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L9945TR データシート(PDF) 42 Page - STMicroelectronics |
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L9945TR データシート(HTML) 42 Page - STMicroelectronics |
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42 / 144 page  Table 28. SPI electrical characteristics Symbol Parameter Comment Min. Max. Unit fSCK Clock frequency (50% duty cycle) SPI works for all frequencies 0 5 MHz tsdo_trans SDO Rise and Fall time 20 pF to 150 pF load 5 35 ns tclh Minimum time SCLK=HIGH - 75 - ns tcll Minimum time SCLK=LOW - 75 - ns tpcld Propagation delay – incl. Rise/Fall time (SCLK to data at SDO active) 150 pF load - 50 ns tcsdv NCS = LOW to output SDO active 150 pF load - 90 ns tsclch SCLK low before NCS low (setup time SCLK to NCS change H/L) - 75 - ns SCLK change L/H after NCS = low thclcl_app SCLK change L/H after NCS = low - 600 - ns tscld SDI input setup time (SCLK change H/L after SDI data valid) - 15 - ns thcld SDI input hold time (SDI data hold after SCLK change H/L) - 15 - ns tsclcl SCLK low before NCS high - 100 - ns thclch SCLK high after NCS high - 100 - ns tpchdz NCS L/H to SDO @ high impedance - - 75 ns tonNCS NCS min. high time Minimum high time between two consecutive commands 400 - ns CIN_SPI Input capacitance at SDI; SDO; SCLK; NCS - - 10 pF tfNCS NCS Filter time (Pulses ≤ tfNCS will be ignored) - 10 40 ns VSDOH High output level ISDO = -2 mA VIO - 0.4 V - V VSDOL Low output level ISDO = 3.2 mA - 0.4 V ISDO_Leak Three state leakage current NCS = HIGH; 0 < VSDO ≤ VIO – 0.3 V -5 15 µA NCS = HIGH; VSDO = VIO 2 30 µA SDO protection; 0 V < VIO < 36 V; 0 < VSDO < 36 V; all voltages are independent VOV_SDO Over voltage detection threshold at SDO output - VIO + 0.05 VIO + 0.2 V tOV_SDO_fil Overvoltage detection analog filter time - 100 700 ns tOFF_PROT_OV Overvoltage detection HS turn OFF/ON time at SDO - 0.5 5 μs IOVpeak_SDO_HS Maximum possible peak reverse current at SDO HS before protection Turn Off VSDO = 36 V; VIO = 3 V; limited by RDSON only 90 250 mA Communication Check tCC Communication Timeout DIS/NDIS released after NRES release. 55 85 ms tCC_INIT Deadline for the first communication engagement DIS/NDIS released before NRES release. 110 165 ms L9945 Functional description DS12275 - Rev 10 page 42/144 |
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