My Inquiry
My Account
Microchip Technology MCP2035T-I/ST
- Part No.:
- MCP2035T-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- RF Front End (LNA + PA)
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MCP2035T-I/ST.pdf
- Description:
- IC AFE TRANSPONDER 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,110
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MCP2035T-I/ST from Microchip Technology is a single-channel low-frequency (125 kHz) analog front-end IC for BodyCom transponder communication, featuring 3 mVPP typical input sensitivity, 8% minimum modulation depth detection, and programmable RSSI output current up to 100 µA. It operates in industrial temperature range (–40°C to +85°C) with 10 µA typical active current and supports LF talk-back via LCX pin clamping.
For engineers reviewing the MCP2035T-I/ST datasheet, MCP2035T-I/ST pinout, MCP2035T-I/ST application, or MCP2035T-I/ST equivalent, this device serves as a dedicated AFE for secure short-range wireless identification systems requiring ultra-low-power wake-up, adaptive gain control, and configurable output enable filtering for noise immunity in automotive body electronics.
Technical Context
The MCP2035T-I/ST implements an integrated analog signal chain with RF limiter, AGC loop, demodulator, and programmable tuning capacitors (0–63 pF, 1 pF/step) for precise LC antenna resonance alignment at 125 kHz. Its internal 32 kHz RC oscillator drives timing-critical functions including AGC stabilization (3.5 ms), inactivity timer (16 ms), and nine selectable output enable filters.
It uses a modified 3-wire SPI interface (CS, SCLK/ALERT, LFDATA/CCLK/SDIO) for register configuration and status readback, with all eight volatile configuration registers accessible except the read-only STATUS register. Output selection (demodulated data, carrier clock, or RSSI) is controlled by Configuration Register bits, with LFDATA and CCLK sharing one pin and RSSI on a dedicated current-sink output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Carrier Frequency | 125 kHz - precisely matched to ISO 11784/11785 LF RFID and BodyCom standards |
| Input Sensitivity | 3 mVPP typical - enables reliable detection of weak signals from small or misaligned antennas |
| Modulation Depth Support | As low as 8% - accommodates degraded signal integrity in metal-rich automotive environments |
| Active Current | 10 µA typical - sustains multi-year battery life in passive transponder nodes |
| Tuning Capacitance Range | 0–63 pF in 1 pF steps - allows fine-tuning of external LC tank without discrete capacitor changes |
| Output Enable Filter Options | Nine programmable timing configurations - provides configurable wake-up window rejection of spurious pulses |
| RSSI Output Linearity | ±15% error - delivers calibrated signal strength indication for proximity estimation and link quality monitoring |
Pinout & Package
Package: 14-pin TSSOP (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 VSS | Power Ground | Dual ground pins reduce impedance path for analog/digital return currents and improve noise immunity |
| 2 CS | Digital Input / SPI Chip Select | High = normal operation (LFDATA/RSSI active); low = SPI programming mode; open-drain with internal pull-up |
| 3 SCLK/ALERT | Shared Clock Input / Fault Indicator | Functions as SPI clock when CS low; asserts open-drain low on parity error or 32 ms alarm timeout |
| 4 RSSI | Analog Current Output | Sinks linear current (0.65–100 µA) proportional to input signal amplitude; requires external load resistor |
| 6 LFDATA/CCLK/SDIO | Tri-function I/O Pin | Outputs demodulated NRZ data or 125 kHz/31.25 kHz carrier clock; serves as bidirectional SPI data line |
| 7, 8 VDD | Positive Supply | Dual VDD pins support stable 2.0–3.6 V supply with local 0.1 µF bypassing per pin |
| 11 LCX | LC Antenna Input | High-impedance (800 kΩ) resonant input with RF limiter (300–700 Ω turn-on resistance) and de-Q'ing capability |
| 13 LCCOM | Antenna Common Reference | Provides differential reference for LCX; must be connected to VSS or external bias point per application |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional LF Talk-Back | Enables transponder response via dynamic clamping/unclamping of LCX voltage-no separate transmit path required |
