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Microchip Technology RFPIC12F675KT-I/SS
- Part No.:
- RFPIC12F675KT-I/SS
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
RFPIC12F675KT-I/SS.pdf
- Description:
- IC MCU 1KX14 RF FSK/ASK 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,269
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Product details
Overview
RFPIC12F675KT-I/SS from Microchip Technology is a FLASH-based 8-bit RISC microcontroller with integrated UHF ASK/FSK transmitter, operating at 290–350 MHz. It features 1024 × 14-word FLASH program memory, 128-byte EEPROM, 10-bit ADC with 4 channels, and 6 GPIO pins with interrupt-on-change - enabling compact remote keyless entry (RKE) transmitters.
For engineers reviewing the RFPIC12F675KT-I/SS datasheet, RFPIC12F675KT-I/SS pinout, RFPIC12F675KT-I/SS application, or RFPIC12F675KT-I/SS equivalent, key selection criteria include integrated RF transmit capability (±1% internal 4 MHz oscillator), low-power sleep current (0.1 µA), FCC Part 15.231/EN 300 220 compliance, and SSOP-20 package compatibility with antenna interface and loop filter support.
Technical Context
The RFPIC12F675KT-I/SS integrates a PICmicro Mid-Range core with dedicated RF subsystem: a crystal oscillator multiplied by 32 drives a VCO phase-locked to quartz reference, enabling narrow-band ASK/FSK transmission up to 40 kbps. Its RFEN control enables precise transmit gating, while REFCLK provides divided crystal output for external receiver synchronization.
On-chip peripherals include Timer0 (8-bit with prescaler), Timer1 (16-bit with gate control and LP oscillator support), analog comparator with 16 internal reference levels, and data EEPROM with 1M write endurance. The device supports In-Circuit Serial Programming™ via ICSPDAT/ICSPCLK pins and wakes from SLEEP in 5 µs at 3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit RISC CPU with 35 instructions; all single-cycle except branches |
| FLASH Memory | 1024 × 14 words - sufficient for firmware + RF protocol stack in sub-GHz RKE systems |
| ADC Resolution | 10-bit, 4-channel - supports battery voltage monitoring and sensor input in wireless sensors |
| RF Frequency Range | 290–350 MHz (K variant) - matches US/EU ISM bands for automotive RKE and alarm systems |
| Transmit Output Power | +10 dBm to –12 dBm in 4 steps - adjustable for range vs. power trade-off in battery-powered remotes |
| Sleep Current | 0.1 µA standby - enables >10-year battery life in tire pressure sensors using coin cells |
| Operating Voltage | 2.0–5.5 V - supports direct operation from 3 V lithium CR2032 or 5 V regulated supply |
Pinout & Package
Package: 20-pin SSOP (Small Outline Package), 0.65 mm pitch, body width 5.3 mm - suitable for space-constrained remote PCBs with RF layout isolation requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD / VSS | Power supply and ground reference | Dual-domain supply: VDD powers digital core; VDDRF/VSSRF isolate RF section to minimize noise coupling |
| GP0–GP5 | Configurable I/O with weak pull-ups | 6 general-purpose pins support ADC inputs (AN0–AN3), comparator (CIN+/CIN−), timer clocks (T0CKI/T1CKI), and ICSP programming (ICSPDAT/ICSPCLK) |
| RFXTAL | RF crystal connection | Drives integrated PLL multiplier (×32); crystal frequency determines final RF carrier (e.g., 9.1875 MHz → 294 MHz) |
| RFEN | RF enable control | Active-high digital input that gates transmitter power amp - enables burst-mode transmission to conserve battery |
| ANT | RF power amplifier output | Direct connection to matching network and PCB trace antenna - requires 50 Ω impedance control |
| LF | Loop filter node | Analog terminal for external RC loop filter - critical for VCO stability and phase noise performance |
| DATAASK / DATAFSK | Modulation data inputs | TTL-level baseband inputs accepting ASK or FSK data streams up to 40 kbps |
