参数资料
型号: MC33874BPNAR2
厂商: Freescale Semiconductor
文件页数: 30/38页
文件大小: 0K
描述: IC SW QUAD HI SIDE 35MOHM 24PQFN
标准包装: 1,200
类型: 高端
输入类型: SPI
输出数: 4
导通状态电阻: 35 毫欧
电源电压: 6 V ~ 27 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 24-PowerQFN
供应商设备封装: 24-PQFN(12x12)
包装: 带卷 (TR)
TYPICAL APPLICATION
DIAGNOSIS WITHOUT MCU
When any fault appears (over-current, open load…), a full
fault status pin allows reduced diagnosis, as illustrated in
table 3.
diagnosis can be reported via the SPI. Without an MCU, the
Table 3. Diagnosis without SPI
IN[x] level
HS[x] level
FS level
Latched
Normal operation
Over-temperature
Under-voltage
Over-voltage
Over-current
Short-circuit to VPWR
Open load
H
L
L
H
L
H
L
H
L
H
L
H
L
H
H
L
L
L
L
L
L
L
L
L
H
H
Z
H
H
H
L
L
L
L
H
L
H
L
L
H
L
H
N/A
YES
YES
NO
YES
NO
NO
H : High Level, L : Low Level, Z : High-impedance, potential depends on the external circuit
We can note that it is not possible to distinguish over
temperature, over-current, under-voltage, and over-voltage.
Nevertheless, Open load and short-circuit to V PWR fault can
be singled out. All protections are reported to Fault status pin
(FS), Open load and short-circuit to V PWR are reported only if
the Output is OFF. If the fault is latched, the output must be
turned OFF then ON to disable the fault.
CONCLUSION
Although the MC33874 is not fully functional without a
microcontroller to control and program it, standalone
functioning is safe because all protections are available.
Diagnosis is limited, but the fault status pin will report any
malfunction.
This is a good way to evaluate the main electrical
MC33874 features. Some simplified applications can also
use the MC33874 switch without an MCU to drive a high
power load with full protection.
33874
Analog Integrated Circuit Device Data
30
Freescale Semiconductor
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