STFPC320 데이터 시트보기 (PDF) - STMicroelectronics

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STFPC320

Front panel controller/driver with standby power management and real-time clock

STMicroelectronics 

Functional description

STFPC320

4.14

Initial state

On power application, the 1/16-pulse width is set and the display shows the value

configured in the VFD display RAM before entering the standby mode. Thus if HELLO is

required to be shown on the VFD upon wake-up, then the user must write the corresponding

digit and segments locations in the VFD display memory before going into the standby mode

of operation. Note that the VSS must be present in order to keep the VFD display active. The

value of the display changes only after user configuration.

If the user wishes to display the RTC value during standby, then the user must configure the

STFPC320 by sending the appropriate command. If the user does not configure the

STFPC320 to display the RTC in standby, the VFD shows the same value as was written in

the VFD display memory location.

Note that all the hot keys are disabled on power-up. Only the hotkeys (FP or RC) or RTC or

the low to high transition on the PIN_AV8 pin can be detected to wake-up the system from

standby condition.

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