My Inquiry
My Account
Microchip Technology U2270B-MFPY
- Part No.:
- U2270B-MFPY
- Manufacturer:
- Microchip Technology
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
U2270B-MFPY.pdf
- Description:
- IC RFID READER 100-150KHZ 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,913
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
U2270B-MFPY from Atmel is a contactless IDIC® read/write base station IC for 125 kHz RFID systems, integrating oscillator, coil driver, low-pass filter, amplifier, and Schmitt trigger. It delivers up to 4.7 VPP driver output in battery-voltage mode, supports Manchester/bi-phase modulation at up to 5 Kbaud, and provides microcontroller-compatible data I/O with standby current as low as 30 µA - optimized for automotive immobilizer transceivers.
For engineers reviewing the U2270B-MFPY datasheet, U2270B-MFPY pinout, U2270B-MFPY application, or U2270B-MFPY equivalent, key selection criteria include carrier frequency tuning via RF pin resistor (110 kΩ for 125 kHz), differential vs. common-mode coil drive configuration (MS pin controlled), and three distinct power supply modes (one-rail, two-rail, battery-voltage) enabling design flexibility across coupling distances and ECU integration requirements.
Technical Context
The U2270B-MFPY implements an integrated 100–150 kHz oscillator whose frequency is set by a resistor between RF (pin 15) and VS (pin 14); typical 125 kHz operation uses 110 kΩ. Its dual-coil driver supports both common-mode (co-phased outputs) and differential-mode (anti-phased outputs) configurations via MS pin control, enabling higher magnetic field strength or improved system sensitivity depending on antenna impedance.
Signal conditioning includes a 4th-order Butterworth low-pass filter (typical fCUT = 7 kHz at 125 kHz carrier), a fixed-gain (typ. 30×) differential amplifier with HIPASS DC decoupling, and a Schmitt trigger with 100 mV hysteresis and open-collector output enabled by OE pin - all designed to convert weak transponder signals into robust digital logic levels for MCU interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Carrier Frequency | 100–150 kHz, adjustable via external resistor on RF pin; 125 kHz nominal with 110 kΩ sets resonance for standard immobilizer coils. |
| Data Rate Support | Up to 5 Kbaud using Manchester or bi-phase encoding; enables reliable communication with ISO/IEC 11784/11785-compliant transponders. |
| Driver Output Swing | Up to 4.7 VPP (battery-voltage mode, IL = ±100 mA); sufficient to energize 1.35 mH antenna coils at d ≈ 10 cm with diode feedback + fine tuning. |
| Supply Modes | Three validated configurations: one-rail (5 V only), two-rail (5 V + 7–8 V), or battery-voltage (7–16 V input, internal VS/VEXT generation). |
| Standby Current | 30–70 µA (12 V supply); enables ultra-low-power wake-on-field operation in vehicle ECU sleep states. |
| Operating Temperature | –40 °C to +105 °C ambient; qualified for under-hood automotive environments per AEC-Q100 not required but functionally aligned. |
| Package | SO16 (5.0 × 10.0 mm, 1.27 mm pitch); Pb-free, tube-packaged, compatible with standard reflow profiles. |
Pinout & Package
U2270B-MFPY is housed in a 16-pin SOIC package (SO16) with standard 1.27 mm pitch, 5.0 mm width, and 10.0 mm length. Pin 1 is marked by a notch or dot; thermal resistance RthJA = 120 K/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Ground reference | Main signal ground; must be connected to DGND (7) for stable driver operation. |
| OUTPUT (2) | Data output | Open-collector output; requires pull-up to MCU VDD; active when OE = low. |
| OE (3) | Output enable | Active-low control; disables OUTPUT during standby or MCU reset sequences. |
| INPUT (4) | Data input | AC-coupled transponder signal input; clamped ±2 V, 220 kΩ input resistance. |
| MS (5) | Mode select | Selects COIL1/COIL2 drive mode: low = common mode, high = differential mode. |
| CFE (6) | Carrier frequency enable | Enables RF field interruption for write commands to crypto transponders. |
| DGND (7) | Driver ground | Separate ground for coil driver stage; must be tied to GND (1) at single point. |
| COIL2 (8) | Coil driver 2 output | Drives second coil terminal; polarity relative to COIL1 determined by MS pin. |
| COIL1 (9) | Coil driver 1 output | Drives first coil terminal; forms resonant tank with external capacitor and coil. |
| VEXT (10) | External power supply | Provides up to 10 mA at 4.6–5.4 V; powers external MCU or pre-driver transistor. |
| DVS (11) | Driver supply voltage | Input for coil driver stage; accepts 4.5–8 V in two-rail/battery modes. |
| VBatt (12) | Battery voltage input | Primary input for battery-voltage mode (7–16 V); internally regulated to VS/VEXT. |
| STANDBY (13) | Standby control | Active-low entry to ultra-low-power mode; reduces total current to ≤70 µA. |
| VS (14) | Internal 5 V supply | Stable 4.6–6.3 V output for core logic; switched off in standby; requires 47 µF bypass. |
| RF (15) | Frequency adjustment | Current-input oscillator control; 110 kΩ to VS sets 125 kHz; tolerance affects field stability. |
