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L99LD21 数据表(PDF) 65 Page - STMicroelectronics |
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L99LD21 数据表(HTML) 65 Page - STMicroelectronics |
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65 / 73 page ![]() DS11130 Rev 5 65/73 L99LD21 Electrical specifications 72 6.4.7 Digital timings Table 46. Digital timings description Symbol Parameter Test conditions Min Typ Max Unit tWD Watchdog timeout period 45 50 55 ms tCSN_TIMEOUT CSN timeout 90 115 140 ms tAUTORESTART Autorestart time in limp home mode 45 50 55 ms tVS,UV VS undervoltage filter time 32 µs tDIN_FT (1) DIN Filter time 32 µs tDIN_ST DIN status information time 12.8 µs tSKEW Timing skew for DIN 2.5 µs tVSPI_FT VSPI Filtering Time 32 µs tWAKE_UP Time for a complete wake up (V3V3 > VPOR_L) CSN low or DIN high for t > tWAKEUP Cap on V3V3 = 4.7 µF V3V3 > 3 V 190 µs tSTDBY Time needed for a transition to standby mode (V3V3 < VPOR_L) DIN low Cap on V3V3 = 4.7 µF V3V3 < 2.5 V 1.6 ms tOVT Filtering time for overtemperature (OVT bit will be set if Tj > TTSD for more than tOVT) guaranteed by frequency oscillator (20 MHz typical) and scan 1.2 µs tBST_OVP BST_OVP flag set filtering time 32 µs tBST_OVP_RST BST_OVP flag reset filtering time 10 ms tBOOST_FB_FAIL BST_FB_FAIL flag set filtering time 1.6 µs 1. Digital timings guaranteed by scan. WD and autorestart timings limits added to give indication on application cases. |
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