Tfa9812, Nxp semiconductors – NXP Semiconductors TFA9812 User Manual
Page 38
TFA9812_2
© NXP B.V. 2009. All rights reserved.
Preliminary data sheet
Rev. 02 — 22 January 2009
38 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplifier with I
2
S input
[1]
The diagnostic pin 30 DIAG is flagged when several protection mechanisms have been active, see
9.6 Overview of functional control in each control mode
shows the control level supported by either I
2
C or Legacy control mode for all
functions described in
. It summarizes the information provided in the detailed
description of each function.
3
UVP3V3
Undervoltage detector for pins 3 and 40:
0 = No UVP has been detected
1 = A UVP has been detected since the last read-out of
the register
2
DIAG
Diagnostic pin flagging status
:
0 = Diagnostic pin has not been flagged low
1 = Diagnostic pin has been flagged low since the last
read-out of the register
1
LP
PLL lock protection indicator:
0 = PLL is in locked status
1 = PLL is not in locked status
0
MUTE
Soft mute status:
0 = No soft-mute or soft mute/demute in progress
1 = Audio signal muted as result of a soft mute
Table 50.
Bit description of register 30h: miscellaneous status
…continued
Bit
Symbol
Description
Table 51.
Functional control support in I
2
C and Legacy control modes
D = fixed control setting, determined by default I
2
C register setting; N = not supported; Y = fully
supported (i.e. all options implemented in the TFA9812).
Control function
Reference
I
2
C mode
Legacy mode
I
2
C register content
Y
N/D
Sleep mode enable
Y
Y
Operating mode enable
Y
Y
3-state mode enable
Y
Y
Master/Slave I
2
S
Y
Y
MCLK/BCK master input clock selection
Auto
Auto
Digital audio input format selection
Y
Subset
Selection f
s
= 8 kHz to192 kHz
Y
Equalizer enable and configuration
Y
Detailed equalizer settings
Y
N
Digital volume control per channel
Y
N
Analog volume control (shared for two channels)
N
Y
De-emphasis for subset of allowed f
s
Y
N
Soft mute
Y
Y
Hard mute
Y
N
Polarity switch enable
Y
N
+24 dB gain boost
Y
Y