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ICM7216DLPL Datasheet(PDF) 8 Page - Harris Corporation |
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ICM7216DLPL Datasheet(HTML) 8 Page - Harris Corporation |
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8 / 17 page  13-29 ICM7216A, ICM7216B, ICM7216D Description INPUTS A and B INPUTS A and B are digital inputs with a typical switching threshold of 2.0V at VDD = 5.0V. For optimum performance the peak-to-peak input signal should be at least 50% of the supply voltage and centered about the switching voltage. When these inputs are being driven from TTL logic, it is desirable to use a pullup resistor. The circuit counts high to low transitions at both inputs. (INPUT B is available only on lCM7216A and lCM7216B). Note that the amplitude of the input should not exceed the device supply (above the VDD and below the VSS) by more than 0.3V, otherwise the device may be damaged. Multiplexed Inputs The FUNCTION, RANGE, CONTROL and EXTERNAL DECIMAL POINT inputs are time multiplexed to select the function desired. This is achieved by connecting the appro- priate Digit driver output to the inputs. The function, range and control inputs must be stable during the last half of each digit output, (typically 125 µs). The multiplexed inputs are active high for the common anode lCM7216A and active low for the common cathode lCM7216B and lCM7216D. Noise on the multiplex inputs can cause improper operation. This is particularly true when the unit counter mode of operation is selected, since changes in voltage on the digit drivers can be capacitively coupled through the LED diodes to the multiplex inputs. For maximum noise immunity, a 10k Ω resistor should be placed in series with the multiplexed inputs as shown in the application circuits. Table 1 shows the functions selected by each digit for these inputs. TABLE 1. MULTIPLEXED INPUT FUNCTIONS FUNCTION DIGIT FUNCTION INPUT (Pin 3, lCM7216A and B Only) Frequency D1 Period D8 Frequency Ratio D2 Time Interval D5 Unit Counter D4 Oscillator Frequency D3 RANGE INPUT, Pin 14 0.01s/1 Cycle D1 0.1s/10 Cycles D2 1s/100 Cycles D3 10s/1K Cycles D4 CONTROL INPUT, Pin 1 Display Off D4 and Hold Display Test D8 1MHz Select D2 External Oscillator Enable D1 External Decimal Point Enable D3 External DP INPUT (Pin 13, ICM7216D Only) Decimal point is output for same digit that is connected to this input. FIGURE 9. WAVEFORM FOR GUARANTEED MINIMUM fA(MAX) FUNCTION = FREQUENCY, FREQUENCY RATIO, UNIT COUNTER FIGURE 10. WAVEFORM FOR GUARANTEED MINIMUM fB(MAX) AND fA(MAX) FOR FUNCTION = PERIOD AND TIME INTERVAL Function Input The six functions that can be selected are: Frequency, Period, Time Interval, Unit Counter, Frequency Ratio and Oscillator Frequency. This input is available on the lCM7216A and lCM7216B only. The implementation of different functions is done by routing the different signals to two counters, called “Main Counter” and “Reference Counter”. A simplified block diagram of the device for functions realization is shown in Figure 11. Table 2 shows which signals will be routed to each counter in different cases. The output of the Main Counter is the information which goes to the display. The Reference Counter divides its input by 1, 10, 100 and 1000. One of these outputs will be selected through the range selector and drive the enable input of the Main Counter. This means that the Reference Counter, along with its' associated blocks, directs the Main Counter to begin counting and determines the length of the counting period. Note that Figure 11 does not show the complete functional diagram (See the Functional Block Diagram). After the end of each counting period, the output of the Main Counter will be latched and displayed, then the counter will be reset and a new measurement cycle will begin. Any change in the FUNCTION INPUT will stop the present measurement without updating the display and then initiate a new measurement. This prevents an erroneous first reading after the FUNCTION INPUT is changed. In all cases, the 1-0 transitions are counted or timed. INPUT A 4.5V 0.5V 50ns MIN tR = tF = 10ns COUNTED TRANSITIONS 50ns MIN INPUT A OR INPUT B 4.5V 0.5V MEASURED INTERVAL 250ns MIN tR = tF = 10s 250ns MIN |
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