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L9678P 数据表(PDF) 158 Page - STMicroelectronics

部件名 L9678P
功能描述  Automotive user configurable airbag IC
PDF  203 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L9678P 数据表(HTML) 158 Page - STMicroelectronics

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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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