| REFCLK | Crystal reference clock output | Divided-by-4 output (on K/F variants) - synchronizes external receiver clock for coherent demodulation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated UHF Transmitter | Eliminates discrete RF front-end components - reduces BOM count and PCB area in RKE fobs |
| FCC/EN Regulatory Compliance | Built-in support for Part 15.231 and EN 300 220 - accelerates certification of end products without external filtering |
| Low-Power Sleep Mode | 0.1 µA standby current enables multi-year operation on CR2032 batteries in wireless sensors |
| Programmable Code Protection | Prevents firmware reverse-engineering in security-critical applications like automotive access systems |
| High-Current I/O Pins | Capable of directly driving LEDs - simplifies status indication without external drivers in remote controls |
Applications
| Automotive Remote Keyless Entry (RKE) | Wireless Tire Pressure Sensors |
|---|---|
Use Scenario: Handheld fob transmitting encrypted door unlock command to vehicle receiver. IC Role / Device Role / Timing Role: Single-chip RKE transmitter generating ASK-modulated 315 MHz signal with wake-on-button-press and fast RF startup. Use Value: Integrated crystal oscillator, VCO, and PA eliminate 12+ external RF components - reducing fob size and assembly cost. |
Use Scenario: Battery-powered sensor mounted inside tire measuring pressure and temperature. IC Role / Device Role / Timing Role: Low-duty-cycle data acquisition node sampling pressure every 30 seconds and transmitting FSK burst via 434 MHz band. Use Value: 0.1 µA standby current and 5 µs wake-up enable >7-year CR2032 battery life while meeting ISO 21848 reliability standards. |
| Garage Door Openers | Burglar Alarm Perimeter Sensors |
Use Scenario: Wall-mounted remote sending secure command to garage controller using rolling code. IC Role / Device Role / Timing Role: Secure transmitter executing AES-128 encryption and ASK modulation with precise timing control over RFEN gating. Use Value: On-chip 128-byte EEPROM stores rolling code counter and keys - eliminating external secure memory IC. |
Use Scenario: Passive infrared (PIR) motion detector transmitting alarm event to central panel. IC Role / Device Role / Timing Role: Event-triggered transmitter waking from deep sleep, acquiring ADC reading from PIR signal chain, then sending FSK packet. Use Value: 10-bit ADC and comparator with 16 reference levels allow analog signal conditioning without external op-amps or references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| rfPIC12F629-I/SS | No integrated RF transmitter; lacks RFXTAL, ANT, RFEN, LF pins and ASK/FSK modulation logic | Requires external RF IC (e.g., MICRF112) - increases BOM and layout complexity | Select when RF frequency flexibility or higher output power (> +10 dBm) is required beyond RFPIC12F675KT-I/SS capabilities |
| STM8L151K4T6 | ARM Cortex-M0+ core, no native RF; requires external transceiver (e.g., SX1231) and crystal oscillator circuit | Higher MCU performance but adds 8+ passive components and RF matching network design effort | Select when migrating to modern low-power ARM architecture with RTOS support and larger memory footprint |
Compared with rfPIC12F629-I/SS and STM8L151K4T6, the RFPIC12F675KT-I/SS delivers lowest system-level integration for sub-GHz ASK/FSK remotes - reducing component count by ≥15 parts and eliminating RF layout tuning, while maintaining Microchip's mature toolchain and qualification for automotive environments.
Availability
RFPIC12F675KT-I/SS is available at Aetrix Electronics and suitable for automotive RKE systems, wireless sensor networks, and building access controllers requiring stable component supply across extended product lifecycles.
Supply support for RFPIC12F675KT-I/SS 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 Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona.
The rfPIC12F675KT-I/SS belongs to Microchip's legacy rfPIC family - designed specifically for ultra-low-cost, single-chip wireless remote control applications in automotive, security, and industrial telemetry markets.
