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參數資料
| 型號： | L9733XP |
| 廠商： | 意法半導體 |
| 英文描述： | Octal self configuring Low/High side driver |
| 中文描述： | 八路自我配置低/高邊驅動器 |
| 文件頁數： | 24/33頁 |
| 文件大小： | 466K |
| 代理商： | L9733XP |
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Fault Operation
L9733
24/33
7
Fault Operation
The fault diagnostic capability consists of one internal 16 bits shift register and 2 bits are
used for each output. The diagnostic information are: no fault present, overcurrent, open
load and short circuit.
All of the faults will be cleared on the rising edge of Chip Select if a valid DI byte was
received
Fault Register Definition
Table 11.
If all the bits b0-b15 of the fault register have value '1' it means that a thermal fault, at least
on one of the eight independent Outputs, occurred.
7.1
Low Side Configured Output Fault Operation
The diagnostic circuitry verifies for the low side configured output the following condition:
Normal operation, open load, short circuit to GND and overcurrent (only if the switching OFF
protection, selectable for each channel via SPI bus, is active).
The diagnostic circuitry operates in two different modes, selected for each channel by SPI:
no latch mode and latch mode. The fault priority is overcurrent and then open load or short
circuit to GND, this means that if an overcurrent occurs the fault register is always
overwritten and following open load or short to GND faults that happen before that the
register is cleared will be ignored.
7.1.1
No latch mode
This diagnostic operating mode doesn't latch open load and short to GND faults.
1.
Open load
The diagnostic of open load is detected only in OFF condition sensing the Drn1-8
output voltage. This fault is detected on the falling edge of the CS input if the power
drain voltage is inside the voltage range limited by the two thresholds
Vth_Vbat
and
Table 10.
OUT 8
OUT 7
OUT6
OUT5
OUT4
OUT3
OUT2
OUT1
MSB
LSB
D1
D0
D1
D0
D1
D0
D1
D0
D1
D0
D1
D0
D1
D0
D1
D0
b15
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
Fault Logic Definition
D1
D0
FAULT STATUS
0
0
No fault is present
0
1
Open load
1
0
Short circuit to GND (low side) or Short circuit to Vbat(high side)
1
1
Overcurrent
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