bu9768ak ROHM Co. Ltd., bu9768ak Datasheet - Page 12

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

A command code of “43” should be input in order to output the results of a key scan to the BU9768AK / BU9768AKV.
If CS is changed to HIGH level after the command code is input, the data in the key buffer is output synchronized to
the rise of CK.
Key data correspondence table
SA: State acknowledge signal
In normal modes: SA = LOW
In sleep modes : SA = HIGH
12
• The data D
• The output SA of the 32nd bit is a state acknowledge signal and outputs the current BU9768AK / BU9768AKV mode.
2) Transmission of key data
Standard ICs
KO
KO
KO
KO
KO
KO
1
2
(S
(S
3
4
5
6
41
42
)
)
0
, which is output synchronized to the rise of CS, is unstable and should not be used.
D
D
D
D
KI
D
D
11
16
21
26
1
6
1
CS
CK
DO
DI
LSB
D
D
D
D
KI
D
D
1
12
17
22
27
2
7
2
If there is data in the key buffer, DO will be LOW.
1
Command code: 43
1 byte (8 bits)
0
D
D
D
D
KI
D
D
13
18
23
28
3
8
3
0
0
D
D
D
D
KI
D
D
Fig. 8 Transmission of key data
14
19
24
29
4
9
4
0
1
D
D
D
D
D
KI
D
10
15
20
25
30
5
5
0
MSB
Don't Care
D
0
D
1
BU9768AK / BU9768AKV
D
32 bits
2
D
29
D
30
SA