sta381bw STMicroelectronics, sta381bw Datasheet - Page 151

• Manufacturer Part Number: sta381bw
• Description: Sound Terminal 2.1-channel High-efficiency Digital Audio System
• Manufacturer: STMicroelectronics

STA381BW
7.22.3
7.22.4
works only for hardware PWDN assertion and not for a power-down applied through the IIC
interface. Refer to
needed.
Channel PWM enable (CPWMEN) bit (address 0x4B, bit D2)
This bit, when set, activates a mute output in case the volume reaches a value lower
than -76dBFS.
External amplifier hardware pin enabler (LPDP, LPD LPDE) bits
(address 0x4C, bit D7, D6, D5)
Pin 32 (INTLINE), normally indicating a fault condition, using the following 3 register
settings, can be reconfigured as hardware pin enabler for an external headphone or line
amplifier.
In particular the LPDE bit, when set, activates this function. Accordingly, the LPD value (0 or
1) is exported on pin 32 and in case of power-down assertion, pin 32 is tied to LPDP.
The LPDP bit, when set, negates the value programmed as the LPD value, refer to the
following table.
Table 170. External amplifier enabler configuration bits
Figure 43. Alternate function for INTLINE pin
“is the d evice in p ow erd o w n ?”
LPDP
x
0
0
1
1
Section 6.30.5
LPD
‘0 ’
LPD]
0
1
0
1
x
Doc ID 018835 Rev 2
Y
N
if programming a different number of clock cycles is
Register description: Sound Terminal compatibility
Po w er B rid ge Fau lt
LPDE
0
1
1
1
1
LP D P
0
1
LPD E
Pin 32 output
INT_LINE
0
1
0
1
1
0
IN T L IN E
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