Continued from preceding page.
Pin No. Pin Name
LC72708E
Function
I/O
Circuit type
35
VREF
Reference voltage output (Vdda/2)
Output
37
VDDA Analog system power supply
—
34
VSSA
Analog system ground
—
2, 10, 24 VDDD Digital system power supply (4.5 to 5.5 V)
—
11,23, 43 VSSD Digital system ground
—
Note: A capacitor of at least 2000 pF must be inserted between VDDD and VSSD when using this IC.
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.
Address
I/O mode
B0 B1 B2 B3 A0 A1 A2 A3
Function
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 Input Timing
• Data Output Timing
Internal data latching
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.
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