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ICM7216BLPL Datasheet(PDF) 9 Page - Harris Corporation |
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ICM7216BLPL Datasheet(HTML) 9 Page - Harris Corporation |
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9 / 17 page  13-30 ICM7216A, ICM7216B, ICM7216D Frequency - In this mode input A is counted by the Main Counter for a precise period of time. This time is determined by the time base oscillator and the selected range. For the 10MHz (or 1MHz) time base, the resolutions are 100Hz, 10Hz, 1Hz and 0.1Hz. The decimal point on the display is set for kHz reading. Period - In this mode, the timebase oscillator is counted by the Main Counter for the duration of 1,10,100 or 1000 (range selected) periods of the signal at input A. A 10MHz timebase gives resolutions of 0.1 µs to 0.0001µs for 1000 periods aver- aging. Note that the maximum input frequency for period measurement is 2.5MHz. Frequency Ratio - In this mode, the input A is counted by the Main Counter for the duration of 1,10,100 or 1000 (range selected) periods of the signal at input B. The frequency at input A should be higher than input B for meaningful result. The result in this case is unitless and its resolution can go up to 3 digits after decimal point. Time Interval - In this mode, the timebase oscillator is counted by the Main Counter for the duration of a 1-0 transi- tion of input A until a 1-0 transition of input B. This means input A starts the counting and input B stops it. If other ranges, except 0.01s/1 cycle are selected the sequence of input A and B transitions must happen 10,100 or 1000 times until the display becomes updated; note this when measur- TABLE 2. 7216A/B INPUT ROUTING FUNCTION MAIN COUNTER REFERENCE COUNTER Frequency (fA) Input A 100Hz (Oscillator ÷105 or 104) Period (tA) Oscillator Input A Ratio (fA/fB) Input A Input B Time Interval (A →B) Oscillator Input A Input B Unit Counter (Count A) Input A Not Applicable Osc. Freq. (fOSC) Oscillator 100Hz (Oscillator ÷105 or 104) ing long time intervals to give enough time for measurement completion. The resolution in this mode is the same as for period measurement. See the Time Interval Measurement section also. Unit Counter - In this mode, the Main Counter is always enabled. The input A is counted by the Main Counter and displayed continuously. Oscillator Frequency - In this mode, the device makes a frequency measurement on its timebase. This is a self test mode for device functionality check. For 10MHz timebase the display will show 10000.0, 10000.00, 10000.000 and Overflow in different ranges. Range Input The RANGE INPUT selects whether the measurement period is made for 1,10,100 or 1000 counts of the Reference Counter. As it is shown in Table 1, this gives different count- ing windows for frequency measurement and various cycles for other modes of measurement. In all functional modes except Unit Counter, any change in the RANGE INPUT will stop the present measurement with- out updating the display and then initiate a new measure- ment. This prevents an erroneous first reading after the RANGE INPUT is changed. Control Input Unlike the other multiplexed inputs, to which only one of the digit outputs can be connected at a time, this input can be tied to different digit lines to select combination of controls. In this case, isolation diodes must be used in digit lines to avoid crosstalk between them (see Figure 17). The direction of diodes depends on the device version, common anode or common cathode. For maximum noise immunity at this input, in addition to the 10K resistor which was mentioned before, a 39pF to 100pF capacitor should also be placed between this input and the VDD or VSS (See Figure 17). Display Off - To disable the display drivers, it is necessary to tie the D4 line to the CONTROL INPUT and have the HOLD input at VDD. While in Display Off mode, the segments and FIGURE 11. SIMPLIFIED BLOCK DIAGRAM OF FUNCTIONS IMPLEMENTATION INTERNAL CONTROL 100Hz INPUT A INPUT B INPUT SELECTOR INTERNAL OR EXTERNAL OSCILLATOR INPUT A ENABLE CLOCK MAIN COUNTER RANGE SELECTOR ÷1 ÷10 ÷100 ÷1000 INTERNAL CONTROL INTERNAL CONTROL CLOCK INTERNAL CONTROL INPUT SELECTOR REFERENCE COUNTER |
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