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PDF STFPC311 Data sheet ( Hoja de datos )
| Número de pieza | STFPC311 | |
| Descripción | Front panel controller/driver | |
| Fabricantes | STMicroelectronics | |
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STFPC311
Front panel controller/driver
with standby power management
Features
■ 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
www.DataSheet4(PUh.icliopms 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
Order Codes
PQFP-52
Description
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 see Figure 6 on page 12.
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).
Features
■ DVD players
■ VCD players
■ AV equipment like Home Stereo
■ POS Systems
Part number
STFPC311
Temperature range
-40 to 85°C
Package
PQFP-52
May 2006
Rev 1
1/39
www.st.com
39
1 page  
STFPC311
2 Pin connection
Figure 2. Connection diagram (top view PQFP-52)
2 Pin connection
www.DataSheet4U.com
STFPC311
Note: For a description of the behavior of each pin, refer to the Table 1: Pin description on page 6.
5/39
5 Page 
STFPC311
3 Initialization
3.6.3
Watchdog timer operation during standby
● When a hot-key signal is detected either from the front panel or remote control during
standby, the STBY de-asserts.
● The de-assertion of the STBY triggers the watchdog timer.
● The timer value is the programmed value that is set by the user (1s-15s). If the user did not
change the value before entering standby, then it remains 10s.
● Also note: that The watchdog timer is off when the STFPC311 is in the standby mode to
save power.
Figure 5. Standby condition
3 a ) S ta n d b y C o n d itio n (N o rm a l b e h a vio r )
www.DataSheet4U.com
Hot key command from IR
or Key pad for wake up
W DG timer triggers
STBY
READY
MUTE
R E A D Y a sse rts w ith in p ro g ra m m e d tim e r va lu e (1 s-1 5 s)
3b ) S ta n d b y C o n d itio n ( A b n o rm a l b e h a vio r, p ro c e s s o r is n o t re s p o n d in g)
H ot key com m and from IR W DG timer
or Key pad for wake up
triggers
Signals STBY after
W DG count is over
STBY
READY
MUTE
READY continues to remain low
The watchdog timer is triggered by a de-assertion of the STBY signal or by the internal
Power-on Reset signal. It is not affected by the STB pin.
11/39
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet STFPC311.PDF ] | |
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