SU1335919A1 - Device for checking current consumed by cmos-integrated circuit - Google Patents

Abstract

The invention relates to the monitoring of electronic components of time devices, in particular, to devices for controlling the current consumption of CMOS chips, and can be used in the watch industry. The purpose of the invention — to increase the reliability of control of CMOS chips — is achieved by detecting a malfunction due to the presence of leakage current of one of the input inverter chips, not detected by other means of control. For this, two waiting multivibrators 15 and 16, the second element AND 17 and the control unit 6 are introduced into the device. In addition, the device contains a power source 1, a pulse generator 2, keys 3 and 4, a block 5 for connecting a controlled CMOS circuit, RS flip-flop 7, element 8, indicators 9 and 10, control termination signal bus 11, resistor 12, shaper 13 pulses and selector 14 pulses in duration. 6 Il. i (Л С 00 00 01 with and - with Rig.

Description

The invention relates to the control of electronic components of time devices, namely, devices for controlling the current consumption of CMOS chips, and can be used in the watch industry.

The goal of the invention is to reliably control CMOS chips. by detecting a malfunction due to the presence of a leakage current of one of the input inverters of the microcircuit not detected by other means of control.

i FIG. 1 is a block diagram of a device for monitoring the current consumption of CMOS chips; FIG. 2 - functional control unit circuit; in fig. 3 - and A are, respectively, functional diagrams of the pulse generator and the pulse selector by duration, in FIG. 5, timing diagrams explaining the operation of the control unit, in FIG. 6 - timing diagrams explaining the operation of the device as a whole.

The device for controlling the current consumption of a CMOS chip contains a power source 1, a generator owl, keys 3 and 4, a block 5 for connecting a controlled CMOS chip, a control block 6, an RS flip-flop 7, element 8 ,. indicators 9 and 10, control termination signal bus 11, resistor 12, driver of 13 pulses, pulse selector 14 in duration, waiting multivibrators 15 and 16, element 17.

The power source 1 and the generator 2 pulses through the keys 3 and 4 are connected to block 5 for connecting a controlled CMOS chip, two outputs of which are connected to the inputs of control unit 6, one output of which is connected to the R input of the trigger 7, the outputs of which are connected to indicators 9 and 10, direct - with indicator 9, and inverse - with indicator 10 through element 8 and 8, the second code of control bus 6 control unit 11 is connected to the second input of element 8 of cell 8. Block 5 is connected through a resistor 12 to a common bus and the input shaper 13 pulses .the output of which is connected to the input of the selector 14 pulses in duration, the code of which is connected to the series-connected waiting multivibrators 15 and 16 and the input of the element 17, the second input of which is connected to the output of the control unit 6, and

from the third input with the output of the multivibrator 16. The output of the element And 17 is connected to the S-input of the trigger 7.

The control unit 6 (FIG. 2) contains an input 18, the first element OR 19,

10 shaper 20 of the initial setup signal, the second element OR 21, the trigger 22, the first output 23 of the block, the second and third inputs 24 and 25, the matching amplifiers 26 and 27, the trigger 15 28 and 29, the I-SHSh 30 element, the triggers 31 and 32 the second, third, and fourth exits are 33, 34, and 35, respectively.

Shaper 13 pulses (fig.Z)

20. contains input 36, amplifier 37, capacitor 38, resistor 39, comparator 40, output 41 ..

The selector 14 pulses in duration contains an input 42, a diode 43, resistors 44 and 45, a trimming resistor 46, a capacitor 47, a comparator 48, an output 49,

The device for controlling the current consumption of a CMOS chip operates as follows in a pulse-2-30 manner.

The control of the object begins on the Start signal (Fig. 5, I), setting the trigger 22 in a single state, Fig. 5, SO,

35 The current consumption pulses are extracted at resistor 12 and fed to the inputs 36 of the driver 13, and therefore to the input of the amplifier 37 k to the comparator 40, which forms square pulse from the current consumption pulse 40. The output signal of the comparator 40 is fed to the output 41 of the driver 13 pulses and then to the input 42 of the selector 14 pulses. At last

45 is constant for the charging time of the capacitor 47 by means of the trimming resistor 46 is set so that the comparator 48 is triggered if the pulse duration,

50 coming from the shaper

13 pulses, more than 10 μs. If: there is no leakage current in a controlled chip, then voltage is generated on resistor 12,

55 form which corresponds to the form of the current flowing at the moments of switching the chip elements of the input inverters, triggers, elements ORI, output inverters. These impulses

ten

15

25

31335919

13 pulses are input to the imaging unit, where they are amplified by the amplifier 37, after which the comparator 40 converts the pulse shape to rectangular.

The output signal of the driver 13 at the time of formation of the pulse is shown in FIG. 6, a. The greatest duration and amplitude of the pulse is the through current of the output inverter at the time of forming the leading edge of the output pulse. Therefore, the signal at the output of the selector 14 is only at the moment of the formation of the leading edge of the output pulse (Fig. 6, D) with the delay of the leading edge of the signal relative to. the front of the output pulse of the former 13 pulses per 10

Ca coming from the output of the pulse selector 14, starts the standby multivibrator 15. In turn, on the falling edge of the output pulse of the standby multivibrator 15 (Fig. 6, c), the standby multivibrator 16 starts, the output of which (Fig. 6.3 ) opens the element And 17 at the second entrance. However, the element 17 is closed by the output signal of the pulse selector 14, since at this moment the duration of the pulses arriving at the input of the pulse selector 14 does not exceed its threshold, i.e. 10 ISS. The duration of the output pulse of the standby multivibrator 15 is chosen slightly longer than the maximum permissible duration of the through current of the output inverters of the chip. The pulse duration of the standby multivibrator 16 can reach several microseconds. (In Fig. 6.1, the duration of the output pulse of the standby multivibrator 16 is approximately 31 TC at a frequency of 2 pulses of generator equal to 32768 Hz).

