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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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LCL8052ACPD bảng dữ liệu(PDF) 17 Page - Intersil Corporation |
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LCL8052ACPD bảng dữ liệu(HTML) 17 Page - Intersil Corporation |
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17 / 23 page  17 Interfacing with UARTs and Microprocessors Figure 15 shows a very simple interface between a free- running 8068A/8052A/71C03A and a UART. The five STROBE pulses start the transmission of the five data words. The digit 5 word is 0000XXXX, digit 4 is 1000XXXX, digit 3 is 0100XXXX, etc. Also, the polarity is transmitted indirectly by usingit to drive theEvenParity EnablePin (EPE). If EPE of the receiver is held low, a parity flag at the receiver can be decoded as a positive signal, no flag as negative. A complex arrangement is shown in Figure 14. Here the UART can instruct the A/D to begin a measurement sequence by a word on RRI. The Busy signal resets the Data Ready Reset (DRR). Again STROBE starts the transmit sequence. A quad 2 input multiplexer is used to superimpose polarity, over-range, and under-range onto the D5 word since in this instance it is known that B2 =B4 =B8 =0. For correct operation it is important that the UART clock be fast enough that each word is transmitted before the next STROBE pulse arrives. Parity is locked into the UART at load time but does not change in this connection during an output stream. Circuits to interface the 71C03(A) directly with three popular microprocessors are shown in Figures 17, 18 and 19. The main differences in the circuits are that the IM6100 with its 12-bit word capability can accept polarity, over-range, under- range, 4 bits of BCD and 5 digits simultaneously where the 8080/8048 and the MC6800 groups with 8-bit words need to have polarity, over-range and under-range multiplexed onto theDigit 5word- as in theUARTcircuits. In eachcasethe microprocessor can instruct the A/D when to begin a measurement and when to hold this measurement. FIGURE 12. CMOS OSCILLATOR FIGURE 13. LM311 OSCILLATOR FIGURE 14. GROSS OVERVOLTAGE PROTECTION CIRCUIT R 37.5k Ω fOSC = 0.45/RC C 100pF LM311 - + 1 4 3 2 7 8 56k Ω 1k Ω 30k Ω 16k Ω 16k Ω 390pF +5V 0.22 µF A2 + - A3 + - INTEG. COMP. A1 + - BUFFER 14 11 9 INT OUT -INT IN BUF OUT 10 -BUF IN -1.2V 2 1 -15V 7 8 +15V 12 +INT IN 13 8052A/ INT. REF. 6 3 +BUF IN 5 REF OUT 300pF COMP OUT 100K 0.22 µF 2N5458 2N5461 S D S D 8068A REF COMP TO ICL71C03 Application Notes NOTE # DESCRIPTION AN016 “Selecting A/D Converters” AN017 “The Integrating A/D Converter” AN018 “Do’s and Don’ts of Applying A/D Converters” AN023 “Low Cost Digital Panel Meter Designs” AN028 “Build an Auto-Ranging DMM Using the 8052A / 7103A A/D Converter Pair,” by Larry Goff ICL8052A/ICL71C03, ICL8068A/ICL71C03 |
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