33480 datasheet(29/39 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33480

FUNCTIONAL DESCRIPTION

PROTECTION AND DIAGNOSIS FEATURES

The watchdog timeout is specified by tWDTO parameter. As

long as the WD bit (D10) of an incoming SPI message is

toggled within the minimum watchdog timeout period

(WDTO), the device will operate normally. If an internal

watchdog timeout occurs before the WD bit is toggled, the

device will revert to Fail mode. All registers are cleared. To

exit the Fail mode, send valid SPI communication with

WD bit = 1.

Table 9. Initialization Register

ADDRESS 00001—CONFIGURATION OL

The Configuration OL register is used to enable the open

load detection for LEDs in Normal Mode (OLLEDn in Table 8,

page 28). When bit D0 is set to logic [1], the open load

detection circuit for LED is activated for output 1. When bit D0

is set to logic [0], open load detection circuit for standard

bulbs is activated for output 1.

ADDRESS 00010

This register is not used.

ADDRESS 00011

This register is not used.

ADDRESS 01001—CONTROL OUT1

Bits D9 and D8 control the switching phases as shown in

Table 10.

Bit D7 at logic [1] turns ON OUT1. OUT1 is turned OFF

with bit D7 at logic [0]. This register allows the master to

control the duty cycle and the switching phases of OUT1. The

duty cycle resolution is given by bits D6:D0.

D7 = 0, D6:D0 = XX output OFF.

D7 = 1, D6:D0 = 00 output ON during 1/128.

D7 = 1, D6:D0 = 1A output ON during 27/128 on PWM

period.

D7 = 1, D6:D0 = 7F output continuous ON (no PWM).

ADDRESS 01010—CONTROL OUT2

Same description as OUT1.

ADDRESS 011111—CONTROL OUT3

Same description as OUT1.

ADDRESS 01100—CONTROL OUT4

Same description as OUT1.

ADDRESS 01101—CONTROL OUT5

Same description as OUT1.

SI Address

SI Data

D15

D14

D13

D12

D11

D10

PWM

sync

Xenon MUX2

MUX1

MUX0

SOA1

SOA0

x = Don’t care

D6 (PWM sync) = 0, No synchronization

D6 (PWM sync) = 1, Synchronization on CSB positive edge

D5 (Xenon) = 0, Xenon

D5 (Xenon) = 1, H7 Bulb

D4, D3, D2 (MUX2, MUX1, MUX0) = 000, No current sense

D4, D3, D2 (MUX2, MUX1, MUX0) = 001, OUT1 current sense

D4, D3, D2 (MUX2, MUX1, MUX0) = 010, OUT2 current sense

D4, D3, D2 (MUX2, MUX1, MUX0) = 011, OUT3 current sense

D4, D3, D2 (MUX2, MUX1, MUX0) = 100, OUT4 current sense

D4, D3, D2 (MUX2, MUX1, MUX0) = 101, OUT5 current sense

D4, D3, D2 (MUX2, MUX1, MUX0) = 110, External Switch current

sense

D4, D3, D2 (MUX2, MUX1, MUX0) = 111, No current sense

Table 10. Switching Phases

D9:D8

PWM Phase

0°

90°

180°

270°

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