FAQ
What is the RF frequency range supported by the RFPIC12F675KT-I/SS?
The RFPIC12F675KT-I/SS is the K-variant of the rfPIC12F675 family and operates in the 290–350 MHz band. Its final transmit frequency is determined by the external crystal connected to RFXTAL, multiplied by 32 (e.g., 9.1875 MHz crystal yields 294 MHz). This range complies with FCC Part 15.231 and EN 300 220 for license-free operation in keyless entry and alarm systems.
Does the RFPIC12F675KT-I/SS require an external RF power amplifier?
No, the RFPIC12F675KT-I/SS integrates a complete UHF transmitter including crystal oscillator, phase-locked VCO, loop filter interface (LF pin), and RF power amplifier. The ANT pin delivers up to +10 dBm output directly - eliminating need for external PA stages and simplifying regulatory testing for conducted emissions.
How many analog input channels does the RFPIC12F675KT-I/SS ADC support?
The RFPIC12F675KT-I/SS features a 10-bit analog-to-digital converter with four input channels (AN0–AN3), mapped to GP0, GP1, GP2, and GP4 respectively. These channels support single-ended measurements with programmable voltage reference and are commonly used for battery monitoring, temperature sensing, or analog sensor interfacing in wireless remotes.
What is the minimum supply voltage for reliable operation of the RFPIC12F675KT-I/SS?
The RFPIC12F675KT-I/SS operates reliably from 2.0 V to 5.5 V. At 2.0 V, the internal 4 MHz oscillator remains functional within specification, and the 10-bit ADC maintains linearity - enabling use with aging alkaline or lithium primary cells down to end-of-life voltage without brown-out reset.
Can the RFPIC12F675KT-I/SS be programmed in-circuit after soldering to the PCB?
Yes, the RFPIC12F675KT-I/SS supports In-Circuit Serial Programming™ (ICSP™) via GP0 (ICSPDAT) and GP1 (ICSPCLK) pins. This allows firmware updates and calibration writes without removing the device, using standard Microchip programmers such as PICkit™ 3 or ICD™ 3 with appropriate SSOP-20 ZIF socket or pogo-pin fixture.
RFPIC12F675KT-I/SS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- PIC®
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Verified
- Applications:
- RKE, Security Systems
- Core Processor:
- PIC
- Program Memory Type:
- FLASH (1.75kB)
- Controller Series:
- rfPIC™
- RAM Size:
- 64 x 8
- Interface:
- -
- Number of I/O:
- 6
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
RFPIC12F675KT-I/SS FAQ
1.How can I place an order for RFPIC12F675KT-I/SS through Aetrix?
Please submit a Request for Quotation (RFQ) for RFPIC12F675KT-I/SS 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 RFPIC12F675KT-I/SS reliable?
The price and inventory of RFPIC12F675KT-I/SS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RFPIC12F675KT-I/SS is usually 5 days.
3.What payment methods are accepted for RFPIC12F675KT-I/SS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RFPIC12F675KT-I/SS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RFPIC12F675KT-I/SS?
RFPIC12F675KT-I/SS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RFPIC12F675KT-I/SS 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 RFPIC12F675KT-I/SS?
For technical support, including RFPIC12F675KT-I/SS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RFPIC12F675KT-I/SS requirements.
6.How does Aetrix verify that RFPIC12F675KT-I/SS is sourced from the original manufacturer or authorized distributors?
All RFPIC12F675KT-I/SS 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 RFPIC12F675KT-I/SS meets industry standards.
7.What is the process for return or replacement of RFPIC12F675KT-I/SS?
All RFPIC12F675KT-I/SS units undergo pre-shipment inspection (PSI). If there is an issue with RFPIC12F675KT-I/SS, 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 RFPIC12F675KT-I/SS part is unused and in its original packaging.
Return procedure for RFPIC12F675KT-I/SS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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