BU9910KV Datasheet, PDF (10/15 Pages) Rohm – Status display LCD driver for PCs with I2C Bus interface

Multimedia ICs
BU9910KV
(2) Data structure
1) Wrote Mode
S
Address
2) Read Mode
1. Command register set
S
Address
W– A Command Reg. Byte A
Write Data Byte
Auto Increment
AP
W– A Command Reg. Byte A
2. Preset command register
S
Address
Sr
Address
RA
Read Data Byte
Auto Increment
RA
Read Data Byte
Auto Increment
–A _P
∗ In multi-master application, the preset command register mode is prohibited.
–A _P
(3) Mode settings table
1) Command Register (commands and pointers)
S: Start condition
P: Stop condition
Sr: Restart condition
A: Acknowledge
A: Acknowledge bar
D7
D6
D5
D4
D3
Disp
Frame freq.
Blink freq.
The all bit may be "0"during the reset procedure.
D2
D1
D0
Pointer register
D7: Display control
0: Light (depend on the LCD segment data memory status )
1: All off
D6, D5: Frame frequency select
D6
D5
f0
0
0 32Hz (default)
0
1
64Hz
1
0
128Hz
1
1
256Hz
At fosc = 32.768kHz
D4: Blink frequency select
0: Blink frequency = 0.5Hz (default)
1: Blink frequency = 1Hz
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