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TC815 датащи(PDF) 19 Page - Microchip Technology |
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TC815 датащи(HTML) 19 Page - Microchip Technology |
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19 / 26 page ![]() © 2002 Microchip Technology Inc. DS21474B-page 19 TC815 TABLE 9-1: 10.0 EXTERNAL CRYSTAL The TC815 is designed to operate with a 32,768Hz crystal. This frequency is internally divided by two to give a 61.04µsec clock period. One conversion takes 8000 clock periods or 488.3 msec ( ≈ 2 conversions/ second). Integration time is 1638.5 clock periods or 100msec. The 32kHz quartz crystal is readily available and inex- pensive. The 32kHz crystal is commonly used in digital clocks and counters. Several crystal sources exist. A partial listing is: • Statek Corporation 512 N. Main Orange, CA 92668 (714) 639-7810 TWX: 910-593-1355 TELEX: 67-8394 • Fox Electronics 5570 Enterprise Parkway Fort Myers, FL 33905 (941) 693-0099 Contact manufacturer for full specifications. PAD BP1 BP2 BP3 PAD COM1 COM2 COM3 1BP1 / / 19 / / / 2 / BP2 / 20 / / / 3 / / BP3 21 / / / 4/ LO Ω A22 / / / 5/ W V 23 / / / 6HOLD k m 24 / / / 7b1 c1 / 25 / / / 8a1 g1 d1 26 / / / 9f1 e1 / 27 / / / 10 b2 c2 P2 28 / / / 11 a2 g2 d2 29 / / / 12 f2 e2 / 30 / / / 13 b3 c3 P3 31 / / / 14 a3 g3 d3 32 / / / 15 f3 e3 / 33 / / / 16 b4 c4 P4 34 / / / 17 AC Auto 35 / / / 18 –MEM / 36 / / / |
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