參數(shù)資料
型號(hào)： ADAU1702JSTZ-RL
廠商： Analog Devices Inc
文件頁數(shù)： 20/52頁
文件大小： 0K
描述： IC AUDIO PROC 2ADC/4DAC 48-LQFP
標(biāo)準(zhǔn)包裝： 2,000
系列： SigmaDSP®
類型： 音頻處理器
應(yīng)用： 車載，監(jiān)視器，MP3
安裝類型： 表面貼裝
封裝/外殼： 48-LQFP
供應(yīng)商設(shè)備封裝： 48-LQFP（7x7）
包裝： 帶卷 (TR)
ADAU1702
Rev. C | Page 27 of 52
SELF-BOOT
On power-up, the ADAU1702 can load a program and a set
of parameters that have been saved in an external EEPROM.
Combined with the auxiliary ADC and the multipurpose pins,
this eliminates the need for a microcontroller in the system. The
self-booting is accomplished by the ADAU1702 acting as a master
on the I2C bus on startup, which occurs when the SELFBOOT
pin is set high. The ADAU1702 cannot self-boot in SPI mode.
The maximum necessary EEPROM size for program and para-
meters is 6688 bytes, or just over 6.5 kB. This does not include
register settings or overhead bytes, but such factors do not add a
significant number of bytes. This much memory is only needed
if the program RAM (512 × five bytes), parameter RAM (1024 ×
four bytes), and interface registers (8 × four bytes) are completely
full. Most applications do not use the full program and parameter
RAMs, thus, an 8 kB EEPROM should be sufficient.
A self-boot operation is triggered on the rising edge of RESET
when the SELFBOOT and WP pins are set high. The ADAU1702
reads the program, parameters, and register settings from the
EEPROM. After the ADAU1702 finishes self-booting, additional
messages can be sent to the ADAU1702 on the I2C bus, although
this typically is not necessary in a self-booting application. In
self-boot mode, the I2C device address is 0x68 for a write and
0x69 for a read. The ADDRx pins have different functions
when the chip is in this mode, so the settings on them can be
ignored.
The ADAU1702 does not self-boot if WP is set low. Holding
this pin low allows the EEPROM to be programmed in-circuit.
The WP pin is pulled low (it typically has a resistor pull-up) to
enable writes to the EEPROM, but this in turn disables the self-
boot function until the WP pin is returned high.
The ADAU1702 is a master on the I2C bus during self-boot and
writeback. Although it is uncommon for an application using
self-boot to also have a microcontroller connected to the control
lines, care should be taken that no other device tries to write to the
I2C bus during self-boot or writeback. The ADAU1702 generates
SCL at 8 × fS; therefore, for a fS of 48 kHz, SCL runs at 384 kHz.
SCL has a duty cycle of 3/8 in accordance with the I2C specification.
The ADAU1702 reads from EEPROM Chip Address 0xA1. The
LSBs of the addresses of some EEPROMs are pin configurable;
in most cases, these pins should be tied low to set this address.
EEPROM Format
The EEPROM data contains a sequence of messages. Each
discrete message is one of the seven types defined in Table 18
and consists of a sequence of one or more bytes. The first byte
identifies the message type. Bytes are written MSB first. Most
messages are block write (0x01) types, which are used for writing
to the ADAU1702 program RAM, parameter RAM, and control
registers.
The body of the message following the message type should
start with a 0x00 byte; this is the chip address. As with all other
control port transactions, following the chip address is a two-byte
register/memory address field.
Figure 28 shows an example of what should be stored in the
EEPROM, starting with EEPROM Address 0. In this example,
the interface registers are first set to control port write mode
(Line 1), which is followed by 18 no operation (no op) bytes
(Line 2 to Line 4) so that the interface register data appears on
Page 2 of the EEPROM. Next, follows the write header (Line 4)
and then 32 bytes of interface register data (Line 5 to Line 8).
Finally, the program RAM data, starting at Address 0x04, 0x00 is
written (Line 9 to Line 11). In this example, the program length
is 70 words, or 350 bytes; therefore, 332 additional bytes are
included in the EEPROM but are not shown in Figure 28.
Writeback
A writeback occurs when the WB pin is triggered and data is
written to the EEPROM from the ADAU1702. This function is
typically used to save the volume setting and other parameter
settings to the EEPROM immediately prior to power being
removed from the system. A rising edge on the WB pin triggers
a writeback when the device is in self-boot mode, unless a message
to set the WB to the falling edge sensitive (0x05) is contained in
the self-boot message sequence. Only one writeback takes place
unless a message to set multiple writebacks (0x04) is contained
in the self-boot message sequence. The WP pin is pulled low
when a writeback is triggered to allow writing to the EEPROM.
The ADAU1702 is only capable of writing back the contents of
the interface registers to the EEPROM. These registers are usually
set by the DSP program, but can also be written to directly after
setting Bit 6 of the core control register. The parameter settings
that the user wants to save are configured in SigmaStudio.
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