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參數(shù)資料
| 型號： | L9524C-TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封裝： | LEAD FREE, SOP-24 |
| 文件頁數(shù)： | 9/27頁 |
| 文件大小： | 410K |
| 代理商： | L9524C-TR |
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L9524C
Functional description
17/27
Each transmission frame consists of a beginning delimiter (one low bit) followed by the 8 bits
of the failure register beginning with bit 1. After the ending delimiter (one high bit) the
diagnostic output stage is inactive and is resistively pulled up to VVS.
The L9524C starts transmitting the first frame at the very first falling edge of the CI signal
after power-on. Since at that time the contents of the failure register are clear the first 9 bits
(beginning delimiter followed by the contents of the 8-bit failure register) which are
transmitted are always low. The L9524C repeats transmission of the frame every 32 falling
edges of the CI signal. Only during the time when the diagnostic output stage is inactive (i.e.
between the transmission of two frames) the contents of the failure register can be written.
Figure 7.
Serial diagnostic interface protocol
4.5
Current monitoring
The L9524C is able to monitor the current through 6 glow plugs by measuring the voltage
drop across sense resistors. Therefore, there are 4 positive sense input pins (SP1, SP2,
SP3, SP4) and 6 negative sense input pins (SN1, SN2, SN3, SN4, SN5, SN6). The sense
input pins must be connected to the sense resistors according to the following table:
bi
t1
bi
t2
bi
t3
bi
t4
bi
t5
bi
t6
bi
t7
bi
t8
low
hi
gh
hi
gh
bi
t1
bi
t2
bi
t3
bi
t4
bi
t5
bi
t6
bi
t7
bi
t8
low
begin
n
ing
delim
iter
en
ding
de
limiter
contents of failure register
(all bits='low' at 1st frame)
contents of failure register
diagnostic
output
stage
inactive
begin
n
ing
delim
iter
en
ding
de
limiter
first frame
frame
01
234
567
89
10 11
31
0
123
456
789
10
...
VVS
VCI
VCI off
VCI on
VDO
VVS
VDOL
t
...
Table 9.
Sense input pin connection
Sense resistor of glow plug
Positive sense input pin
Negative sense input pin
1SP1
SN1
2SP2
SN2
3SP3
SN3
4SP4
SN4
5SP2
SN5
6SP4
SN6
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