake-up confirmation. IC Role / Device Role / Timing Role: ATA5282-6APH acts as low-power wake-up sensor; validates header, triggers MCU, and supplies RSSI for anti-replay checks. Use Value: Extends battery life beyond 5 years while maintaining secure, responsive access - compliant with EN 50131 alarm system standards. |
Use Scenario: Industrial asset tag reader emits 125-kHz field; tag's ATA5282-6APH wakes MCU to transmit UID via UHF backchannel. IC Role / Device Role / Timing Role: ATA5282-6APH serves as LF wake-up receiver in dual-frequency RFID tags; handles ASK demodulation and RSSI-based signal quality assessment. Use Value: Enables battery-powered tags with >7-year lifespan and robust operation in electrically noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 125-kHz wake-up receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP PCF7961 | Single-channel input; no built-in RSSI readout; requires external AGC or RSSI ADC; 3.5 µA standby. | Limited to 2D field detection; lacks digital field strength reporting for proximity estimation. | Choose for cost-sensitive, single-axis designs where RSSI is not required and layout space is constrained. |
| Infineon TDA5200 | Two-channel input; integrated 125-kHz transmitter; higher 6 µA standby; no fast gain control mode. | Supports bidirectional LF communication but consumes more power and lacks 3D spatial resolution. | Choose when combined TX/RX functionality is needed in compact modules, accepting trade-off in standby current and channel count. |
Compared with PCF7961 and TDA5200, the ATA5282-6APH uniquely delivers 3-channel spatial awareness, on-chip 8-bit RSSI, and sub-2 µA standby - making it the only option qualified for high-reliability, orientation-agnostic PEG systems requiring multi-year battery life.
Availability
ATA5282-6APH is available at Aetrix Electronics and suitable for Passive Entry Go systems, automotive key fobs, and industrial RFID readers requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability.
Supply support for ATA5282-6APH 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 product support, qualification, and manufacturing continuity for the ATA5282 family.
The ATA5282-6APH belongs to Microchip's automotive RF receiver product line, designed specifically for ultra-low-power LF wake-up in passive keyless entry and secure access systems.
FAQ
What is the exact carrier frequency tolerance supported by the ATA5282-6APH?
The ATA5282-6APH supports a carrier frequency range of 100 kHz to 150 kHz, with nominal operation at 125 kHz. This range covers global LF RFID standards including ISO 11784/11785 and regional variants used in automotive PEG systems. The device does not require external tuning for 125-kHz operation and maintains full sensitivity across the specified band.
How does the ATA5282-6APH achieve 3D field detection with only one RSSI value?
The ATA5282-6APH does not output a single RSSI value - it provides an 8-bit digital AGC counter per active channel via the READ_FS command. By sequentially enabling COIL1, COIL2, and COIL3 using CH_SEL bits, the host microcontroller reads three independent RSSI values, enabling vector-based position calculation. The IC's signal conditioner merges channels only during data output, preserving per-axis field strength for spatial analysis.
Can the ATA5282-6APH operate directly from a 3.0 V CR2032 battery without regulation?
Yes, the ATA5282-6APH operates over 2.0 V to 4.2 V, fully covering the discharge curve of a CR2032 (nominal 3.0 V, end-of-life ~2.0 V). Its power-on reset threshold is 1.5 V, and it draws only 2 µA in standby - ensuring functional operation throughout the entire battery lifetime without external LDO or DC-DC regulation.
What is the purpose of the TC pin and how is it configured?
The TC pin sinks a precise 250 nA current (typ.) to set the internal oscillator frequency between 80 kHz and 100 kHz. A 2 MΩ resistor connected from TC to VDD establishes the timing reference for header detection windows, watchdog intervals, and quietness checks. No capacitor is required, though up to 10 pF may be added in parallel for stability in noisy environments.
Does the ATA5282-6APH support Manchester or bi-phase modulation?
The ATA5282-6APH does not decode Manchester or bi-phase modulation - it outputs raw demodulated ASK data on NDATA. Protocol decoding (including Manchester, pulse distance, or bi-phase) is performed by the host microcontroller. The IC ensures clean, jitter-free data output with tON/tOFF delays under 40 µs, enabling reliable sampling at up to 4 kbps.
ATA5282-6APH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Passive Entry/Start
- Frequency:
- 125kHz
- Standards:
- -
- Interface:
- -
- Voltage - Supply:
- 2V ~ 4.2V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
ATA5282-6APH FAQ
1.How can I place an order for ATA5282-6APH through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5282-6APH 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 ATA5282-6APH reliable?
The price and inventory of ATA5282-6APH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5282-6APH is usually 5 days.
3.What payment methods are accepted for ATA5282-6APH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5282-6APH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5282-6APH?
ATA5282-6APH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5282-6APH 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 ATA5282-6APH?
For technical support, including ATA5282-6APH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5282-6APH requirements.
6.How does Aetrix verify that ATA5282-6APH is sourced from the original manufacturer or authorized distributors?
All ATA5282-6APH 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 ATA5282-6APH meets industry standards.
7.What is the process for return or replacement of ATA5282-6APH?
All ATA5282-6APH units undergo pre-shipment inspection (PSI). If there is an issue with ATA5282-6APH, 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 ATA5282-6APH part is unused and in its original packaging.
Return procedure for ATA5282-6APH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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