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STLED325 Datasheet(PDF) 53 Page - STMicroelectronics

Part # STLED325
Description  Standby power management to host
PDF  62 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STLED325 Datasheet(HTML) 53 Page - STMicroelectronics

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STLED325
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Doc ID 17576 Rev 1
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7.6
Keyscanning and display timing
Figure 20.
Keyscanning and display timing
The value is fixed by the internal clock from the oscillator.
One cycle of keyscanning consists of one frame, and data of 8x2 matrices are stored in the
RAM.
Note that the keyscan is only at the end of the frame when the display is ON. When the
display is OFF, the keyscan takes place continuously. The grid/digit is turned off during the
keyscan.
AM04168V1
DIG1
DIG2
DIG3
-----------
Key Scan
Grid
Outputs
DIGn
DIG1
tDISP=500us
SEG1
SEG2
SEG3
SEGn
t=1/16 of
tDISP
tFRAME=tDISP * (n+1)
n = number of digits



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