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參數(shù)資料
| 型號： | MC33999 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 16-Output Switch with SPI and PWM Control |
| 中文描述： | 16 - SPI和輸出的PWM控制開關(guān) |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 627K |
| 代理商： | MC33999 |
33999
14
Go to: www.freescale.com
Each 33999 output has an internal 50
μ
A pull-down current
source. The pull-down current is disabled on power-up and
must be enabled for Open Load Detect to function. Once
enabled, the 33999 will only shut down the pull-down current in
Sleep mode or when disabled via SPI.
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 μs to 450 μs is incorporated. The duration for which a
false fault may be reported 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 must time out before the fault comparator is
enabled to detect a faulted threshold. Once the condition
causing the Open Load Fault is removed, the device resumes
normal operation. The Open Load Fault, however, will be
latched in the output SO Response 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 by an output
experiencing a current greater than the current limit.
Three safety circuits progressively in operation during load
short conditions afford system protection:
1. The device’s output current is monitored in an analog
fashion using a SENSEFET approach and is current
limited.
2. With the output in current limit, the drain-to-source
voltage increases. By setting the SFPD bit to 0, the
output shuts down on V
DS
> 2.7 V typical after 450
μ
s.
3. The output thermal limit of the device is sensed and,
when attained, causes only the specific faulted output to
shut down. The device remains OFF until cooled. The
device then operates as programmed by the shutdown/
retry bit. The cycle continues until the fault is removed or
the command bit instructs the output OFF.
All three protection schemes set the Fault Status bit (bit 23 in
the SO Response register) to logic [1].
Undervoltage Shutdown
An undervoltage SO
PWR
condition results in the global
shutdown of all outputs and reset of all control registers. The
undervoltage threshold is between 2.0 V and 3.0 V.
An undervoltage condition at the VPWR pin results in an
output shutdown and reset. The undervoltage threshold is
between 3.2 V and 3.5 V. When V
PWR
is between 5.0 V and
3.5 V, the output may operate per the command word and the
status is reported on SO pin, though this is not guaranteed.
Output Voltage Clamp
Each output of the 33999 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 50 V. 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 7
).
Characterization of the output clamps, using a single pulse
non-repetitive method at 0.3 A, indicates the maximum energy
to be
50 mJ at 150
°
C
junction temperature per output.
Figure 7. Output Voltage Clamping
Reverse Battery Protection
The 33999 device requires external reverse battery
protection on the VPWR pin.
All outputs consist of a power MOSFET with an integral
substrate diode. During reverse battery condition, current will
flow through the load via the substrate diode. Under this
circumstance relays may energize and lamps will turn on. If load
reverse battery protection is desired, a diode must be placed in
series with the load.
Overtemperature Fault
Overtemperature Detect circuits are specifically incorporated
for each individual output. The shutdown following an
overtemperature condition depends on the control bit set in the
Retry/Shutdown Control register. Each independent output
shuts down at 155
°
C
to 180
°
C
. When an output shuts down due
to an Overtemperature Fault, no other outputs are affected. The
MCU recognizes the fault by a logic [1] in the Fault Status bit
(bit 23 in the SO Response register). After the 33999 has
cooled below the switch point temperature and 10
°
C
hysteresis,
the output functions as defined by the retry/shutdown bit 17 in
the Global Shutdown/Retry Control register.
Current
Area (I
A
)
(E
J
= I
A
CL
)
Drain Voltage
Time
Drain-to-Source Clamp
Voltage (V
CL
= 50 V)
D
(I
D
= 0.3 A)
GND
DS(O N)
)
Voltage (V
)
Drain-to-Source ON
CClamp Energy
(E
J
= I
A
x x V
CL
)
(I
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC33999EK | 功能描述:多路器開關(guān) IC 16 LOW SIDE PWM&SPI RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MC33999EK | 制造商:Freescale Semiconductor 功能描述:IC SWITCH 16 OUT SPI/PWM 54SOIC |
| MC33999EKR2 | 功能描述:多路器開關(guān) IC 16 LOW SIDE PWM&SPI RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MC3399DW | 制造商: 功能描述: 制造商:undefined 功能描述: |
| MC340 | 制造商:Motorola Inc 功能描述:Bipolar Junction Transistor, NPN Type, TO-126 |
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