TEA5762H/V1,557 NXP Semiconductors, TEA5762H/V1,557 Datasheet - Page 9

• Manufacturer Part Number: TEA5762H/V1,557
• Description: Tuners SELF TUNED RADIO
• Manufacturer: NXP Semiconductors

Specifications of TEA5762H/V1,557

• Mounting Style: SMD/SMT
• Package / Case: SOT-307
• Screening Level: Commercial
• Package Type: PQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935177220557 TEA5762HB

Philips Semiconductors
To ensure that the search function operates correctly
under all conditions the following search sequence must
be applied:
Description of the bus
The TEA5762 radio has a bus which consists of three
wires, as shown in Table 1.
Table 1 Bus signals
Table 3 Explanation of the shift register bits
1999 Aug 04
BUS-CLOCK
DATA
WRITE-ENABLE
S.24 (MSB)
D.23
M.22
B0.21
B1.20
P0.19
P1.18
S0.17
S1.16
15
F.14 to F.0 (LSB)
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.
Self Tuned Radio (STR)
SIGNAL
BIT
software driven clock input
data input/output
write/read-input
search start/end
search up/down
mono/stereo
band
band
port
port
search-level of station
search-level of station
dummy
frequency
DESCRIPTION
DESCRIPTION
0
1
0
1
0
1
see Table 4
see Table 4
note 1
note 1
see Table 5
see Table 5
LOGIC
STATE
PIN
27
28
29
8
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.
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
BUS-CLOCK
HIGH
HIGH
LOW
LOW
MO/ST (PIN 24)
RESULT
HIGH
HIGH
LOW
LOW
Product specification
stereo
mono
tuned
not tuned
TEA5762
RESULT