| Programmable Output Enable Filter | Nine timing configurations (1–10 ms total window) reject false triggers from EMI or coil ringing in automotive environments |
| AGC Stabilization Time | 3.5 ms initialization ensures consistent demodulation across varying field strengths without manual gain adjustment |
| Volatile Configuration Registers | Eight user-accessible registers allow runtime reconfiguration of modulation depth threshold, filter timing, and output mode |
| Ultra-Low Standby Current | 2 µA typical enables always-on listening in battery-powered access fobs and smart keys without compromising shelf life |
Applications
| Automotive Keyless Entry | Secure Access Fob Authentication |
|---|---|
Use Scenario: Passive key fob detects vehicle's 125 kHz challenge signal while inside pocket or bag. IC Role / Device Role / Timing Role: MCP2035T-I/ST acts as the LF receiver front-end, performing AGC, demodulation, and RSSI generation before MCU processing. Use Value: 3 mVPP sensitivity ensures reliable wake-up even with antenna detuning caused by hand/body proximity. |
Use Scenario: Fob responds to vehicle ECU challenge with encrypted reply using LF back-channel. IC Role / Device Role / Timing Role: MCP2035T-I/ST provides LF talk-back capability by modulating LCX voltage under MCU command. Use Value: Integrated modulation transistor (50 Ω RON) enables clean, low-distortion response without external components. |
| Body Electronics Proximity Sensing | Industrial Asset Tagging |
Use Scenario: Door handle detects authorized user presence via LF field perturbation before unlocking. IC Role / Device Role / Timing Role: MCP2035T-I/ST monitors RSSI level and triggers MCU only when signal exceeds threshold-reducing system power. Use Value: ±15% RSSI linearity supports accurate distance estimation for hands-free activation zones. |
Use Scenario: Maintenance technician scans metal-enclosed equipment with handheld reader. IC Role / Device Role / Timing Role: MCP2035T-I/ST receives 125 kHz interrogation and returns ID via demodulated data on LFDATA pin. Use Value: 8% minimum modulation depth tolerance maintains link integrity despite shielding-induced signal attenuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-frequency analog front-end applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDK IAM-85020 | Integrated 134.2 kHz receiver with fixed 10 mVPP sensitivity; no programmable tuning capacitors or RSSI output | Limited to fixed-frequency systems; lacks LF talk-back and digital configurability | Select when cost-sensitive, single-frequency designs require minimal BOM count and no field calibration |
| NXP UCODE I2C | Passive NFC tag IC (13.56 MHz); no LF receive capability; requires external reader field for power and communication | Operates in HF band only; incompatible with 125 kHz BodyCom infrastructure | Select only for HF-based asset tracking where LF interoperability is not required |
Compared with TDk IAM-85020 and NXP UCODE I2C, the MCP2035T-I/ST uniquely combines 125 kHz reception, programmable antenna tuning, RSSI feedback, and LF talk-back in a single ultra-low-power AFE-making it irreplaceable for automotive BodyCom systems requiring adaptive, bidirectional communication.
Availability
MCP2035T-I/ST is available at Aetrix Electronics and suitable for automotive keyless entry systems, secure access fobs, body electronics proximity sensing, and industrial asset tagging requiring stable component supply across extended product lifecycles.
Supply support for MCP2035T-I/ST 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 for embedded control applications.
The MCP2035T-I/ST belongs to Microchip's BodyCom AFE product line, designed specifically for ultra-low-power, high-sensitivity 125 kHz transponder interfaces in automotive and secure access systems.
FAQ
What is the primary function of the MCP2035T-I/ST in a BodyCom system?
The MCP2035T-I/ST serves as the analog front-end receiver for 125 kHz low-frequency communication in BodyCom systems. It detects incoming carrier signals, performs automatic gain control, demodulates amplitude-modulated data, and optionally outputs RSSI current or carrier clock. Its integrated LF talk-back capability enables bidirectional communication through the same LCX antenna pin, eliminating the need for separate transmit circuitry in passive transponders like key fobs.
