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参数资料
| 型号： | TAS5508PAGR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 47/105页 |
| 文件大小： | 1286K |
| 代理商： | TAS5508PAGR |
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3.2.3
Back-End Error (BKND_ERR)
3.2.4
Speaker/Headphone Selector (HP_SEL)
3.2.5
Mute (MUTE)
TAS5508
8-Channel Digital Audio PWM Processor
SLES091D – FEBRUARY 2004 – REVISED JULY 2009
www.ti.com
Back-end error is used to provide error management for back-end error conditions. Back-end error is a
level-sensitive signal. Back-end error can be initiated by bringing the BKND_ERR terminal low for a
minimum 5 MCLK cycles. When BKND_ERR is brought low, the PWM sets either six or eight channels
into the PWM back-end error state. This state is described in Section 2.12. Once the back-end error
sequence is initiated, a delay of 5 ms is performed before the system starts the output re-initialization
sequence. After the initialization time, the TAS5508 begins normal operation. Back-end error does not
affect other PWM modulator operations.
The number of channels that are affected by the BKND_ERR signal depends on the 6-channel
configuration signal. If the I2C setting 6-channel configuration is false, the TAS5508 places all eight PWM
outputs in the PWM back-end error state, while not affecting any other internal settings or operations. If
the I2Csetting six configuration is true, the TAS5508 brings the PWM outputs 1–6 to a back-end error
state, while not affecting any other internal settings or operations. Table 3-4 shows the device output
signal states during back-end error.
Table 3-4. Device Outputs During Back-End Error
SIGNAL
SIGNAL STATE
Valid
Low
PWM P-outputs
M-state – low
PWM M-outputs
M-state – low
HPPWM P-outputs
M-state – low
HPPWM M-outputs
M-state – low
SDA
Signal input (not driven)
The HP_SEL terminal enables the headphone output or the speaker outputs. The headphone output
receives the processed data output from DAP and PWM channels 1 and 2.
In 6-channel configuration, this feature does not affect the two lineout channels.
When low, the headphone output is enabled. In this mode, the speaker outputs are disabled. When high,
the speaker outputs are enabled and the headphone is disabled.
Changes in the pin logic level result in a state change sequence using soft mute to the hard mute (M)
state for both speaker and headphone followed by a soft unmute.
When HP_SEL is low, the configuration of channels 1 and 2 is defined by the headphone configuration
register. When HP_SEL is high, the channel-1 and -2 configuration registers define the configuration of
channels 1 and 2.
The mute control provides a noiseless volume ramp to silence. Releasing mute provides a noiseless ramp
to previous volume. The TAS5508 has both master and individual channel mute commands. A terminal is
also provided for the master mute. The active-low master mute I2C register and the MUTE terminal are
logically ORed together. If either is set to low, a mute on all channels is performed. The master mute
command operates on all channels regardless of whether the system is in the 6- or 8-channel
configuration.
When MUTE is invoked, the PWM output stops switching and then goes to an idle state.
TAS5508 Controls and Status
46
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