BU9794AKV Datasheet, PDF (15/26 Pages) Rohm – Standard LCD Segment Driver

BU9794AKV MAX 200 Segments (SEG50×COM4)
●Initialize sequence
Please follow below sequence after Power-on to set BU9794AKV to initial condition.
Power on
↓
CSB „H‟ … Initialize Interface
↓
CSB „L‟ …Start interface data transfer
↓
Execute Software Reset by sending SWRST command.
*Each register value and DDRAM address, DDRAM data are random condition after power on till initialize sequence is executed.
●Start sequence
○Start sequence example 1
No.
Input
1
Power on
↓
2
wait 100us
↓
3
CSB „H‟
↓
4
CSB „L‟
↓
5
SWRST
↓
6
BLKCTL
↓
7
MODESET
↓
8
DISCTL
↓
9
ADSET
↓
10
Display Data
Display Data
D7 D6 D5 D4 D3 D2 D1 D0
Descriptions
VDD=0 to 5V (Tr=0.1ms)
Initialize IC
Initialize I/F data
I/F Data transfer start
1 1 1 0 1 0 1 1 Software Reset
11110 * 01
11000110
11010001
0 0 0 0 0 0 0 0 RAM address set
* * * * * * * * address 00h to 01h
* * * * * * * * address 02h to 03h
Display Data
* * * * * * * * address 30h to 31h
11
CSB „H‟
I/F Data transfer stop
↓
12
CSB „L‟
I/F Data transfer start
↓
13
MODESET
1 1 0 0 1 1 1 0 Display ON
↓
14
CSB „H‟
I/F Data transfer stop
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