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L9679P 数据表(PDF) 212 Page - STMicroelectronics |
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L9679P 数据表(HTML) 212 Page - STMicroelectronics |
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212 / 272 page  System voltage diagnostics L9679P 212/272 DocID029275 Rev 1 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 18 for reference. L9679P diagnostics is 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. In case the voltage to be measured is not immediately available, the desired inputs for conversion have to be programmed by SPI in advance, to allow them to attain a stable voltage value. This case applies to the squib resistance measurement and diagnostics (refer to Loop diagnostics control and results registers) and to the DC sensor measurement (refer to Section 11). CONVRDY_0 bit in GSW is equal to (NEWDATA_A or NEWDATA_B), while CONVRDY_1 bit in GSW corresponds to (NEWDATA_C or NEWDATA_D). Each NEWDATAx flag is asserted when conversion is finished and cleared when result is read out. However result is cleared only when new result for that register is available. When a new request is received it is queued if other conversions are ongoing. The conversions are executed in the same order as their request arrived. The queue is 4 measures long so it's possible to send all 4 requests at the same time and then wait for the results. If a DIAGCTLRx command is received twice, the second conversion request will overwrite the previous one. Requests are sent to the L9679P IC via the ADC measurement Registers (ADCREQx) as shown in Table 18. All diagnostics results are available on the ADCRESx registers, when addressed by the related ADCREQx register (e.g. data requested by ADCREQA would be written to ADCRESA). 19 18 17 16 15 14 13 12 11 10 9 8 7 6543210 MOSI xxxxxx 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 6543210 MOSI x x x x x x x x x ADCREQ_D [6:0] MISO NEWDATA_D 0 0 ADCREQ_D [6:0] ADCRES_D [9:0] |
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