STFPC311 查看數據表（PDF） - STMicroelectronics
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STFPC311 Datasheet PDF : 39 Pages
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1 Functional description
1 Functional description
STFPC311
The STFPC311 receives serial data from the microcontroller through the SPI interface, latches
the data, and then masks the inputs from the MCU. This data consists of commands followed
by data. There are 4 types of commands:
● configuration,
● data,
● address, and
● display.
The STFPC311 integrates the supply standby power management functionality, remote control
decoder, and a 28-bit VFD driver. Microcontrollers usually run the first two tasks.
This device reduces the stand-by power consumption of the whole Front Panel application as
well as the hardware by integrating the infrared (IR) remote control decoder.
A dedicated supply voltage powers the STFPC311 directly from the main supply board. When
power is plugged in, control of the power supply management is done using the following pins:
1. STBY,
2. IR_DATA_IN, and
3. READY.
1.1 Block diagram
Figure 1. Block diagram
IR_DATA_IN
READY/STBY_n
Remote Control
Decoder & Stand
By Function
STBY
MUTE
Watchdog
Timer
DIN
DOUT
CLK
STB
VDD
ROSC
SW1
SW2
KEY1
KEY2
SPI
Serial
I/F
OSC
2-bit
Latch
2
4/39
Command Decoder
Display Memory
(20 x 16)
Timing Generator
Key Scan and
Dimming Circuit
Key Data Memory
(2 x 12)
20-bit
Output
Latch
20
12
8
8
Data
Selector
16-bit
Shift
Register
8
16
8
LED1
2
4-bit
LED2
Latch
LED3
LED4 VDD GND VSS
(+3.3V) (0V) (-30V)
SEG1/KS1
SEG12/KS2
SEG13/GRID16
SEG20/GRID9
GRID8
GRID1
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