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參數(shù)資料
| 型號： | ICM7216DIPI |
| 廠商： | INTERSIL CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | 8-Digit, Multi-Function, Frequency Counters/Timers |
| 中文描述： | LED DISPLAY DRIVER, PDIP28 |
| 封裝： | PLASTIC, MS-011AB, DIP-28 |
| 文件頁數(shù)： | 8/18頁 |
| 文件大?。?/td> | 642K |
| 代理商： | ICM7216DIPI |
8
9.
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
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 8. 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 8 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
t
r
= t
f
= 10ns
COUNTED
TRANSITIONS
50ns MIN
FIGURE 6. WAVEFORM FOR GUARANTEED MINIMUM
f
A
(MAX) FUNCTION = FREQUENCY,
FREQUENCY RATIO, UNIT COUNTER
INPUT A OR
INPUT B
4.5V
0.5V
MEASURED
INTERVAL
250ns
MIN
t
r
= t
f
= 10s
250ns
MIN
FIGURE 7. WAVEFORM FOR GUARANTEED MINIMUM
f
B
(MAX) AND f
A
(MAX) FOR FUNCTION = PERIOD
AND TIME INTERVAL
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 8. SIMPLIFIED BLOCK DIAGRAM OF FUNCTIONS IMPLEMENTATION
TABLE 2. 7216B INPUT ROUTING
FUNCTION
MAIN
COUNTER
REFERENCE COUNTER
Frequency (f
A
)
Input A
100Hz (Oscillator
∏
÷
10
5
or
10
4
)
Period (t
A
)
Ratio (f
A
/f
B
)
Oscillator
Input A
Input A
Input B
Time Interval
(A
→
B)
Oscillator
Input A
Input B
Unit Counter
(Count A)
Input A
Not Applicable
Osc. Freq.
(f
OSC
)
Oscillator
100Hz (Oscillator
∏
÷
10
5
or
10
4
)
TABLE 2. 7216B INPUT ROUTING
FUNCTION
MAIN
COUNTER
REFERENCE COUNTER
ICM7216B
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