| HIPASS (16) | DC decoupling | Connects external CHP capacitor (e.g., 100 nF) to set amplifier high-pass cutoff. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode coil driver | Configurable common/differential drive via MS pin - differential mode increases effective coil voltage and improves read range by ~30% at same current. |
| Integrated 4th-order LPF | Butterworth filter with fCUT ≈ 7 kHz at 125 kHz carrier - suppresses residual RF while preserving bi-phase/Manchester data integrity. |
| On-chip power supply | Generates VS (5 V) and VEXT (5 V) from 7–16 V VBatt - eliminates need for external regulators in automotive battery-powered designs. |
| Microcontroller interface support | Open-collector OUTPUT with 400 mV VCE(sat), OE-controlled enable, and 100 mV Schmitt hysteresis - directly interfaces with 3.3 V/5 V MCUs without level shifters. |
| Tuning-capable oscillator | RF pin accepts precision resistor (±1%) to lock carrier to 125 kHz ±3% - compensates for coil tolerance and temperature drift in production. |
Applications
| Car Immobilizer Systems | Animal Identification |
|---|---|
|
Use Scenario: Embedded in vehicle ECU to energize passive transponder in ignition key and verify cryptographic challenge-response. IC Role / Device Role / Timing Role: Base station transceiver generating 125 kHz RF field, demodulating backscattered transponder data, and delivering Manchester-decoded bits to security MCU. Use Value: Enables secure, contactless authentication with <10 cm read range; standby current ≤70 µA minimizes parasitic drain during vehicle off-state. |
Use Scenario: Integrated into handheld scanners or fixed gate readers for livestock or pet identification tags implanted subcutaneously. IC Role / Device Role / Timing Role: Low-power RFID base station driving small-area loop antennas (≤10 cm diameter) to interrogate ISO 11784 FDX-B transponders. Use Value: Battery-voltage operation (7–16 V) allows direct use of 9 V alkaline or Li-ion packs; differential coil drive extends read distance in variable coupling environments. |
| Access Control Readers | Industrial Process Control |
|
Use Scenario: Mounted in door controllers or turnstiles to authenticate employee badges or access tokens in office or facility entry points. IC Role / Device Role / Timing Role: Contactless reader IC providing regulated 5 V (VS) and auxiliary 5 V (VEXT) to power MCU and status LEDs while managing coil resonance. Use Value: One-rail 5 V operation simplifies power design; built-in LPF and Schmitt trigger eliminate need for external signal conditioning components. |
Use Scenario: Installed in automated machinery to identify tooling fixtures, pallets, or workpieces moving through assembly lines or CNC stations. IC Role / Device Role / Timing Role: Robust base station IC operating in industrial ambient (–40 °C to +105 °C), driving tuned coils near metal enclosures with diode feedback compensation. Use Value: Two-rail supply mode (5 V + 7–8 V) boosts magnetic field strength for reliable reads despite electromagnetic noise and metallic interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RFID base station applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SLRC610TR | Integrated NFC controller supporting 13.56 MHz ISO 14443; no 125 kHz capability; requires external 125 kHz frontend for hybrid systems. | Targets contactless payment and smart card readers, not low-frequency immobilizers or animal ID. | Choose SLRC610TR only if migrating to HF/NFC infrastructure; U2270B-MFPY remains optimal for dedicated LF 125 kHz systems. |
| TDA5140A | 125 kHz base station IC with integrated LDO, but lacks differential coil drive and has lower max driver output (3.5 VPP). | Designed for cost-sensitive access control; limited to ≤5 cm range without external boost stages. | Select TDA5140A for compact, low-power readers where range <7 cm suffices; U2270B-MFPY preferred for automotive-grade range and reliability. |
Compared with SLRC610TR and TDA5140A, the U2270B-MFPY uniquely combines differential coil drive, battery-voltage operation with ultra-low standby current, and precise 125 kHz tuning - making it the only choice for production automotive immobilizers requiring >10 cm range and ECU-integrated power architecture.
Availability
U2270B-MFPY is available at Aetrix Electronics and suitable for car immobilizer systems, animal identification readers, access control terminals, and industrial process tracking applications requiring stable component supply, long-term lifecycle support, and automotive-qualified performance.
Supply support for U2270B-MFPY 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
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, touch technologies, and RFID solutions for automotive, industrial, and consumer markets.
The U2270B-MFPY belongs to Atmel's IDIC® RFID base station IC family, engineered specifically for contactless 125 kHz identification systems requiring high magnetic field efficiency, low-power standby, and seamless integration with 8-bit microcontrollers in safety-critical applications.
FAQ
What is the recommended resistor value for 125 kHz operation on the RF pin of the U2270B-MFPY?
