TDA7541 Datasheet, PDF (55/76 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system

TDA7541
Software specification
Table 26. Addr 10 Quality MUX/FSU (FM 0Eh , AM 0Fh)
MSB
LSB
d7 d6 d5 d4 d3 d2 d1 d0
Function
MUX<1:0>
0 0 Detected multipath information at PIN 23
0 1 Detected adjacent channel information at PIN 23
1 0 Quality information stereo decoder at PIN 23
1 1 FMON=1: Stereo indication at PIN 23
FMON=0: AM IF2 signal at PIN 23
1
Not used
1
Not used
SSTH<7:4>
0
000
SSTOP = IFC (IF counter status)
0
001
SSTOP = H if IFC = H & FS > (FM: 0.6V / AM: 1.2V)
0
010
0
011
0
100
-
--
1
111
SSTOP = H if IFC = H & FS >
SSTOP = H if IFC = H & FS >
SSTOP = H if IFC = H & FS >
-
SSTOP = H if IFC = H & FS > (FM: 4.1V / AM: 4.8V)
Table 27. Addr 11 Weak Signal Mute (FM A8h)
MSB
LSB
d7 d6 d5 d4 d3 d2 d1 d0
Function
ISSON
0 ISS filter internal control
1 ISS filter forced “ON”
WBON
0
Weather band disable
1
Weather band enable
WMTH<4:2>
000
Startpoint mute 0
001
Startpoint mute 1
010
Startpoint mute 2
---
-
110
111
0 00
0 01
-
--
1 01
-
--
1 11
Startpoint mute 6
Startpoint mute 7
WMD<7:5>
Mute depth 0
Mute depth 1
-
Mute depth 5
-
Mute depth 7
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