tea5761uk NXP Semiconductors, tea5761uk Datasheet - Page 11

• Manufacturer Part Number: tea5761uk
• Description: Tea5761uk Low-voltage Single Chip Fm-stereo Radio
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 13451
Product data sheet
8.20.2 Preset mode
The search algorithm can stop at a frequency that is offset from the IF by up to a
maximum of 12 kHz. The maximum offset can be limited to 8 kHz by applying a preset.
For optimum tuning, it is recommended that a preset is applied after a search and when
the found frequency has an offset that is above 8 kHz.
After this interrupt the TEA5761UK will not update the tuner registers INTREG, FRQCHK
and TUNCHK for a period of 15 ms. The state of the TEA5761UK can be checked by
reading registers INTREG, FRQCHK and TUNCHK.
these registers after an auto search.
A preset occurs by setting bit SM to logic 0 and writing a frequency to register FRQSET.
The tuner jumps to the selected frequency and sets bit FRRFLAG when it is ready.
After this interrupt the TEA5761UK will not update the tuner registers INTREG, FRQCHK
and TUNCHK for a period of 15 ms. The state of the TEA5761UK can be checked by
reading registers INTREG, FRQCHK and TUNCHK.
after a preset.
Table 5:
Bit
IFFLAG BLFLAG FRRFLAG
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
Tuner truth table
0
1
0
1
0
1
0
1
Rev. 01 — 2 August 2006
Comment
if pin INTX = LOW and bits IFMSK, LEVMSK, FRRMSK and
BLMSK were set, then this cannot occur
channel found during search; bits BLMSK and FRRMSK are set
not a valid combination
channel found and the band limit has been reached during a
search; bits BLMSK and FRRMSK are set
not possible during a preset or a search
a preset or search has been done and the wanted channel has
a valid RSSI level but the IF count fails; if bit AHLSI = 1, then bit
HLSI must be toggled and a new PLL value must be
programmed
not a valid combination
band limit is reached during search; no valid channel found
Low voltage single-chip FM stereo radio
Table 5
Table 5
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
shows the possible states of
shows the possible states
TEA5761UK
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