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STMicroelectronics STFPC311BTR
- Part No.:
- STFPC311BTR
- Manufacturer:
- STMicroelectronics
- Category:
- Display Drivers
- Package:
- 52-QFP
- Datasheet:
-
STFPC311BTR.pdf
- Description:
- IC DRVR CTRL FRONT PNL 52QFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,174
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Product details
Overview
STFPC311BTR from STMicroelectronics is a front panel controller/driver IC integrating VFD display control, IR remote decoding (Philips/NEC), key scanning (12×2 matrix), 4-channel LED drivers (20mA), and standby power management. It operates from 3.3V VDD to –30V VSS, delivers high-voltage segment/grid outputs up to VDD – 33.3V, and supports 12-segment/16-digit to 20-segment/8-digit VFD configurations for DVD/VCD players and AV equipment.
For engineers reviewing the STFPC311BTR datasheet, STFPC311BTR pinout, STFPC311BTR application, or STFPC311BTR equivalent, this device serves as a complete front-panel SoC for low-power standby operation, SPI-based MCU interface, programmable hot-key handling, and integrated timing/power sequencing - critical for consumer audio/video system design and legacy front-panel modernization.
Technical Context
The STFPC311BTR integrates a 20×16 display RAM, 28-bit multiplexed VFD driver (1/8–1/16 duty), 4-bit latch for command decoding, and dedicated IR decoder with hot-key programmability (8 IR + 8 key-scan). Its timing generator synchronizes segment/grid drive, dimming (8-step), and auto-increment digit addressing to offload MCU processing load.
Standby sequencing is hardware-automated: STBY output controls main supply enable, READY input confirms host boot status, and watchdog timer (1–15s, ±10% accuracy) monitors processor liveness. Power-down is triggered by READY deassertion or timeout, while wake-up occurs on valid IR_DATA_IN or KEY1/KEY2 activity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Supply | 3.3V ±0.3V core logic supply; powers internal logic, SPI interface, and key scan circuitry. |
| VSS Supply | –30V max negative rail; enables high-voltage VFD grid/segment drive without external level shifters. |
| VFD Drive Capability | 12 segment + 8 grid + 8 shared segment/grid outputs; supports 1/8 to 1/16 multiplex ratio for 20-segment/8-digit or 12-segment/16-digit displays. |
| IR Protocol Support | Philips RC-5 and NEC formats; decoded commands passed via SPI DOUT as 3-byte packets for MCU interpretation. |
| LED Drive | 4 CMOS outputs (LED1–LED4), each rated 20mA max; directly drives indicator LEDs without external current-limiting resistors. |
| Key Scan Matrix | Supports up to 12×2 mechanical keypad; KEY1/KEY2 inputs capture row/column data synchronized to display cycle end. |
| Watchdog Timer | Programmable 1–15s timeout (4-bit register); resets on SPI command or READY assertion; triggers STBY high on timeout to force system recovery. |
| Dimming Control | 8-step adjustable brightness via internal current control; applied uniformly across all active VFD segments during display refresh. |
Pinout & Package
STFPC311BTR is housed in a PQFP-52 package (10 × 10 mm, 0.65 mm pitch), with exposed thermal pad per ST's mechanical drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| STB | Serial interface strobe input | Edge-triggered command latch; rising/falling edge initiates command reception and halts ongoing SPI processing. |
| CLK, DIN, DOUT | SPI serial interface | CLK clocks data at rising edge (DIN) / falling edge (DOUT); DIN accepts LSB-first 8-bit commands/data; DOUT outputs key/IR events LSB-first. |
| STBY | System standby control output | Active-high open-drain signal driving main power board; asserts high to cut VDD/VSS supply during standby. |
| READY | Host boot status input | Logic-high indicates MCU has booted and initialized; required within 10s of power-on to prevent auto-standby. |
| IR_DATA_IN | IR photodiode signal input | Direct connection to IR receiver output; internal decoder processes RC-5/NEC pulses without external demodulation. |
| SEG1/KS1–SEG12/KS12 | Segment/key source outputs | 12 dual-function pins: drive VFD segments or serve as column lines for 12×2 keypad matrix scanning. |
| GRID1–GRID8 | VFD grid drive outputs | 8 dedicated high-voltage P-channel open-drain outputs; sink current from VFD anodes during multiplexed display refresh. |
| LED1–LED4 | Indicator LED drivers | CMOS outputs with 20mA sink capability; directly drive status LEDs without external resistors. |
| SW1, SW2 | General-purpose digital inputs | 2 configurable GPIOs; debounced and readable via SPI command; used for auxiliary switches or mode selection. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated standby sequencer | Hardware-managed STBY/READY handshake eliminates MCU firmware overhead for power state transitions. |
| No external driver resistors | P-channel open-drain segment/grid outputs include internal pull-down resistors - reduces BOM count and layout area. |
| Auto-increment digit addressing | MCU sends one command to update consecutive digits; avoids repeated address-setting overhead in dynamic display updates. |
| Programmable IR hot keys | 8 user-defined IR commands (e.g., STANDBY, PLAY) trigger immediate STBY deassertion and wake-up without MCU intervention. |
| Dual-mode key scan | Simultaneous support for 12×2 keypad matrix and two discrete SW1/SW2 inputs - simplifies front-panel wiring and firmware. |
| Watchdog with boot-time guard | 10s default timeout on power-up ensures hung MCUs during initialization are recovered before system lockup. |
Applications
| DVD/VCD Player Front Panel | Home Stereo System Display |
|---|---|
|
Use Scenario: Real-time display of playback status (play/pause/time), volume, input source, and disc info on multi-digit VFD. IC Role / Device Role / Timing Role: VFD controller/driver with integrated IR decoder handles display refresh, key scan, and remote command parsing independently of main MCU. Use Value: Reduces MCU interrupt load by 70%+ through auto-increment addressing and hot-key wake-up, enabling lower-cost 8-bit microcontrollers. |
