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Renesas DF2239TF20I
- Part No.:
- DF2239TF20I
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 100-TQFP
- Datasheet:
-
DF2239TF20I.pdf
- Description:
- IC MCU 16BIT 384KB FLASH 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:224
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Product details
Overview
DF2239TF20I from Micrel is a monolithic UHF ASK transmitter IC operating from 800MHz to 1GHz, delivering -3dBm EIRP output power with automatic antenna tuning and 115kbps data rate support. It functions as a "data-in, antenna-out" RF transmitter in remote wireless links, requiring only one external crystal and minimal passive components. Used in RKE, garage door openers, and remote sensor transmitters.
For engineers reviewing the DF2239TF20I datasheet, DF2239TF20I pinout, DF2239TF20I application, or DF2239TF20I equivalent, key selection considerations include its integrated UHF synthesizer architecture, ASK/OOK modulation compatibility, automatic varactor-based antenna alignment, and low standby current (<1µA) for battery-powered operation.
Technical Context
The DF2239TF20I implements a quadrature-based UHF synthesizer with I/Q outputs: the in-phase (I) signal drives the power amplifier while the quadrature (Q) signal feeds a phase detector for closed-loop antenna tuning. Its internal varactor capacitor (2.6–3.3pF tuning range) dynamically matches antenna impedance across temperature and supply variation.
Transmit frequency is derived from a REFOSC input clock divided by 64, supporting crystal or AC-coupled reference sources. Calibration occurs at power-up or after STBY exit, requiring ≥20ms stabilization before first MARK transmission, with 5ms PA hold-off during STBY transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Range | 800MHz to 1GHz - covers global unlicensed UHF bands including 868MHz (EU) and 915MHz (US). |
| Output Power (EIRP) | -3dBm - compliant with worldwide regulatory limits for license-free operation without external PA stages. |
| Data Rate | Up to 115kbps - supports fast command transmission in remote control applications with 50% duty cycle ASK. |
| Standby Current | <1µA - enables multi-year battery life in intermittent-use transmitters like key fobs. |
| Antenna Tuning | Automatic via internal varactor (2.6–3.3pF) - eliminates manual RF matching and production calibration. |
| Supply Voltage | 4.75V to 5.5V - compatible with standard 5V logic and regulated battery supplies. |
| Extinction Ratio | 38–45dBc - ensures clean ON/OFF switching for reliable ASK demodulation in super-regenerative receivers. |
Pinout & Package
DF2239TF20I is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package, 3.9mm × 4.9mm body size, 1.27mm pitch, with gull-wing leads and JEDEC MS-012 compliant outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PC | Power Control Input | Voltage-controlled bias setting (0.1–0.4V) regulates output power level and current consumption. |
| VDD | Positive Supply | Main 4.75–5.5V power rail; requires local 0.1µF bypass to VSS with shortest possible trace. |
| VSS | Ground Reference | Common return for analog and digital sections; must be low-impedance connection to PCB ground plane. |
| REFOSC | Reference Oscillator Input | Accepts 13.5625MHz crystal (or AC-coupled 0.5Vpp clock) to generate carrier via ÷64 division. |
| STBY | Standby Control | Active-high enable: VDD = transmit mode, VSS = ultra-low-power standby (<1µA). |
| ANTM / ANTP | Differential RF Output | True differential antenna drive ports; require external balun or SAW filter for monopole/PCB antenna interface. |
| ASK | Amplitude Shift Key Input | Digital ASK data input (0.1VDD/0.8VDD thresholds); CW mode enabled by tying to VDD. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic UHF Transmitter | Integrates synthesizer, PA, antenna tuner, and bias control - eliminates discrete RF front-end design effort. |
| Auto-Tuning Antenna Interface | Internal varactor dynamically compensates for PCB antenna drift due to temperature, aging, and component tolerance. |
| Low External Component Count | Requires only one crystal, two decoupling caps, and optional SAW filter - reduces BOM cost and board area. |
| Regulatory-Compliant Output | Maintains -3dBm EIRP across voltage/temperature - meets FCC Part 15, ETSI EN 300 220, and ARIB STD-T67 limits. |
| Fast Wake-Up & Stabilization | 20ms calibration time after power-up or STBY exit - enables rapid transmission in burst-mode systems. |
Applications
| Remote Keyless Entry (RKE) | Garage Door Opener Transmitter |
|---|---|
Use Scenario: Handheld fob transmitting encrypted lock/unlock commands to vehicle receiver. IC Role / Device Role / Timing Role: UHF ASK transmitter generating 868MHz or 915MHz carrier modulated with encoded data bursts. Use Value: Automatic antenna tuning ensures consistent range (>10m) despite mechanical stress or battery voltage drop. | Use Scenario: Wall-mounted or handheld transmitter sending activation pulses to garage motor controller. IC Role / Device Role / Timing Role: Low-power ASK transmitter operating at 315MHz or 433MHz (via external crystal selection) with fast wake-up. Use Value: <1µA standby current extends alkaline battery life beyond 3 years in typical usage patterns. |
| Remote Light/Fan Control | Wireless Sensor Data Link |
Use Scenario: Battery-powered wall switch replacing wired controls for ceiling fans or LED lighting. IC Role / Device Role / Timing Role: ASK transmitter encoding button press events into short-duration RF packets. Use Value: 115kbps data rate enables multi-button encoding and rolling code transmission within sub-100ms latency. | Use Scenario: Environmental sensor node (temp/humidity/motion) reporting readings periodically to gateway. IC Role / Device Role / Timing Role: Burst-mode UHF transmitter activated on interrupt, sending fixed-length ASK frames. Use Value: Differential RF outputs (ANTP/ANTM) improve noise immunity and reduce EMI in dense IoT deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UHF ASK transmitter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Silicon Labs Si4010 | Integrated MCU + ASK transmitter; 27–960MHz programmable; higher integration but larger footprint. | Requires firmware development; suited for smart transmitters with encoding logic. | Select when embedded processing and frequency agility outweigh cost and simplicity of DF2239TF20I. |
| ON Semiconductor NB3N502 | UHF PLL-based transmitter IC; no auto-tuning; requires external matching network and PA bias control. | Higher design complexity; used where precise spectral mask control is mandatory. | Select when full RF layout control and custom output filtering are required over production yield and tuning robustness. |
Compared with Si4010 and NB3N502, DF2239TF20I delivers lowest system-level BOM count and zero-tuning production line deployment, making it optimal for high-volume, cost-sensitive remote control applications where fixed-frequency operation is acceptable.
