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參數(shù)資料
| 型號： | MCZ33879AEK |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Configurable Octal Serial Switch with Open Load Detect Current Disable |
| 中文描述： | 串行配置八路與開放式負荷開關(guān)電流檢測禁用 |
| 文件頁數(shù)： | 20/24頁 |
| 文件大?。?/td> | 283K |
| 代理商： | MCZ33879AEK |
Analog Integrated Circuit Device Data
Freescale Semiconductor
20
33879
FUNCTIONAL DESCRIPTION
DEVICE OPERATION
An output OFF open load fault is indicated when the drain-
to-source voltage is less than the output threshold voltage
(V
OUT(
flt-th
)
) of 2.5 V to 4.0 V. Hence, the 33879 will declare
the load
open
in the OFF state when the output drain-to-
source voltage is less than V
OUT(flt-th)
.
This device has an internal 80
μ
A current source
connected from drain to source of the output MOSFET. The
current source may be programmed on or off via SPI. The
Power-ON Reset state for the current source is “off” and must
be enabled via SPI. To achieve low Sleep mode quiescent
currents, the Open Load Detection Current source of each
driver is switched off when V
DD
or EN is removed.
During output switching, especially with capacitive loads,
a false output OFF open load fault may be triggered. To
prevent this false fault from being reported, an internal fault
filter of 100
μ
s to 300
μ
s is incorporated. A false fault
reporting is a function of the load impedance, R
DS(ON)
, C
OUT
of the MOSFET, as well as the supply voltage, V
PWR
. The
rising edge of
CS
triggers the built-in fault delay timer. The
timer will time out before the fault comparator is enabled and
the fault is detected. Once the condition causing the open
load fault is removed, the device will resume normal
operation. The open load fault, however, will be latched in the
output DO register for the MCU to read.
SHORTED LOAD FAULT
A shorted load (overcurrent) fault can be caused by any
output being shorted directly to supply, or an output
experiencing a current greater than the current limit.
There are two safety circuits progressively in operation
during load short conditions that provide system protection:
1. The device’s output current is monitored in an analog
fashion using SENSEFET approach and current
limited.
2. The device’s output thermal limit is sensed and when
attained causes only the specific faulted output to shut
down. The output will remain off until cooled. The
device will then reassert the output automatically. The
cycle will continue until fault is removed or the
command bit instructs the output off. Shorted load
faults will be reported properly through SPI regardless
of Open Load Detection Current enable bits.
UNDERVOLTAGE SHUTDOWN
An undervoltage condition on V
DD
or V
PWR
will result in the
shutdown of all outputs. The V
DD
undervoltage threshold is
between 0.8 V and 3.0 V. V
PWR
undervoltage threshold is
between 3.0 V and 5.0 V. When the supplies fall below their
respective thresholds, all outputs are turned OFF. As both
supplies returns to normal levels, internal logic is reset and
the device resumes normal operation.
OUTPUT VOLTAGE CLAMP
Each output of the 33879 incorporates an internal voltage
clamp to provide fast turn-off and transient protection of each
output. Each clamp independently limits the drain-to-source
voltage to 45 V for low-side drive configurations and -20 V for
high-side drive configurations. The total energy clamped (E
J
)
can be calculated by multiplying the current area under the
current curve (I
A
) times the clamp voltage (V
CL
) (see
Figure 18
).
Characterization of the output clamps, using a single pulse
non-repetitive method at 0.35 A, indicates the maximum
energy per output to be 50 mJ at 150
°
C junction temperature.
Figure 18. Output Voltage Clamping
SPI CONFIGURATIONS
The SPI configuration on the 33879 device is consistent
with other devices in the Octal Serial Switch (OSS) family.
This device may be used in serial SPI or parallel SPI with the
33298 and 33291. Different SPI configurations may be
provided. For more information, contact Freescale Analog
Products Division or local Freescale representative.
REVERSE BATTERY
The 33879 has been designed with reverse battery
protection on the V
PWR
pin.
All outputs consist of a power MOSFET with an integral
substrate diode. During the reverse battery condition, current
will flow through the load via the substrate diode. Under this
circumstance, relays may energize and lamps will turn on.
Where load reverse battery protection is desired, a reverse
battery blocking diode must be placed in series with the load.
Current
Area (I
A
)
Clamp Energy
(E
J
= I
A
x V
CL
)
Clamp Energy
(E
J
= I
A
x V
CL
)
Drain Voltage
Source Voltage
Time
Time
BAT
Drain-to-Source Clamp
Voltage (V
CL
=
45
V)
Drain Current
(I
D
= 0.3 A)
GND
GND
VS
Drain-to-Source ON
Voltage (V
DS(ON)
)
Drain-to-Source ON
Voltage (V
DS(ON)
)
Current
Area (I
A
)
Source Current
(I
S
= 0.3 A)
Source Clamp Voltage
(V
CL
= -15 V)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCZ33879AEK/R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Configurable Octal Serial Switch with Open Load Detect Current Disable |
| MCZ33879AEKR2 | 功能描述:電源開關(guān) IC - 配電 CONFIG OCTAL SERIAL SW RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33879EK | 功能描述:電源開關(guān) IC - 配電 CONFIG OCTAL SERIAL SW RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33879EK/R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Configurable Octal Serial Switch with Open Load Detect Current Disable |
| MCZ33879EKR2 | 功能描述:電源開關(guān) IC - 配電 CONFIG OCTAL SERIAL SW RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
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