参数资料
型号: TAS3004PFBRG4
厂商: TEXAS INSTRUMENTS INC
元件分类: 消费家电
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP48
封装: GREEN, PLASTIC, TQFP-48
文件页数: 39/84页
文件大小: 671K
代理商: TAS3004PFBRG4
6–5
6.4.3
Wait States
If separate I2C/SMBus commands are sent too frequently, the TAS3004 device can generate a bus wait state. This
happens when the device is busy while performing smoothing operations and changing volume, bass, and treble.
The wait occurs after the bus acknowledge on the first data byte and can exceed the maximum allowable time allowed
according to the SMBus specification (worst case 200 ms).
The following is a possible bus wait state scenario:
CODE
Start
68
84
06
01
00
01
00
Stop
ACTUAL
Start
68
84
06
01
Wait
00
01
00
Stop
If the master does not recognize bus waiting or if the master times out on a long wait, the master must not send consecutive I2C/SMBus commands
without a time interval of 200 ms between transactions.
6.4.4
TAS3004 SMBus Readback
The TAS3004 device supports a subset of SMBus readback. When an SMBus read command is sent to the device
(LSB = high), it answers with the subaddress and the last six bytes written.
SMBus
Command
Byte
Count
SENT
Start
69h
xxh
07h
Stop
RECEIVED
Start
07h
aah
ddh
Stop
Byte
Count
Where:
xxh
= Command byte, it is a don’t care because the response contains only the subaddress and the
last six bytes of data written to the TAS3004 device
aah
= The last subaddress accessed in the device
ddh
= Data bytes from the TAS3004 device
NOTE: Use read sequence defined in 6.3.2
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