sta381bw STMicroelectronics, sta381bw Datasheet - Page 106

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

Register description: Sound Terminal compatibility
7.1.2
7.1.3
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Interpolation ratio select
Table 102. Internal interpolation ratio
The STA381BW has variable interpolation (oversampling) settings such that internal
processing and FFX output rates remain consistent. The first processing block interpolates
by either 3-times (see
downsample. The oversampling ratio of this interpolation is determined by the IR bits.
Table 103. IR bit settings as a function of input sample rate
Fault-detect recovery bypass
Table 104. Fault-detect recovery bypass
The on-chip STA381BW power output block provides feedback to the digital controller using
inputs to the power control block. The FAULT input is used to indicate a fault condition (either
overcurrent or thermal). When FAULT is asserted (set to 0), the power control block attempts
a recovery from the fault by asserting the tri-state output (setting it to 0 which directs the
power output block to begin recovery), holds it at 0 for period of time in the range of 0.1 ms
to 1 second as defined by the fault-detect recovery constant register (FDRC registers 0x2B-
0x2C), then toggles it back to 1. This sequence is repeated as long as the fault indication
exists. This feature is enabled by default, but can be bypassed by setting the FDRB control
bit to 1.
Bit
Bit
4:3
7
Input sample rate fs (kHz)
R/W
R/W
R/W
R/W
176.4
44.1
88.2
192
32
48
96
RST
RST
0
00
Section
IR [1:0]
Name
Doc ID 018835 Rev 2
Name
FDRB
4.2), 2-times or 1-time (pass-through) or provides a 2-times
00
00
00
01
01
10
10
IR
Selects internal interpolation ratio based on input I
sample frequency
0: fault-detect recovery enabled
1: fault-detect recovery disabled
1st stage interpolation ratio
2 times downsampling
2 times downsampling
2 times oversampling
2 times oversampling
2 times oversampling
Description
Pass-through
Pass-through
Description
STA381BW
2
S