BU97930MUV_15 Datasheet, PDF (10/32 Pages) Rohm – Multifunction LCD Segment Driver

BU97930MUV MAX 108 segments (SEG27×COM4)
○LCD Driver Bias/Duty Circuit
BU97930MUV generates LCD driving voltage using an on-chip Buffer AMP.
Also, it can drive LCD with low power consumption
*Line and frame inversion can be set by MODESET command.
*1/4duty, 1/3duty and static mode can be set by DISCTL command.
About each LCD driving waveform, please refer to “LCD driving waveform” descriptions.
○Initial state
Initial state after SWRST command input
○Display off
○All command register values are in Reset state.
○DDRAM address data and Blink address data are initialized
(DDRAM data and Blink RAM data are not initializing.
Please write DDRAM data and Blink RAM data before Display on.)
●Command / Function list
Function description table
NO Command
1 Mode Set (MODESET)
2 Display control (DISCTL)
3 Address set (ADSET)
4 Blink set (BLKSET)
5 Blink address set (BLKADSET)
6
SEG/GPO port change
(OUTSET)
7
LED drive control (PWMSET)
(H piece adjustment of PWM)
8 RAM WRITE (RAMWR)
9 Blink RAM WRITE (BLKWR)
10 All Pixel ON (APON)
11 All Pixel OFF (APOFF)
12 All Pixel On/Off mode off (NORON)
13 Software Reset (SWRST)
14 OSC external input (OSCSET)
15 GPO output set (GPOSET)
Function
Sets LCD drive mode (display on/off, current mode)
Sets LCD drive mode
(frame freq., line/frame inversion)
Sets display data RAM address for RAMWR command
Sets Blink mode on/off
Sets Blink data RAM address for BLKWR command
Selects segment output/general purpose output (GPO)
Sets PWM1 signal “H” width for LED driving
Writes display data to display data RAM
Writes Blink data to BLINK data RAM
Sets all Pixel display on
Sets all Pixel display off
Sets normal display mode (APON/APOFF cancel)
Software Reset
Enables External clock input
Sets GPO output data
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