stled325 STMicroelectronics, stled325 Datasheet - Page 53

• Manufacturer Part Number: stled325
• Description: I?c Interfaced, Advanced Led Controller/driver With Keyscan, Standby Power Management And Real Time Clock Rtc
• Manufacturer: STMicroelectronics

STLED325
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.
Outputs
SEG1
SEG2
SEG3
Grid
SEGn
t=1/16 of
tDISP=500us
tDISP
DIG1
DIG2
Doc ID 17576 Rev 1
tFRAME=tDISP * (n+1)
DIG3
-----------
DIGn
n = number of digits
Key Scan
DIG1
Commands
AM04168V1
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