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CS8420-DSZ Scheda tecnica(PDF) 10 Page - Cirrus Logic |
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CS8420-DSZ Scheda tecnica(HTML) 10 Page - Cirrus Logic |
10 / 94 page 10 DS245F4 CS8420 SWITCHING CHARACTERISTICS - CONTROL PORT - SPI™ MODE Inputs: Logic 0 = 0 V, Logic 1 = VD+; CL = 20 pF. 13. If Fso or Fsi is lower than 46.875 kHz, the maximum CCLK frequency should be less than 128 Fso and less than 128 Fsi. This is dictated by the timing requirements necessary to access the Channel Status and User Bit buffer memory. Access to the control register file can be carried out at the full 6 MHz rate. The minimum allowable input sample rate is 8 kHz, so choosing CCLK to be less than or equal to 1.024 MHz should be safe for all possible conditions. 14. Data must be held for sufficient time to bridge the transition time of CCLK. 15. For fsck < 1 MHz. Parameter Symbol Min Typ Max Units CCLK Clock Frequency (Note 13) fsck 0- 6.0 MHz CS High Time Between Transmissions tcsh 1.0 - - μs CS Falling to CCLK Edge tcss 20 - - ns CCLK Low Time tscl 66 - - ns CCLK High Time tsch 66 - - ns CDIN to CCLK Rising Setup Time tdsu 40 - - ns CCLK Rising to DATA Hold Time (Note 14) tdh 18 - - ns CCLK Falling to CDOUT Stable tpd - - 45 ns Rise Time of CDOUT tr1 - - 25 ns Fall Time of CDOUT tf1 - - 25 ns Rise Time of CCLK and CDIN (Note 15) tr2 -- 100 ns Fall Time of CCLK and CDIN (Note 15) tf2 -- 100 ns t r2 t f2 t dsu t dh t sch t scl CS CCLK CDIN t css t pd CDOUT t csh Figure 3. SPI Mode Timing |
Codice articolo simile - CS8420-DSZ |
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