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参数资料
| 型号： | L9524C-TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封装： | LEAD FREE, SOP-24 |
| 文件页数： | 8/27页 |
| 文件大小： | 410K |
| 代理商： | L9524C-TR |
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Functional description
L9524C
16/27
In order to report the occurrence of any of the above-listed failures to the diesel engine
management system the L9524C provides two protocols: go/no-go protocol for mode 1 and
serial protocol for modes 2 to 6.
The go/no-go protocol is only able to report if any of the above-listed failures occurred. This
is done according to the following table:
Note:
overcurrent failures are stored until power-down.
The serial protocol is able to report different kinds of failures and to assign them to the
corresponding glow plugs. Therefore, occurring failures are written into an internal 8-bit
failure register:
Bits 1 to 6 are assigned to the glow plugs. Depending on bit 7 they show open-load (bit 7 is
low) or overcurrent failures (bit 7 is high). Bit 8 shows if there is any of the listed failures
(“module failure”). In case of a battery under voltage failure bits 7 and 8 are high and all
other bits are low as long as there is no overcurrent failure stored.
For transmitting the contents of the failure register the PWM signal applied to the CI pin is
used as clock input: at any falling edge of the CI signal (see section “Control input”) the DO
pin shows the value of the next bit of the bit stream after tDO del.
Table 7.
Go / no-go protocol description
VCI
VDO at “no failure”
VDO at “any failure”
VCI off
VDOL
VVS
VCI on
VVS
VDOL
Table 8.
Failure register description
Bit
Meaning of high state
1
Open-load or overcurrent (1) failure at glow plug 1
1.
overcurrent failures are stored until power-down
2
Open-load or overcurrent (1) failure at glow plug 2
3
Open-load or overcurrent (1) failure at glow plug 3
4
Open-load or overcurrent (1) failure at glow plug 4
5
Open-load or overcurrent (1) failure at glow plug 5
6
Open-load or overcurrent (1) failure at glow plug 6
7
Overcurrent failure at any glow plug (1) or
battery voltage (VBAT) is too low
(2) (“battery undervoltage”)
2.
if battery voltage is too low (“battery under voltage”) bits 7 and 8 are high
8
One or more of the following failures (“module failure”):
any switch is defect
supply voltage (VVS) is too low (“undervoltage”)
supply voltage (VVS) is too high (“overvoltage”)
junction temperature (TJ) is too high
charge pump voltage (VCP) is too low (“charge pump undervoltage”)
battery voltage (VBAT) is too low
(2) (“battery under voltage”)
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