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TC14433A Scheda tecnica(PDF) 7 Page - Microchip Technology |
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TC14433A Scheda tecnica(HTML) 7 Page - Microchip Technology |
7 / 24 page © 2008 Microchip Technology Inc. DS21394D-page 7 TC14433/A 16 19 DS4 Digit select pin. The digit select output goes high when the respective digit is selected. The MSD (1/2 digit turns on immediately after an EOC pulse). 17 20 DS3 The remaining digits turn on in sequence from MSD to LSD. 18 21 DS2 To ensure that the BCD data has settled, an inter digit blanking time of two clock periods is included. 19 23 DS1 Clock frequency divided by 80 equals multiplex rate. For example, a system clock of 60 kHz gives a multiplex rate of 0.8 kHz. 20 24 Q0 See Figure 5-4 for digit select timing diagram. 21 25 Q1 BCD data output pin. Multiplexed BCD outputs contain three full digits of information during digit select DS2, DS3, DS4. 22 26 Q2 During DS1, the 1/2 digit, overrange, underrange and polarity information is available. 23 27 Q3 Refer to the Truth Table 5-1. 24 28 VDD Positive power supply. This is the most positive power supply pin. — 1 NC Not Used. — 8 NC Not Used. — 15 NC Not Used. — 22 NC Not Used. TABLE 3-1: PIN FUNCTION TABLE (CONTINUED) Pin No. 24-Pin PDIP, SOIC Pin No. 28-Pin PLCC Symbol Description |
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