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ICL8052ACPD Datasheet(PDF) 16 Page - Intersil Corporation |
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ICL8052ACPD Datasheet(HTML) 16 Page - Intersil Corporation |
16 / 19 page 3-49 Interfacing with UARTs and Microprocessors Figure 15 shows a very simple interface between a free-run- ning 8068/8052/71C03A 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 using it to drive the Even Parity Enable Pin (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 the Digit 5 word - as in the UART circuits. In each case the microprocessor can instruct the A/D when to begin a mea- surement and when to hold this measurement. Application Notes 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 NOTE # DESCRIPTION AnswerFAX DOC. # AN016 “Selecting A/D Converters” 9016 AN017 “The Integrating A/D Converter” 9017 AN018 “Do’s and Don’ts of Applying A/D Converters” 9018 AN023 “Low Cost Digital Panel Meter Designs” 9023 AN028 “Build an Auto-Ranging DMM Using the 8052A / 7103A A/D Converter Pair,” by Larry Goff 9028 ICL8052/ICL71C03, ICL8068/ICL71C03 |
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