sta335bw STMicroelectronics, sta335bw Datasheet - Page 25

• Manufacturer Part Number: sta335bw
• Description: 2.1 Channels High Efficiency Digital Audio System
• Manufacturer: STMicroelectronics

STA335BW
5.3.3
5.4
5.4.1
5.4.2
5.4.3
Over-current warning detect adjustment bypass
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/over
current limit) setting which is address 0x37 of the user defined coefficient RAM.
Configuration register D (address 0x03)
High-pass filter bypass
The STA335BW 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 DDX amplifier. DC
signals can cause speaker damage. When HPB=0, this filter is enabled.
De-emphasis
Setting the DEMP bit enables de-emphasis on all channels
DSP bypass
Setting the DSPB bit bypasses the EQ functionality of the STA335BW.
Bit
Bit
Bit
Bit
7
0
1
2
MME
D7
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
ZDE
D6
1
RST
RST
RST
RST
1
0
0
0
DRC
D5
0
OCRB
DEMP
Name
Name
Name
Name
DSPB
HPB
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 – De-emphasis
0 – Normal operation
1 – Bypass of biquad and bass/treble functionality
PSL
D3
0
DSPB
D2
0
Description
Description
Description
Description
Register description
DEMP
D1
0
HPB
D0
0
25/54