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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9678P датащи(PDF) 159 Page - STMicroelectronics |
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L9678P датащи(HTML) 159 Page - STMicroelectronics |
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159 / 203 page  DocID029274 Rev 3 159/203 L9678P, L9678P-S System voltage diagnostics 202 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 switch sensor measurement (refer to Section 9: DC sensor interface). 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 L9678P IC via the ADC measurement Registers (ADCREQx) as shown in Table 11: Diagnostics control register (DIAGCTRLx) on page 159. 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). Table 11. Diagnostics control register (DIAGCTRLx) ADC Request (ADCREQx) Voltage measurement selection ADC Results (ADCRESx) Bit [6:0] Hex Bit [9:0] 000000 0 0 $00 Unused 000000 1 1 $01 ADC Test Pattern 1 Ground reference 000001 0 2 $02 ADC Test Pattern 2 Full scale reference 000001 1 3 $03 DC Sensor ch. selected, Voltage DCSV_selected 000010 0 4 $04 DC Sensor ch. selected, Current DCSI_selected 000010 1 5 $05 DC Sensor ch. selected, Resistance(1) DCSV and DCSI selected 000011 0 6 $06 Squib measurement loop selected Voutx 000011 1 7 $07 Bandgap reference Voltage VBGR 000100 0 8 $08 Bandgap reference monitor Voltage VBGM 000100 1 9 $09 Unused 000101 0 10 $0A Temperature Measurement TEMP 000101 1 11 $0B DC Sensor ch 0, Voltage DCSV_0 000110 0 12 $0C DC Sensor ch 1, Voltage DCSV_1 000110 1 13 $0D DC Sensor ch 2, Voltage DCSV_2 000111 0 14 $0E DC Sensor ch 3, Voltage DCSV_3 000111 1 15 $0F Unused 001000 0 16 $10 Unused 001000 1 17 $11 Unused 001001 0 18 $12 Unused |
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