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FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSIS FEATURES
PROTECTION AND DIAGNOSIS FEATURES
OUTPUT PROTECTION FEATURES
The 10XS3535 provides the following protection features:
?Protection against transients on V BAT supply line (per
ISO 7637)
?Active clamp, including protection against negative
transients on output line
?Over-temperature
?Severe and resistive Over-current
?Open Load during ON state
These protections are provided for each output (OUT1:5).
Over-temperature detection
The 10XS3535 provides over-temperature shutdown for
each output (OUT1:OUT5 ). It can occur when the output pin
is in the ON or OFF state. An over-temperature fault condition
results in turning OFF the corresponding output. The fault is
latched and reported via SPI. To delatch the fault and be able
to turn ON again the outputs, the failure condition must be
removed (T< 175 °C typically) and:
?if the device was in Normal mode, the output
corresponding register (bit D7) must be rewritten. ?
Application of complete OCHI window (OCHI1+OCHI2
during t2) depends on toggling or not toggling the D7 bit.
?if the device was in Fail mode, the corresponding output
is locked until restart of the device: wake up from Sleep
mode or V BATPOR1 .
The corresponding SPI fault report (OTS bit) is removed
after a read operation.
Over-current detections
The 10XS3535 provides intelligent over-current shutdown
(see Figure 12 ) in order to protect the internal power
transistors and the harness in the event of overload (fuse
characteristic).
Output current
OCHI1
OCHI2
OCLO
OCHI (I OCHI1 and then I OCHI2 ) is only activated after
toggling D7 bit in Normal Mode. During the switch-on, a
severe short-circuit condition provided on the module
connector is reported as an OCHI fault. In Fail Mode, the
control of OCHI window is provided by the toggles: IGN_ON,
Flasher_ON, and FOG_ON. The current thresholds (I OCHI1 ,
I OCHI2 and I OCLO ) and the time (t 1 and t 2 ) are fixed numbers
for each driver. After t 2, OCLO current threshold is set to
protect in steady state. t 1 and t 2 times are compared to “on”
state duration (t ON ) of the output. In case of the output is
controlled in PWM mode during the inrush period, the t ON
corresponds to the sum of each “on” state duration in order to
expand dynamically the transient overcurrent profile.
OUT2 is default loaded with the Xenon profile. The use of
H7 bulbs at this output requires SPI programming (Xenon
bit).
In case of overload (OCHI1 or OCHI2 or OCLO detection),
the corresponding output is disabled immediately. The fault is
latched and the status is reported via SPI. To delatch the
fault, the failure condition must be removed and:
For OCHI1:
?if the device was in Normal Mode: the output
corresponding register (bit D7) must be rewritten D7=1.
Application of complete OCHI window depends on
toggling or not toggling D7 bit.
?if the device was in Fail Mode, the failure is locked until
restart of the device: wake up from Sleep Mode or
V BATPOR1 .
For OCHI2 and OCLO:
?if the device was in Normal Mode: the output
corresponding register (bit D7) must be rewritten D7=1.
Application of complete OCHI window depends on
toggling or not toggling D7 bit.
?if the device was in Fail Mode, Autorestart is activated.
The device Autorestart feature provides a fixed duty
cycle and fixed period with OCHI1 window. ?
Autorestart feature resets OCHI2 or OCLO fault after
corresponding Autorestart period.
The SPI fault reports are removed together after a read
operation:
- OC bit=(OCHI1) or (OCHI2) fault
- OVL bit=(OCHI1) or (OCHI2) or (OCLO) fault
Overvoltage detection and active clamp
t1
t2
time
The 10XS3535 provides an active gate clamp circuit in
order to limit the maximum drain to source voltage.
Figure 12. Double Over-current Window in Normal Mode
In case of overload on an output the corresponding switch
(OUT[1 to 5]) is turned off which leads to high voltage at
MC10XS3535
Analog Integrated Circuit Device Data ?
34
Freescale Semiconductor
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