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BU9797FUV-M Datasheet, PDF (18/28 Pages) Rohm – Integrated Buffer AMP for LCD Driving
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BU9797FUV-M MAX 144 segments (SEG36×COM4)
Start sequence example2
Initialize
DISPON
RAM write
DISPOFF
Initialize Sequence
DISPON Sequence
RAM write Sequence
DISPOFF Sequence
Datasheet
This LSI is initialized with Initialize Sequence. And start to display with DISPON Sequence.
This LSI will update display data with RAM write Sequence. And stop the display with DISPOFF sequence.
If you want to restart to display, This LSI will restart to display with DISPON Sequence.
Initialize sequence
Input
Power on
Wait 100us
STOP
START
Slave address
APOFF
MODESET
ICSET
DISCTL
ICSET
ADSET
Display Data
DATA
D7 D6 D5 D4 D3 D2 D1 D0
Description
0
1
1
1
1
1
0
0 7C
1
1
1
1
1
1
0
1 Set all pixel off
1
1
0
*
0
0
*
* Set display off
1
1
1
0
1
0
1
0 Software reset
1
0
1
1
0
1
1
0 Set DISCTL setting
1
1
1
0
1
0
0
0 Set MSB of RAM address
0
0
0
0
0
0
0
0 Set RAM address
*
*
*
*
*
*
*
*
STOP
DISPON sequence
Input
START
Slave address
DISCTL
BLKCTL
APCTL
MODESET
STOP
DATA
D7 D6 D5 D4 D3 D2 D1 D0
Description
0
1
1
1
1
1
0
0 7C
1
0
1
1
0
1
1
0 Set DISCTL setting
1
1
1
1
0
0
0
0 Set blink setting
1
1
1
1
1
1
0
0 Close all pixel on/off function
1
1
0*
1
0
*
* Set display on
RAM write sequence
Input
DATA
D7 D6 D5 D4 D3 D2 D1 D0
Description
START
Slave address
0
1
1
1
1
1
0
0 7C
DISCTL
1
0
1
1
0
1
1
0 Set DISCTL setting
BLKCTL
1
1
1
1
0
0
0
0 Set blink setting
APCTL
1
1
1
1
1
1
0
0 Close all pixel on/off function
MODESET
1
1
0
0
1
0
0
0 Set display on
ICSET
1
1
1
0
1
0
0
0 Set MSB of RAM address
ADSET
0
0
0
0
0
0
0
0 Set RAM address
Display Data
*
*
*
*
*
*
*
*
STOP
DISPOFF sequence
Input
START
Slave address
MODESET
STOP
D7 D6
0
1
1
1
DATA
D5 D4 D3
1
1
1
0
0
0
D2 D1 D0
Description
1
0
0 7C
0
0
0 Set display off
*: don‟t care
Abnormal operation may occur in BU9797FUV due to the effect of noise or other external factor.
To avoid this phenomenon, please input command according to sequence described above during initialization, display
ON/OFF and refresh of RAM data.
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26.Aug.2013 Rev.001
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