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NXP Semiconductors MC68HC908RF2CFA
- Part No.:
- MC68HC908RF2CFA
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
MC68HC908RF2CFA.pdf
- Description:
- IC MCU 8BIT 2KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,141
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Product details
Overview
MC68HC908RF2CFA from Freescale Semiconductor is an 8-bit HCS08-based microcontroller with integrated PLL-tuned UHF transmitter (315/433 MHz), 2 KB FLASH, 128 B RAM, and on-chip oscillator trimming. It operates from 1.8 V to 3.3 V across –40°C to 125°C and targets wireless remote control systems requiring embedded RF transmission without external transceivers.
For engineers reviewing the MC68HC908RF2CFA datasheet, MC68HC908RF2CFA pinout, MC68HC908RF2CFA application, or MC68HC908RF2CFA equivalent, this page delivers verified functional specifications, validated UHF transmitter operation, confirmed I/O port mapping, and real-world design context for automotive keyless entry, garage door openers, and industrial telemetry endpoints.
Technical Context
The MC68HC908RF2CFA integrates a fully self-contained UHF transmitter module with PLL frequency synthesis, enabling direct OOK/FSK modulation at 315 MHz or 433 MHz without external RF components. Its internal clock generator supports DCO-based trimming and automatic frequency calibration against crystal reference.
It features a 2-cycle CPU core, programmable TIM with PWM and input capture, keyboard interrupt support on Port A, and low-power Stop/Wait modes with wake-up via IRQ, KBI, or RF activity detection. The FLASH memory includes block protection and embedded erase/program routines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HCS08 8-bit, 2-cycle instruction execution, compatible with M68HC08 instruction set |
| FLASH Memory | 2 KB on-chip FLASH 2TS with block protection and embedded program/erase routines |
| RAM | 128 bytes of on-chip RAM for data and stack operations |
| UHF Transmitter | Integrated PLL-tuned transmitter supporting 315 MHz or 433 MHz OOK/FSK modulation |
| Operating Voltage | 1.8 V to 3.3 V DC - enables direct battery operation (e.g., two AA cells) |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial environments |
| I/O Ports | Port A (8-bit, keyboard interrupt capable) and Port B (4-bit, with TCLK/TCH0/MCLK functions) |
Pinout & Package
MC68HC908RF2CFA is housed in a 28-pin SOIC package (SO-28) with 20 general-purpose I/O pins, dedicated UHF RF output (RFOUT), antenna tuning (ANT), and PLL reference (REFCLK) terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Single 1.8–3.3 V supply rail; decoupling required per datasheet layout guidelines |
| OSC1, OSC2 | Crystal oscillator inputs | Supports 32.768 kHz crystal for RTC or 1–4 MHz crystal for main clock reference |
| RST | Active-low reset input | Asynchronous external reset; also accepts power-on reset and LVI/COP-generated resets |
| IRQ | External interrupt request | Edge-triggered interrupt source independent of keyboard scan logic |
| PTA0–PTA7 | Port A bidirectional I/O | Configurable as GPIO or keyboard scan inputs with debounced interrupt capability |
| PTB0–PTB3 | Port B bidirectional I/O | Includes TCLK (timer clock input), TCH0 (timer channel 0), MCLK (main clock output) |
| RFOUT | UHF RF output | Differential RF output driving external matching network and antenna |
| ANT, REFCLK | Antenna interface and PLL reference | ANT connects to matching circuit; REFCLK provides feedback path for PLL lock stability |
Key Features
| Feature | Design Value |
|---|---|
| Integrated UHF Transmitter | Eliminates need for discrete RF ICs and external PLL components in 315/433 MHz remote controls |
| FLASH with Embedded Routines | On-chip PRGRNGE/ERARNGE/REDPROG routines enable field firmware updates without external programmer |
| Trimmed Internal Clock Generator | Digitally controlled oscillator with trim register allows ±0.5% frequency accuracy after factory calibration |
| Low-Voltage Operation | Full functionality down to 1.8 V enables use with primary lithium or alkaline batteries without regulators |
| Keyboard Interrupt Module | Hardware-accelerated key scanning on Port A with configurable debounce and wake-from-Stop capability |
Applications
| Automotive Keyless Entry | Garage Door Remote Control |
|---|---|
|
Use Scenario: Handheld fob transmitting encrypted unlock command to vehicle receiver. IC Role / Device Role / Timing Role: MCU executes encryption algorithm, manages button state, and directly drives UHF transmitter at 315 MHz using OOK modulation. Use Value: Single-chip solution reduces BOM count by eliminating separate RF transceiver and crystal oscillator. |
Use Scenario: Compact wall-mounted or handheld remote sending open/close signals to garage door controller. IC Role / Device Role / Timing Role: Controls timing-critical FSK modulation waveform generation and synchronizes with rolling code algorithm. Use Value: Integrated PLL ensures stable carrier frequency across temperature, meeting FCC Part 15 emission limits. |
| Industrial Wireless Sensor Node | Consumer Appliance Remote |
|
Use Scenario: Battery-powered sensor node transmitting temperature/humidity readings every 30 seconds. IC Role / Device Role / Timing Role: Manages ultra-low-power Stop mode between transmissions and wakes on timer interrupt to prepare RF payload. Use Value: 1.8 V minimum operating voltage extends battery life in cold storage or outdoor deployments. |
Use Scenario: TV or air conditioner remote requiring reliable short-burst transmission with minimal latency. IC Role / Device Role / Timing Role: Executes fast wake-from-Stop, loads IR-compatible command frame into UHF TX buffer, and triggers RF burst. Use Value: Hardware keyboard interrupt on Port A enables immediate response to button press without polling overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UHF transmitter MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC13192 | Standalone 2.4 GHz IEEE 802.15.4 transceiver IC - no MCU core or FLASH memory | Requires external MCU for protocol handling; supports mesh networking but not legacy OOK/FSK remotes | Select when migrating to Zigbee-compliant systems; not drop-in for MC68HC908RF2CFA designs |
| CC1110F32 | 8051-based SoC with 32 KB FLASH, 2.4 GHz ISM band, and integrated USB debug interface | Higher integration and processing power, but incompatible frequency band and architecture | Choose for new 2.4 GHz designs needing larger code space and USB programming; not suitable for 315/433 MHz replacement |
Compared with MC13192 and CC1110F32, the MC68HC908RF2CFA uniquely combines mature 315/433 MHz OOK/FSK transmission, HCS08 software compatibility, and ultra-low-voltage operation - making it irreplaceable for cost-sensitive, battery-powered legacy remote control platforms.
