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TEA5762H 数据表(PDF) 8 Page - NXP Semiconductors

部件名 TEA5762H
功能描述  Self Tuned Radio STR
Download  32 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

TEA5762H 数据表(HTML) 8 Page - NXP Semiconductors

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1999 Aug 04
8
Philips Semiconductors
Product specification
Self Tuned Radio (STR)
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
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.
BUS-CLOCK
MO/ST (PIN 24)
RESULT
LOW
LOW
stereo
LOW
HIGH
mono
HIGH
LOW
tuned
HIGH
HIGH
not tuned
Table 3
Explanation of the shift register bits
BIT
DESCRIPTION
LOGIC
STATE
RESULT
S.24 (MSB)
search start/end
0
after a search when a station is found or after a preset
1
during the search action
D.23
search up/down
0
indicates if the radio has to search down
1
indicates if the radio has to search up
M.22
mono/stereo
0
stereo is allowed
1
mono is required (radio switched to forced mono)
B0.21
band
see Table 4
selects FM/MW/LW/SW band
B1.20
band
see Table 4
selects FM/MW/LW/SW band
P0.19
port
note 1
user programmable bits which e.g. can be used as band
switch driver
P1.18
port
note 1
user programmable bits which e.g. can be used as band
switch driver
S0.17
search-level of station
see Table 5
determines the locking field strength during an
automatic search, automatic store or manual search
S1.16
search-level of station
see Table 5
determines the locking field strength during an
automatic search, automatic store or manual search
15
dummy
buffer
F.14 to F.0 (LSB)
frequency
determine the tuning frequency of the radio; see Table 6
for the bit values


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