参数资料
型号: ADAU1702JSTZ
厂商: Analog Devices Inc
文件页数: 21/52页
文件大小: 0K
描述: IC AUDIO PROC 2ADC/4DAC 48-LQFP
标准包装: 1
系列: SigmaDSP®
类型: 音频处理器
应用: 车载,监视器,MP3
安装类型: 表面贴装
封装/外壳: 48-LQFP
供应商设备封装: 48-LQFP(7x7)
包装: 托盘
产品目录页面: 776 (CN2011-ZH PDF)
ADAU1702
Rev. C | Page 28 of 52
The writeback function writes data from the ADAU1702
interface registers to the second page of the self-boot EEPROM,
Address 32 to Address 63. Starting at EEPROM Address 26
(so that the interface register data begins at Address 32), the
EEPROM should be programmed with six bytes—the message
byte (0x01), two length bytes, the chip address (0x00), and the
two-byte subaddress for the interface registers (0x08 0x00).
There must be a message to the DSP core control register to
enable writing to the interface registers prior to the interface
register data in the EEPROM; store this in EEPROM Address 0.
No op messages (0x03) can be used in between messages to
ensure that these conditions are met.
The ADAU1702 writes to EEPROM Chip Address 0xA0. The
LSBs of the addresses of some EEPROMs are pin configurable; in
most cases, these pins should be tied low to set the address to 0xA0.
The maximum number of bytes that is written back from the
ADAU1702 is 35 (eight four-byte interface registers plus three
bytes of EEPROM-addressing overhead). With SCL running at
384 kHz, the writeback operation takes approximately 73 μs to
complete after being triggered. Ensure that sufficient power is
available to the system to allow enough time for a writeback to
complete, especially if the WB signal is triggered from a falling
decreasing power supply voltage.
Table 18. EEPROM Message Types
Message ID
Message Type
Following Bytes
0x00
End
None
0x01
Write
Two bytes indicating message length followed by appropriate
number of data bytes
0x02
Delay
Two bytes for delay
0x03
No operation executed
None
0x04
Set multiple writeback
None
0x05
Set WB to falling edge sensitive
None
0x06
End and wait for writeback
None
0x01
0x00
0x05
0x00
0x08
0x1C
0x00
0x40
WRITE
LENGTH
DEVICE
ADDRESS
CORE CONTROL REGISTER
ADDRESS
CORE CONTROL REGISTER
DATA
0x01
0x001
0x61
0x00
0x04
0x00
WRITE
LENGTH
DEVICE
ADDRESS
PROGRAM RAM ADDRESS
PROGRAM RAM DATA
0x00
0x01
0x00
0xE8
0x01
PROGRAM RAM DATA
0x00
0x01
0x00
0x08
0x00
PROGRAM RAM DATA (CONTINUES FOR 332 MORE BYTES)
0x00
INTERFACE REGISTER DATA
0x00
INTERFACE REGISTER DATA
0x00
INTERFACE REGISTER DATA
0x00
INTERFACE REGISTER DATA
0x03
NO-OP BYTES
0x03
NO-OP BYTES
0x03
0x01
0x00
0x23
0x00
0x08
0x00
LENGTH
DEVICE
ADDRESS
INTERFACE REGISTER
ADDRESS
WRITE
NO-OP BYTES
05
79
8-
0
39
Figure 28. EEPROM Data Example
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