The U2270B-MFPY requires a 110 kΩ resistor between RF (pin 15) and VS (pin 14) to achieve nominal 125 kHz carrier frequency. This value is specified in the datasheet's "Oscillator" section and accounts for internal compensation circuitry. Using ±1% tolerance resistors ensures frequency stability within ±3%, critical for reliable transponder interrogation in automotive immobilizer systems. Deviations beyond ±5% may cause read failures due to detuning from coil resonance.
How does the MS pin affect coil driver operation in the U2270B-MFPY?
The MS (Mode Select) pin on the U2270B-MFPY configures the COIL1 and COIL2 outputs as either common-mode (MS = low) or differential-mode (MS = high). In differential mode, the outputs are anti-phased, doubling the effective voltage across the antenna coil and increasing magnetic field strength - essential for achieving >10 cm read range. Common mode is used for higher current drive in low-impedance coil configurations. The U2270B-MFPY's functional table confirms this behavior and links it directly to transponder coupling factor requirements.
Can the U2270B-MFPY operate directly from a 12 V car battery without external regulators?
Yes, the U2270B-MFPY supports battery-voltage operation from 7–16 V applied to VBatt (pin 12). Its internal power supply generates regulated VS (5 V) and VEXT (5 V) outputs, eliminating external regulators. In this mode, STANDBY (pin 13) can reduce total current to ≤70 µA, and VEXT supplies up to 10 mA - sufficient for powering a low-power MCU even in vehicle sleep state. This capability is explicitly validated in Section 3.2.3 and Table 3-1 of the U2270B-MFPY datasheet.
What is the maximum data rate supported by the U2270B-MFPY, and which encoding schemes are compatible?
The U2270B-MFPY supports a maximum data rate of 5 Kbaud using Manchester or bi-phase modulation, as confirmed in the "Features" and "Electrical Characteristics" sections. Its integrated 4th-order Butterworth low-pass filter has a typical cutoff of 7 kHz at 125 kHz carrier, enabling clean recovery of these encoded waveforms. The U2270B-MFPY's signal chain - including amplifier gain (typ. 30×), Schmitt trigger hysteresis (100 mV), and LPF response - is specifically characterized for these encodings, ensuring bit error rates remain low across temperature and supply variations.
Does the U2270B-MFPY include protection against overvoltage on VBatt and VEXT pins?
Yes, the U2270B-MFPY incorporates internal Zener diodes protecting VBatt (pin 12) and VEXT (pin 10) against overvoltage. As documented in Section 3.2.3, these diodes clamp transients up to 16 V on VBatt and 8 V on VEXT, aligning with automotive load-dump and jump-start conditions. Absolute maximum ratings confirm VBatt withstands 16 V continuously, and VEXT tolerates up to 8 V - allowing direct connection to vehicle battery rails without external TVS devices in most implementations. This protection is integral to the U2270B-MFPY's automotive suitability.
U2270B-MFPY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- U2270B
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- RFID Reader
- Frequency:
- 100kHz ~ 150kHz
- Standards:
- -
- Interface:
- -
- Voltage - Supply:
- 8V ~ 16V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
U2270B-MFPY FAQ
1.How can I place an order for U2270B-MFPY through Aetrix?
Please submit a Request for Quotation (RFQ) for U2270B-MFPY 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 U2270B-MFPY reliable?
The price and inventory of U2270B-MFPY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for U2270B-MFPY is usually 5 days.
3.What payment methods are accepted for U2270B-MFPY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for U2270B-MFPY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for U2270B-MFPY?
U2270B-MFPY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your U2270B-MFPY 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 U2270B-MFPY?
For technical support, including U2270B-MFPY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your U2270B-MFPY requirements.
6.How does Aetrix verify that U2270B-MFPY is sourced from the original manufacturer or authorized distributors?
All U2270B-MFPY 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 U2270B-MFPY meets industry standards.
7.What is the process for return or replacement of U2270B-MFPY?
All U2270B-MFPY units undergo pre-shipment inspection (PSI). If there is an issue with U2270B-MFPY, 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 U2270B-MFPY part is unused and in its original packaging.
Return procedure for U2270B-MFPY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
U2270B-MFPY Tags
-
SL2S2602FTBX
NXP Semiconductors
-
ST25DV04K-IER6S3
STMicroelectronics
-
ST25DV04K-IER6C3
STMicroelectronics
-
LXMSJZNCMD-217
Murata Electronics
-
NT3H2111W0FTTJ
NXP Semiconductors
-
NT3H2111W0FHKH
NXP Semiconductors
-
M24LR04E-RMC6T/2
STMicroelectronics
-
ST25DV04KC-JF6D3
STMicroelectronics
-
ST25DV64KC-IE6S3
STMicroelectronics
-
ST25DV64K-IER6T3
STMicroelectronics
-
NT3H2211W0FTTJ
NXP Semiconductors
-
NT3H2211W0FHKH
NXP Semiconductors
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…
