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L9908 数据表(PDF) 46 Page - STMicroelectronics |
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L9908 数据表(HTML) 46 Page - STMicroelectronics |
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46 / 152 page  If VDH ≥ VDH_ov_th occurs for an interval longer than T_vdh_ov_flt filtering time, VDH_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 level of motor`s battery stage monitor is safety relevant and then a self-check procedure is implemented on its monitor. The under-voltage thresholds VDH_uv_th can be configured by dedicated SPI bits as follows: Table 39. Motor battery monitor UV threshold configuration bits VDH_UV_CFG1 VDH_UV_CFG0 Description 0 0 12 V Systems (Defaults) 0 1 24 V Systems 1 0 48 V Systems 1 1 VDH UV Disabled The over-voltage threshold VDH_ov_th can be configured by dedicated SPI bits as follows: Table 40. Motor battery monitor OV threshold configuration bits VDH_OV_CFG2 VDH_OV_CFG1 VDH_OV_CFG0 Description 0 0 0 12 V Systems 1 0 0 1 12 V Systems 2 0 1 0 24 V Systems 1 0 1 1 24 V Systems 2 1 0 0 48 V Systems 1 1 0 1 48 V Systems 2 1 1 0 48 V Systems 3 1 1 1 48 V Systems 4 (Defaults) The filter time on under/over voltage diagnosis T_vdh_uv_flt/ T_vdh_ov_flt can be configured by dedicated SPI bits as follows: Table 41. Motor battery monitor filtering configuration bits VDH_FLT_CFG1 VDH_FLT_CFG0 Description 0 0 12.25 μs (Defaults) 0 1 25 μs 1 0 50 μs 1 1 100 μs Table 42. Motor battery monitor electrical characteristics Symbol Parameter Test Condition Min Typ Max Unit Notes VDH_cp2_bst_mode_th CP2 boost mode enable threshold - 10.3 10.6 10.9 V Comparator output Low to High VDH_cp2_bst_mode_hys CP2 boost mode enable hysteresis - 0.95 1.05 1.1 V - VDH_cp2_bst_mode_flt CP2 boost mode enable detection filter time - 100 200 300 ns Analog Filter L9908 Functional description DS13546 - Rev 5 page 46/152 |
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