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L99DZ120 データシート(PDF) 86 Page - STMicroelectronics |
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L99DZ120 データシート(HTML) 86 Page - STMicroelectronics |
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86 / 161 page  Application information L99DZ120 86/161 DS11567 Rev 5 During watchdog long-open window, the H-bridge drivers are forced off until the first valid watchdog trigger in window mode (setting TRIG = 0 during safe window). The Control Registers remain accessible during long open window. 4.24 H-bridge driver slew-rate control The rising and falling slope of the drivers for the external high-side Power-MOS can be slew rate controlled. If this mode is enabled the gate of the external high-side Power-MOS is driven by a current source instead of a low-impedance output driver switch as long as the drain-source voltage over this Power-MOS is below the switch threshold. The current is programmed using the bits SLEW_x<4:0> (CR 10), which represent a binary number. This number is multiplied by the minimum current step. This minimum current step is the maximum source-/sink-current (IGHxrmax / IGHxfmax) divided by 31. Programming SLEW_x <4:0> to 0 disables the slew rate control and the output is driven by the low- impedance output driver switch. Table 50. H-bridge control truth table Control pins Control bits Failure bits Output pins Motor config Comment Nb 1 x x 0 xxxx xxx RL RL RL RL H-bridge disabled 2 x x 1 x x 1 0 0 0 0 RL RL RL RL Single Charge pump voltage too low 3 x x 1 xx 0 x xx 1 RL RL RL RL Thermal shutdown 4 x x 1 x x 010 00 L L L L Overvoltage 5 x x 1 x x 000 10 L(1) L(1) L(1) L(1) Short-circuit(1) 6 0 1 1 x x 0 0 0 0 0 L H H L Bridge H2/L1 on 7 x 0100000 00 L H L H Slow-decay mode LS1 and LS2 on 8 0 0101000 00 L H L L Slow-decay mode LS1 on 9 1 0101000 00 L L L H Slow-decay mode LS2 on 10 1 1 1 x x 0 0 0 0 0 H L L H Bridge H1/L2 on 11 x 0110000 00 H L H L Slow-decay mode HS1 and HS2 on 12 0 0111000 00 L L H L Slow-decay mode HS1 on 13 1 0111000 00 H L L L Slow-decay mode HS2 on 1. Only the H-bridge leg (low-side and high-side), in which one MOSFET is in short-circuit condition is switched off. Both MOSFETs of the other H-bridge leg remain active and driven by DIRH and PWMH. |
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