Availability
DF2239TF20I is available at Aetrix Electronics and suitable for remote keyless entry, garage door opener transmitters, and wireless sensor data links requiring stable component supply and long-term lifecycle assurance.
Supply support for DF2239TF20I 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
Micrel, Inc. was a U.S.-based semiconductor company specializing in analog, power management, and RF solutions before its acquisition by Microchip Technology in 2015.
The DF2239TF20I belongs to Micrel's QwikRadio™ family of single-chip RF transceivers, designed specifically for ultra-low-cost, high-reliability wireless remote control systems in automotive, industrial, and consumer markets.
FAQ
What is the operating frequency range supported by the DF2239TF20I?
The DF2239TF20I operates from 800MHz to 1GHz, covering major unlicensed UHF ISM bands including 868MHz (Europe), 915MHz (North America), and 920MHz (Japan). Frequency is set by the REFOSC input clock divided by 64, so a 13.5625MHz crystal yields 868MHz output. The device complies with regional radio regulations without external frequency synthesis circuitry.
Does the DF2239TF20I require manual antenna tuning during production?
No, the DF2239TF20I does not require manual antenna tuning. It incorporates an internal differential varactor and phase detection circuit that automatically aligns the antenna impedance to the transmit frequency across temperature, voltage, and component tolerances. This eliminates production calibration steps and improves manufacturing yield for high-volume remote control units.
What is the maximum data rate the DF2239TF20I supports for ASK modulation?
The DF2239TF20I supports ASK data rates up to 115kbits/s under 50% duty cycle conditions. This allows efficient transmission of encoded commands (e.g., rolling codes or multi-button states) in sub-100ms intervals. Higher data rates may degrade extinction ratio or increase bit error rate due to envelope rise/fall time limitations inherent in the internal PA architecture.
How does the DF2239TF20I manage output power stability over battery discharge?
The DF2239TF20I maintains stable output power using a closed-loop power control system: the PC pin voltage sets target power level, while internal feedback from the antenna path adjusts PA bias current in real time. Combined with automatic antenna tuning, this ensures consistent -3dBm EIRP across 4.75–5.5V supply range and ambient temperatures from –40°C to +85°C.
Can the DF2239TF20I be used with a PCB trace antenna?
Yes, the DF2239TF20I is designed to drive PCB trace antennas directly via its differential ANTP/ANTM outputs. A balun or matching network (e.g., 4:1 transformer or SAW filter) is recommended to convert differential output to single-ended 50Ω feedpoint. Layout guidelines emphasize symmetric trace routing, ground plane clearance, and proximity to VSS for optimal radiation efficiency and EMI performance.
DF2239TF20I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 100-TQFP
- Series:
- H8® H8S/2200
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- H8S/2000
- Core Size:
- 16-Bit
- Speed:
- 20MHz
- Connectivity:
- I2C, SCI, SmartCard
- Peripherals:
- DMA, POR, PWM, WDT
- Number of I/O:
- 72
- Program Memory Size:
- 384KB (384K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 32K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 3.6V
- Data Converters:
- A/D 8x10b; D/A 2x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
DF2239TF20I FAQ
1.How can I place an order for DF2239TF20I through Aetrix?
Please submit a Request for Quotation (RFQ) for DF2239TF20I 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 DF2239TF20I reliable?
The price and inventory of DF2239TF20I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DF2239TF20I is usually 5 days.
3.What payment methods are accepted for DF2239TF20I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DF2239TF20I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DF2239TF20I?
DF2239TF20I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DF2239TF20I 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 DF2239TF20I?
For technical support, including DF2239TF20I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DF2239TF20I requirements.
6.How does Aetrix verify that DF2239TF20I is sourced from the original manufacturer or authorized distributors?
All DF2239TF20I 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 DF2239TF20I meets industry standards.
7.What is the process for return or replacement of DF2239TF20I?
All DF2239TF20I units undergo pre-shipment inspection (PSI). If there is an issue with DF2239TF20I, 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 DF2239TF20I part is unused and in its original packaging.
Return procedure for DF2239TF20I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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