BU94601KV_12 Datasheet, PDF (17/70 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card + iPod

BU94601KV BU94603KV BU94604BKV
Datasheet
10. KEY input format
3x4 matrix command input
Signal name I/O
Function
KEY_ROW1 I
-
KEY_ROW2 I
-
KEY_ROW3 I
-
KEY_ROW4 I KEY matrix I/O signal
-
KEY_COL1 O
-
KEY_COL2 O
-
KEY_COL3 O
-
Remarks
Configure a circuit for the matrix signals terminals for KEY commands as shown in the applied circuit diagram
figure 9.
The operation corresponding to the key pressed over the circuit is performed.
Details of each operation are explained in Chapter 21.
+10
REPEAT RANDOM CHG_DEV
VOL-
VOL+
FOL-
FOL+
FB
PLAY/
PAUSE
STOP
FF
KEY_ KEY_ KEY_ KEY_
ROW1 ROW2 ROW3 ROW4
KEY_ KEY_ KEY_
COL1 COL2 COL3
Figure 9 KEY Matrix Applied Circuit Diagram
11. I²C interface format
I²C serial interface
Signal name I/O
Function
SCL
I I²C interface clock input
SDA
I/O I²C interface data I/O
A0
I Slave address selection terminal
A1
I Slave address selection terminal
Remarks
-
-
Slave address [0] bit setting terminal
Slave address [1] bit setting terminal
This is an I²C serial interface terminal. By inputting L to SEL_SLAVE terminal, the interface terminal becomes
enabled.
The terminal supports slave I²C operation.
11.1 I²C protocol
When I²C bus is in IDLE, SDA and SCL are set to H by the external Pull-up resistance. When starting
communications, the master sets SDA to L while SCL is set to H (Start condition). When ending communications,
the master sets SDA to H while SCL is set to H (Stop condition). During transfer, SDA is changed only when SCL
is set to L. Figure 10 shows Start condition, Stop condition of I²C.
SCL
SDA
1
2
MSB
Start
condition
8
9
LSB
ACK
1
9
ACK
Stop
condition
Figure 10 I²C start, stop condition
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TSZ22111・15・001
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TSZ02201-0V2V0E600010-1-2
2012.07.12 Rev.001