View IL1815N_1254330.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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
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);
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 SOpackage of MS-012AB (IL1815D) type. Connection of loading of 1 kOhm to IC output (to pin 10) is tolerable.
Features
*
engine check (testing).
* * * * * * * *
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
Pin symbols. NC GND IN NC CN1 NC CN2 Pin description table. 01 02 03 04 05 06 07 Plastic DIP or SO package 14 13 12 11 10 09 08 SYN2 NC CN3 C1 GO SYN1 VP
Table of pin description in IC IL1815N (for 14-pin DIP package of MS-001AA type) and IC IL1815D (for 14-pin SO package of MS-012AB type)
Number 01 02 03 04 05 06 07 08 09 10 11 12 13 14 Symbol NC GND IN NC CN1 NC CN2 Vp SYN1 GO CI CN3 NC SYN2 Description Not connected Common output Signal input Not connected Input of sensitivity threshold control Not connected Output of capacitance peak detector Supply output from voltage source Synchronization input Gate output Choice input Reference voltage output Not connected Output of RC - synchronization
2
IL1815
Table of maximum ratings Symbol VP Ptot Tstg II Parameter Supply voltage Maximum dissipated power 1) Storage temperature Maximum chip temperature2) Input current min 2,0 -65 max 12,0 1250,0 150 125 30 Unit V mW C mA
Note: Short-term temperature rise of chip up to 150 is tolerable. Maximum absolute ratings Symbol Parameter min max Unit
VP Supply voltage 2,5 12,0 V Maximum chip temperature 125 C Table of electrical parameters (for (ambient)=25; supply voltage Vp=10 V and in compliance with connection circuit given in Fig. 1 without L1) Symbol Parameter Test conditions Target Unit min max IP Consumption current fI=500 Hz, output 09=2 V, 6,0 mA output 11=0,8 V W Width of reference pulse on fI=from 1 Hz to 2 kHz, 70,0 130,0 mks output 12 R1=150 kOhm, C1=0,001 mkF IIB Bias current of logic input VI=2 V 5,0 mkA (on outputs 09 and 11) 1) ZI Input impedance VI=5 (rms) 12,0 28,0 kOhm VCROSS Threshold of crossing zero VI =100 mV 25,0 mV (on output 03) VTL Threshold of logic input On outputs 09 and 11 0,8 2,0 V VOH High output voltage R4=1 kOhm (output 10) 7,5 V VOL Low output voltage ISINK=0,1 mA (output 10) 0,4 V VTA Input switching threshold Mode 1: output 05 is 30,0 60,0 mV open, VI 135 mV 2) Mode 1: output 05 is % from 40,0 90,0 open, U03 + PK VI 230 mV Mode 2: output 05 is 200,0 450,0 mV shorted to VP Mode 3: output 05 is -25,0 25,0 mV shorted to ground ILS Output leakage current on V12=11 V 10 mkA output 12 VSV Saturation voltage on I12=2 mA 0,4 V output 12 Note: 1) Measured with external input resistor of 18 kOhm. The circuit comprises series connected resistor of 1 kOhm with diode, connected to ground which attenuate input signal; 2) numerical value of the rate on the controlled variable VTA, is defined by percentage of U03 signal sum incoming on output 03 and PK voltage level on output 07 of peak detector.
3
IL1815
Electrical parameters ( for (ambient)=25; supply voltage Vp=10 V and in accordance with connection circuit shown in figure 1 without L1) Symbol Parameter Test conditions Target Typical value 200,0 Unit
IIS
Bias current of signal input (on output 03)
VI=0 V direct component (output 03)
nA
Signal input pin 03 pulses X X pulses
RCsynchronization pin 14 RC X X L
Table 1 - Truth table Choice input Synchronization output 11 input pin 09 L X H H H L L L
Gate output pin 10 Pulses = RC H L Crossing zero level
External loading connection circuit and preferred application circuit
Vp
t = 0,673RC
1 0,001 mkF
R1 150 kOhm
R2 5,6 kOhm
R4 1 kOhm
14
13
12
11
10
09
08
Microcircuit Decelerating controller of data transfer
+
_
_ + _ +
01
02
03 R3 18 KOhm
04
05
06
07
VI
L1
2 0,33 mkF
R5 1,6 MOhm
Functionality description
Under normal operation (function) conditions the signal synchronized by reference voltage source (from pin 12) having passed the controller of data transmission delay (see fig.1) and transformed by external electrical circuit returns into the IC. Then, logic input (pin 11) enables to choose whether synchronization signal (from clock synchronization input -
