MC35XS3400CPNA Freescale, MC35XS3400CPNA Datasheet - Page 26

• Manufacturer Part Number: MC35XS3400CPNA
• Manufacturer: Freescale

Specifications of MC35XS3400CPNA

• Switch Type: High Side
• Power Switch Family: MC35XS3400
• Input Voltage: 4 to 28V
• Power Switch On Resistance: 170mOhm
• Output Current: 6A
• Number Of Outputs: 4
• Mounting: Surface Mount
• Supply Current: 6.5mA
• Package Type: PQFN
• Operating Temperature (min): -40C
• Operating Temperature Classification: Automotive
• Pin Count: 24
• Lead Free Status / RoHS Status: Compliant

PROTECTIONS
Over-temperature Fault
and shutdown circuitry for each output structure.
temperature is higher than T
register will be set to [1]. The fault bits will be cleared in the
status register after a SPI read command.
Over-current Fault
protect each output structure against resistive short-circuit
condition. This protection is composed by eight predefined
current levels (time dependent) to fit 28 W bulb profiles.
will be huge. fault_control signal transition from logic [0] to [1]
or an autoretry define this event. In this case, the over-current
protection will be fitted to inrush current, as shown in
Figure
OC[1:0] bits select over-current slope speed and OCHI1
current step can be removed in case the OCHI bit is set to [1].
OCLO2 current level by default. Three other DC over-current
levels are available: OCLO1 or OCLO3 or OCLO4 based on
the state of the OCLO[1,0] bits.
26
35XS3400
FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSTIC FEATURES
The 35XS3400 incorporates over-temperature detection
Two cases need to be considered when the output
The 35XS3400 incorporates output shutdown in order to
In the first turn-on, the lamp filament is cold and the current
In steady state, the wire harness will be protected by
•If the output command is ON: the corresponding output is
•If the output command is OFF: FS will go to logic [0] until
For both cases, the fault register OT[0:3] bit into the status
hson signal
PWM
fault_control
hson
Over-current thresholds
latched OFF. FS will be also latched to logic [0]. To
delatch the fault and be able to turn ON again the
outputs, the failure condition must disappear and the
autoretry circuitry must be active or the corresponding
output must be commanded OFF and then ON (toggling
fault_control signal of corresponding output) or
V
the corresponding output temperature will be below
T
SD
SUPPLY(POR)
5. This over-current protection is programmable:
.
condition if V
SD
:
DD
= 0.
PROTECTION AND DIAGNOSTIC FEATURES
detection level, the corresponding output will latch the output
OFF and FS will be also latched to logic [0]. To delatch the
fault and be able to turn ON again the corresponding output,
the failure condition must disappear and the autoretry
circuitry must be active or the corresponding output must be
commanded OFF and then ON (toggling fault_control signal
of corresponding output) or V
V
operation.
35XS3400 also incorporates a cooling bulb filament
management, if the OC_mode is set to logic [1]. In this case,
the 1
to the previous OFF duration, as illustrated in
following figure illustrates the current level will be used in
function to the duration of previous OFF state (toff). The slope
of cooling bulb emulator is configurable with OCOFFCB[1:0]
bits.
Severe Short-Circuit Fault
protect each output in case of severe short-circuit during of
the output switching.
will latch the output OFF, FS will go to logic [0] and the fault
register SC[0:3] bit will be set to [1]. To delatch the fault and
be able to turn ON again the outputs, the failure condition
must disappear and the corresponding output must be
commanded OFF, and then ON (toggling fault_control signal
of corresponding output) or V
V
operation.
DD
DD
If the load current level ever reaches the over-current
The SPI fault report (OC[0:3] bits) is removed after a read
In Normal mode using the internal PWM module, the
The 35XS3400 provides output shutdown in order to
If the short-circuit impedance is below
The SPI fault report (SC[0:3] bits) is removed after a read
hson
PWM
hson signal
fault_control
= 0.
Over-current thresholds
= 0.
st
step of multi-step over-current protection will depend
Analog Integrated Circuit Device Data
Cooling
toff
SUPPLY(POR)
SUPPLY(POR)
Depending on toff
depending to toff
Freescale Semiconductor
R
condition if
condition, if
SHORT
Figure
,
the device
6. The