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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCA2000 датащи(PDF) 10 Page - NXP Semiconductors |
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PCA2000 датащи(HTML) 10 Page - NXP Semiconductors |
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10 / 19 page  2003 Dec 17 10 Philips Semiconductors Product specification 32 kHz watch circuit with programmable adaptive motor pulse PCA2000; PCA2001 handbook, full pagewidth MGW356 VDD VP(mod) VDD(mod) VSS VP(start) tp(start) t0 t1 t1 t1 t3 t2 t3 t2 t3 t3 t4 tstore Vstore Vpre-store tpre-store Fig.7 Supply voltage modulation for programming. Checking memory content The stored data of the OTP array can be checked bit wise by measuring the supply current. The array word is selected by the instruction state and the bit is addressed by the shift register. To read a word, the word is first selected (pulse distance t1), and a logic 1 is written into the first cell of the shift register (pulse distance t3). This logic 1 is then shifted through the entire shift register (pulse distance t2), so that it points with each clock pulse to the next bit. If the addressed OTP cell contains a logic 1, a 30 k Ω resistor is connected between VDD and VSS, which increases the supply current accordingly. Figure 8 shows the supply voltage modulation for reading word B, with the corresponding supply current variation for word B = 110101 (sequence: first MSB and last LSB). |
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