33810_11 Datasheet, PDF (16/37 Pages) Freescale Semiconductor, Inc – Automotive Engine Control IC Quad injector driver with Parallel/SPI control

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 50μA 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
16
Analog Integrated Circuit Device Data
Freescale Semiconductor