33480 datasheet(19/39 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33480

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

SLEEP MODE

The Sleep mode is the default mode of the 33480. This is

the state of the device after first applying battery voltage

(VBAT) and prior to any I/O transitions. This is also the state

of the device when IGN, FLASHER, and RSTB are logic [0]

(wake=0). In the Sleep mode, the outputs and all internal

circuitry are OFF to minimize current draw. In addition, all

SPI-configurable features of the device are reset. The 33480

will transit to two modes (Normal and Fail) depending on

wake and fail signals (see Fig13).

The transition to the other modes is according following

signals :

• Wake = IGN or IGN_ON or FLASHER or

FLASHER_ON or RSTB

• Fail = VCC fail or SPI fail or External limp

NORMAL MODE

The 33480 is in Normal mode when:

• Wake = 1

• Fail = 0

In Normal operating mode the power outputs are under full

control of the SPI as follows:

• The outputs 1 to 6, including multiphase timing, are

controlled by the programmable PWM module.

• The outputs 1 to 5 are switched OFF in case of

undervoltage on Vbat.

• The outputs 1 to 5 are protected by the overcurrent

double window and overtemperature shutdown circuit.

• The digital diagnosis feature transfers status of the

smart outputs via SPI.

• The analog current sense output (current recopy

feature) can be routed by SPI.

• The SPI reports NM=1 in this mode.

The figure below describes the PWM, outputs and

overcurrent behavior in Normal Mode.

FAIL MODE

The 33480 is in Fail mode when:

• Wake = 1

• Fail = 1.

In Fail mode :

• The outputs are under control of external terminals (see

Table 5)

• The outputs are fully protected in case of overload,

overtemperature and undervoltage (on Vbat or on Vcc).

• Neither digital diagnosis feature (SPI) nor analog

current sense are available.

• Output 2 is configured in Xenon mode.

• In case of overload (OCHI2 or OCLO) conditions or

undervoltage on Vbat, the outputs are under control of

autorestart feature.

• In case of serious overload condition (OCHI1 or OT) the

corresponding output is latched OFF until a new wake

up event (wake=0 then 1).

Table 5. Limp Home Output State

Overcurrent

Output

D0-D6 bits

D7 bit

Overcurrent

OUT[1,2]

IGN (external)

IGN_ON

1.4 sec min

Output 1

Parking Light

Output 2

Low Beam

Output 3

High Beam

Output 4

Fog Light

Output 5

Flasher

External Switch

Spare

IGN Terminal

OFF

FLASHER Terminal

OFF

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