BU97931FV Datasheet, PDF (9/32 Pages) Rohm – Multifunction LCD Segment Driver

BU97931FV MAX 112 segments (SEG28×COM4)
○Blink function
This device has Blink function. Blink function can 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 segment is controlled by BLKWR command.
The write start address is specified by “BLKADSET" command. And this address will automatically increment after
receiving every 4 bit s of blink data. The relation of BLKWR command, blink ram data, and blinking segment port is below.
In case data is “1”, segment will blink, on the other hand when data is “0”, segment will not blink.
(In case data is written continuously after write data at 1Bh (SEG27), address will return to 00h (SEG0) automatically.)
Please refer to the following figures about Blink operation of each segment.
In case SEG port assigned to GPO port by OUTSET command, corresponding SEG address does not change and is used
as a dummy address.
1st Byte 2nd Byte 1st Byte 2nd Byte
Command Command Command Command Command
10000100 00000011 10000111 00000000 11000000 _{a b c d e f g h i j k l m n o p …}
Blink set
Blink Address set
Blink
RAMWR
Blink RAM data
Blink RAM address
00
01
02
03
04
05
06
07
・・・
19h
1Ah 1Bh
0a
e
i
m
COM0
1b
f
j
n
COM1
2c
g
k
o
BIT
3d
h
l
p
COM2
COM3
SEG
0
SEG
1
SEG
2
SEG
3
SEG
4
SEG
5
SEG
6
SEG
7
・・・
SEG SEG SEG
25
26
27
DDRAM data
SEG A
SEG B
SEG C
SEG D
Blink RAM data
SEG A
SEG B
SEG C
SEG D
Segment output
SEG A
SEG B
SEG C
SEG D
SEG A
SEG B
SEG C
SEG D
SEG A
SEG B
SEG C
SEG D
Blink frequency
under the 2Hz stting segment output will blink every 0.5 second (ON->OFF->ON)
SEG A
SEG B
SEG C
SEGA/B is blink
SEG D
Figure 9. Blink Operation
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TSZ02201-0A0A2D300070-1-2
10.Apr.2015 Rev.004