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データシートサーチシステム |
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データシートサーチシステム |
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L9396 データシート(PDF) 75 Page - STMicroelectronics |
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L9396 データシート(HTML) 75 Page - STMicroelectronics |
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75 / 109 page  DS12539 Rev 10 75/109 L9396 System functional safety implementations 109 Figure 17. WD1 state machine Depending on the value of the WD_CNT counter the device will stop the drivers, will send the WD1_RESET or will enable the drivers. The WD_CNT will be incremented by a number of steps as defined through the SPI configurable parameter WD_cnt_good_step each time a correct answer is given in the right time interval or a Query arrives in the right time interval. In all the other cases, as defined in the WD state machine, the WD_CNT will be decremented by a number of steps as defined through the SPI configurable parameter WD_cnt_bad_step. If WD_CNT reaches the value of zero two different behaviors are possible depending on the value of WD_RST_EN. If WD_RST_EN is set to 1 then a WD_RST will be sent by the device and the flag WD_RST_CNT will be set; else if WD_RST_EN is set to 0 then the WD_RST will not be sent by the device but the flag WD_RST_CNT will be set. Two different thresholds are defined (both programmable through SPI): WD_th_low and WD_th_high. If WD_CNT value is lower than WD_th_low, but greater than zero, the drivers are disabled such as any WD_RST. If WD_CNT is greater than WD_TH_LOW and lower than WD_TH_HIGH the load actuation is managed in hysteresis mode: If drivers are ON it will be stopped only when WD_CNT becomes lower than WD_TH_LOW, while if actuation was OFF it will be performed only when WD_CNT becomes equal to WD_TH_HIGH and only when WD_CNT exceeds this threshold drivers are activated. WD_RST Request = No Req && t = T_Req_TimeOut WD_CNT-- then WD_CNT++ Request = YES && t < T_Valid_Req_Start REQ 1 WAIT Request = YES && T_Valid_Req_Start < t < T_Valid_Req_End WD_CNT-- Request = YES && T_Valid_Req_End < t < T_Req_TimeOut Request = No Req && t = T_Valid_Req_End Request = No Req && t = T_Valid_Req_Start REQ 3 WAIT REQ 2 WAIT 1 Seed Request st ANSWER 1 WAIT IDLE WD_CNT-- Answer = YES && T_Valid_Answ_End < t < T_Answ_TimeOut WD_CNT-- Answer = YES && t < T_Valid_Answ_Start elseif (Answer==wrong) then WD_CNT-- If (Answer==correct) then WD_CNT++ Answer = YES && T_Valid_Answ_Start < t < T_Valid_Answ_End Answer = No Answer && t = T_Valid_Answ_Start WD_RST Answer = No Answer && t = T_Answ_TimeOut Answer = No Answer && t = T_Valid_Answ_End ANSWER 2 WAIT ANSWER 3 WAIT GADG2401171444PS |
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