BU91501KV-M Datasheet, PDF (20/34 Pages) Rohm – Multi- function LCD Segment Drivers

BU91501KV-M
Drive Control1 (DRV CTRL1)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
1
1
0
0 P3 P2 P1 0
P3: 1/3 duty drive or 1/4 duty drive switching control data
This control data bit selects either 1/3 duty drive or 1/4 duty drive.
P3 Duty mode
Status of (COM4/
S41)
Reset
conditions
0
1/4
COM4
○
1
1/3
(Note12) COM4: COMMON output
S41: SEGMENT output
S41
P2,P1 : Frame frequency switching control data
These control data bits select Frame frequency setting.
Setting
P2
P1
Reset
conditions
80Hz
0
0
○
100Hz
0
1
120Hz
External Clock
input
1
0
1
1
Relationships between Frame frequency (fFR) and Divide number
P2 P1
Divide number
1/3 Duty
1/4 Duty
fFR [Hz]
1/3 Duty
1/4 Duty
0
0
510
512
80
80
0
1
408
408
100
100
1
0
342
344
120
120
1
1
2040
2048
-
-
Formula to calculate Frame frequency from frequency and Divide number:
“Frame frequency = frequency / Divide number”
Ex) In case, 1/4 Duty mode,(P2,P1) = (0,0)
fFR = 40.96[KHz] / 512 = 80[Hz]
(Note13) Built-in Oscillator circuit frequency = 40.96 KHz (typ).
Datasheet
Drive Control2 (DRV CTRL2)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
1
1
0
1
0 P2 P1 0
P2: 1/3 bias drive or 1/2 bias drive switching control data
This control data bit selects either 1/3 bias drive or 1/2 bias drive.
P2
Bias mode
Reset
conditions
0
1/2
1
1/3
○
P1: Line Inversion or Frame Inversion switching control data
This control data bit selects either line inversion drive or frame inversion drive.
P1
Inversion
mode
Reset
conditions
0
Line
○
1
Frame
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8.July.2015 Rev.001