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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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IMX35 датащи(PDF) 98 Page - Freescale Semiconductor, Inc |
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IMX35 датащи(HTML) 98 Page - Freescale Semiconductor, Inc |
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98 / 148 page  i.MX35 Applications Processors for Industrial and Consumer Products, Rev. 6 Freescale Semiconductor 98 4.9.16 1-Wire Timing Specifications Figure 71 depicts the RPP timing, and Table 60 lists the RPP timing parameters. Figure 71. Reset and Presence Pulses (RPP) Timing Diagram MLBCLK high time tmckh 9.7 9.3 10.6 10.2 — — ns PLL unlocked MLBCLK pulse width variation tmpwv —— 0.7 ns pp Note2 MLBSIG/MLBDAT input valid to MLBCLK falling tdsmcf 1— — ns — MLBSIG/MLBDAT input hold from MLBCLK low tdhmcf 0— — ns — MLBSIG/MLBDAT output high impedance from MLBCLK low tmcfdz 0— tmckl ns — Bus Hold Time tmdzh 2— — ns Note3 1 The MLB Controller can shut off MLBCLK to place MediaLB in a low-power state. 2 Pulse width variation is measured at 1.25 V by triggering on one edge of MLBCLK and measuring the spread on the other edge, measured in ns peak-to-peak (pp) 3 The board must be designed to insure that the high-impedance bus does not leave the logic state of the final driven bit for this time period. Therefore, coupling must be minimized while meeting the maximum capacitive load listed. Table 60. RPP Sequence Delay Comparisons Timing Parameters ID Parameters Symbol Min. Typ. Max. Units OW1 Reset time low tRSTL 480 511 — µs OW2 Presence detect high tPDH 15 — 60 µs OW3 Presence detect low tPDL 60 — 240 µs OW4 Reset time high tRSTH 480 512 — µs Table 59. MLB Device 1024Fs Timing Parameters (continued) Parameter Symbol Min Typ Max Units Comment 1-Wire bus DS2502 Tx “Presence Pulse” (BATT_LINE) 1-WIRE Tx “Reset Pulse” OW1 OW2 OW3 OW4 |
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