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TC14433 Folha de dados(PDF) 8 Page - TelCom Semiconductor, Inc |
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TC14433 Folha de dados(HTML) 8 Page - TelCom Semiconductor, Inc |
8 / 10 page 3-134 TELCOM SEMICONDUCTOR, INC. 3-1/2 DIGIT A/D CONVERTERS TC14433 TC14433A APPLICATIONS INFORMATION Figure 10 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 (see recommended operating conditions, page 2). The circuit in Figure 11 shows a 3-1/2 digit LCD voltme- ter. 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. CAUTION 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. Figure 14 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 seg- ment drive and the 75492 or 1413 provides sink for digit current. Display is blanked during the overrange condition. Figure 13. Demultiplexing for TC14433 BCD Data D POL 14042B C R 14175B C POL 14175B C C 14042B POL POL 14042B C C 14042B POL POL 14175B C POL 14175B C Q DS MULTIPLEXED BCD EOC VDD VDD VDD VDD VDD VDD VDD 1 DS2 DS1 DS2 DS3 DS4 0 D1 D2 D3 D0 D1 D2 D3 D0 D1 D2 D3 D0 D1 D2 D3 0 Q1 Q2 Q3 Q0 Q1 Q2 Q3 Q0 Q1 Q2 Q3 Q0 Q1 Q2 Q3 D Q 0 D1 D2 D3 0 Q1 Q2 Q3 D0 D1 D2 D3 Q0 Q1 Q2 Q3 D0 D1 D2 D3 Q0 Q1 Q2 Q3 D0 D1 D2 D3 Q0 Q1 Q2 Q3 TRUTH TABLE Coded Condition BCD to 7-Segment of MSD Q3 Q2 Q1 Q0 Decoding +0 1 1 1 0 Blank –0 1 0 1 0 Blank +0 UR 1 1 1 1 Blank –0 UR 1 0 1 1 Blank +1 0 1 0 0 4–1 Hook up –1 0 0 0 0 0–1 only +1 OR 0 1 1 1 7–1 segments –0 OR 0 0 1 1 3–1 b and c to MSD NOTES: 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. |
Nº de peça semelhante - TC14433 |
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Descrição semelhante - TC14433 |
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