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参数资料
| 型号： | TAS5036PFCR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封装： | PLASTIC, TQFP-80 |
| 文件页数： | 13/49页 |
| 文件大小： | 716K |
| 代理商： | TAS5036PFCR |
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Architecture Overview
15
SLES044B—November 2002
TAS5036
2.2
Reset, Power Down, and Status
The reset, power down, and status circuitry provides the necessary controls to bring the TAS5036 to the initial
inactive condition, achieve low power standby, and report system status.
2.2.1 Reset—RESET
The TAS5036 is placed in the reset mode by setting the RESET terminal low.
RESET is an asynchronous control signal that restores the TAS5036 to its default conditions, sets the valid
1–6 outputs low, and places the PWM in the hard mute state. Volume is immediately set to full attenuation
(there is no ramp down).
As long as the RESET terminal is held low, the device is in the reset state. During reset, all I2C and serial data
bus operations are ignored. Table 2–6 shows the device output signals while RESET is active.
Upon the release of RESET, if POWER_DWN is high, the system performs a 4-ms to 5-ms device initialization
and then ramps the volume up to 0 db using a soft volume update sequence. If MCLK_IN is not active when
RESET is released high, then a 4-ms to 5-ms initialization sequence is produced once MCLK_IN becomes
active.
During device initialization all controls are reset to their initial states. Table 2–7 shows the control settings that
are changed during initialization.
RESET should be applied during power-up initialization or while changing the master slave clock states.
Table 2–6. Device Outputs During Reset
SIGNAL
MODE
SIGNAL STATE
Valid 1–Valid 6
All
Low
PWM P-outputs
All
Low
PWM M-outputs
All
Low
MCLKOUT
All
Low
SCLK
Master
Low
SCLK
Slave
Signal input
LRCLK
Master
Low
LRCLK
Slave
Signal input
SDA
All
Signal input
CLIP
All
High
Because the RESET is an asynchronous control signal, small clicks and pops can be produced during the
application (the leading edge) of this control. However, when RESET is released, the transition from the hard
mute state back to normal operation is performed synchronously using a quiet sequence.
If a completely quiet reset sequence is desired, MUTE should be applied before applying RESET.
Table 2–7. Values Set During Reset
CONTROL
SETTING
Volume
0 dB
MCLK_IN frequency
256
Master/slave mode
M_S terminal state
Auto mute
Enabled
De-emphasis
None
DC offset
0
Interchannel delay
Each channel set at 16 clocks higher then preceding channel
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