How does the MCP2035T-I/ST achieve ultra-low power consumption in standby mode?
The MCP2035T-I/ST achieves 2 µA typical standby current by disabling internal analog blocks while maintaining wake-up readiness on the LCX input. Its internal 32 kHz RC oscillator remains active to drive timing-critical functions such as the inactivity timer and AGC initialization, and the device exits standby within 50 ms of valid signal detection. This architecture enables multi-year battery life in applications like automotive smart keys without sacrificing responsiveness.
Can the MCP2035T-I/ST be used with different LC antenna configurations?
Yes-the MCP2035T-I/ST supports flexible LC antenna integration via its programmable internal tuning capacitors (0–63 pF in 1 pF steps), which compensate for parasitic capacitance and allow fine-tuning of resonant frequency to precisely 125 kHz. The LCX input features 800 kΩ impedance and 24 pF parasitic capacitance, and LCCOM provides a configurable common reference. This eliminates the need for external trim capacitors and simplifies PCB layout across varying coil geometries and enclosure materials.
What output modes does the MCP2035T-I/ST support, and how are they selected?
The MCP2035T-I/ST supports three output modes: demodulated data, carrier clock (125 kHz or divided-by-4), and RSSI current. Selection is made via Configuration Register 0 bits <1:0>, with demodulated data and carrier clock routed to the LFDATA/CCLK/SDIO pin and RSSI routed to the dedicated RSSI pin. All modes are mutually exclusive and software-configurable at runtime via the SPI interface, enabling dynamic adaptation to system-level protocol requirements without hardware changes.
Does the MCP2035T-I/ST include protection against overvoltage on the LCX input?
Yes-the MCP2035T-I/ST incorporates an RF limiter on the LCX pin with a turn-on resistance of 300–700 Ω (typical), limiting input voltage to 3–5 VPP under worst-case conditions. It also specifies absolute maximum ratings of 10 VPP (loaded) and 700 VPP (unloaded) on LCX, and includes ESD protection rated at 2000 V HBM. These features safeguard the device during coil resonance overshoot, electrostatic discharge events, or accidental connection to higher-voltage sources in automotive and industrial environments.
MCP2035T-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- RF Type:
- General Purpose
- Frequency:
- 125kHz
- Features:
- 10kbps
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-TSSOP
MCP2035T-I/ST FAQ
1.How can I place an order for MCP2035T-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP2035T-I/ST 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 MCP2035T-I/ST reliable?
The price and inventory of MCP2035T-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP2035T-I/ST is usually 5 days.
3.What payment methods are accepted for MCP2035T-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP2035T-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP2035T-I/ST?
MCP2035T-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP2035T-I/ST 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 MCP2035T-I/ST?
For technical support, including MCP2035T-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP2035T-I/ST requirements.
6.How does Aetrix verify that MCP2035T-I/ST is sourced from the original manufacturer or authorized distributors?
All MCP2035T-I/ST 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 MCP2035T-I/ST meets industry standards.
7.What is the process for return or replacement of MCP2035T-I/ST?
All MCP2035T-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with MCP2035T-I/ST, 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 MCP2035T-I/ST part is unused and in its original packaging.
Return procedure for MCP2035T-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP2035T-I/ST Tags
-
RFX2401C
Skyworks Solutions Inc.
.jpg)
-
NRF21540-QDAA-R
Nordic Semiconductor ASA
-
NRF21540-QDAA-R7
Nordic Semiconductor ASA
-
RFX2411N
Skyworks Solutions Inc.
-
SE2438T-R
Skyworks Solutions Inc.
-
SKY66118-11
Skyworks Solutions Inc.
-
SKY85712-21
Skyworks Solutions Inc.
-
SKY85329-11
Skyworks Solutions Inc.
-
SKY66422-11
Skyworks Solutions Inc.
-
SKY66119-11
Skyworks Solutions Inc.
-
NJG1156PCD-TE1
Nisshinbo Micro Devices Inc.
-
SE2435L-R
Skyworks Solutions Inc.
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…
