ST公司的STFPC311是控制和驱动前面板的真空荧光显示屏(VFD)的低成本完整的综合解决方案. STFPC311集成了VFD控制器,以及有内置的遥控译码器模块,非常适合在待机状态下把应用待机电流降低到最低限度而降低功耗. STFPC311通过STB的微控制器的SPI接口进行输入串行数据,可广泛应用于DVD播放器,VCD播放器,像家庭立体声的AV设备以及POS系统.本文介绍了STFPC311的主要性能,方框图和典型应用电路图以及STFPC311-LED评估板的主要性能和详细电路图.
ST STB/DVD front panel with LED based on STFPC311
ST STB/DVD前面板外形图.
STFPC311 Front panel controller/driver with standby power management
The STFPC311 is a complete, low-cost, integrated solution for controlling and driving a
front panel Vacuum Fluorescent Display (VFD). It is ideal for decreasing power consumption in
standby mode by reducing the application standby current to a minimum. It also contains a built-in remote control decoder module.
While in the standby mode of operation, a valid key press or signal from infrared decoder will start a proper power-up.
The STFPC311 integrates a VFD controller with a driver that is run on a 1/8 to 1/16-duty factor. It consists of 12 segments output lines, 8 grid output lines, 8 shared segments/grid output drive lines, a display memory, a control circuit, and a key scan circuit. Serial data is input to the STFPC311 through the SPI Interface of a microcontroller (STB, DIN, DOUT, and CLK).
Additionally, this IC can support 2 general purpose input switches (SW1 and SW2).
应用:
■ DVD players
■ VCD players
■ AV equipment like Home Stereo
■ POS Systems
主要特性:
■ IC front panel controller/driver
■ Timing power standby management controller
■ IC power supply from 3.3V (VDD) to –30V (VSS)
■ Integrated VFD driver and controller
■ Infrared (IR) Remote Control (RC) Decoder (Philips or NEC format)
■ Drives many display modes (12 segments/16 digits to 20 segments/8 digits)
■ High voltage outputs (VDD - 33.3V max)
■ No external resistors necessary for driver outputs (P-channel open- drain with pull-down
resistor outputs)
■ Key scanning (up to 12mm x 2mm matrix)
■ Led ports (4 channels, 20mA, max)
■ Serial interface (STB, CLK, DIN, and DOUT) communication protocol
■ Dimming circuit (adjustable up to 8 steps)
■ Supports auto-increment of display digit, which lightens the load on the MCU
■ Programmable 8 hot keys for the IR remote control command
■ Programmable 8 hot keys for key scan command
■ Low power consumption in standby mode
■ 2 general purpose input ports (SW1, SW2)
■ Available in PQFP-52 package
图1. STFPC311方框图.
图2. STFPC311典型应用电路图.
注:STFPC311典型应用电路图的元件数值:
ROSC = 33k?1% for oscillator resistor;
R1 ~ R4 = 0.75 ~ 1.2k;
R5, R6 = 10kfor external keyboard pull-down resistor;
C1 = 33μF-25V electrolytic;
C2 = 0.01 ~ 0.1μF-25V ceramic;
C3 = 0.01 ~ 0.1μF-63V ceramic;
C4 = 33μF-63V electrolytic;
D1 ~ D12 = 1N4148;
Ef = filament voltage according with the VFD specs;
VDD = 3.3V ?0%;
VSS = down to VDD – 33.3V.
详情请见数据表:
http://www.st.com/stonline/products/literature/ds/12324/stfpc311.pdf
STFPC311-LED评估板:
The STFPC311-LED is an evaluation board designed for a quick and easy evaluation of the
STFPC311 vacuum fluorescent display controller used to drive LED (light emitting diode) displays.
The STFPC311 VFD driver and controller allows communication with the MCU through a 4-wire serial interface. It is also ideal for reducing power consumption when in standby mode. Several functions are integrated, including watchdog timers and remote control decoding protocols such as Philips RC-5 and NEC. It also provides a muting capability to mute the audio before entering standby power-saving mode.
主要特性:
■ 17-segment, 11-digit vacuum fluorescent display
■ 15-programmable front panel keys
■ 2 switches, 4 LEDs
■ 2 LEDs to display standby and mute status
■ 1 infrared connector for remote control
■ Parallel port for communication with PC
图3. STFPC311-LED评估板电路图.