TEA5757H Ver la hoja de datos (PDF) - Philips Electronics
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TEA5757H Datasheet PDF : 32 Pages
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Philips Semiconductors
Self Tuned Radio (STR)
Product specification
TEA5757; TEA5759
Description of the bus
The TEA5757; TEA5759 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 TEA5757; TEA5759 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)
DESCRIPTION
search start/end
D.23
search up/down
M.22
mono/stereo
B0.21
B1.20
P0.19
P1.18
S0.17
S1.16
15
F.14 to F.0 (LSB)
band
port
search-level of station
dummy
frequency
LOGIC
STATE
RESULT
0
after a search when a station is found or after a preset
1
during the search action
0
indicates if the radio has to search down
1
indicates if the radio has to search up
0
stereo is allowed
1
mono is required (radio switched to forced mono)
see Table 4 selects FM/MW/LW/SW band
note 1
user programmable bits which e.g. can be used as band
switch driver
see Table 5 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
Note
1. The output pins 30 and 31 can drive currents up to 5 mA; bits P0.19 and P1.18 control the output voltage of the
control pins P0 (pin 30) and P1 (pin 31):
a) Bit P0.19 LOW sets P0 (pin 30) to LOW.
b) Bit P0.19 HIGH sets P0 (pin 30) to HIGH.
c) Bit P1.18 LOW sets P1 (pin 31) to LOW.
d) Bit P1.18 HIGH sets P1 (pin 31) to HIGH.
1999 Aug 26
8
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