sta335bwqs STMicroelectronics, sta335bwqs Datasheet - Page 21

• Manufacturer Part Number: sta335bwqs
• Description: 2.1-channel High-efficiency Digital Audio System With Qsound Qhd?
• Manufacturer: STMicroelectronics

STA335BWQS
5
5.1
5.1.1
5.1.2
Note:
Functional description
Functional pin status
Table 8.
Power-down function
Pin PWRDN (23) is used to power down the STA335BWQS.
PWRDN = 0 (GND) → Power down
PWRND = 1 (VDD) → Normal operation
During the power-down sequence the output begins a gradual (soft) mute. After the mute
condition is reached the power stage is switched off (Hi-Z) then the master clock to all
internal hardware blocks is gated. The PLL is also switched off. The power-down sequence
takes 13 million cycles.
Reset function
Pin RESET (31) is used to reset the STA335BWQS.
RESET = 0 (GND) → Reset state
RESET = 1 (VDD) → Normal operation
When pin RESET is forced to 0 the power stage is switched off (Hi-Z) and the master clock
to all internal hardware blocks is gated.
RESET condition takes priority over PWRDN condition.
RESET
RESET
PWRDN
PWRDN
TWARN
TWARN
EAPD
EAPD
Pin name
31
31
23
23
20
20
19
19
Functional pin status
Pin #
Logic value
0
1
0
1
0
1
0
1
Reset state:
Power stage is switched off
All the registers are set to default value
Normal operation
Low power mode:
Power stage is switched off then the PLL is switched off
(this operation take 13 million clock cycles)
Normal operation
Temperature warning indication from external power stage
Normal operation
Low power mode for power stage:
All internal regulators are switched off
Normal operation
IC status
Functional description
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