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參數(shù)資料
型號(hào)： ADAU1361BCPZ-RL
廠商： Analog Devices Inc
文件頁數(shù)： 32/80頁
文件大?。?/td> 0K
描述： IC CODEC 24B PLL 32LFCSP
標(biāo)準(zhǔn)包裝： 5,000
類型： 音頻編解碼器
數(shù)據(jù)接口： 串行
分辨率（位）： 24 b
ADC / DAC 數(shù)量： 2 / 2
三角積分調(diào)變： 無
電壓 - 電源，模擬： 1.8 V ~ 3.6 V
電壓 - 電源，數(shù)字： 1.8 V ~ 3.6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 32-VFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 32-LFCSP-VQ
包裝： 帶卷 (TR)
ADAU1361
Rev. C | Page 38 of 80
CONTROL PORTS
The ADAU1361 can operate in one of two control modes:
I2C control
SPI control
The ADAU1361 has both a 4-wire SPI control port and a
2-wire I2C bus control port. Both ports can be used to set the
registers. The part defaults to I2C mode, but it can be put into
SPI control mode by pulling the CLATCH pin low three times.
The control port is capable of full read/write operation for all
addressable registers. The ADAU1361 must have a valid master
clock in order to write to all registers except for Register R0
(Address 0x4000) and Register R1 (Address 0x4002).
All addresses can be accessed in both 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 bit. The next two
bytes (Byte 1 and Byte 2) together form the subaddress of the
register location within the ADAU1361. This subaddress must
be two bytes long because the memory locations within the
ADAU1361 are directly addressable and their sizes exceed the
range of single-byte addressing. All subsequent bytes (starting
with Byte 3) contain the data. The number of bytes per word
depends on the type of data that is being written.
The control port pins are multifunctional, depending on the
mode in which the part is operating. Table 20 describes these
multiple functions.
Table 20. Control Port Pin Functions
Pin Name
I2C Mode
SPI Mode
SCL/CCLK
SCL: input clock
CCLK: input clock
SDA/COUT
SDA: open-collector
input/output
COUT: output
ADDR1/CDATA
I2C Address Bit 1: input
CDATA: input
ADDR0/CLATCH
I2C Address Bit 0: input
CLATCH: input
BURST MODE WRITING AND READING
Burst mode addressing, where the subaddresses are automatically
incremented at word boundaries, can be used for writing large
amounts of data to contiguous registers. This increment happens
automatically after a single-word write or read unless a stop condi-
tion is encountered (I2C) or CLATCH is brought high (SPI). A
burst write starts like a single-word write, but following the first
data-word, the data-word for the next immediate address can be
written immediately without sending its two-byte address.
The registers in the ADAU1361 are one byte wide with the
exception of the PLL control register, which is six bytes wide.
The autoincrement feature knows the word length at each
subaddress, so the subaddress does not need to be specified
manually for each address in a burst write.
The subaddresses are autoincremented by 1 following each
read or write of a data-word, regardless of whether there is a
valid register word at that address. Address holes in the register
map can be written to or read from without consequence. In
the ADAU1361, these address holes exist at Address 0x4001,
Address 0x4003 to Address 0x4007, Address 0x402E, and
Address 0x4032 to Address 0x4035. A single-byte write to these
registers is ignored by the ADAU1361, and a read returns a
single byte 0x00.
I2C PORT
The ADAU1361 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 ADAU1361 and the system I2C master controller.
In I2C mode, the ADAU1361 is always a slave on the bus,
meaning that it cannot initiate a data transfer. Each slave device
is recognized by a unique address. The address and R/W byte
format is shown in
. The address resides in the first
seven bits of the I2C write. Bits[5:6] of the I2C address for the
ADAU1361 are set by the levels on the ADDR1 and ADDR0
pins. The LSB of the address—the R/
W bit—specifies either a
read or write operation. Logic Level 1 corresponds to a read
operation, and Logic Level 0 corresponds to a write operation.
Table 21. ADAU1361 I2C Address and Read/Write 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
The SDA and SCL pins should each have a 2 kΩ pull-up resistor
on the line connected to it. The voltage on these signal lines
should not be higher than IOVDD (1.8 V to 3.3 V).
Addressing
Initially, each device on the I2C bus is in an idle state and
monitors 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/
data stream follows. All devices on the bus respond to the start
condition and shift the next eight bits (the 7-bit address plus the
R/W 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.
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