MC33882DHR2 Freescale, MC33882DHR2 Datasheet - Page 19

• Manufacturer Part Number: MC33882DHR2
• Manufacturer: Freescale

Specifications of MC33882DHR2

• Switch Type: Low Side
• Power Switch Family: MC33882
• Input Voltage: -0.3 to 7.3V
• Power Switch On Resistance: 400mOhm
• Output Current: 3A
• Number Of Outputs: 8
• Mounting: Surface Mount
• Supply Current: 7.5mA
• Package Type: HSOP
• Operating Temperature (min): -40C
• Operating Temperature Classification: Automotive
• Pin Count: 32
• Lead Free Status / RoHS Status: Compliant

MODE Operation
either the Serial Input control bits or the parallel input pins. If
the
• Serial input control is disabled.
• Parallel input pins IN0 to IN5 are ignored.
• The SO pin is tri-stated.
are controlled by the IN0 & IN1, IN2 & IN3, and IN4 & IN5
pins, respectively. When a 10 kΩ pull-up resistor is used, a
logic high on the
flagged by the SPI when all bits are returned as logic [1]s.
control of outputs, data can still be clocked into the serial
input register. This allows programming of a desired state for
the outputs taking effect only when the
logic low. For applications using the SO pin, daisy chaining is
permitted, but if the
first IC in a daisy chain is not possible because the serial
outputs are tri-stated.
Output Drivers
clamped, low-side switches driving 1.0 A typical or less loads.
The low-power OUT6 and OUT7 outputs are unclamped low-
side switches driving 30 mA typical or less loads. All outputs
are individually protected from short circuit or short-to-battery
conditions and transient voltages. The outputs are also
protected by short circuit device shutdown. Each output
individually detects and reports open load /short-to-ground
and short circuit /short-to-battery faults.
Fault Sense / Protection Circuitry
to-ground while the output is OFF. OUT0 to OUT5 may also
be programmed via SPI bits 6 and 7 to detect open loads and
shorts-to-ground while the output is ON. Whenever a short or
open fault condition is present on a particular output channel,
its fault bit in the internal fault register indicates the fault with
a logic [1].
register is read, then it returns to a logic [0], indicating a
normal condition. When the
communication, the fault bits in the internal fault register
latch, preventing erroneous status transmissions and the
forthcoming communication reports this latched fault status.
The SO pin serial output data for 8-bit SPI mode are the fault
status register bits.
a transmitted double command provides the fault byte
followed by the first byte of the double command, becoming
a command verification. The status is sent back to the IC for
fault monitoring. Diagnostic interpretation of the following
fault types can be accomplished using the procedure
described in the paragraph entitled
Diagnostics, page 20:
short-to-battery while the output is ON and open load /short-
Analog Integrated Circuit Device Data
Freescale Semiconductor
During normal operation output channels are controlled by
OUT0 and OUT1, OUT2 and OUT3, and OUT4 and OUT5
Although a logic high on the
The high-power OUT0 to OUT5 outputs are active
Each output channel individually detects shorted loads /
When a fault ends, its fault bit remains set until the SPI
For 16-bit SPI mode and SO pin (non-daisy chained) use,
MODE
pin is pulled high:
MODE
MODE
pin or an open serial output pin is
pin is high, writing to other than the
CS
MODE
pin is pulled low for serial
Extensive Fault
pin disables serial
MODE
pin returns to a
• Communication error
• Open load /short-to-ground
• Short-to-battery or short circuit
high, opening the fault status register to new fault information
and tri-stating the SO pin.
• A short circuit or short-to-battery on a particular output will
• A short circuit condition causes all channels to shut down,
must last a specified time (fault sense time or fault mask
time). This prevents any normal switching transients from
causing inadvertent fault status indications.
outside the 9.0 V to 17 V range. The fault reporting may
appear to function properly but may not be 100 percent
reliable.
Short Circuit /Short-to-Battery Sensing and Protection
reached, the current remains at the limit until the short circuit
sense time, t
will shut down and its fault status bit switches to a logic [1].
The output goes into a low duty cycle operation as long as the
short circuit condition exists and the input to that channel is
ON.
If a short occurs after the output is ON, the fault sense time
indicates the fault and enters the low duty cycle mode at
much less than t
driver from exceeding its thermal capabilities. When the short
is removed, the driver resumes normal operation at the next
retry, but the fault status bit does not return to a normal
logic [0] state until it is read from the SPI. When the
this device is pulled low, the fault status bits are latched, after
which any new fault information is not a part of this serial
communication event.
required to protect the output. It is possible to override this
duty cycle if the input signal (parallel or SPI) turns the channel
ON and OFF faster than 10 kHz. For this reason control
signals should not exceed this frequency.
Open Load / Short-to-Ground While Off Sensing
Detection Voltage at turn OFF for a period of time exceeding
the Open Load Sense Time, the fault status bit for this output
switches to a logic [1].
Voltage threshold when the output has been OFF, a fault is
indicated with a delay much less than the Open Load Sense
Time. When the fault is removed, normal operation resumes
and the fault status bit will return to a normal logic [0] state.
Two fault conditions initiate protective action by the device:
cause that output to go into a low duty cycle operation until
the fault condition is removed or the input to that channel
turns OFF.
ignoring serial and parallel inputs to the device.
To be detected and reported as a fault, a fault condition
Fault status information should be ignored for V
When an output is turned ON, if the drain current limit is
This duty cycle is defined by the sense and refresh times.
The low duty cycle operation for a short circuit condition is
If the drain voltage falls below the Open Load OFF
If a drain voltage falls below the Open Load OFF Detection
When serial communication is ended, the
SS
, has elapsed. At this time, the affected output
SS
. The duty cycle is low enough to keep the
FUNCTIONAL PIN DESCRIPTION
FUNCTIONAL DESCRIPTION
CS
pin returns
BAT
CS
levels
pin of
33882
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