TEF6901A_3 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 03 — 20 March 2008 58 of 107
NXP Semiconductors
TEF6901A
Integrated car radio
[1] M−, L− and R− indicate inverted polarity of audio signal.
8.2.19 Write mode: data byte VOLUME
[1] Dynamic compression can be used with external sources only. When dynamic compression is active, the radio quality detection of USN,
MOD and offset is limited to AF update tuning only. For dynamic compression the bits MOD[4:0] indicate the external source input
amplitude as in the VU-meter mode; AVUM; data byte 17h (see Table 97). The FM dynamic bandwidth control is disabled and a fixed
bandwidth of 113 kHz is defined. However, other fixed bandwidth settings are available by DYN = 0 and the setting of BW; data byte 0h
(see Table 28). The compression recovery timing is controlled by data byte 0Bh; TIMING (see Table 80). Compression start and slope
are controlled by data byte 0Eh; SOFTMUTE (see Table 81 and Table 82). Standard compression requires a setting of MST = 7 and
MSL = 1.
Table 77. Input select pin use and suggested combinations of input sources
[1]
INP[3:0] Input pin use Audio source Source combinations
INAL INAR INAC INBL INBR INC IND
0000 radio x x x x x x x x x
0001 L R GND stereo CMR x x x x x
0010 L R stereo x x x x x x
0011 M− M+ mono symmetrical x x
0100 L− R− stereo x x
0101 M− mono x x
0110 M mono x x x
0111 L R GND stereo CMR x
1000 L+ R+ L− R− stereo symmetrical x x
1001 L R stereo x x x x
1010 M− mono x x x x
Table 78. VOLUME - format of data byte 11h with default setting
7 6 5 4 3 2 1 0
COMP VOL6 VOL5 VOL4 VOL3 VOL2 VOL1 VOL0
00110000
Table 79. VOLUME - data byte 11h bit description
Bit Symbol Description
7 COMP dynamic compression
[1]
; see Figure 36
0 = compression is disabled (standard use)
1 = dynamic compression is enabled
6 to 0 VOL[6:0] volume setting (see
Table 83); for balance control see data byte 16h (see Table 94), for
loudness control see data byte 17h (see
Table 97)
