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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
Section 8.7.
9.6 Overview of functional control in each control mode
Table 51 shows the control level supported by either I
2
C or Legacy control mode for all
functions described in Section 9. 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
[1]
:
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 Section 9 Y N/D
Sleep mode enable
Section 8.2.2 YY
Operating mode enable
Section 8.2.2 YY
3-state mode enable
Section 8.2.2 YY
Master/Slave I
2
S Section 8.2.3 YY
MCLK/BCK master input clock selection
Section 8.2.3 Auto Auto
Digital audio input format selection
Section 8.4 Y Subset
Selection f
s
= 8 kHz to192 kHz Section 8.4.1 YD
[1]
Equalizer enable and configuration Section 8.5.1 YD
[2]
Detailed equalizer settings Section 8.5.1 YN
Digital volume control per channel
Section 8.5.2 YN
Analog volume control (shared for two channels)
Section 8.5.3 NY
De-emphasis for subset of allowed f
s
Section 8.5.3 YN
Soft mute
Section 8.5.3 YY
[3]
Hard mute Section 8.5.3 YN
Polarity switch enable
Section 8.5.4 YN
+24 dB gain boost
Section 8.5.6 YY