參數(shù)資料
型號(hào)： TAS5508PAGRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 46/105頁(yè)
文件大?。?/td> 1286K
代理商： TAS5508PAGRG4
3.2.2
Power Down (PDN)
TAS5508
8-Channel Digital Audio PWM Processor
www.ti.com
SLES091D – FEBRUARY 2004 – REVISED JULY 2009
Table 3-2. Values Set During Reset (continued)
CONTROL
SETTING
Bass filter sets
Filter set 3
Loudness (5508)
Loudness disabled, default values
AM interference enable
Disabled
AM interference IF
455
AM interference select sequence
1
Tuned frequency and mode
0000, BCD
Subwoofer PSVC control
Enabled
PSVC and PSVC range
Disabled/0 dB
After the initialization time, the TAS5508 starts the transition to the operational state with the master
volume set at mute.
Because the TAS5508 has an external crystal time base, following the release of RESET, the TAS5508
sets the MCLK and data rates and performs the initialization sequences. The PWM outputs are held at a
mute state until the master volume is set to a value other than mute via I2C.
The TAS5508 can be placed into the power-down mode by holding the PDN terminal low. When the
power-down mode is entered, both the PLL and the oscillator are shut down. Volume is immediately set to
full attenuation (there is no ramp down). This control uses the PWM mute sequence that provides a low
click and pop transition to the hard mute state (M). A detailed description of the PWM mute sequence is
contained in the PWM section.
Power down is an asynchronous operation that does not require MCLK to go into the power-down state.
To initiate the power-up sequence requires MCLK to be operational and the TAS5508 to receive 5 MCLKs
prior to the release of PDN.
As long as the PDN terminal is held low, the device is in the power-down state with the PWM outputs in a
hard mute (M) state. During power down, all I2C and serial data bus operations are ignored. Table 3-3
shows the device output signals while PDN is active.
Table 3-3. Device Outputs During Power Down
SIGNAL
SIGNAL STATE
Valid
Low
PWM P-outputs
M-state = low
PWM M-outputs
M-state = low
SDA
Signal input
PSVC
M-state = low
Following the application of PDN, the TAS5508 does not perform a quiet shutdown to prevent clicks and
pops produced during the application (the leading edge) of this command. The application of PDN
immediately performs a PWM stop. A quiet stop sequence can be performed by first applying MUTE
before PDN.
When PDN is released, the system goes to the end state specified by MUTE and BKND_ERR pins and
the I2C register settings.
The crystal time base allows the TAS5508 to determine the CLK rates. Once these rates are determined,
the TAS5508 unmutes the audio.
TAS5508 Controls and Status
45
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