BU97981KV-E2 Datasheet, PDF (18/50 Pages) Rohm – Multi-function LCD Segment Drivers

BU97981xxx Series MAX 196 segments (SEG49xCOM4)
Datasheet
CSB
SCL
SD
Internal Signal
RAM write
1st byte Command / 2nd byte Command
Address set command
Command
RAMWR command
Display data
D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
Address 00h
Address 01h
RAM write every 4bit
Address 02h
data lower than 4bit case
RAM write is canceled
CSB
SCL
SD
Internal Signal
RAM write
1st byte Command / 2nd byte Command
Address set command
Command
RAMWR command
Display data
D7 D6 D5 D4 D3 D2 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4
Address 00h
Address 30h
Address 31h
Addres00h
Auto increment
Return to address 00h
Figure 16. Display Data Transfer Method
Blink Function
This device has Blink function. Blink function is able to set each segment port individually.
Blink ON/OFF and Blink frequency are set by the BLKSET command.
Blink frequency varies, according to fCLK characteristics.
Blink setup of each segments are controlled by BLKWR command.
The write start address is specified by “BLKADSET” command. And this address will increment after finish writing blink
data every 4 bit. The relation of BLKWR command, blink ram data, and blinking segment port is below.
In case of data is “1”, segment will blink, on the other hand data is “0”, do not blink.
(In case data is written continuously, after write date at 30h (KV: SEG48), ram data will be written to 31h (dummy
address) and return to address 00h (SEG0) automatically.)
Please refer to following figure about Blink operation of each segment.
In case, SEG port assigned to GPO or LED port by OUTSET1 command, corresponding SEG address do not change
and used as dummy address.
1st Byte 2nd Byte 1st Byte 2nd Byte
Command Command Command Command
10000100 00000011 10000111 00000000
Command
11000000
abcd e f ^g h
i j k l mno p _…
Blink set
Blink Address set
Blink
RAMWR
Blink RAM data
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111ï½¥15ï½¥001
18/46
TSZ02201-0A2A0D300110-1-2
10.Apr.2015 Rev.006