4
IL1815
pin 09) or processed input signal (from pin 03), having passed the controller of data transmission delay, for transmission to output stage of IC logic block. The amplifier is started by incoming positive threshold voltage that is generated during effect of voltage peak on output 07. This peak appears when input signal comes into output 03 of the circuit and its maximum value varies in time with input signal amplitude. Thus, input hysteresis changes with amplitude of input signal. That allows electrical circuit to perceive the signal where high-frequency noise is grater than amplitude of input signal of lower frequency. Minimum amplitude of input signal VI = 75 mV. Latching circuit of input voltage. Voltage of input signal on output 03 is internally fixed. 03 . Remaining limit of input signal on this output is ensured by external resistor R3 (see fig.1), which is to be chosen to provide maximum current (amplitude value) 3 mA in normal operation conditions.
Vp
T1
T4 R1 1kOhm T5 T3 R2 2kOhm T7 R3 1kOhm T6
T2
Output 03
Input voltage latching circuit.
Positive inputs of amplifiers (from output 03) are fixed in electrical circuit (see fig.2) by connected in series resistor R3 and diode T4 connected to ground. Therefore for changes of input signal exceeding 500 mV relative to ground level, input current will be dropped on ground through output 02 of the device. On the other hand, active limits of the above mentioned latch tie output 3 usually to 350 mV below ground level for negative input signals (see R1, R2, T2, T3 in fig.2). Thus, for transmitting input signal more 5
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.
6
IL1815
Mode 3, output 05 - grounded. With grounded output 05, input switching threshold is set from 0 V (typical rate) up to 25 mV (maximum). Positive wave (front) of input signal crossing zero equip the zero detector and the next coming negative wave (edge) - start the IC. This is the main IC application mode. Single-ended operation synchronization. Pulse synchronization is preset by resistor and capacitor connected to output 14. Preferred maximum resistor value - 150 kOhm. Capacitance may be changed if needed (according to application requirements), until capacitor variable is not showing any leakage which will result adversely in RC - constant variable. Width of input pulse is determined by formula: W = 0.673 x R x C (2) Since normally generated is a string of pulses of a determined width, preferred maximum input signal frequency is: FI (maximum) = 1 / (1.346 x R x C) (3) In an applied example shown in figure 1 (R=150 kOhm, C=0.001 mkF), preferred maximum input frequency will usually be 5 kHz. Under influence of input frequency higher than preferred FI (maximum) value, operation of electrical circuit may be unreliable. For the applications which do not require generation of pulses into electrical circuit (i.e. in static operation mode), output 14 may be directly connected to the ground. Logic inputs and outputs. In some systems it's necessary to generate pulses, for example, under conditions of engine shutdown (when motor car is stopped), when variable reactive sensor has no output signal. External input pulses from output 09 strobed (pulses controlled) from choice input (output 11), go to output 10 when there is a high level (H) on output 11. Output 12 - a direct output of data (generated pulses), is not subject to influence of logic on output 11. Input/output pins 09, 11, 10 and 12 are compatible with CMOS logic. Besides, pins 09, 11 and 12 are compatible with TTL logic. Output 10 is not meant for controlling TTL loading (see fig.3). Output 12 - an open collector of NPN-transistor. Pins 01, 04, 06 and 13 do not have internal connections and may be grounded.
7
IL1815
Diagram of IC output.
Vp R1 40Ohm T1 T4 Output 10 T3 T2 R2 2,7kOhm
8

▲Up To Search▲

Price & Availability of IL1815N

	To Download IL1815N Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .