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ICM7226ALJL Datasheet(PDF) 8 Page - Intersil Corporation |
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ICM7226ALJL Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 19 page 8 Table 1 shows the functions selected by each digit for these inputs. Function Input The six functions that can be selected are: Frequency, Period, Time Interval, Unit Counter, Frequency Ratio and Oscillator Frequency. 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 differ- ent cases. The output of the Main Counter is the information which goes to the display. The Reference Counter divides its input to 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 com- plete functional diagram (See the Functional Block Dia- gram). 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. TABLE 1. MULTIPLEXED INPUT FUNCTIONS INPUT FUNCTION DIGIT FUNCTION INPUT Pin 4 Frequency D1 Period D8 Frequency Ratio D2 Time Interval D5 Unit Counter D4 Oscillator Frequency D3 RANGE INPUT Pin 21 0.01s/1 Cycle D1 0.1s/10 Cycles D2 1s/100 Cycles D3 10s/1K Cycles D4 Enable External Range Input D5 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 20 Decimal point is output for same digit that is connected to this input. TABLE 2. INPUT ROUTING FUNCTION MAIN COUNTER COUNTER Frequency (fA) Input A 100Hz (Oscillator ³ ÷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) InputA NotApplicable Osc. Freq. (fOSC) Oscillator 100Hz (Oscillator ³ ÷105 or 104) 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 FIGURE 11. SIMPLIFIED BLOCK DIAGRAM OF FUNCTIONS IMPLEMENTATION ICM7226A, ICM7226B |
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