Application of the KR512PS10 chip. Encyclopedia of radio electronics and electrical engineering

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Experiments with KR512PS10 microcircuits showed that the real characteristics of these devices are much better than the passport ones. First, the maximum clock frequency of the RC oscillator assembled according to the circuit in fig. 1, and counters exceeded 1 MHz (ratings are for a frequency of 1 MHz). Second, the open-drain output is also well above the guaranteed 5,2mA.

On fig. Figure 2 shows an empirically plotted low-level open-drain output voltage vs. load current. In the initial section, it is consistent with that shown in Fig. 8 in the article"Generator - frequency divider KR512PS10"in "Radio", 2000, No. 7). It can be seen that a load that consumes 20 ... 30 mA, for example, an electromagnetic relay, can be connected to this output.

It has also been established that an open-drain output allows a high-level voltage of up to 20 V to be applied to it without failure of the microcircuit, while the output leakage current will not exceed 2 μA. In other words, the microcircuit allows switching loads up to 600 mW.

The ability to control the phase of the signal at the output with a common drain provides the flexibility of the microcircuit in various devices. If a relay is connected to this output, at a high level at the IN input, after resetting and starting the counters, the relay will turn on and off after a time corresponding to half the period of the output frequency. If a low level is applied to the IN input, the relay will be turned off after start-up and will operate at the end of the specified time interval.

The clock frequency of the RC generator, in the case when it is significantly lower than the limit, can be calculated using the approximate formula f=1/1,8R·C. The fact that the coefficient in the denominator differs from the standard value of 1,4 for such generators is explained by the presence of electrical hysteresis at the RC input with a loop width of about 0,5 V.

To build a single vibrator on the KR512PS10 chip, it is enough to connect its output (pin 10) to the ST input. The single vibrator starts when a short high-level pulse is applied to the input R0. A low level appears at the output, the counters start working. After a time equal to half the period of the output frequency, the output will go high, the counters will stop. The disadvantage of this single vibrator, as well as many others, is that at the time of power-up, it starts up once in the absence of a control signal.

With a master oscillator frequency of 1 Hz and a maximum frequency division ratio, the period of output oscillations exceeds nine months. In practice, this means that the micro-circuit ensures the construction of a timer for any reasonable time.

The generator can also work with a quartz resonator. On fig. 3a shows a diagram of the generator, the operation of which was tested with a resonator at a frequency of 32768 Hz, 100, 150 and 200 kHz, and in fig. 3b - 500 and 1024 kHz. However, if at a frequency of 500 kHz the generator worked in the entire allowable range of the supply voltage, then with a resonator at 1024 kHz - only at a voltage of more than 5 V.

It is interesting to note that by connecting the output (pin 10) of the microcircuit with the inputs for setting the division factor, you can get values ​​​​of this factor that are different from those indicated in the table, but the duty cycle of the output pulses will not be equal to 2. The ratio of the pause between low-level pulses to their duration will be determined by the product of weight coefficients of inputs connected to the output. For example, if you connect inputs 60 and 3 to it, and leave the rest unconnected, then at a master oscillator frequency of 2048 Hz, the microcircuit will generate low-level pulses with a duration of 0.5 s and intervals between them of 90 s (period - 90,5 s, duty cycle - 181), and the overall division factor is 2048 90,5 = 185344.

However, the features of the operation of the counters at the moments of switching the division coefficients sometimes lead to an increase or decrease in the division coefficient by one. Therefore, to use a microcircuit with non-standard coefficients, you should first check its operation with this inclusion.

Author: S. Biryukov, Moscow

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