BU97981KV-E2 Datasheet, PDF (25/50 Pages) Rohm – Multi-function LCD Segment Drivers

BU97981xxx Series MAX 196 segments (SEG49xCOM4)
Datasheet
Change Command of a SEG/LED port (OUTSET2)
MSB
LSB
D/C D6 D5 D4 D3 D2 D1 D0 Hex Reset
1^st byte Command
1
0
0
0
1
0
0
1 89h
-
2^nd byte Command
0
0
0
0
0 P2 P1 P0
-
00h
This command affects segment port/LED port selection and PWM resolution set up.
P2: Resolution setting
Setting
P2
12bit resolution mode
0
8bit resolution mode
1
Reset condition
○
P1 to P0: select SEG driving mode or LED driving mode, this command affect at SEG46 to SEG48 port.
The effective address is 00h to 03h. In case LED driving mode is selected, output turns into “NMOS Open Drain”
from segment output.
The state of the output terminal in case P1 to P0 are setup is shown below
(BU97981KV, BU97981GU)
Setting
SEG Terminal state (SEG output/LED output)
P1 P0 SEG46 Terminal SEG47 Terminal SEG48 Terminal
0
0
SEG46
SEG47
SEG48
0
1
SEG46
SEG47
LED1
1
0
SEG46
LED2
LED1
1
1
LED3
LED2
LED1
(BU97981MUV)
Setting
P1 P0
0
0
0
1
1
0
1
1
SEG Terminal state (SEG output/LED output)
SEG39 Terminal SEG40 Terminal SEG41 Terminal
SEG39
SEG40
SEG41
SEG39
SEG40
LED1
SEG39
LED2
LED1
LED3
LED2
LED1
In this case, DDRAM address and a Blink RAM address of SEG port that set up to LED port, do not change.
The address assigned to LED port is used as dummy address respectively.
The output state of GPO, LED, and PWMOUT port under the INHb H/L, display on/off, and RESET state are listed
below.
Control
port
GPO
PWMOUT
INHb
H
According to
GPOSET
command
According to
PWM2SET
command
L
Low Fix
Low Fix
According to
LED PWM1/PWM2SET
Hi-Z
command
DISPLAY
ON
OFF
According to
GPOSET
command
According to
GPOSET
command
According to
PWM2SET
command
According to
PWM2SET
command
RESET state
GPO unselected
(All SEG output)
Low Fix
According to
According to
PWM1/PWM2SET PWM1/PWM2SET
command
command
LED unselected
(All SEG output)
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TSZ02201-0A2A0D300110-1-2
10.Apr.2015 Rev.006