STFPC311BTR STMicroelectronics, STFPC311BTR Datasheet

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Features ■ IC front panel controller/driver ■ Timing power standby management controller ■ IC power supply from 3.3V (V ■ Integrated VFD driver and controller ■ Infrared (IR) Remote Control (RC) Decoder (Philips or NEC format) ■ Drives many display ...

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Contents 1 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

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STFPC311 8 Default status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

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Functional description 1 Functional description 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 ...

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STFPC311 2 Pin connection Figure 2. Connection diagram (top view PQFP-52) Note: For a description of the behavior of each pin, refer to the STFPC311 Table 1: Pin description on page 2 Pin connection 6. 5/39 ...

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Pin connection 2.1 Pin description Table 1. Pin description Pin Nº Symbol 1 OSC 2, 3 SW1, SW2 4 MUTE 5S TBY 7 GND POWER 8, 9 KEY1, KEY2 10 READY 1 IR_DATA_IN SEG1/KS1 SEG12/KS12 ...

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STFPC311 3 Initialization After the power is plugged in, the device will supply power to all of the components (including the host processor) by setting STBY to logic low in order to allow the host processor to program the STFPC311. ...

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Initialization 3.4 Standby or power-down mode Once the STFPC311 detects the status change of the READY to a logic low or after the preset waiting time (1s to 15s) has elapsed, the STFPC311 sets the STBY pin to a ...

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STFPC311 3.6.1 Watchdog timer operation during power-up Figure 3. Power-up condition Note: Watchdog timer is turned off by default upon READY assertion. If Watchdog kept on during READY high condition, the WDG registers must be set accordingly ...

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Initialization 3.6.2 Watchdog timer operation during power-down Figure 4. Power-down condition Note: The watchdog timer can be kept on during normal conditions when READY is high (depending on the user’s settings). In this condition, the watchdog timer can be ...

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STFPC311 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 ...

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Initialization 3.7 Flow charts Figure 6. Timing power standby sequencer flow chart * Programmable from 1 to 15s. † FPK = Front Panel Keys 12/39 STFPC311 ...

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STFPC311 Figure command and front panel key operation flowchart. 3 Initialization 13/39 ...

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Initialization Figure 8. Watchdog timer first power-up operation Figure 9. Watchdog timer operation 14/39 STFPC311 ...

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STFPC311 4 Display RAM address and display mode The display RAM stores the data transmitted from an external device to the STFPC311 through the serial interface and is assigned addresses, in units of 8-bits see Only the lower 4 bits ...

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Display RAM address and display mode The data of each key is stored READ by a read command, starting from the least significant bit. see Figure 11.. When the most significant bit of data (Seg next data (Seg b ...

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STFPC311 5 Data 5.1 LED Port Data is written to the LED port by a WRITE command, starting from the least significant bit of the port see Figure 12. when the bit is set the LED turns ...

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Commands 6 Commands A command sets the display mode and status of the VFD driver. The first 1-byte input to the STFPC311 through the D set to high while commands/data are transmitted, the serial communication is initialized and the ...

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STFPC311 Upon power application, the following modes are selected: ● Display Mode Setting: the 16-digit, 12-segment mode is selected (default: display off and key-scan on). ● Remote Control Protocol Setting: RC-5. ● Watchdog Timer Setting: Turned on with 10s. After ...

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Commands When the application is powered-up, the normal operation mode and address increment mode is set with the default display memory address set to 00H. In the auto-increment address mode, the address command is sent once, followed by the ...

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STFPC311 Table 4. STFPC311 Address setting mode bit 3 through bit 0 settings 6 Commands 21/39 ...

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Programmable hotkeys 7 Programmable hotkeys 7.1 IR Remote control Eight (8) commands are user programmable for hot key functions. The address of the appliance (8-bit) is stored first into the internal RAM. Then, the command for the hot keys ...

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STFPC311 Figure 20. Recommended software flow Note: Resetting the front panel controller at ¾ of the set watchdog time is recommended. 7 Programmable hotkeys 23/39 ...

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Default status 8 Default status 8.1 Power-up default status Table 5. Default States ° Display 2 Key-scan Display mode 5 Display address 6 RC Protocol 7 LED 8 Dimming 9 Hot Kets (IR ...

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STFPC311 9 Remote control protocols 9.1 RC-5 remote control RC-5 remote control protocol is based on Bi-phase (also known as Manchester) encoding as shown in Figure 21. Note: The encoding is set with reference to the IR_DATA_IN signal (after the ...

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Remote control protocols 9.2 SPI interface IR data transmission The IR data is sent on the DOUT pin of the SPI interface when the micro controller issues a IR data read command. The data is sent in 3 bytes ...

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STFPC311 Figure 26. NEC protocol transmission waveforms 9 Remote control protocols 27/39 ...

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... These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents. Table 6. ...

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STFPC311 10.1 Power consumption estimation The maximum power consumption is comprised of the Vacuum Florescent Display (VFD) driver dissipation, Load Resistance (RL), LED driver dissipation, and dynamic power consumption LED + P MAX FD ...

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Electrical characteristics 11 Electrical characteristics Table 8. Electrical specifications (T = -20 to +70° Symbol Parameter V High-Level Output Voltage LED1 – LED4, I OH1 V Low-Level Output Voltage OL1 V Low-Level Output Voltage OL2 I High-Level ...

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STFPC311 12 Timing characteristics Table 10. Timing characteristics ( V Typical values are at T Symbol Parameter PW Clock Pulse Width CLK PW Strobe Pulse Width STB t Data Setup Time SETUP t Data Hold Time HOLD t Clock-Strobe Time ...

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Serial communication format 13 Serial communication format When data is read, a wait time (t clock that has set the command, and the falling edge of the first clock that has read the data. This is required by the ...

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STFPC311 Figure 30. Switching characteristic waveforms ...

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Serial communication format ● Command 1: sets display mode ● Command 2: sets data ● Command 3: sets address ● Data transfers display data (22 bytes max.) ● Command 4: controls display Figure 31. Updating display ...

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STFPC311 14 Typical application diagram Figure 33. Typical application circuit KEY 1 KEY ...

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Package mechanical data 15 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK These packages have a Lead-free second level interconnect. The category of second Level Interconnect is marked on the package and ...

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STFPC311 Table 11. PQFP52 - 10x10x2 mm. plastic quad flatpack, package mechanical data Figure 34. Package dimensions 15 Package mechanical data 37/39 ...

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Revision history 16 Revision history Table 12. Revision history Date Revision 09-May-2006 38/39 1 First release STFPC311 Change ...

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... STFPC311 Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...