The ADAU1781 can operate in one of two control modes: I2
參數(shù)資料
型號： EVAL-ADAU1781Z
廠商： Analog Devices Inc
文件頁數(shù)： 27/92頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR ADAU1781
標(biāo)準(zhǔn)包裝： 1
系列： SigmaDSP®
主要目的： 音頻編解碼器
嵌入式： 是，DSP
已用 IC / 零件： ADAU1781
主要屬性： 立體聲，24 位，8 ~ 96 kHz 采樣率，GUI 工具
次要屬性： *
已供物品： *
ADAU1781
Rev. B| Page 33 of 92
CONTROL PORTS
The ADAU1781 can operate in one of two control modes: I2C
control or SPI control.
The ADAU1781 has both a 4-wire SPI control port and a 2-wire
I2C bus control port. Each can be used to set the registers. The
part defaults to I2C mode but can be put into SPI control mode
by pulling the CLATCH
The control port is capable of full read/write operation for all
addressable registers. Most SigmaDSP core processing parameters
are controlled by writing new values to the parameter RAM using
the control port. Other functions, such as mute, input/output
mode control, and analog signal paths, can be programmed by
writing to the appropriate registers.
pin low three times.
All addresses can be accessed in either a single-address mode or
a burst mode. The first byte (Byte 0) of a control port write contains
the 7-bit chip address plus the R/W
The ADAU1781 has several mechanisms for updating audio
processing parameters in real time without causing pops or
clicks. The control port pins are multifunctional, depending on
the mode in which the part is operating.
bit. The next two bytes (Byte 1
and Byte 2) together form the subaddress of the register location
within the ADAU1781. All subsequent bytes (starting with Byte 3)
contain the data, such as control port data, register data, or
parameter RAM data. The number of bytes per word depends on
the type of data that is being written. The exact formats for
specific types of writes and reads are shown in Figure 39 to
Table 20 details these
multiple functions.
Table 20. Control Port Pin Functions
Pin
I2C Mode
SPI Mode
SCL/CCLK
SCL—input
CCLK—input
SDA/COUT
SDA—open-collector output
COUT—output
ADDR1/CLATCH
I2C Address Bit 1—input
CLATCH—input
ADDR0/CDATA
I2C Address Bit 0—input
CDATA—input
I2C PORT
The ADAU1781 supports a 2-wire serial (I2C-compatible)
microprocessor bus driving multiple peripherals. Two pins,
serial data (SDA) and serial clock (SCL), carry information
between the ADAU1781 and the system I2C master controller.
In I2C mode, the ADAU1781 is always a slave on the bus, meaning
it cannot initiate a data transfer. Each slave device is recognized by
a unique address. The address byte format is shown in Table 21.
The address resides in the first seven bits of the I2C write. The
LSB of this byte sets either a read or write operation. Logic 1
corresponds to a read operation, and Logic 0 corresponds to a
write operation. The full byte addresses, including the pin settings
and R/W
Burst mode addressing, where the subaddresses are automati-
cally incremented at word boundaries, can be used for writing
large amounts of data to contiguous memory locations. This
increment happens automatically after a single-word write unless a
stop condition is encountered. The registers in the ADAU1781
range in width from one to six bytes; therefore, the auto-increment
feature knows the mapping between subaddresses and the word
length of the destination register. A data transfer is always
terminated by a stop condition.
bit, are shown in Table 22.
Both SDA and SCL should have 2.0 k pull-up resistors on the
lines connected to them. The voltage on these signal lines should
not be more than AVDD1.
Table 21. I2C Address Byte Format
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
0
1
0
ADDR1
ADDR0
R/W
Table 22. I2C Addresses
ADDR1
ADDR0
R/W
Slave Address
0
0x70
0
1
0x71
0
1
0
0x72
0
1
0x73
1
0
0x74
1
0
1
0x75
1
0
0x76
1
0x77
Addressing
Initially, each device on the I2C bus is in an idle state and
monitoring the SDA and SCL lines for a start condition and
the proper address. The I2C master initiates a data transfer by
establishing a start condition, defined by a high-to-low transition
on SDA while SCL remains high. This indicates that an address or
an address and data stream follow. All devices on the bus respond
to the start condition and shift the next eight bits (the 7-bit
address plus the R/W
The R/
bit), MSB first. The device that recognizes
the transmitted address responds by pulling the data line low
during the ninth clock pulse. This ninth bit is known as an
acknowledge bit. All other devices withdraw from the bus at
this point and return to the idle condition.
W bit determines the direction of the data. A Logic 0 on the
LSB of the first byte means the master writes information to the
peripheral, whereas a Logic 1 means the master reads information
from the peripheral after writing the subaddress and repeating
the start address. A data transfer takes place until a stop condition
is encountered. A stop condition occurs when SDA transitions
from low to high while SCL is held high. Figure 37 shows the
timing of an I2C write, and Figure 38 shows an I2C read.
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