BU97981KV-E2 Datasheet, PDF (29/50 Pages) Rohm – Multi-function LCD Segment Drivers

BU97981xxx Series MAX 196 segments (SEG49xCOM4)
Datasheet
OSC External Input Command (OSCSET)
MSB
LSB
D/C D6 D5 D4 D3 D2 D1 D0 Hex Reset
1^st byte Command
1
0
0
1
1
0
0
0 98h
-
2^nd byte Command
0
0
0
0
0 P2 P1 P0 -
00h
According to the command, 4type of clock mode selectable include external clock input mode.
Detail of this command function as follows.
Condition
Internal CLK (PWM generation OFF)
External CLK input for PWM (PWM generation OFF)
Internal CLK (PWM generation ON)
External CLK input for PWM (PWM generation ON)
External CLK input for Display (ROHM use only)
*: Don‟t care
P2 P1 P0
0
0
0
0
0
1
0
1
0
0
1
1
1
*
*
Reset state
○
(P2,P1,P0)=(0,0,1) : External PWM input mode
CLKIN：external PWM input available.
PWMOUT: “L” Output
*under the (P2,P1,P0)=(0,0,0) condition PWMOUT into same state
(P2,P1,P0)=(0,1,0) : PWM is made from integrated oscillation frequency
PWM width is set up by PWM1SET and PWM2SET command.
PWM waveform output from PWMOUT is set up by PWM2SET command.
(P2,P1,P0)=(0,1,1) : PWM is made from External CLK input from CLKIN
PWM width is set up by PWM1SET and PWM2SET command.
PWM waveform output from PWMOUT is set up by PWM2SET command.
The relation of OSC function control by each command is as follows
CLKIN terminal
External CLK
External PWM
PWMOUT terminal
PWMOUT
integrated OSC
SEG output
PWM
generation
(PWM1SET)
LED1
(KV: SEG48)
(MUV: SEG41)
(GU: G4SEG48)
Output
Control
Circuit
SEG output
PWM
generation
(PWM2SET)
PWM resolution
LED2,3
(KV: SEG47,46)
(MUV: SEG40,39)
(GU: SEG47,46)
OSCSET
command
PWMSET
command
Figure 18. OSC External Input
OUTSET
command
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TSZ02201-0A2A0D300110-1-2
10.Apr.2015 Rev.006