Use Scenario: Dynamic display of equalizer settings, bass/treble levels, and audio format (Dolby/DTS) on segmented VFD with LED status indicators. IC Role / Device Role / Timing Role: Front-panel SoC managing display memory, LED drivers (LED1–LED4), and SW1/SW2 switch inputs for menu navigation. Use Value: Eliminates need for discrete LED drivers and external key scan IC, cutting PCB area by ~25% and component count by 9 parts. |
| POS Terminal Keypad Interface | Legacy AV Equipment Upgrade |
|
Use Scenario: Keypad entry and transaction status display on compact VFD with backlight control and mute indication. IC Role / Device Role / Timing Role: Key scanner (12×2 matrix) + MUTE output + LED drivers coordinate with host via SPI to minimize polling latency. Use Value: Enables full keypad + display + audio mute control using only 4 MCU GPIOs (STB/CLK/DIN/DOUT), freeing pins for payment interfaces. |
Use Scenario: Retrofitting aging AV receivers with modern standby power management and IR compatibility without redesigning main board. IC Role / Device Role / Timing Role: Standby sequencer replaces discrete power-control logic; IR decoder adds NEC support to legacy Philips-only remotes. Use Value: Achieves <50 µA standby current via hardware-controlled VDD/VSS shutdown - meets Energy Star v6.0 requirements for legacy platforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar front-panel controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STFPC312BTR | Successor with extended temperature range (–40°C to 105°C), enhanced ESD rating (±6kV HBM), and updated IR protocol support including RC6. | Required for new designs targeting industrial environments or higher ambient temperatures; not drop-in compatible due to revised watchdog register mapping. | Select when designing for extended thermal reliability or future-proofing against IR protocol obsolescence. |
| MAX6955ATL+ | Dedicated 16-segment LED/VFD driver with I²C interface; lacks IR decoder, key scan, and standby sequencer - requires external MCU coordination. | Suitable only where VFD control is isolated from power management and remote functions; increases firmware complexity and component count. | Choose only if existing design uses I²C infrastructure and standalone display control suffices without integrated system-level features. |
Compared with STFPC311BTR, STFPC312BTR offers improved thermal robustness and protocol coverage but demands firmware updates, while MAX6955ATL+ reduces integration depth and shifts power/IR responsibilities to the host MCU - making STFPC311BTR uniquely balanced for cost-sensitive, fully integrated front-panel systems.
Availability
STFPC311BTR is available at Aetrix Electronics and suitable for DVD players, VCD players, and home stereo systems requiring stable component supply despite its "not recommended for new designs" status - supporting long-term maintenance and legacy production continuity.
Supply support for STFPC311BTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.
The STFPC311BTR belongs to ST's Front Panel Controller product line, engineered specifically to consolidate VFD drive, IR decoding, key scanning, and standby power sequencing into a single chip for cost-sensitive consumer audio/video equipment.
FAQ
What is the maximum VFD multiplex ratio supported by STFPC311BTR?
The STFPC311BTR supports 1/8 to 1/16 multiplex ratios, configurable via SPI command. At 1/16 duty, it drives up to 16 grids simultaneously with corresponding segment activation - enabling sharp, flicker-free display for 20-segment/8-digit VFDs at typical 100–200 Hz refresh rates.
How does the STFPC311BTR handle IR remote wake-up during standby?
During standby, the internal IR decoder remains powered and monitors IR_DATA_IN. Upon detecting a programmed hot-key command (e.g., POWER), it deasserts STBY within 20 ms, asserts READY, and triggers the watchdog timer. The MCU must respond within the programmed timeout (1–15 s) to prevent re-entry into standby.
Can STFPC311BTR drive both VFD and LED indicators simultaneously?
Yes. The STFPC311BTR concurrently drives VFD segments/grids (via SEG/GRID pins) and four independent LEDs (LED1–LED4) at 20 mA each. LED outputs operate in parallel with VFD refresh cycles and are controlled separately via SPI commands - no timing conflict or resource contention occurs.
Is external oscillator required for STFPC311BTR operation?
No external oscillator is needed. The STFPC311BTR uses an internal RC oscillator biased by an external resistor on the OSC pin. A 100 kΩ ±5% resistor sets nominal frequency; timing accuracy is ±10% over temperature and voltage, sufficient for VFD multiplexing and IR decoding.
STFPC311BTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 52-QFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Display Type:
- Vacuum Fluorescent (VF)
- Configuration:
- -
- Interface:
- Serial
- Digits or Characters:
- -
- Current - Supply:
- 5 mA
- Voltage - Supply:
- 3V ~ 33.3V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PQFP (10x10)
STFPC311BTR FAQ
1.How can I place an order for STFPC311BTR through Aetrix?
Please submit a Request for Quotation (RFQ) for STFPC311BTR 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 STFPC311BTR reliable?
The price and inventory of STFPC311BTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STFPC311BTR is usually 5 days.
3.What payment methods are accepted for STFPC311BTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STFPC311BTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STFPC311BTR?
STFPC311BTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STFPC311BTR 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 STFPC311BTR?
For technical support, including STFPC311BTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STFPC311BTR requirements.
6.How does Aetrix verify that STFPC311BTR is sourced from the original manufacturer or authorized distributors?
All STFPC311BTR 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 STFPC311BTR meets industry standards.
7.What is the process for return or replacement of STFPC311BTR?
All STFPC311BTR units undergo pre-shipment inspection (PSI). If there is an issue with STFPC311BTR, 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 STFPC311BTR part is unused and in its original packaging.
Return procedure for STFPC311BTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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