MCZ33810EK Freescale Semiconductor, MCZ33810EK Datasheet - Page 20

• Manufacturer Part Number: MCZ33810EK
• Description: IC IGNITION INJECTOR 32-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MCZ33810EK

• Applications: Automotive
• Current - Supply: 10mA
• Voltage - Supply: 4.5 V ~ 36 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-SOIC (7.5mm Width) Exposed Pad, 32-eSOIC, 32-HSOIC
• Product: Fan / Motor Controllers / Drivers
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

• Secondary clamp (secondary clamp bit)
• Soft shutdown enable (SoftShutDn bit)
• Ignition ignition coil current amplifier gain (Gain Sel bit)
• Overlapping dwell disable (Overlap Dwell Disable bit)
• Maximum dwell enable (MaxDwellEn bit)
• Maximum dwell timer (MaxDwellTimer bits)
• End of spark filter timer value
Table 20
Purpose Gate Drivers are not affected by the Spark
Commands.
SPARK DURATION SIGNAL
flow to the end of current flow across the spark plug gap.
Because the extremely high-voltage ignition coil secondary
output is difficult to monitor, corresponding lower voltage
signals generated on the ignition coil primary are often used.
The FBx pins monitor the ignition coil primary voltage (IGBT
Collector) through a 10 to 1 voltage divider. When the IGBT
is disabled, the rise in the FBx signal indicates a sparkout
condition is occurring at the spark plug gap.
duration to be V
on the collector of the IGBT. The spark duration falling edge
reference is programmable via SPI through the End Spark
Threshold bits 0 and 1 (See
and spark duration indicated.
20
33810
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Spark Command address and data bits are listed in
NOTE: Gate driver outputs programmed to be General
The Spark Duration is defined as the beginning of current
The device considers the initial thresholds for spark
Figure 5
Channel 1: GINx IGBT Gate Drive
Channel 2: IGBT Collector Voltage
Channel 3: IGBT Current @ 5.0A/Div
Figure 5.
illustrates a typical ignition event with dwell time
IH
Ignition Coil Charge and Spark Event
DWELL Time
= V
PWR
+ 21 V for rising edge as measured
Table
7).
Ignition Coil Current,
SPKDUR~3.0ms
5.0A/div
Default settings
Begin spark threshold V
End spark threshold V
MCU timer/input capture port to determine the actual spark
duration. Spark duration information is then used by the MCU
spark control algorithm to optimize the dwell time.
OPEN SECONDARY TIMER
be determined by waveforms established on the ignition coil
primary during a spark event. The spark event is initiated by
the turn off of the IGBT. The voltage on the collector of the
IGBT rises up to the IGBT’s internal collector to gate clamp
voltage (typically 400 volts). Collector to gate clamp events
normally last 5.0 to 50μs. In an open ignition coil secondary
fault condition, the collector to gate clamp event lasts much
longer. The oscilloscope waveform in
compare a normal spark signature with that of an open
secondary fault condition signature.
Table 7. End Spark Threshold
Spark Command
V
The pulse width of the SPKDUR signal is measured by the
A fault due to open in the ignition coil secondary circuit can
PWR
Bit<b1,b0>
00
01
10
11
= 16.0V
Figure 6. Normal Spark Event
IL
Analog Integrated Circuit Device Data
IH
= V
= V
End Spark Threshold (VIL)
PWR
PWR
+5.5V
VPWR + 2.75
VPWR + 11.0
VPWR + 5.5
VPWR + 8.2
+ 21V
Freescale Semiconductor
Figure 6
and
Figure 7