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參數(shù)資料
| 型號： | MCZ33094EGR2 |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 5/24頁 |
| 文件大小： | 0K |
| 描述： | IC IGNITION CONTROL 12V 16-SOIC |
| 標(biāo)準包裝： | 1,000 |
| 應(yīng)用： | 自動 |
| 電源電壓： | 6 V ~ 16 V |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC W |
| 包裝： | 帶卷 (TR) |
| 安裝類型： | 表面貼裝 |
Analog Integrated Circuit Device Data
Freescale Semiconductor
13
33094
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
The Input Voltage Comparator block requires an input
signal between ground and VBAT and detects the swing in the
input signal (VIN(-)). The thresholds for the input comparator
are approximately 56.2% of VBAT for rising signals and 36%
of VBAT for falling signals. The input signal may come from a
Hall effect sensor or reluctance sensor on the distributor.
The Negative Edge Filter block is an inverting buffer for the
signal from the Input Voltage Comparator and has a time
constant of approximately 0.1
s for rising edges and 500s
for falling edges.
The Adaptive Capacitor Charging and Sensing block
charges, discharges, and senses the adaptive capacitor
voltage. The adaptive capacitor has a single charge rate of
8.4
A and two discharge rates. The 1.688A slow discharge
rate is used only during very high VCC operation and
represents an effort to reduce excess dwell and therefore
power dissipation during high voltage operation. The 5.88
A
discharge rate is used under normal VCC operating
conditions. Under a start mode, this block will discharge the
adaptive capacitor forcing an enhanced start mode dwell.
The start/run modes are set internally by detecting the engine
frequency, which corresponds to the ramp capacitor voltage.
The Stall Capacitor Charging and Sensing block controls
the charging and discharging rates of the stall capacitor. The
charging rate is 31.5
A, and the two discharging rates are
1.0
A and 7.0A. The stall capacitor potential commands the
IC to maintain or reduce the coil current. When the engine is
turning very slowly (or stalled), the stall capacitor will have
enough time to discharge below threshold and thereby
reduce coil current. The output current limiter forces the coil
current to be proportional to the stall capacitor voltage when
the stall capacitor voltage is less than 2.0V.
The Ramp Capacitor Charging and Sensing block charges
the ramp capacitor at approximately 8.4
A and discharges it
at about 33.6
A. The charging circuit is always on and
sources current during the “not 25%” part of the engine cycle.
The discharging circuit is only on and sinking current during
the “25%” part of the engine cycle. The positive edge of the
distributor input signal sets the 25% mode, and the ramp
comparator output clears this mode.
The CR > CA Adaptive Comparator block signals the point
where the ramp capacitor voltage is greater than the adaptive
capacitor voltage. The point at which the two capacitor
voltages are equal is the point where charging of the coil is
begun. The adaptive algorithm used in the IC maintains the
required excess dwell throughout all reasonable
accelerations and decelerations without causing excess coil
power dissipation, in addition, it insures that more than
adequate spark energy is available for very high engine
speeds, when excess dwell is impossible.
The Output Current Driver and Limiter block sources a
limited supply current of about 50mA to the base of the
Darlington power transistor. The Darlington will cause the coil
to conduct to about 6.5 amps and the voltage drop on the S
pin of the IC will rise to the threshold of the current limiter. The
current limiter will then hold the coil current at that level until
either a spark is commanded by the logic block, or the engine
begins to stall (causing the coil to slowly discharge).
The Internal Logic block performs the required memory
and gating functions on the IC to implement the adaptive
ignition control algorithm.
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