BU97981KV-E2 Datasheet, PDF (20/50 Pages) Rohm – Multi-function LCD Segment Drivers

BU97981xxx Series MAX 196 segments (SEG49xCOM4)
LCD Driver Bias/Duty Circuit
This LSI generates LCD driving voltage with on-chip Buffer AMP.
And it can drive LCD at low power consumption
Line and frame inversion can be set in MODESET command.
1/4duty, 1/3duty and static mode can be set DISCTL command.
About each LCD driving waveform, please refer to “LCD driving waveform” descriptions.
Datasheet
Initial state
Initial state, after Software Reset command input
1. Display off
2. All command register value set Reset state.
3. DDRAM address data and Blink address data are initializing
(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
(OUTSET1)
7
SEG/LED port change
(OUTSET2)
8
LED1 drive control (PWM1SET)
(H piece adjustment of PWM1)
9
LED2-3 drive control (PWM2SET)
(H piece adjustment of PWM2)
10 Display data RAM WRITE (RAMWR)
11 Blink RAM WRITE (BLKWR)
12 All Pixel ON (APON)
13 All Pixel OFF (APOFF)
14 All Pixel On/Off mode off (NORON)
15 Software Reset (SWRST)
16 OSC external input (OSCSET)
17 Integrated Regulator setup (REGSET)
18 GPO output set (GPOSET)
Function
Set LCD drive mode (display on/off, current mode)
Set LCD drive mode
(frame freq., line/frame inversion)
Set display data RAM address for RAMWR command
Set Blink mode on/off
Set Blink data RAM address for BLKWR command
Select segment output/general purpose output (GPO)
Select segment output/LED driving output
Set PWM1 signal “H” width for LED1 driving
Set PWM2 signal “H” width for LED2-3 driving
Write display data to display data RAM
Write Blink data to BLINK data RAM
Set all Pixel display on
Set all Pixel display off
Set normal display mode (APON/APOFF cancel)
Software Reset
Set External clock input
Set integrated regulator voltage output
Set GPO output data
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10.Apr.2015 Rev.006