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LCL8068ACJD Datasheet(PDF) 9 Page - Intersil Corporation |
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LCL8068ACJD Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 19 page 3-42 once and only once for each measurement cycle starting 101/11 pulses after the end of the full measurement cycle. Digit 5 (MSD) goes high at the end of the measurement cycle and stays on for 201/21 counts. In the center of this digit pulse (to avoid race conditions between changing BCD and digit drives) the first STROBE pulse goes negative for 1/ 2 clock pulse width. Similarly, after Digit 5, Digit 4 goes high (for 200/20 clock pulses) and 100/10 pulses later the STROBE goes negative for the second time. This continues through Digit 1 (LSD) when the fifth and last STROBE pulse is sent. The digit drive will continue to scan (unless the previous signal was over-range) but no additional STROBE pulses will be sent until a new measurement is available. Busy (Pin 28) BUSY goes high at the beginning of signal integrate and stays high until the first clock pulse after zero-crossing (or after end of measurement in the case of an OVER-RANGE). The internal latches are enabled (i.e., loaded) during the first clock pulse after BUSY and are latched at the end of this clock pulse. The circuit automatically reverts to auto-zero when not BUSY so it may also be considered an A-Z signal. A very simple means for transmitting the data down a single wire pair from a remote location would be to AND BUSY with clock and subtract 10,001/1,001 counts from the number of pulses received - as mentioned previously there is one “NO- count” pulse in each Reference Integrate cycle. Over-Range (Pin 4) This pin goes positive when the input signal exceeds the range (20,000/2,000) of the converter. The output F-F is set at the end of BUSY and is reset to zero at the beginning of Reference Integrate in the next measurement cycle. Under-Range (Pin 13) This pin goes positive when the reading is 9% of range or less. The output F-F is set at the end of BUSY (if the new reading is 1800/180 or less) and is reset a the beginning of Signal Integrate of the next reading. Polarity (Pin 3) This pin is positive for a positive input signal. It is valid even for a zero reading. In other words, +0000 means the signal is posi- tive but less than the least significant bit. The converter can be used as null detector by forcing equal (+) and (-) readings. The null at this point should be less than 0.1 LSB. This output becomes valid at the beginning of Reference Integrate and remains correct until it is revalidated for the next measurement. Digit Drives (Pins 19, 24, 25, 26, and 27) Each digit drive is a positive-going signal which lasts for 200/20 clock pulses. The scan sequence is D5(MSD), D4, D3, D2, and D1 (LSD). All five digits are scanned even when operating in the 31/2 digit mode, and this scan is continuous unless and OVER-RANGE occurs. Then all Digit drives are blanked from the end of the STROBE sequence until the beginning of Reference Integrate, at which time D5 will start the scan again. This gives a blinking display as a visual indication of OVER-RANGE. BCD (Pins 20, 21, 22 and 23) The Binary coded decimal bit B8, B4, B2, and B1 are positive logic signals that go on simultaneously with the Digit driver. FIGURE 5. TIMING DIAGRAM FOR OUTPUTS AUTO COUNTS 10,001 INTEGRATOR BUSY SIGNAL COUNTS 10,000 INTEG. REFERENCE COUNTS MAX 20,001 / 2,001 INTEGRATE D5 D4 D3 D2 D1 AUTO ZERO DIGIT SCAN FOR OVER-RANGE SIGNAL INTEGRATE REFERENCE INTEGRATE D1 D2 D3 D4 D5 †FIRST D5 OF AZ AND REF INT ONE COUNT LONGER STROBE 1000 †/100 COUNTS DIGIT SCAN FOR OVER-RANGE EXPANDED SCALE BELOW / 1,000 OVER-RANGE WHEN APPLICABLE UNDER-RANGE WHEN APPLICABLE OUTPUT / 1,001 ZERO FULL MEASUREMENT CYCLE 40,002/4,002 COUNTS ICL8052/ICL71C03, ICL8068/ICL71C03 |
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