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L9908 データシート(PDF) 50 Page - STMicroelectronics |
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L9908 データシート(HTML) 50 Page - STMicroelectronics |
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50 / 152 page  5.11.2 VBP monitor VBP voltage level is monitored be means of the dedicated UV and OV diagnosis. Hysteresis on thresholds and filtering time is implemented. If VBP ≤ VBP_uv_th occurs for an interval longer than T_vbp_uv_flt filtering time, the VBP_UV flag is set. The error flag remains set until the failure condition is removed and the flag is cleared by the SPI command. If VBP ≥ VBP_ov_th occurs for an interval longer than T_vbp_ov_flt filtering time, the VBP_OV flag is set. The error flag remains set until the failure condition is removed and the flag is cleared by the SPI command. The correct operation VBP Level monitor is safety relevant and then a self-check procedure is implemented. The under-voltage threshold VBP_uv_th can be configured by dedicated SPI bits within the SAFETY_RELEVANT3 register as follows: Table 45. VBP monitor UV threshold configuration bits VBP_UV_CFG1 VBP_UV_CFG0 Description 0 0 12 V Systems (Defaults) 0 1 24 V Systems 1 0 48 V Systems 1 1 VBP UV Disabled The over-voltage threshold VBP_ov_th can be configured by dedicated SPI bits within the SAFETY_RELEVANT2 register as follows: Table 46. VBP monitor OV threshold configuration bits VBP_OV_CFG1 VBP_OV_CFG0 Description 0 0 12 V Systems 1 0 1 12 V Systems 2 1 0 24 V Systems 1 1 1 24 V Systems 2 (Defaults) The filter time on under/over voltage diagnosis T_vbp_uv_flt/ T_vbp_ov_flt can be configured by dedicated SPI bits within the SAFETY_RELEVANT3 register as follows: Table 47. VBP monitor filtering configuration bits VBP_FLT_CFG1 VBP_FLT_CFG0 Description 0 0 12.25 μs (Defaults) 0 1 25 μs 1 0 50 μs 1 1 100 μs L9908 Functional description DS13546 - Rev 5 page 50/152 |
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