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L9945 データシート(PDF) 23 Page - STMicroelectronics |
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L9945 データシート(HTML) 23 Page - STMicroelectronics |
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23 / 151 page  Note: Tj = Tj_op; VVPS_UV < VVPS < 60 V, all supplies are independent; 4.5 V < VDD5 < 5.5 V; 3.0 V < VIO < 5.5 V, unless otherwise noted. Table 12. SDO pin electrical characteristics Symbol Parameter Test condition Min. Max. Unit tsdo_trans SDO Rise and Fall time CLOAD = 20 to 150 pF 5 35 ns tpcld Propagation delay – incl. Rise/Fall time (SCLK to data at SDO active) CLOAD = 150 pF - 50 ns tcsdv NCS = LOW to output SDO active CLOAD = 150 pF - 90 ns tpchdz NCS L/H to SDO @ high impedance - - 75 ns CIN_SPI Input capacitance at SDI; SDO; SCLK; NCS - - 10 pF 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 Tri state leakage current NCS = HIGH; 0 < VSDO < VIO – 0.3 V -5 5 µA NCS = HIGH; VSDO = VIO – 0.3 V -5 15 µA NCS = HIGH; VSDO = VIO 2 30 µA VOV_SDO Over voltage detection threshold at SDO output (for reverse supply protection) Prevent output from damage; avoid back supply to VIO; no hysteresis required 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. Includes analog filter time and comparator reaction time until 50% IOVpeak_SDO_HS 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; HS channel On 90 250 mA Note: The SDO pin electrical characteristics are also reported in the SPI table. SDO PCB trace must be routed carefully in order avoid spikes on SDO pin, which may generate an overvoltage failure. A pull-down resistor in the [10 - 47] kΩ range on SDO pin is also recommended. 5.3 Reset The device is reset by the following two events: Power On Reset (POR) • 0 ≤ VDD5 ≤ VPOR: – Logic is reset; – Outputs are in three-state, diagnostics regulators for open load detection are OFF; – No violation of leakage current requirements; – Charge pump is disabled. L9945 Reset DS12275 - Rev 8 page 23/151 |
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