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TEA5762H Datasheet(PDF) 8 Page - NXP Semiconductors |
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TEA5762H Datasheet(HTML) 8 Page - NXP Semiconductors |
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8 / 32 page  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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