bu9768ak ROHM Co. Ltd., bu9768ak Datasheet - Page 10

• Manufacturer Part Number: bu9768ak
• Description: Driver Segmented Module With Input Function
• Manufacturer: ROHM Co. Ltd.

1. If there is an unused segment output
If there is segment output that is not used, depending on the panel, the transmission of the LCD display data can be
simplified by deciding the pin or pins to be used starting from S
and S
This figure shows an example in which the 30 segment outputs from S
nication is done in units of eight bits (one byte). For this reason, the data of S
not used, is input as dummy data. If the unit is not eight bits, this dummy data can be omitted, in which case the data
should be input after the command code, starting from the data of D
key scan output and not as segment output, the data for D
2. Control codes
The BU9768AK is designed to support various applications, depending on the combination of control codes used.
Depending on the type of display, either 1 / 2 bias drive or 1 / 3 bias drive may be selected.
1: 1 / 2 bias drive
0: 1 / 3 bias drive
In the sleep modes, all displays are turned off, and the oscillation of the OSC pin is stopped, enabling a lower power
consumption. In sleep modes, although all of the displays are turned off, key scans are enabled. For information on
key scans in the sleep modes, please refer to pages 15 to 22.
Various sleep modes can be selected, depending on the application.
10
• DP: Display mode control
• S
Standard ICs
0
and S
41
CS
CK
CS
CK
if only pin 44 is used as segment output).
DI
DI
1
LSB
: Sleep mode control
0
D
121
1
D
122
Command code: 42
1 byte (8 bits)
LCD display data
1 byte (8 bits)
A value of 0 LOW must always be input
for the 2 bits following D
0
D
123
0
D
124
0
D
125
0
126
D
Fig. 7 Simplified data communication
.
126
1
0
0
MSB
0
D
DP
25
121
D
to D
26
S
0
40
LCD display data
1 byte (8 bits)
(S
D
126
S
27
1
42
Control code
1 byte (8 bits)
31
cannot be omitted.
if pins 44 and 45 are used as segment output,
. However, even if Pins 44 and 45 are used as
D
K
11
28
0
to S
D
K
29
1
40
9
BU9768AK / BU9768AKV
are used, and assumes that commu-
D
and S
P
30
0
D
31
P
10
1
(from D
D
SC
32
25
to D
30
), which are