Datasheet

TEF6901A_3 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 03 — 20 March 2008 44 of 107
NXP Semiconductors
TEF6901A
Integrated car radio
8.2.13 Write mode: data byte TIMING
[1] During the tuning mute of the preset and search mode tuning action the time constants set by STC, HTC
and MTC change to t
attack
=50msandt
recovery
= 50 ms to enable fast settling of the weak signal processing
to new conditions.
[1] When for an external audio source VU-meter mode is enabled (bits AVUM or COMP are logic 1) the HTC
setting controls the t
recovery
VU-meter timing, t
attack
has a fixed value of 20 ms; see Table 99.
Table 52. TIMING - format of data byte 0Bh with default setting
7 6 5 4 3 2 1 0
STC1 STC0 HTC2 HTC1 HTC0 MTC2 MTC1 MTC0
10100110
Table 53. TIMING - data byte 0Bh bit description
[1]
Bit Symbol Description
7 and 6 STC[1:0] setting of the stereo noise control time constants; see
Table 54
5 to 3 HTC[2:0] setting of the high cut control time constants; see
Table 55
2 to 0 MTC[2:0] setting of the soft mute control time constants; see
Table 56
Table 54. SNC weak signal processing control speed setting
STC1 STC0 t
attack
t
recovery
0 0 0.1 s 1.25 s
0 1 0.1 s 2.5 s
1 0 0.1 s 5 s
1 1 0.1 s 10 s
Table 55. HCC speed setting
[1]
HTC2 HTC1 HTC0 t
attack
t
recovery
0 0 0 0.03 s 0.04 s
0 0 1 0.03 s 0.08 s
0 1 0 0.06 s 0.3 s
0 1 1 0.25 s 0.3 s
1 0 0 0.25 s 0.6 s
1 0 1 0.5 s 0.6 s
1101 s1.25 s
1111 s2.5 s