Analog Integrated Circuit Device Data

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Freescale Semiconductor

31

07XSC200

• apply PWM clock on CLOCK input pin after maximum 200

s (min. 50s).

If the correct start-up sequence is not provided, the PWM function is not guaranteed.

5.3

Protection and Diagnostic Features

5.3.1

Protections

Over-temperature Fault

The 07XSC200 incorporates over-temperature detection and shutdown circuitry for each output structure.

• If the output command is ON: the corresponding output is latched OFF. FSB 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 auto-retry circuitry must be active,

or the corresponding output must be commanded OFF and then ON (toggling fault_control signal of corresponding output) or

For both cases, the fault register OT[0:1] bit into the status register will be set to [1]. The fault bits will be cleared in the status

register after a SPI read command.

5.3.1.1

Overcurrent Fault

The 07XSC200 incorporates output shutdown in order to protect each output structure against resistive short-circuit condition.

This protection is composed by eight predefined current levels (time dependent) to fit Xenon-HID manners by default or, 55 W

or 28 W bulb profiles, selectable separately by Xenon bit and 28W bits (as illustrated Figure 14, page 39).

In the first turn-on, the lamp filament is cold and the current will be huge. fault_control signal transition from logic [0] to [1] or an

auto-retry define this event. In this case, the overcurrent protection will be fitted to inrush current, as shown in Figure 5. This

overcurrent protection is programmable: OC[1:0] bits select overcurrent slope speed and OCHI1 current step can be removed in

case the OCHI bit is set to [1].

In Steady state, the wire harness will be protected by OCLO2 current level by default. Three other DC overcurrent levels are

available: OCLO1 or OCLO3 or OCLO4 based on the state of the OCLO[1,0] bits.

If the load current level ever reaches the overcurrent detection level, the corresponding output will latch the output OFF and FSB

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 auto-retry circuitry must be active or the corresponding output must be commanded OFF and then ON

The SPI fault report (OC[0:1] bits) is removed after a read operation.

In Normal mode using internal PWM module, the 07XSC200 incorporates also a cooling bulb filament management if OC_mode

duration, as illustrated in Figure 6. The 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.

hson signal

Over-current thresholds

PWM

fault_control

hson