Data I/O Techniques

• CCB Technique

Sanyo audio ICs input and output data using the Sanyo CCB (computer control bus) standard, which is a serial bus

format. This IC uses an 8-bit address CCB and uses the following addresses.

• Data Input Timing

No. 5875-5/15

LC72708E

I/O mode

Address

Function

B0

B1

B2

B3

A0

A1

A2

A3

Input

0

1

0

1

1

1

1

1

16-bit control data input

Output

1

1

0

1

1

1

1

1

Data output for the input clock (CL)

Input

0

0

1

1

1

1

1

1

Data input (in 8-bit units) for the layer 4 CRC check circuit

• Data Output Timing

Note:The DO pin is normally left open.

Since the DO pin is an n-channel open drain pin, the time required for the data to change from the low level to the high level depends on the value of

the pull-up resistor.

Internal data latching

Continued from preceding page.

Pin No.

Pin Name

Function

I/O

Circuit type

35

Reference voltage output (Vdda/2)

Output

37

34

2, 10, 24

11,23, 43

Analog system power supply

Analog system ground

Digital system power supply (4.5 to 5.5 V)

Digital system ground

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