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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： | 7/27页 |
| 文件大小： | 410K |
| 代理商： | L9524C-TR |
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L9524C
Functional description
15/27
Though in mode 2 (relay mode, serial diagnostic interface protocol) the relay should be
switched permanently the L9524C also expects a PWM signal at the CI pin since the serial
diagnostic interface protocol is synchronized by falling edges of the CI signal (see section
“Diagnostic output”). The relay then is switched on permanently if the off time (time between
rising and falling edge) of the PWM signal is less than tIO sup since the relay output
suppresses pulses shorter than tIO sup (see section “Relay output”). For the same reason the
relay is switched off permanently if the on time (time between falling and rising edge) of the
PWM signal is less than tIO sup. In all other cases the relay is switched according to the
PWM signal at the CI pin.
Figure 6.
Control input signal in mode 2 for permanent switch on
In mode 1 (relay mode, go/no-go diagnostic interface protocol) no edges are necessary for
the go/no-go protocol. Therefore the relay is switched on if VCI = VCI on and it is switched off
if VCI = VCI off.
4.4
Diagnostic output
The diagnostic output stage of the L9524C (DO pin) consists of a current-limited low-side
switch and a pull-up resistor RDO to the VS pin. The voltage level of a logical low signal VDOL
is given by the drop across the low-side switch and the voltage level of a logical high signal
is equal to VVS.
The L9524C is able to detect the following failures (see sections “Supply”, “Current
monitoring”, and “Switch monitoring”):
●
open-load (6 glow plugs),
●
overcurrent (6 glow plugs, stored until power-down),
●
any switch is defect (4 switches),
●
supply voltage (VVS) is too low (“under voltage”),
●
supply voltage (VVS) is too high (“over voltage”),
●
junction temperature (TJ) is too high,
●
charge pump voltage (VCP) is too low (“charge pump under voltage”), and
●
battery voltage (VBAT) is too low (“battery under voltage”).
V
CI
t
V
CI off
V
CI on
0.6 . V
VS
0.4 . V
VS
t
relay
ON
OFF
T
CI
t
IO sup
t
IO sup
t
CI fil +tdel
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