AV2722 データシートの表示（PDF） - Unspecified
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AV2722 Datasheet PDF : 29 Pages
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AV2722 (Preliminary)
SOFTWARE CONTROL INTERFACE
The AV2722 programmable registers can be programmed via the software control interface. Either 3-wire (MPU
type) or 2-wire (I2S) interface are supported. The MODE pin sets the selection of the software control interface.
MODE (PIN No. 22)
0
1
SOFTWARE CONTROL INTERFACE
2-wire I2S
3-wire MPU type
3-WIRE SERIAL COMMAND PORT
By default, the AV2722 is set to use the 3-wire, microprocessor-type interface (MPU). Because MODE pin is inter-
nally pulled up to default the chip in MPU programming mode. Therefore, the MODE pin can be “no-connect” if
MPU interface is used. The 3-wire serial command port receives serial input data (SDA), serial input clock (SCL)
and active low chip select (CSB). The serial data is clocked in by the rising edge of the serial input clock if CSB is
low. The 16 bit serial input data contains 8 address control bits followed by 8 data bits.
The address control bits are:
D[15:14] - chip ID. (For the AV2722, chip ID is binary “10”)
D[13] - read/write control bit. (For the AV2722, D[13]=1 for read and 0 for write)
D[12:8] - 5-bit programmable register address.
The data bits are:D[7:0] - 8 bit data.
An example is given to write into address ‘00010’ with data ‘0000_0100’.
CSB
SDA
SCL
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
1
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
CHIP ID R/W
5-BIT ADDRESS
8-BIT DATA
D15 D14
CHIP ID
Chip ID, D[15:14] =10
Read /Write D[13] = 0 for write
Address, [12:8] = 00010
Data, D[7:0] = 0000_0100
3-Wire MPU- type Serial Control Port Timing Diagram
10-29
January 22, 2004
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