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參數(shù)資料
| 型號： | TLV320AIC27IPFB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 25/54頁 |
| 文件大小： | 732K |
| 代理商： | TLV320AIC27IPFB |
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TLV320AIC27
STEREO AUDIO CODEC
SLAS253A – MARCH 2000 – REVISED SEPTEMBER 2000
31
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
power-down control/status register (index 26h) (continued)
PR0 = 1
PR1 = 1
PR2 = 1
PR4 = 1
PR0 = 0 AND
ADC = 1
DEFAULT
READY = 1
COLD RESET
WARM
RESET
PR2 = 0 AND
ANL = 1
PR1 = 0 AND
DAC = 1
ADCs OFF
PR0
DACs OFF
PR1
ANALOGUE
OFF PR2 OR
PR3
DIGITAL I/F
OFF PR4
SHUT OFF
CODA LINK
NORMAL
Figure 13. An Example of the TLV320AIC27 Power-Down/Power-Up Flow
Figure 13 illustrates one example of a procedure to perform a complete power down of the TLV320AIC27. From
normal operation, sequential writes to the power-down register are performed to power down the TLV320AIC27
one piece at a time. After everything has been shut off (PR0 to PR3 set), a final write (of PR4) can be executed
to shut down the TLV320AIC27’s digital interface (ac link).
The part remains in sleep mode with all its registers holding their static values. To wake up the TLV320AIC27,
the AC’97 controller sends a pulse on the sync line issuing a warm reset. This restarts the TLV320AIC27’s digital
interface (resetting PR4 to 0). The TLV320AIC27 can also be woken up with a cold reset. A cold reset causes
a loss of values to the registers, as it sets them to their default states. When a section is powered back on, the
power-down control/status register index 26h should be read to verify that the section is ready (that is, stable)
before attempting any operation that requires it.
Alternatively, if RESETB is held low, all PR bits are held set so the device stays powered off until RESETB is
taken high again.
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