STFPC320 datasheet(33/78 Pages) STMICROELECTRONICS

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STFPC320

Commands

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Commands

A command sets the display mode and status of the VFD driver.

The first 1 byte input to the STFPC320 through the SDA pin after the slave address is

regarded as a command. If slave address is not transmitted before the commands/data are

transmitted, the commands/data being transmitted are invalid (however, the commands/data

already transmitted remain valid).

7.1

Configuration mode setting command

This command initializes the STFPC320 and performs any one of the following functions:

Selects the number of segments and number of grids (1/8 to 1/16 duty, 12 segments to

20 segments). When this command is executed, display is turned off. To resume

display, the display ON command must be executed. If the same mode is selected,

nothing is performed.

Selects the remote control protocol to use.

Sets the guard timer. The guard timer is configurable from 1 to 15s or turned off

completely.

Sets the guard timer action to perform when the guard timer counts. Two actions are

allowed: no action, set STBY to high level.

Description:

Bits b7-b6 = 00 is decoded as a configuration mode setting command. The

subsequent bits are decoded as follows:

b5: Reserved

b4: Normal display setting

b3: RTC display setting (during normal or STBY modes)

b2: enables all RC keys as hot-keys

b1: Reserved

b0: enables the guard timer to issue STBY

Note:

When displaying the RTC during normal mode, if the µP is writing data to STFPC320 using

I2C bus, the RTC display on VFD momentarily turns OFF.

MSB

LSB

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