BU91799KV-M Datasheet, PDF (18/29 Pages) Rohm – Low Duty LCD Segment Driver for Automotive Application

BU91799KV-M MAX 200 segments (SEG50×COM4)
Initialize Sequence
Follow the Power-on sequence below to initialize condition.
Power on
↓
STOP condition
↓
START condition
↓
Issue slave address
↓
Execute Software Reset by sending ICSET command.
After Power-on and before sending initialize sequence, each register value, DDRAM address and DDRAM data are
random.
Start Sequence
Start Sequence Example1
No.
Input
1
Power on
↓
2
wait 100µs
↓
3
Stop
↓
4
Start
↓
5
Slave address
↓
6
ICSET
↓
7
BLKCTL
↓
8
DISCTL
↓
9
EVRSET1
10
EVRSET2
↓
11
ICSET
↓
12
ADSET
↓
13
Display Data
Display Data
Display Data
↓
14
Stop
↓
15
Start
↓
16
Slave address
↓
17
MODESET
↓
18
Stop
(*: don‟t‟ care)
D7 D6 D5 D4 D3 D2 D1 D0
Descriptions
VDD=0→5V
(Tr: Min 1ms to Max 500ms)
Initialize IC
Stop condition
Start condition
0 1 1 1 1 1 0 0 Issue slave address
1 1 1 0 1 0 1 0 Software Reset
1 1 1 1 0 * 0 0 Blink OFF
1 0 1 0 0 1 0 0 80Hz, Frame inv., Power save mode1
1 1 1 0 0 0 0 1 EVR: 001xx
1 1 1 1 1 0 0 1 EVR: 00101
1 1 1 0 1 0 0 1 External clock input
0 0 0 0 0 0 0 0 RAM address set
* * * * * * * * address
* * * * * * * * address
00h - 01h
02h - 03h
* * * * * * * * address 30h - 31h
Stop condition
Start condition
0 1 1 1 1 1 0 0 Issue slave address
1 1 0 0 1 0 * * Display ON, 1/3bias
Stop condition
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