BU94605AKV Datasheet, PDF (24/84 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card +CD-ROM+MP3 Record

BU94605AKV BU94607AKV BU94702AKV BU94705AKV
Datasheet
8. I²C command interface
Slave I²C serial interface
Signal name
SCL
SDA
I/O
Function
I I²C interface clock input
I/O I²C interface data I/O
A0
I Slave address selection terminal
A1
I Slave address selection terminal
Remarks
External pull-up resistor is required.
External pull-up resistor is required.
Slave address [0] bit setting terminal
Slave address [1] bit setting terminal
This is an I²C serial interface terminal to communicate with the microcomputer (master).
It supports slave I²C operations.
Supports the standard mode (100kbps) and the fast mode (400kbps).
Supports 7-bit addresses.
8.1 I²C protocol
When the I²C bus is in the IDLE state, SDA and SCL are set to H by the external Pull-up resistor.
To start communications, the master sets SDA to L while SCL set to H (Start condition). To finish communications, the
master sets SDA to H while SCL set to H (Stop condition). During transfer, the master changes SDA only while SCL is L.
Figure 23 shows Start condition, Stop condition of I²C.
Figure 23. I²C Start and Stop Conditions
8.2 Slave address
I²C bus slave addresses support the 7-bit addressing mode. By inputting to terminals A0 and A1, the bus slave address
can be selected as shown in Table 8. Figure 24 shows the slave address transfer format.
S
A6
A5
A4
A3
A2
A1
A0 R/W ACK
Start
condition
Slave Address
R / W = Read / Write Pulse
ACK = Acknowledge
sent by
slave
Figure 24. Slave Address Transfer Format
MSB
A6
1
1
1
1
Table 8. Settable Slave Addresses
A5
A4
A3
A2
A1
terminal
LSB
A0
terminal
0000
0
0
0000
0
1
0000
1
0
0000
1
1
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TSZ02201-0V2V0E600090-1-2
2012.12.10 Rev.002