Datasheet

TEF6901A_3 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 03 — 20 March 2008 18 of 107
NXP Semiconductors
TEF6901A
Integrated car radio
8.1.4 Read mode: data byte MOD
Table 13. MOD - format of data byte 3
7 6 5 4 3 2 1 0
MOD4 MOD3 MOD2 MOD1 MOD0 STIN TAS1 TAS0
Table 14. MOD - data byte 3 bit description
Bit Symbol Description
7 to 3 MOD[4:0] modulation detector; this value indicates the audio modulation; see
Table 15
FM between 0 kHz and 150 kHz FM deviation
AM between 0 % and 200 % modulation
FM offset detector; a read value of 31 indicates offset detection. The
offset detector is part of the FM bandwidth control algorithm and detects
adjacent channel breakthrough.
VU-meter; when an external audio source is selected and VU-meter read
is active (see subaddress 17h; see
Table 97) MOD indicates the audio
input level (RMS) between 0 V and 2 V; see
Table 15.
2 STIN stereo indicator; this bit indicates if a stereo pilot signal has been
detected
0 = no pilot signal detected
1 = pilot signal is detected and the FM stereo decoder is activated
1 and 0 TAS[1:0] Tuning action state; state machine information. The signal TAS informs
about internal control functions of the tuner action state machine. This
way the progress of tuner actions can be monitored by the
microcontroller.
00 = inactive
01 = starting mute
10 = PLL tuning
11 = tuning ready with mute active
Table 15. MOD detector
MOD4 MOD3 MOD2 MOD1 MOD0 FM radio ∆f AM radio m VU External source
0 0 0 0 0 < 1.5 kHz < 2 % - < 0.02 V
0 0 0 0 1 1.5 kHz 2 % −34 dB 0.02 V
000103 kHz 4% −28 dB 0.04 V
0 0 0 1 1 4.5 kHz 6 % −24 dB 0.06 V
001006 kHz 8% −22 dB 0.08 V
0 0 1 0 1 7.5 kHz 10 % −20 dB 0.1 V
0 0 1 1 0 9.5 kHz 13 % −18 dB 0.13 V
0 0 1 1 1 12 kHz 16 % −16 dB 0.16 V
0 1 0 0 0 15 kHz 20 % −14 dB 0.2 V
0 1 0 0 1 19 kHz 25 % −12 dB 0.25 V
0 1 0 1 0 24 kHz 32 % −10 dB 0.32 V
0 1 0 1 1 30 kHz 40 % −8 dB 0.4 V
0 1 1 0 0 38 kHz 50 % −6 dB 0.5 V