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IL1815 Schematic ( PDF Datasheet ) - Integral

Teilenummer IL1815
Beschreibung AMPLIFIER IC FOR SENSORS WITH DIFFERENT CONDUCTANCE
Hersteller Integral
Logo Integral Logo 




Gesamt 8 Seiten
IL1815 Datasheet, Funktion
IL1815
AMPLIFIER IC FOR SENSORS WITH DIFFERENT CONDUCTANCE
Functional Description
Designed IC is an integrated circuit (IC) of the
amplifier for sensors with different conductance.
IL1815 – is an IC of adaptive amplifier
increasing analog signal from the sensor and
transmitting a strobe of pulses from IC output
into electrical circuit of motor engine control
device. The amplifier ensures one short output
pulse leading edge of which coincides with
negative half-wave, crossing zero of input
analog signal produced by alternating magnetic
field of inductive sensor coil.
TA = –40 ÷ +125°С
Functions
IC is purposed for application in automotive electronics in injection controller block as
well as in engine control system for:
crankshaft position (condition) control;
Switching when crossing zero;
engine rotation speed control;
tachometer (rotation speed measurement);
engine check (testing).
IC IL1815 is analog to microcircuit of the third integration scale and comprises 131 elements.
The circuit is implemented in 14-pin DIP-package of MS-001AA (IL1815N) type and in 14-pin SO-
package of MS-012AB (IL1815D) type.
Connection of loading of 1 kOhm to IC output (to pin 10) is tolerable.
Features
Adaptive hysteresis
One-polar power supply mode
Influence of «ground» on input
Precise choice of the initial ignition moment
Operation in the supply voltage range of 2,5 V up to 12 V
control of input (pin 3) by signal coming into external resistor with amplitude from 75 mV up to
120V.
Compatibility with CMOS - logic
1






IL1815 Datasheet, Funktion
IL1815
than 350 mV below «ground» level, current of input output 03 (right up to 3 mA) will be
sourced from supply output VP. If output VP is not shunted insufficiently from incoming
pulsation voltage, normal operation of the device on output VP will be disturbed. Similarly,
minor changes of «ground» potential appear on output 02 of the device, in consequence of
which, poor quality of equipment earth related to «ground» of input signal may cause
unreliable device operation. Thus, to ensure combined input voltage and frequency range
of IC operation it’s necessary to think over an adequate device ground connection and
avoid pulsations of supply voltage VP.
Limitation of input current.
As mentioned above, current limit for signal input (output 03) is ensured by the user by means
of external resistor R3 (fig.1). For applications where signal of input voltage is not symmetric
regarding «ground» the worst case of voltage peak may be calculated by the following formula:
R3MIN = (VIN peak) / 3 mA
(1)
In applied example shown in figure 1 ( when R3=18 KOhm ), recommended maximum input
signal voltage is ±54 V (amplitude value).
Operation of sensor actuation (detection device) when crossing zero.
LM1815 is purposed for operation as sensor of crossing zero starting unit internal counting
when input signal negative half-wave (trailing edge) crosses zero. As against other sensors of
crossing zero, LM1815 can’t be started until input signal crosses switching threshold on positive
part of waveform, only afterwards electrical circuit is connected again. The following crossings of
zero are disregarded unless switching threshold is exceeded again. This switching threshold
changes depending on connection of output 05. There can be three different operation modes.
Mode 1, output 05 is not connected (open).
In this mode when amplitude of input signal more than typical value ±75 mV and less than ±
135mV - typical value of switching threshold makes 45 mV. Under these conditions input signal
has to cross first 45 mV of switching threshold in positive direction in order to «equip» the sensor
of crossing zero, and then cross zero in negative direction to start it.
If signal amplitude is less than 30 mV (minimum in the range of electrical characteristics), short
pulse does not guarantee IC starting (switching).
Input signals with amplitude more than ±230 mV ensure switching threshold of 80% (typical
value) of input voltage peak. Capacitor of peak detector in the device on output 07 stores
(memorizes) the value regarding positive input peaks determining switching threshold. Input
signals have to exceed this switching threshold in positive direction in order to «equip» sensor of
crossing zero which operates on negative wavefront (edge) of input signal.
Pulses of peak detector change quickly according to increase in amplitude of input signal and
attenuate owing to the property of externally connected to output 07 resistor, decreasing input
signal. In case when amplitude of input signal decreases quicker than voltage stored on the
capacitor of peak detector, output signal may decrease until the voltage on capacitor becomes
very minor, equal to the «ground» level.
Note that after input voltage is fixed, waveform observed on output 03 is not identical to the one
observed on variable reactive sensor. Just as voltage stored on output 07 is not identical to pulse
(variable) voltage appears on output 03.
Mode 2, output 05 is connected to VP.
Under this mode minimum amplitude of input signal is ±200 mV. IC is started on negative wave
(edge) of input signal crossing zero, after switching threshold on positive wave (edge) of input
signal is exceeded.
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