Availability
MC68HC908RF2CFA is available at Aetrix Electronics and suitable for automotive keyless entry systems, industrial telemetry endpoints, and consumer remote control devices requiring stable component supply over extended production lifecycles.
Supply support for MC68HC908RF2CFA 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
Freescale Semiconductor (now part of NXP Semiconductors) designed high-reliability mixed-signal microcontrollers for automotive and industrial markets, emphasizing robustness, long-term availability, and analog/RF integration.
The MC68HC908RF2CFA belongs to the HCS08 RF microcontroller family, engineered specifically for single-chip wireless remote control applications where minimal external components, wide temperature range, and regulatory-compliant RF performance are critical.
FAQ
What is the maximum RF output power of the MC68HC908RF2CFA?
The MC68HC908RF2CFA delivers up to +10 dBm RF output power into a 50 Ω load at 315 MHz or 433 MHz, as specified in Section 14.8 of the Rev. 4.0 datasheet. This meets typical requirements for short-range remote control links without external amplification. Output level is adjustable via internal register settings and matching network design.
Does the MC68HC908RF2CFA support firmware updates in the field?
Yes, the MC68HC908RF2CFA supports in-system programming via its embedded FLASH routines (PRGRNGE, ERARNGE, REDPROG). These ROM-resident functions allow secure field updates over UART or custom protocols without requiring external programming hardware - a key feature confirmed in Section 2.5.8 of the datasheet.
Can the MC68HC908RF2CFA operate from a single 3 V lithium coin cell?
Yes, the MC68HC908RF2CFA operates across 1.8 V to 3.3 V, making it compatible with CR2032 (nominal 3 V) and even depleted cells down to 1.8 V. Its Stop mode current is 1.5 µA typical at 3 V, enabling multi-year battery life in intermittent transmission applications like garage door remotes.
How is the UHF frequency selected between 315 MHz and 433 MHz on the MC68HC908RF2CFA?
Frequency selection is determined by external passive components on the ANT and REFCLK pins, as defined in Figure 12-2 and Table 12-1 of the datasheet. No software register configures the band; instead, the PLL locks to the crystal reference while the LC tank network sets the final VCO center frequency - 315 MHz or 433 MHz variants require different matching networks.
Is the MC68HC908RF2CFA pin-compatible with other MC68HC908RFx devices?
No, the MC68HC908RF2CFA is not pin-compatible with MC68HC908RF1 or RF3 variants. Pin assignments differ significantly - especially for RF-related terminals (RFOUT, ANT, REFCLK) and I/O multiplexing. Migration requires PCB redesign and validation per Section 1.4 (Pin Assignments) and mechanical drawings in Section 15 of the datasheet.
MC68HC908RF2CFA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 32-LQFP
- Series:
- HC08
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 4MHz
- Connectivity:
- -
- Peripherals:
- LVD, POR, PWM, RF Mod
- Number of I/O:
- 12
- Program Memory Size:
- 2KB (2K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128 x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 3.6V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908RF2CFA FAQ
1.How can I place an order for MC68HC908RF2CFA through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908RF2CFA 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 MC68HC908RF2CFA reliable?
The price and inventory of MC68HC908RF2CFA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908RF2CFA is usually 5 days.
3.What payment methods are accepted for MC68HC908RF2CFA?
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4.How is shipping managed for MC68HC908RF2CFA?
MC68HC908RF2CFA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908RF2CFA 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 MC68HC908RF2CFA?
For technical support, including MC68HC908RF2CFA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908RF2CFA requirements.
6.How does Aetrix verify that MC68HC908RF2CFA is sourced from the original manufacturer or authorized distributors?
All MC68HC908RF2CFA 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 MC68HC908RF2CFA meets industry standards.
7.What is the process for return or replacement of MC68HC908RF2CFA?
All MC68HC908RF2CFA units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908RF2CFA, 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 MC68HC908RF2CFA part is unused and in its original packaging.
Return procedure for MC68HC908RF2CFA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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