Command 4: Display Control Commands

The Display Control Commands are used to turn ON or OFF a display. It also used to set the pulse width. Please refer to

the diagram below. When the power is turned ON, a 1/16 Pulse width is selected and the displayed is turned OFF (the key

scanning is started).

SCANNING AND DISPLAY TIMING

The key Scanning and Display Timing diagram is given below. One cycle of key scanning consists of 2 frames. The data

of the are 10 x 3 matrix is stored in the RAM.

SG Output

DIG1

DIG2

DIG3

DIGn

DIG1

G1

G2

G3

Gn

Key Scan Data

Tdisplay-500us

1 Frame=Tdispaly ¦Ö (n+1)

SERIAL COMMUNICATION FROMAT

The following diagram shows the HT1668 serial communication format. The DOUT Pin is an N-channel, opendrain output

LED Driver IC

HT1668

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