33480 datasheet(25/39 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33480

PROTECTION AND DIAGNOSIS FEATURES

Figure 12. Faults management in Fail Mode (for OUT[1:5] only)

Diagnosis

Open Load

The 33480 provides open load detection for each output

(OUT1:OUT5) when the output terminal is in the ON state.

Open load detection levels can be chosen by SPI to detect a

standard bulb, a Xenon bulb for OUT2 only, or LEDs (OLLED

bit). Open load for LEDs only is detected during each regular

switch-off transition for minimum 200µs (PWM depending

D[6:0] bits <> 7F) or periodically each tOLLED (fully-on,

D[6:0]=7F). To detect OLLED in fully on state, the output

must be on at least tOLLED. When an open load has been

detected, the output stays ON.

To delatch the diagnosis, the condition should be removed

and SPI read operation is needed (OL bit). In case of Power

on Reset on Vbat, the fault will be reset.

Current Sense

The 33480 diagnosis for load current (OUT1:6) is done

using the current sense (CSNS) terminal connected to an

external resistor. The routing of the current sense sources is

SPI programmable (MUX[2,0] bits).

OFF

out: OFF

autorestart=0

OCHI1

out: external

OCHI2

out: external

OCLO

out: external

(external_ON=1)

(t>tOCHI1) and (autorestart=0)

OFF-latched

State

OFF Autorestart

out: OFF

autorestart=1

(OT=1) or

(OCHI1=1)

(OT=1)

(t>tOCHI2) and (autorestart=0)

(UV=1) or (OCHI2=1)

(OCLO=1) or

(UV=1)

(t>tOCHI1_AUTO) and (autorestart=1)

(UV=1)

(t>tautorestart) and

(UV*=0)

(UV=1)

and

(external_on=1)

(external_ON=0)

external_ON

external

external: IGN, Flasher

external_ON: IGN_ON, Flasher_ON

Note: * See Autorestart strategy chapter.

1.4 sec min

(external_ON=0)

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