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L9678P Datasheet(PDF) 167 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) 167 Page - STMicroelectronics

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DS11626 Rev 9
167/216
L9678P, L9678P-S
System voltage diagnostics
214
Proper scaling is necessary for various voltage measurements. The divider ratios vary by
measurement and are summarized by function in the table below.
0
1
1
0
0
1
1 51
Remote sensor Interface Voltages ch. 1
RSU1
0
1
1
0
1
0
0 52
Unused
0
1
1
0
1
0
1 53
Unused
0
1
1
0
1
1
0 54
SSxy Voltage ch. 0
SS01
0
1
1
0
1
1
1 55
SSxy Voltage ch. 1
SS01
0
1
1
1
0
0
0 56
SSxy Voltage ch. 2
SS23
0
1
1
1
0
0
1 57
SSxy Voltage ch. 3
SS23
0
1
1
1
0
1
0 58
Unused
0
1
1
1
0
1
1 59
Unused
0
1
1
1
1
0
0 60
Unused
0
1
1
1
1
0
1 61
Unused
0
1
1
1
1
1
0 61
Unused
0
1
1
1
1
1
1 63
Unused
1
0
0
0
0
0
0 64
Unused
1
0
0
0
0
0
1 65
Unused
1
0
0
0
0
1
0 66
VRESDIAG
VRESDIAG
1
0
0
0
0
1
1 67
VDD5
VDD5
1
0
0
0
1
0
0 68
VDD3V3
VDD3V3
1
0
0
0
1
0
1 69
ISOK output voltage
ISOK
1
0
0
0
1
1
0 70
SF0 voltage
SF0
1
0
0
0
1
1
1 71
SF1 voltage
SF1
1
0
0
1
0
0
0 72
SF2 voltage
SF2
1
0
0
1
0
0
1 73
SF3 voltage
SF3
1. The DC sensor resistance measurement can only be addressed through DIAGCRTL_A command. Results are available
through DIAGCTRL_A and DIAGCTRL_B, where ADCRES_A will contain DCSI and ADCRES_B will contain DCSV.
Table 11. Diagnostics control register (DIAGCTRLx) (continued)
ADC Request (ADCREQx)
Voltage measurement selection
ADC Results (ADCRESx)
Bit [6:0]
Hex
Bit [9:0]
Table 12. Diagnostics divider ratios
Measurements
Divider Ratio
15:1
10:1
7.125:1
7:1
4:1
1:1
VER
X
ERBOOST
X
VSF
X



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