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L99DZ320 データシート(PDF) 70 Page - STMicroelectronics |
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L99DZ320 データシート(HTML) 70 Page - STMicroelectronics |
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70 / 146 page  3.23 Overcurrent recovery mode Loads with startup currents higher than the overcurrent limits (for example inrush current of lamps, start current of motors) can be driven by suitably using the programmable overcurrent recovery (OCR) mode. To enable this feature, which is available for HB4-6, HS7-HS9, each of these drivers has a corresponding overcurrent recovery bit. If this bit is set, the output is turned OFF when the overcurrent threshold is reached and turned ON automatically after a programmable recovery time. The PWM modulated current provides sufficient average current to power up the load (for example heat up the bulb) until the load reaches operating condition. The recovery frequency (fOCR) as well as the on time (tOCR) is programmable in CR4. 3.24 H-bridge control The PWMH and DIRH input controls the drivers of the external H-bridge transistors. In single motor mode the motor direction can be chosen with the direction input (DIRH), the duty cycle and frequency with the PWMH input (single mode). With the SPI-registers SD (CR12) and SDS (CR12) four different slow decay modes (via drivers and via diode) can be selected using the high-side or the low-side transistors. Unconnected inputs are defined by internal pull-down current. Alternatively, the bridge can be driven in half bridge mode (dual mode). By setting the dual mode bit DM = 1, both half bridges can be used for two separated motors, using the same control pins DIRH and PWMH. Table 54. H-bridge control truth table Nb Control pins Control bits Failure bits Output pin Mode Description 1 x x 0 x x x x x x x x RL RL RL RL Single H-bridge disabled 2 x x 1 x x x 1 0 0 0 0 RL RL RL RL Charge pump voltage too low 3 x x 1 x x x 0 x x x 1 RL RL RL RL Thermal shutdown 4 x x 1 x x x 0 1 0 0 0 L L L L Overvoltage 5 x x 1 x x x 0 0 0 1 0 L(1) L(1) L(1) L(1) Short-circuit(1) 6 0 1 1 x x 0 0 0 0 0 0 L H H L Bridge H2/L1 on 7 x 0 1 0 0 0 0 0 0 0 0 L H L H Slow-decay mode LS1 and LS2 on 8 0 0 1 0 1 0 0 0 0 0 0 L H L L Slow-decay mode LS1 on 9 1 0 1 0 1 0 0 0 0 0 0 L L L H Slow-decay mode LS2 on 10 1 1 1 x x 0 0 0 0 0 0 H L L H Bridge H1/L2 on 11 x 0 1 1 0 0 0 0 0 0 0 H L H L Slow-decay mode HS1 and HS2 on 12 0 0 1 1 1 0 0 0 0 0 0 L L H L Slow-decay mode HS2 on 13 1 0 1 1 1 0 0 0 0 0 0 H L L L Slow-decay mode HS1 on 14 0 0 1 1 0 1 0 0 0 0 0 L L L L Half bridge mode 15 0 1 1 1 0 1 0 0 0 0 0 L L L H 16 1 0 1 1 0 1 0 0 0 0 0 L H L L 17 1 1 1 1 0 1 0 0 0 0 0 L H L H 18 0 0 1 0 1 1 0 0 0 0 0 L L L L L99DZ320 Functional description DS14235 - Rev 5 page 70/146 |
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