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L9678P データシート(PDF) 158 Page - STMicroelectronics |
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L9678P データシート(HTML) 158 Page - STMicroelectronics |
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158 / 203 page  System voltage diagnostics L9678P, L9678P-S 158/203 DocID029274 Rev 3 13 System voltage diagnostics L9678P has an integrated dedicated circuitry to provide diagnostic feedback and processing of several inputs. These inputs are addressed with an internal analog multiplexer and made available through the SPI digital interface with the Diagnostic Data commands. In order to avoid saturation of high voltage internal signals, an internal voltage divider is used. The diagnostics circuitry is activated by four SPI Diagnostics Control commands (DIAGCTRLx); each of them can address all the available nodes to be monitored, except for what mentioned in Table 11: Diagnostics control register (DIAGCTRLx) on page 159. DIAGCTRLx SPI command bit fields are structured in the following way: DIAGCTRL_A (ADDRESS HEX 3A) DIAGCTRL_B (ADDRESS HEX 3B) DIAGCTRL_C (ADDRESS HEX 3C) DIAGCTRL_D (ADDRESS HEX 3D) ADCREQ[A-D] bit fields, used to address the different measurements offered, are listed in Table 11: Diagnostics control register (DIAGCTRLx) on page 159 for reference. L9678P diagnostics are structured to take four automatic conversions at a time. In order to get four measurements, four different SPI commands have to be sent (DIAGCTRL_A, DIAGCTRL_B, DIAGCTRL_C and DIAGCTRL_D), in no particular order. 19 18 17 16 15 14 13 12 11 10 9 8 7 654 3210 MOSI xx xxxx x x x ADCREQ_A[6:0] MISO NEWDATA_A 0 0 ADCREQ_A[6:0] ADCRES_A[9:0] 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 MOSI x x x x x x x x x ADCREQ_B [6:0] MISO NEWDATA_B 0 0 ADCREQ_B [6:0] ADCRES_B [9:0] 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 MOSI x x x x x x x x x ADCREQ_C [6:0] MISO NEWDATA_C 0 0 ADCREQ_C [6:0] ADCRES_C [9:0] 19 18 17 16 15 14 13 12 11 10 9 8 7 654 3210 MOSI xxxxxx x x x ADCREQ_D [6:0] MISO NEWDATA_D 0 0 ADCREQ_D [6:0] ADCRES_D [9:0] |
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