sta339bw STMicroelectronics, sta339bw Datasheet - Page 34

• Manufacturer Part Number: sta339bw
• Description: 2.1-channel High-efficiency Digital Audio System
• Manufacturer: STMicroelectronics

Register description
6.3.3
6.4
6.4.1
6.4.2
6.4.3
34/77
Over-current warning detect adjustment bypass
Table 27.
The OCWARN input is used to indicate an over-current warning condition. When OCWARN
is asserted (set to 0), the power control block forces an adjustment to the modulation limit
(default is -3 dB) in an attempt to eliminate the over-current warning condition. Once the
over-current warning volume adjustment is applied, it remains in this state until reset is
applied. The level of adjustment can be changed via the TWOCL (thermal warning /
overcurrent limit) setting which is address 0x37 of the user defined coefficient RAM.
Configuration register D (addr 0x03)
High-pass filter bypass
Table 28.
The STA339BW features an internal digital high-pass filter for the purpose of AC coupling.
The purpose of this filter is to prevent DC signals from passing through a FFX amplifier. DC
signals can cause speaker damage. When HPB = 0, this filter is enabled.
De-emphasis
Table 29.
DSP bypass
Table 30.
Setting the DSPB bit bypasses the EQ function of the STA339BW.
7
0
1
2
Bit
Bit
Bit
Bit
SME
D7
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Over-current warning bypass
High-pass filter bypass
De-emphasis
DSP bypass
ZDE
D6
1
1
0
0
0
RST
RST
RST
RST
OCRB
HPB
DEMP
DSPB
DRC
D5
0
Doc ID 15251 Rev 4
Name
Name
Name
Name
BQL
D4
0
0: Over-current warning adjustment enabled
1: Over-current warning adjustment disabled
Setting of one bypasses internal AC coupling digital
high-pass filter
0: No de-emphasis
1: Enable de-emphasis on all channels
0: Normal operation
1: Bypass of biquad and bass/treble functions
PSL
D3
0
DSPB
Description
Description
Description
Description
D2
0
DEMP
D1
0
STA339BW
HPB
D0
0