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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD5121 датащи(PDF) 21 Page - Analog Devices |
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AD5121 датащи(HTML) 21 Page - Analog Devices |
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21 / 32 page  Data Sheet AD5121/AD5141 Rev. 0 | Page 21 of 32 Daisy-Chain Connection Daisy chaining minimizes the number of port pins required from the controlling IC. As shown in Figure 39, the SDO pin of one package must be tied to the SDI pin of the next package. The clock period may need to be increased because the propagation delay of the line between subsequent devices. When two AD5121/ AD5141 devices are daisy chained, 32 bits of data are required. The first 16 bits assigned to U2, and the second 16 bits assigned to U1, as shown in Figure 40. Keep the SYNC pin low until all 32 bits are clocked into their respective serial registers. The SYNC pin is then pulled high to complete the operation. A typical connection is shown in Figure 39. To prevent data from mislocking (for example, due to noise) the part includes an internal counter, if the clock falling edges count is not a multiple of 8, the part ignores the command. A valid clock count is 16, 24, or 32. The counter resets when SYNC returns high. MOSI SS SCLK MISO MICROCONTROLLER SDI SDO SCLK SCLK RP 2.2k Ω RP 2.2k Ω SDI SDO U1 U2 AD5121/ AD5141 AD5121/ AD5141 SYNC SYNC VLOGIC VLOGIC Figure 39. Daisy-Chain Configuration DB15 SCLK SYNC MOSI 1 2 16 DB0 DB15 SDO_U1 32 DB15 DB0 DB15 DB0 17 18 DB0 INPUT WORD FOR U2 INPUT WORD FOR U1 INPUT WORD FOR U2 UNDEFINED Figure 40. Daisy-Chain Diagram |
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