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
D
Equalizer enable and configuration
Y
D
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