Thus, in the absence of leakage currents at the output of the element And 17 in the controlled object, the output pulse is not generated, since there is no output signal at the output of the pulse selector 14 in the presence of an enabling pulse from the output of the waiting i multivibrator 16 and, vice versa, at the output of the selector 14 pulses a pulse is generated due to the inverter through-current when forming at one of the outputs-micro30

the output pulse circuit, the element And 17 is closed by the output signal of the waiting multivibrator 16, since the duration of the output pulse of the waiting multivibrator is selected accordingly. In this case, the trigger 7 remains in the zero state (Fig. 6, a) until the end of the control, i.e. before the arrival of the second pulse from the output of the element AND-OR 30.

If there is leakage current in the controlled chip due to the input inverter, then the duration and period of the output pulses of the pulse former 13 will be determined by the parameters of the pulses generator 2 (Fig. 6, €). With a generator frequency of 2 32768 Hz and a duty cycle of the ISS. On the leading edge of a pulse of 20 pulses equal to 2, the duration

current pulses, leakage will be approximately 15 ISS.

Thus, at the output of the selector 14 there is a sequence of pulses with a period equal to the period of the generator 2, and with a duration determined by a constant charging time .: and the discharge of the capacitor 47 of the selector 14 of pulses (Fig. 6.0. On the leading edge of the output pulse of the pulse selector 14, a stand-by multivibrator 35 will start (Fig. 6). In turn, on the falling edge of the output pulse of the stand-by multivibrator 15, a multivibrator 16 is triggered (Fig. 6, d). potential la leads to the fact that the output element 17

40, a sequence of pulses is generated from the output of the pulse selector (Fig. 6, k), which leads to the triggering of the trigger 7 (Fig. 6,) and, as a result, to the triggering of the indicator 9, which can be used, for example, diode, which indicates the presence in the controlled object leakage currents.

50 If the duration and duration of the leakage current pulses are different from the considered case and have a large value, then the device operates as in the case considered,.

The control of the object ends after the arrival of the second pulse from the output of the object at the input of the matching amplifier 27, the output signal of 35

ten

15

20

25

thirty

35

Secondly (fig., 5), the passage through the ele-AND-or 30, records the unit in the trigger 32. In this case, the high potential from the unit output p. the trigger 32 is supplied through the OR element 21 to the R input of the Trigger 22 and to the third output 33 of the control unit 6, having returned to the initial state of the trigger 22. High potential

From the inverse output of the flip-flop 22, it arrives at the R-inputs of the flip-flops 28, -29 and 31, returning the trigger 28 (fig. 5j) and the flip-flop 31 (fig. 5, e) to the initial state. At the same time, the low 15 potential from the single output of the trigger 22 enters the fourth output 34 of the control unit 6 and, therefore, to the control inputs of the keys 3 and 4 and translates the latter into a non-conducting state, disconnecting the monitored object from the generator 2 and the source 1 At the same time, at the outputs of the matching amplifiers 26 and 27, the potentials of the low level 25 are set (figure 5, and, 2,). The presence at the output 33 of the block

6, the high potential control from the single output of the trigger 32 leads to the appearance of this signal on the bus 11 of the monitoring termination signal. 30, therefore, at the output of the element.

If no leakage currents are detected in the controlled object, i.e. if trigger 7 remains in the zero state, gg then a high potential arrives at the second input of the element And 8; The presence of a high potential on the bus 11 leads to the appearance of a signal at the output of the element 8 and, therefore, the indicator 10 triggers. Simultaneously with the appearance of a high potential on the bus 11 at the output 34 of the control unit 6, a low potential appears element And 17, thereby preventing 45 false triggering of the trigger 7 when turning off the power-controlled object. High potential on bus 11 is present either before the pulse arrives from the output of the driver 20 signal of the initial condition 19 b

or before the start signal arrives, upon receipt of which the device operation cycle is repeated.

Claims (1)

Invention Formula A device for controlling the current consumption of a CMOS chip, containing a generator connected to it via a switch for connecting a controlled CMOS chip pulse driver, which is connected to the input of a unit for connecting a controlled CMOS chip and through a resistor to a common bus and the output to a selector pulses of duration, RS-flip-flop, the outputs of which are connected one to the first indicator, and the second to the second indicator via an AND element, whose input is connected to the control termination signal bus, and a power source, through The second key is connected to the unit for connecting a controlled KMOP ICXI, characterized in that, in order to increase the reliability of control of CMOS chips by detecting a malfunction associated with the presence of a leakage current of one of the input inverters of the microcircuit, is not revealed by other by means of control, two waiting multivibrators are entered into it, the second element AND and the control unit, the first input of the second element AND is connected to the output of the pulse selector directly, the second input is sequentially connected The connected waiting multivibrators, and the third input - to the first input of the control unit, the output of the second element I - is connected to the S-input of the RS flip-flop, the R-input of which is connected to the second output of the control unit, the third output is connected to the control end bus, - the fourth output the latter is connected to the inputs of the keys, two inputs to the outputs of the unit for connecting a controlled CMOS chip, and the third input is the Start input of the device. FIG. g fig 3 FIG.