TEA5762H Просмотр технического описания (PDF) - Philips Electronics
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TEA5762H Datasheet PDF : 32 Pages
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Philips Semiconductors
Self Tuned Radio (STR)
Product specification
TEA5762
To ensure that the search function operates correctly
under all conditions the following search sequence must
be applied:
• Store the current frequency in the memory
• Issue the search command
• Wait for data valid and read the new frequency
• If the new frequency is the same as the stored
frequency, issue a pre-set step (e.g. 50 kHz) and start
the search sequence again.
Description of the bus
The TEA5762 radio has a bus which consists of three
wires, as shown in Table 1.
Table 1 Bus signals
SIGNAL
DESCRIPTION
PIN
BUS-CLOCK
software driven clock input 27
DATA
data input/output
28
WRITE-ENABLE write/read-input
29
These three signals, together with the mono/stereo pin
(MO/ST; pin 24), communicate with the microcontroller.
The mono/stereo indicator has two functions, which are
controlled by the BUS-CLOCK, as shown in Table 2.
Table 2 Bus-clock functions
BUS-CLOCK
LOW
LOW
HIGH
HIGH
MO/ST (PIN 24)
RESULT
LOW
stereo
HIGH
mono
LOW
tuned
HIGH
not tuned
The TEA5762 has a 25-bit shift register; see Table 3 for an
explanation of the shift register bits.
If in search mode no transmitter can be found, all
frequency bits of the shift register are set to logic 0.
The bus protocol is depicted in Figs 3 and 4.
Table 3 Explanation of the shift register bits
BIT
S.24 (MSB)
D.23
M.22
B0.21
B1.20
P0.19
DESCRIPTION
search start/end
search up/down
mono/stereo
band
band
port
LOGIC
STATE
0
1
0
1
0
1
see Table 4
see Table 4
note 1
P1.18
port
note 1
S0.17
search-level of station see Table 5
S1.16
search-level of station see Table 5
15
dummy
−
F.14 to F.0 (LSB) frequency
−
RESULT
after a search when a station is found or after a preset
during the search action
indicates if the radio has to search down
indicates if the radio has to search up
stereo is allowed
mono is required (radio switched to forced mono)
selects FM/MW/LW/SW band
selects FM/MW/LW/SW band
user programmable bits which e.g. can be used as band
switch driver
user programmable bits which e.g. can be used as band
switch driver
determines the locking field strength during an
automatic search, automatic store or manual search
determines the locking field strength during an
automatic search, automatic store or manual search
buffer
determine the tuning frequency of the radio; see Table 6
for the bit values
1999 Aug 04
8
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