RFPIC12F675HT-I/SS

Overview

The rfPIC12F675HT-I/SS is a high-performance 8-bit microcontroller integrating a UHF ASK/FSK transmitter, manufactured by Microchip Technology. It features a RISC CPU with 35 single-cycle instructions and operates at frequencies up to 20 MHz using external resonators or crystals, alongside a factory-calibrated internal 4 MHz oscillator. The device includes 1 KB of Flash program memory, 64 bytes of SRAM, and 128 bytes of EEPROM data memory. Key peripherals comprise four 10-bit ADC channels, an analog comparator, two timers (Timer0 and Timer1), and six general-purpose I/O pins. The integrated RF section supports output power from +10 dBm to -12 dBm across the 850-930 MHz band.

Feature Summary

• Integrated UHF ASK/FSK Transmitter: Supports data rates up to 40 Kbps with adjustable output power (+10 dBm to -12 dBm) for the 850-930 MHz frequency range.
• High-Performance RISC CPU: Features a 13-bit program counter, 8-level deep hardware stack, and 35 single-cycle instructions operating up to 20 MHz.
• Comprehensive Memory Architecture: Includes 1024 x 14 words of Flash program memory, 64 x 8 bytes of SRAM, and 128 x 8 bytes of EEPROM with high endurance ratings.
• Analog and Digital Peripherals: Equipped with a 10-bit A/D converter (4 channels), an analog comparator with 16 internal reference levels, Timer0, and Timer1.

Applications

• Automotive Remote Keyless Entry (RKE) systems
• Automotive alarm systems
• Community gate and garage door openers
• Burglar alarm systems
• Building access control

Procurement Notes

Verify the specific suffix 'H' confirms the 850-930 MHz operational frequency band as defined in the device selection table. Confirm the 'I' designation indicates the industrial temperature range (-40°C to +85°C). Ensure the 'T' suffix corresponds to the tube packaging format specified in the datasheet's packaging information section. Cross-reference the full part number against the latest Microchip documentation to confirm current production status and availability.

Selection Notes

Select this component when designing short-range wireless applications requiring integration of MCU and RF transmission in a single package. The 850-930 MHz variant is suitable for regions where lower ISM bands are restricted. Consider the 20-pin SSOP package constraints for PCB layout. Ensure the application voltage stays within the 2.0V to 5.5V range and that the crystal frequency selected aligns with the required transmit frequency multiplied by 32.

Part Context

The rfPIC12F675 belongs to the rfPIC12F675 family, which differentiates models by operating frequency: 'K' for 290-350 MHz, 'F' for 380-450 MHz, and 'H' for 850-930 MHz. This specific model integrates the standard PIC12F675 microcontroller core with a UHF transmitter optimized for higher frequency bands. It shares architectural similarities with other mid-range PIC devices but adds dedicated RF control logic and power amplifiers.

Replacement Considerations

Direct replacements must match the 850-930 MHz frequency band and 20-pin SSOP package. Models such as rfPIC12F675F or rfPIC12F675K operate on different frequency ranges and are not electrically compatible for RF transmission. Standard PIC12F675 variants lack the integrated transmitter and cannot serve as drop-in replacements for RF functions.