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L9658 数据表(PDF) 38 Page - STMicroelectronics

部件名 L9658
功能描述  Analog output available for resistance
PDF  64 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L9658 数据表(HTML) 38 Page - STMicroelectronics

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Functional description
L9658
38/64
Doc ID 14219 Rev 3
4.11.5
Example of short between loops diagnostic
The following SPI frame sequence is an example how to detect a short between channel 0
and the other channels. The symbol % designates the bit to be tested. This bit is cleared to
a 0 when there is a short between the selected channels. Bits D13 (Short to battery) and D3
(Over current on Squib) are relevant too. Both of them must be at 0 for no fault. It may
happens that after leakage test on channel Y, channel Y is shorted to battery, so when X is
biased and Y monitored for shorts between channels, D7=D3=0 while D13=1. This will
highlight a short to battery.
1.
Enable the diagnostic current; select IBIAS current; set the IBIAS/ISRC multiplexer to
channel 0; set the AOUT/Comparators multiplexer to channel 1. The MISO read will
depend on the previous MOSI message.
2.
Set the AOUT/Comparators multiplexer to channel 2. The MISO read will be the results
of the channel 0 to channel 1 test.
3.
Set the AOUT/Comparators multiplexer to channel 3. The MISO read will be the results
of the channel 0 to channel 2 test.
4.
Set the AOUT/Comparators multiplexer to channel 4. The MISO read will be the results
of the channel 0 to channel 3 test.
5.
Set the AOUT/Comparators multiplexer to channel 5. The MISO read will be the results
of the channel 0 to channel 4 test.
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
MISO
1
0
1
1
0
0
1
0
000
10
000
MOSI
X
X
X
X
X
X
X
X
X
XXX
XX
XX
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
MISO
1
0
1
1
0
0
1
0
001
00
000
MOSI
1
0
0
0
0
0
1
0
%
00
10
000
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
MISO
1
0
0
1
0
0
1
0
001
10
000
MOSI
1
0
0
0
0
0
1
0
%
01
00
000
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
MISO
1
0
1
1
0
0
1
0
010
00
000
MOSI
1
0
0
0
0
0
1
0
%
01
10
000
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
MISO
1
0
0
1
0
0
1
0
010
10
000
MOSI
1
0
0
0
0
0
1
0
%
10
00
000



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