MCZ33800R2 FREESCALE [Freescale Semiconductor, Inc], MCZ33800R2 Datasheet - Page 35

• Manufacturer Part Number: MCZ33800R2
• Description: Engine Control Integrated Circuit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Output OFF Open Load Fault
reporting of an open load when the corresponding output is
disabled (input bit programmed to a logic low state). The
Output OFF Open Load Fault is detected by comparing the
drain-to-source voltage of the specific MOSFET output to an
internally generated reference. Each output has one
dedicated comparator for this purpose.
resistor. The pull-down current sources are enabled on
power-up and must be enabled for Open Load Detect to
function. In cases were the Open Load Detect current is
disabled, the status bit will always respond with logic 0. The
device will only shut down the pull-down current in Sleep
Mode or when disabled via the SPI.
a false Output OFF Open Load Fault may be triggered. To
prevent this false fault from being reported, an internal fault
filter of 100µs to 450µs is incorporated. The duration for
which a false fault may be reported is a function of the load
impedance, R
supply voltage, V
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.
Under-voltage Shutdown
shutdown of all outputs and reset of all control registers. The
under-voltage threshold is between 0.8 and 2.8V.
global shutdown of all outputs and reset of all control
registers. The under-voltage threshold is between 3.0 and
4.4V
per the command word, however status reported on SO pin
is not guaranteed and performance may be out of
specification limits.
Analog Integrated Circuit Device Data
Freescale Semiconductor
An Output OFF Open Load Fault is the detection and
Each output has an internal pull-down current source or
During output switching, especially with capacitive loads,
An under-voltage condition on V
An under-voltage condition on V
Low-voltage condition (4.4V< V
DS(ON)
PWR
, C
. The rising edge of
OUT
of the MOSFET, as well as the
PWR
DD
PWR
results in the global
<9.0V) will operate
also results in the
CS
triggers the built-
TYPICAL APPLICATIONS
INTRODUCTION
Output Voltage Shutdown
permanent damage to the 33800. Over-voltage on the VPWR
pin will cause the 33800 to shut down until the voltage returns
to a normal value. Over voltage exceeding the maximum
recommended voltage (45V) may cause permanent damage
to the 33800.
Output Voltage Clamp
clamp to provide fast turn-OFF and transient protection of
each output. Each clamp independently limits the drain-to-
source voltage to 50V. The total energy clamped (E
calculated by multiplying the current area under the current
curve (I
non-repetitive method at 0.3A, indicates the maximum
energy to be 50mJ at 150°C junction temperature per output.
Reverse Battery Protection
protection on the VPWR pin.
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.
Drain-to-Source ON
Voltage (V
Drain-to-Source ON
Voltage (V
An over voltage condition on VDD (> 7.0) may result in
Each output of the 33800 incorporates an internal voltage
Characterization of the output clamps, using a single pulse
.
The 33800 device requires external reverse battery
All outputs consist of a power MOSFET with an integral
Drain-to-Source Clamp
Voltage (V
Drain Current
(I
A
Drain-to-Source C lamp
Voltage (V
Drain Current
(I
D
) times the clamp voltage (V
D
= 0.3A)
DS (O N)
= 0.3 A)
DS(ON)
Figure 10. Output Voltage Clamping
CL
GND
)
GND
CL
= 50V)
)
= 45 V)
50V)
Curren t
Area (I
A
)
TYPICAL APPLICATIONS
CL
) (see
Drain Voltage
Drain Voltage
Clamp Energy
(E
Clamp Energy
(E
J
= I
J
INTRODUCTION
Figure
= I
A
x V
A
x V
CL
J
) can be
CL
)
Time
10).
Time
)
33800
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