STA381BWS datasheet(110/174 Pages) STMICROELECTRONICS

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STA381BWS

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DocID018937 Rev 7

7.1.2

Interpolation ratio select

The STA381BWS 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 Section 4.2), 2 times or 1 time (pass-through) or provides a 2 times

downsample. The oversampling ratio of this interpolation is determined by the IR bits.

7.1.3

Fault-detect recovery bypass

The on-chip STA381BWS 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.

Table 103. Internal interpolation ratio

Bit

R/W

RST

Name

Description

4:3

R/W

IR [1:0]

Selects internal interpolation ratio based on input I2S

sampling frequency

Table 104. IR bit settings as a function of the input sampling rate

Input sampling rate fs (kHz)

1st stage interpolation ratio

2-times oversampling

44.1

2-times oversampling

88.2

Pass-through

176.4

2-times downsampling

192

2-times downsampling

Table 105. Fault-detect recovery bypass

Bit

R/W

RST

Name

Description

R/W

FDRB

0: fault-detect recovery enabled

1: fault-detect recovery disabled

Obsolete

Product(s)

- Obsolete

Product(s)

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