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L9678P Datasheet(PDF) 165 Page - STMicroelectronics

Part # L9678P
Description  Automotive user configurable airbag and battery cut-off IC
PDF  215 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P Datasheet(HTML) 165 Page - STMicroelectronics

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DS11626 Rev 9
165/216
L9678P, L9678P-S
System voltage diagnostics
214
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/pyroswitch 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 a 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 165. 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]
0
0
0
0
0
0
0
0
Unused
0
0
0
0
0
0
1
1
ADC Test Pattern 1
Ground reference
0
0
0
0
0
1
0
2
ADC Test Pattern 2
Full scale reference
0
0
0
0
0
1
1
3
DC Sensor ch. selected, Voltage
DCSV_selected
0
0
0
0
1
0
0
4
DC Sensor ch. selected, Current
DCSI_selected
0
0
0
0
1
0
1
5
DC Sensor ch. selected, Resistance(1)
DCSV and DCSI selected
0
0
0
0
1
1
0
6
Squib/pyroswitch measurement loop
selected
Voutx
0
0
0
0
1
1
1
7
Bandgap reference Voltage
VBGR
0
0
0
1
0
0
0
8
Bandgap reference monitor Voltage
VBGM
0
0
0
1
0
0
1
9
Unused
0
0
0
1
0
1
0 10
Temperature Measurement
TEMP
0
0
0
1
0
1
1
11
DC Sensor ch 0, Voltage
DCSV_0
0
0
0
1
1
0
0 12
DC Sensor ch 1, Voltage
DCSV_1
0
0
0
1
1
0
1 13
DC Sensor ch 2, Voltage
DCSV_2
0
0
0
1
1
1
0 14
DC Sensor ch 3, Voltage
DCSV_3
0
0
0
1
1
1
1 15
Unused
0
0
1
0
0
0
0 16
Unused
0
0
1
0
0
0
1 17
Unused



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