33810 datasheet(16/37 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33810

FUNCTIONAL DESCRIPTION

FUNCTIONAL PIN DESCRIPTION

LOW SIDE INJECTOR DRIVER OUTPUT (OUT0 -

OUT3)

OUT0 - OUT3 are the Open drain low side (Injector) driver

outputs. The drain voltage is actively clamped during turn off

of inductive loads. These outputs can be connected in

parallel for higher current loads provided the turn off energy

rating is not exceeded.

RESISTOR SENSE POSITIVE (RSP)

Resistor Sense Positive - Positive input of a current sense

amplifier. The ignition coil current is monitored by sensing the

voltage across an external resistor connected between RSP

and RSN. The output of the current sense amplifier feeds the

inputs of the NOMI and MAXI comparators.

Note: RSN and RSP must be grounded in V10 mode.

RESISTOR SENSE NEGATIVE (RSN)

Resistor Sense Negative - Negative input of a current

sense amplifier. The ignition coil current is monitored by

sensing the voltage across an external resistor connected to

RSP and RSN. The output of the current sense amplifier

feeds the inputs of the NOMI and MAXI comparators.

Note: RSN and RSP must be grounded in V10 mode.

NOMINAL IGNITION COIL CURRENT (NOMI)

Nominal ignition coil current output flag. This output is

asserted when the output current exceeds the level selected

by the DAC.

NOMI can be configured as an input pin for V10 mode

applications where the gate drive needs to be latched off by

another device’s MAXI current sense amplifier output. The

NOMI input will latch off gate drivers 5 and 6 when configured

as a V10 mode ignition gate driver See Figure 10.

SPARK DURATION OUTPUT (SPKDUR)

SPKDUR is the Spark Duration output. This open drain

output is low while feedback inputs FB0 through FB3 are

above the programmed spark detection threshold. This

output indicates an ignition flyback event. Each feedback

input (FB0 - FB3) is logically OR'd to drive the SPKDUR

output. There is a 50

μA pull up current source connected

internally to the SPKDUR pin.

MAXIMUM IGNITION COIL CURRENT (MAXI)

Maximum ignition coil current output flag. This output is

asserted when the output ignition coil current exceeds the

selected level of the DAC. This signal also latches off the gate

drive outputs when configured as an ignition gate driver. The

MAXI current level is determined by the voltage drop across

an external sense resistor connected to pins RSP and RSN.

MAXI can be configured as an input pin for V10

applications where the gate drive needs to be latched off by

another devices MAXI current sense amplifier output. The

MAXI input will latch off gate drivers 7 and 8 when configured

as ignition gate drive outputs See Figure 10.

DRIVER INPUT (DIN0-DIN3), GATE DRIVER INPUT

(GIN0-GIN3)

Parallel input pins for OUT0-OUT3 low side drivers and

GD0-GD3 gate drivers. Each parallel input control pin is

active high and has an internal pull-down current sink. The

parallel input data is logically OR’d with the corresponding

SPI input data register contents, except for the ignition mode

IGBT drivers. They are only controlled by the parallel inputs

GIN0-GIN3. In GPGD mode, GIN0-GIN3 are logically OR’d

with SPI input data. All outputs are disabled when the

OUTEN pin is HIGH, regardless of the state of the command

inputs.

33810 Datasheet(PDF) 16 Page - Freescale Semiconductor, Inc

33810 Datasheet(HTML) 16 Page - Freescale Semiconductor, Inc

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