Microchip Technology RFPIC12F675H-I/SS

Overview

RFPIC12F675H-I/SS from Microchip Technology is a FLASH-based 8-bit RISC microcontroller with integrated UHF ASK/FSK transmitter, operating in the 850–930 MHz band. It features 1024 × 14 words of FLASH, 128 bytes of EEPROM, 10-bit ADC (4 channels), dual timers (Timer0/Timer1), analog comparator with 16 reference levels, and 6 programmable I/O pins - enabling compact wireless sensor nodes such as tire pressure monitors and garage door openers.

For engineers reviewing the RFPIC12F675H-I/SS datasheet, RFPIC12F675H-I/SS pinout, RFPIC12F675H-I/SS application, or RFPIC12F675H-I/SS equivalent, key selection criteria include its integrated RF transmitter architecture (VCO + loop filter + PA), REFCLK/8 output for H-band operation, 20-pin SSOP package, FCC Part 15.231/EN 300 220 compliance, and low-power SLEEP mode (0.1 µA standby).

Technical Context

The RFPIC12F675H-I/SS integrates a PICmicro® Mid-Range CPU core with an on-die UHF transmitter subsystem. Its RF section uses a crystal oscillator multiplied by 32 to generate carrier frequency, with phase-locked VCO and integrated power amplifier delivering +10 dBm to –12 dBm output in four discrete steps. The REFCLK output is divided by 8 (specific to H-band variant), supporting narrowband receiver synchronization.

Peripheral integration includes Timer1 with gate control and LP oscillator support for wake-up timing, 10-bit ADC with selectable voltage reference, and interrupt-on-change capability across all six GPIOs. Memory architecture supports in-circuit serial programming (ICSP™) via GP0/GP1, with 100,000 FLASH write endurance and >40-year data retention.

Key Specifications

Pinout & Package

Package: 20-pin SSOP (Small Outline Package), 0.65 mm pitch, body width 5.3 mm - compatible with standard surface-mount reflow processes and space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF microcontroller applications.

Compared with rfPIC12F675F-I/SS and rfPIC12F675K-I/SS, the RFPIC12F675H-I/SS provides H-band RF performance (850–930 MHz) with ÷8 REFCLK - making it the sole option for 868/915 MHz deployments requiring narrowband receiver synchronization and FCC/EN compliance in that band.

Availability

RFPIC12F675H-I/SS is available at Aetrix Electronics and suitable for automotive RKE, TPMS, garage door openers, and wireless building access systems requiring stable component supply and long-lifecycle support.

Supply support for RFPIC12F675H-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, with global design and manufacturing operations.

The rfPIC12F675 product line was designed to integrate RF transmission capability directly into cost-sensitive, battery-operated embedded endpoints - targeting remote controls, sensors, and security peripherals where minimal external components and regulatory-certified RF performance are critical.

FAQ

What is the RF frequency range supported by the RFPIC12F675H-I/SS?

The RFPIC12F675H-I/SS operates in the 850–930 MHz band, specifically targeting the 868 MHz (EU) and 915 MHz (North America) ISM bands. Its RF section uses a crystal oscillator multiplied by 32, so a 27 MHz crystal yields 864 MHz output. This band assignment is fixed per variant and cannot be reconfigured in firmware. The RFPIC12F675H-I/SS must be paired with a crystal and matching network optimized for this range.

Does the RFPIC12F675H-I/SS support both ASK and FSK modulation?

Yes, the RFPIC12F675H-I/SS supports both ASK and FSK modulation through dedicated DATAASK and DATAFSK input pins. ASK modulation is applied directly to the RF power amplifier, while FSK is implemented by crystal pulling via the FSKOUT pin, which modulates the reference crystal's load capacitance. Both schemes operate up to 40 Kbps and comply with FCC Part 15.231 and EN 300 220 regulations when configured per Microchip's reference designs.

What is the purpose of the REFCLK pin on the RFPIC12F675H-I/SS?

The REFCLK pin on the RFPIC12F675H-I/SS outputs a divided version of the RF crystal oscillator - specifically divided by 8 for the H-band variant. This signal provides a stable, low-jitter reference for synchronizing external narrowband receivers, enabling improved interference immunity and extended communication range. Unlike the K/F variants (which output ÷4), the ÷8 division is hardwired and unique to the RFPIC12F675H-I/SS.

How many analog input channels does the RFPIC12F675H-I/SS ADC support?

The RFPIC12F675H-I/SS includes a 10-bit analog-to-digital converter with 4 configurable input channels (AN0–AN3), mapped to GP0, GP1, GP2, and GP4 respectively. Each channel supports software-selectable voltage reference (VDD, VSS, or internal 2.048 V), and conversion results are stored in ADRESH/ADRESL registers. The ADC is fully integrated - no external sample-and-hold or reference ICs are required.

Can the RFPIC12F675H-I/SS be programmed in-circuit after PCB assembly?

Yes, the RFPIC12F675H-I/SS supports In-Circuit Serial Programming (ICSP™) using GP0 (ICSPDAT) and GP1 (ICSPCLK) pins. This allows full firmware loading, verification, and calibration data programming after solder-down, eliminating the need for socketed programming. A standard 5-pin ICSP header (VDD, VSS, PGD, PGC, MCLR) is sufficient, and the process is compatible with Microchip's MPLAB® ICD and PICkit™ programmers.