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TEA5757H データシート(PDF) 8 Page - NXP Semiconductors |
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TEA5757H データシート(HTML) 8 Page - NXP Semiconductors |
8 / 32 page 1999 Aug 26 8 Philips Semiconductors Product specification Self Tuned Radio (STR) 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 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 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. SIGNAL DESCRIPTION PIN BUS-CLOCK software driven clock input 27 DATA data input/output 28 WRITE-ENABLE write/read input 29 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 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. 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 P0.19 port note 1 user programmable bits which e.g. can be used as band switch driver P1.18 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 15 dummy − buffer F.14 to F.0 (LSB) frequency − determine the tuning frequency of the radio; see Table 6 for the bit values |
同様の部品番号 - TEA5757H |
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同様の説明 - TEA5757H |
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