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L9965P Datasheet(PDF) 18 Page - STMicroelectronics |
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L9965P Datasheet(HTML) 18 Page - STMicroelectronics |
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18 / 104 page  3.3.2 Power stage supply (PS) The PS pin is the power stage supply input. This line: • Feeds the level shifters between the signal stage and the power stage. • Feeds the HS circuitry of the power stage. 3.3.2.1 PS diagnostics Table 11. PS diagnostics Fault type Assertion condition IC reaction to assertion Release condition IC reaction to flag clear Maskable PS UV If the VPS voltage falls below VPS_UV_TH, the PS_UV fault is acknowledged The PS_UV flag is set FAULTN line is asserted The “fire inhibit” signal is set If the VPS voltage rises above VPS_UV _TH + VPS_UV _HYS, the PS_UV flag can be cleared by MCU FAULTN line is released Pyro-fuse fire is possible again Non-maskable PS OV If the VPS voltage rises above VPS_OV_TH, the PS_OV fault is acknowledged The PS_OV flag is set FAULTN line is asserted The “fire inhibit” signal is set If the VPS voltage drops below VPS_OV _TH - VPS_OV _HYS, the PS_OV flag can be cleared by MCU FAULTN line is released Pyro-fuse fire is possible again PS_OV_FAULTN_MSK masks fault redirection on FAULTN pin PS_OV_FIRE_MSK masks the inhibition of pyro-fuse fire commands 3.3.2.2 PS electrical parameters All parameters are tested and guaranteed in the following conditions, unless otherwise noted: all supplies according to the Table 3; TJ according to the Table 2. Table 12. PS supply electrical parameters Symbol Parameter Test condition Min Typ Max Unit Pin VPS_UV_TH PS undervoltage threshold Max slew rate = 2.3 V/ms 4.7 - 5.3 V PS VPS_UV_HYS PS undervoltage hysteresis Max slew rate = 2.3 V/ms 150 - 250 mV PS tPS_UV_FLT PS undervoltage filter time Tested by SCAN 17 20 21 µs PS VPS_OV_TH PS overvoltage threshold Considering max nom value of 26 V + 5% Max slew rate = 2.3 V/ms 27.4 - 31.1 V PS VPS_OV_HYS PS overvoltage hysteresis Max slew rate = 2.3 V/ms 150 - 250 mV PS tPS_OV_FLT PS overvoltage filter time Tested by SCAN 17 20 21 µs PS 3.3.3 IO output buffer supply (VIO) The VIO pin is the digital output buffer supply. This line feeds the SDO output buffer. It is suggested to add a bypass ceramic capacitor near the VIO pin. The VIO shall be supplied externally and it enables compatibility with both 3.3 V and 5 V controllers. There is no diagnostic on the VIO supply. L9965P Functional description DS14702 - Rev 4 page 18/104 |
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