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L99DZ320 Datasheet(PDF) 76 Page - STMicroelectronics |
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L99DZ320 Datasheet(HTML) 76 Page - STMicroelectronics |
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76 / 146 page  Table 55. H-bridge monitoring in off mode Nb Control bits Failure bits Comments OL H1L2 OL H2L1 H OLTH High DSMON LS1 DSMON LS2 1 0 0 0 0 0 Drain-source monitor disabled 2 1 0 x 0 0 No open-load detected 3 1 0 0 0 1 Open-load 4 1 0 0 1 1 Short to GND 5 1 0 1 1 1 Short to VS 6 0 1 x 0 0 No open-load detected 7 0 1 0 1 0 Open-load 8 0 1 0 1 1 Short to GND 9 0 1 1 1 1 Short to VS 3.29 Programmable cross current solution The external Power MOSFETs transistors in H-bridge (two half bridges) configuration are switched on with an additional delay time tCCP to prevent cross current in the half bridge. The cross current protection time tCCP can be programmed with the SPI using bits COPT<3:0> (CR12). The timer is started when the gate driver is switched on in the device. The PWMH module has 2 timers to configure locking time for high-side and freewheeling low-side. The programmable time tCCP-TIM1/CCP-TIM2 is the same. Sequence for switching in PWM mode is as follows: • HS switches off after locking tCCP-TIM1 • LS switches on after 2nd locking tCCP-TIM1 • HS switches on after locking tCCP-TIM2 which starts with rising edge on PWMH input Figure 38. PWMH cross current protection time implementation L99DZ320 Functional description DS14235 - Rev 5 page 76/146 |
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