BU91797MUF-M Datasheet, PDF (17/27 Pages) Rohm – Low Duty LCD Segment Driver for Automotive application

BU91797MUF-M MAX 144 segments (SEG36×COM4)
Start Sequence Example2
Initialize
Initialize Sequence
DISPON
DISPON Sequence
RAM Write
RAM Write Sequence
DISPOFF
DISPOFF Sequence
Datasheet
BU91797MUF-M is initialized with Start Sequence, starts to display with “DISPON Sequence”, updates display data with
“RAM Write Sequence” and stops the display with “DISPOFF Sequence”.
Execute “DISPON Sequence” in order to restart display.
Initialize Sequence
Input
Power on
wait 100us
STOP
START
DATA
D7 D6 D5 D4 D3 D2 D1 D0
Slave address
ICSET
MODESET
ADSET
Display data
…
01111100
11101010
11000000
00000000
********
STOP
Description
Execute Software Reset
Display OFF
RAM address set
Display data
DISPON Sequence
Input
DATA
D7 D6 D5 D4 D3 D2 D1 D0
START
Slave address 0 1 1 1 1 1 0 0
ICSET
11101000
DISCTL
10111111
BLKCTL
11110000
APCTL
11111100
MODESET
11001000
STOP
Description
Execute internal OSC mode
Set Display Control
Set BLKCTL
Set APCTL
Display ON
RAM Write Sequence
Input
START
Slave address
ICSET
DISCTL
BLKCTL
APCTL
MODESET
ADSET
Display Data
…
STOP
DATA
D7 D6 D5 D4 D3 D2 D1 D0
01111100
11101000
10111111
11110000
11111100
11001000
00000000
********
Description
Execute internal OSC mode
Set Display Control
Set BLKCTL
Set APCTL
Display ON
RAM address set
Display data
DISPOFF Sequence
Input
DATA
D7 D6 D5 D4 D3 D2 D1 D0
START
Slave address 0 1 1 1 1 1 0 0
ICSET
11101000
MODESET
11000000
STOP
Description
Execute internal OSC mode
Display OFF
Abnormal operation may occur in BU91797MUF-M due to the effect of noise or other external factor.
To avoid this phenomenon, it is highly recommended to input command according to sequence described above
during initialization, display ON/OFF and refresh of RAM data.
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21.Dec.2015 Rev.001