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TC14433 Scheda tecnica(PDF) 10 Page - Microchip Technology |
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TC14433 Scheda tecnica(HTML) 10 Page - Microchip Technology |
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10 / 24 page  TC14433/A DS21394D-page 10 © 2008 Microchip Technology Inc. 5.0 TYPICAL APPLICATIONS The typical application circuit is an example of a 3-1/2 digit voltmeter using the TC14433 with Common- anode displays. This system requires a 2.5V reference. Full scale may be adjusted to 1.999V or 199.9 mV. Input overrange is indicated by flashing a display. This display uses LEDs with common anode digit lines. Power supply for this system is shown as a dual ±5V supply; however, the TC14433 will operate over a wide voltage range The circuit in Figure 5-1 shows a 3-1/2 digit LCD voltmeter. The 14024B provides the low frequency square wave signal drive to the LCD backplane. Dual power supplies are shown here; however, one supply may be used when VSS is connected to VEE. In this case, VAG must be at least 2.8V above VEE. When only segments b and c of the decoder are con- nected to the 1/2 digit of the display, 4, 0, 7 and 3 appear as 1. The overrange indication (Q3 = 0 and Q0 = 1) occurs when the count is greater than 1999; (e.g., 1.999V for a reference of 2V) The underrange indication, useful for auto-ranging circuits, occurs when the count is less than 180; (e.g., 0.180V for a reference of 2V). TABLE 5-1: TRUTH TABLE Figure 5-2 is an example of a 3-1/2 digit LED voltmeter with a minimum of external components, (only 11 additional components). In this circuit, the 14511B provides the segment drive and the 75492 or 1413 provides sink for digit current. Display is blanked during the overrange condition. Note: If the most significant digit is connected to a display other than a “1” only, such as a full digit display, segments other than b and c must be disconnected. The BCD to 7-segment decoder must blank on BCD inputs 1010 to 1111 (see Table 5-1). Coded Condition of MSD Q 3 Q 2 Q 1 Q 0 BDC to 7-Segment Decoding +01 1 1 0 Blank Blank Blank Blank -01 0 1 0 +0 UR 11 1 1 -0 UR 10 1 1 +10 1 0 0 4 – 1 0 – 1 7 – 1 3 – 1 Hook up only segments b and c to MSD -10 0 0 0 +1 OR 01 1 1 -1 OR 00 1 1 Note 1: Q3 – 1/2 digit, low for “1”, high for “0”. Q2 – Polarity: “1” = positive, “0” = negative. Q0 – Out of range condition exists if Q0 = 1. When used in conjunction with Q3, the type of out of range condition is indicated; i.e., Q3 = 0 → OR or Q3 = 1 → UR. |
Codice articolo simile - TC14433_08 |
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Descrizione simile - TC14433_08 |
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