STFPC311(2012) 查看數據表（PDF） - STMicroelectronics

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STFPC311
(Rev.:2012)

Front panel controller/driver with standby power management

STMicroelectronics 

STFPC311

12 Timing characteristics

Timing characteristics

Table 9.

Symbol

Timing characteristics

( VDD= 3.3 V, TA= -20 to 70°C, unless otherwise noted. Typical values are at TA= 25°C )

Parameter

Test conditions

Values

Unit

Min.

Typ.

Max.

PWCLK Clock Pulse Width

400

ns

PWSTB Strobe Pulse Width

1

µs

) tSETUP Data Setup Time

100

ns

t(s tHOLD Data Hold Time

100

ns

uc tCLK-STB Clock-Strobe Time

CLK ↑ → STB ↑

1

µs

rod tWAIT Wait Time (1)

CLK ↑ → CLK ↑

1

µs

P 1. Refer to page on Serial Communication Format.

- Obsolete Note:

The pulse width of the segment signal is derived from the oscillator frequency. The value

can be modified by trimming ROSC. One cycle of key scanning consists of one frame and

data of 12 x 2 matrices are stored in RAM.

The key scan is only at the end of the frame when the display is ON. When the display is

OFF, the key scan takes place continuously. The grid is turned off during the key scan.

Obsolete Product(s) Figure 29. Key scanning and display timing

Doc ID 12324 Rev 2

31/39

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