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MC1403BP1 Datasheet(PDF) 5 Page - ON Semiconductor |
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MC1403BP1 Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 8 page MC1403, B http://onsemi.com 5 3−1/2−Digit Voltmeter − Common Anode Displays, Flashing Overrange An example of a 3−1/2−digit voltmeter using the MC14433 is shown in the circuit diagram of Figure 8. The reference voltage for the system uses an MC1403 2.5 V reference IC. The full scale potentiometer can calibrate for a full scale of 199.9 mV or 1.999 V. When switching from 2.0 V to 200 mV operation, RI is also changed, as shown on the diagram. When using RC equal to 300 k W, the clock frequency for the system is about 66 kHz. The resulting conversion time is approximately 250 ms. When the input is overrange, the display flashes on and off. The flashing rate is one−half the conversion rate. This is done by dividing the EOC pulse rate by 2 with 1/2 MC14013B flip−flop and blanking the display using the blanking input of the MC14543B. The display uses an LED display with common anode digit lines driven with an MC14543B decoder and an MC1413 LED driver. The MC1413 contains 7 Darlington transistor drivers and resistors to drive the segments of the display. The digit drive is provided by four MPS−A12 Darlington transistors operating in an emitter−follower configuration. The MC14543B, MC14013B and LED displays are referenced to VEE via Pin 13 of the MC14433. This places the full power supply voltage across the display. The current for the display may be adjusted by the value of the segment resistors shown as 150 W in Figure 8. Figure 8. 3−1/2−Digit Voltmeter Common Anode LED Display * RI = 470 kW for 2.0 V Range RI = 27 kW for 200 mV Range ** Mylar Capacitor 0.1 mF 3 2 1 +5.0 V 0.1 mF RC 300 k VX RI * 20 k −5.0 V 0.1 mF +5.0 V 0.1 mF 0.1 mF Plus Sign 50 mF Minus Sign Segment Resistors 150 W (7) MPS−A12 +5.0 V MC14013B 51 k MC14433 0.1 mF CQ Q R S D 14 DS1 6 710 −5.0 V −5.0 V C 8 6 16 1 19 5.0 V D S R Q Q +5.0 V MPS−A12 (4) 7 MC1403 200 W 110 W 0.1 mF ** DS2 DS3 DS4 1 2 8 13 12 11 9 4 3 5 10 1 2 3 4 5 9 5 3 2 4 16 15 14 13 11 12 7 15 14 13 6 11 10 14 16 17 18 15 8 7 6 5 4 13 12 9 22 23 21 24 1 12 20 2 10 11 3 ba c d e g f +5.0 V +5.0 V −5.0 V −5.0 V −5.0 V −5.0 V −5.0 V |
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