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參數(shù)資料
| 型號： | 33984 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Dual Intelligent High-Current Self-Protected Silicon High-Side Switch (4.0 mз) |
| 中文描述： | 雙智能大電流的自我保護(hù)硅高邊開關(guān)（4.0mз） |
| 文件頁數(shù)： | 22/28頁 |
| 文件大?。?/td> | 492K |
| 代理商： | 33984 |
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33984
22
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Fault Mode
The 33984 indicates the following faults as they occur by
driving the
FS
terminal to logic [0]:
Overtemperature fault
Open load fault
Overcurrent fault (high and low)
Overvoltage and undervoltage fault
The
FS
terminal will automatically return to logic [1] when the
fault condition is removed, except for Overcurrent and in some
cases Undervoltage.
Fault information is retained in the fault register and is
available (and reset) via the SO terminal during the first valid
SPI communication (refer to
Table 9
, page 20).
Overtemperature Fault (Non-Latching)
The 33984 incorporates overtemperature detection and
shutdown circuitry in each output structure. Overtemperature
detection is enabled when an output is in the ON state.
For the output, an overtemperature fault (OTF) condition
results in the faulted output turning OFF until the temperature
falls below the T
SD(HYS)
. This cycle will continue indefinitely until
action is taken by the MCU to shut OFF the output, or until the
offending load is removed.
When experiencing this fault, the OTF fault bit will be set in
the status register and cleared after either a valid SPI read or a
power reset of the device.
Overvoltage Fault (Non-Latching)
The 33984 shuts down the output during an overvoltage fault
(OVF) condition on the V
PWR
terminal. The output remains in
the OFF state until the overvoltage condition is removed. When
experiencing this fault, the OVF fault bit is set in the bit OD1 and
cleared after either a valid SPI read or a power reset of the
device.
The overvoltage protection and diagnostic
can be disabled
trough SPI (bit OV_dis).
Undervoltage Shutdown (Latching or Non-Latching)
The output latches OFF at some battery voltage between
5.0 V and 6.0 V. As long as the V
DD
level stays within the
normal specified range, the internal logic states within the
device will be sustained. This ensures that when the battery
level then returns above 6.0 V, the device can be returned to
the state that it was in prior to the low V
PWR
excursion. Once the
output latches OFF, the outputs must be turned OFF and ON
again to re-enable them. In the case
IN1:IN0 = 0, this fault is
non-latched.
The undervoltage protection and diagnostic
can be disabled
through SPI (bit UV_dis).
Open Load Fault (Non-Latching)
The 33984 incorporates open load detection circuitry on
each output. Output open load fault (OLF) is detected and
reported as a fault condition when that output is disabled (OFF).
The open load fault is detected and latched into the status
register after the internal gate voltage is pulled low enough to
turn OFF the output. The OLF fault bit is set in the status
register. If the open load fault is removed, the status register will
be cleared after reading the register.
The open load protection can be disabled trough SPI (bit
OL_dis).
Overcurrent Fault (Latching)
The device has eight programmable overcurrent low
detection levels (I
OCL
) and two programmable overcurrent high
detection levels (I
OCH
) for maximum device protection. The two
selectable, simultaneously active overcurrent detection levels,
defined by I
OCH
and I
OCL
, are illustrated in
Figure 4
, page 13.
The eight different overcurrent low detect levels (I
OCL0
:I
OCL7
)
are likewise illustrated in
Figure 4
.
If the load current level ever reaches the selected
overcurrent low detect level and the overcurrent condition
exceeds the programmed overcurrent time period (t
OCx
), the
device will latch the effected output OFF.
If at any time the current reaches the selected I
OCH
level,
then the device will immediately latch the fault and turn OFF the
output, regardless of the selected t
OCL
driver.
For both cases, the device output will stay off indefinitely until
the device is commanded OFF and then ON again.
Reverse Battery
The output survives the application of reverse voltage as low
as -16 V. Under these conditions, the output’s gates are
enhanced to keep the junction temperature less than 150°C.
The ON resistance of the output is fairly similar to that in the
Normal mode. No additional passive components are required.
Ground Disconnect Protection
In the event the 33984 ground is disconnected from load
ground, the device protects itself and safely turns OFF the
output regardless the state of the output at the time of
disconnection.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 33984B | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Dual Intelligent High-Current Self Protected Silicon High-Side Switch (4.0 mohm) |
| 33984B_09 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Dual Intelligent High-current Self-protected Silicon High Side Switch (4.0 mΩ) |
| 33984B_10 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Dual Intelligent High-current |
| 33984C | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Dual Intelligent High-current Self-protected Silicon High Side Switch (4.0 mΩ) |
| 33-987-BU | 制造商:GC Electronics 功能描述: |
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