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參數(shù)資料
| 型號： | ICM7216A |
| 廠商： | Intersil Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | 8-Digit, Multi-Function, Frequency Counters/Timers |
| 中文描述： | 8位數(shù)字，多功能，頻率計數(shù)器/定時器 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 141K |
| 代理商： | ICM7216A |
9-19
input at V
DD
. While in Display Off mode, the segments and
digit drivers are all off, leaving the display lines floating, so the
display can be shared with other devices. In this mode, the
oscillator continues to run with a typical supply current of
1.5mA with a 10MHz crystal, but no measurements are made
and multiplexed inputs are inactive. A new measurement
cycle will be initiated when the HOLD input is switched to
V
SS
.
Display Test
- Display will turn on with all the digits showing
8s and all decimal points on. The display will be blanked if
Display Off is selected at the same time.
1MHz Select
- The 1MHz select mode allows use of a 1MHz
crystal with the same digit multiplex rate and time between
measurement as with a 10MHz crystal. This is done by
dividing the oscillator frequency by 10
4
rather than 10
5
. The
decimal point is also shifted one digit to the right in period
and time interval, since the least significant digit will be in
μ
s
increment rather than 0.1
μ
s increment.
External Oscillator Enable
- In this mode, the signal at EXT
OSC INPUT is used as a timebase instead of the on-board
crystal oscillator (built around the OSC INPUT, OSC OUT-
PUT inputs). This input can be used for an external stable
temperature compensated crystal oscillator or for special
measurements with any external source. The on-board crys-
tal oscillator continues to work when the external oscillator is
selected. This is necessary to avoid hang-up problems, and
has no effect on the chip's functional operation. If the on-
board oscillator frequency is less than 1MHz or only the
external oscillator is used, THE OSC INPUT MUST BE
CONNECTED TO THE EXT OSC INPUT providing the time-
base has enough voltage swing for OSC INPUT (See Electri-
cal Specifications). If the external timebase is TTL level a
pullup resistor must be used for OSC INPUT. The other way
is to put a 22M
resistor between OSC INPUT and OSC
OUTPUT and capacitively couple the EXT OSC INPUT to
OSC INPUT. This will bias the OSC INPUT at its threshold
and the drive voltage will need to be only 2V
P-P
. The exter-
nal timebase frequency must be greater than 100kHz or the
chip will reset itself to enable the on-board oscillator.
External Decimal Point Enable
- In this mode, the EX DP
INPUT is enabled (lCM7216D only). A decimal point will be
displayed for the digit that its output line is connected to this
input (EX DP INPUT). Digit 8 should not be used since it will
override the overflow output. Leading zero blanking is effec-
tive for the digits to the left of selected decimal point.
Hold Input
Except in the
unit counter mode
, when the HOLD input is
at V
DD
, any measurement in progress (before STORE goes
low) is stopped, the main counter is reset and the chip is
held ready to initiate a new measurement as soon as HOLD
goes low. The latches which hold the main counter data are
not updated, so the last complete measurement is displayed.
In
unit counter
mode when HOLD input is at V
DD
, the
counter is not stopped or reset, but the display is frozen at
that instantaneous value. When HOLD goes low the count
continues from the new value in the new counter.
RESET Input
The RESET input resets the main counter, stops any
measurement in progress, and enables the main counter
latches, resulting in an all zero output. A capacitor to ground
will prevent any hang-ups on power-up.
MEASUREMENT IN PROGRESS
This output is provided in lCM7216D. It stays low during
measurements and goes high for intervals between mea-
surements. It is provided for system interfacing and can drive
a low power Schottky TTL or one ECL load if the ECL device
is powered from the same supply as lCM7216D.
Decimal Point Position
Table 3 shows the decimal point position for different modes
of lCM7216 operation. Note that the digit 1 is the least signif-
icant digit. Table 3 is for 10MHz timebase frequency.
Overflow Indication
When overflow happens in any measurement it will be indicated
on the decimal point of the digit 8. A separate LED indicator can
be used. Figure 12 shows how to connect this indicator.
Overflow will be indicated on the decimal point output of
digit 8. A separate LED overflow indicator can be connected
as follows:
DEVICE
CATHODE
ANODE
ICM7216A
Decimal Point
D8
ICM7216B/D
D8
Decimal Point
a
b
c
d
f
g
e
DP
FIGURE 12. SEGMENT IDENTIFICATION AND DISPLAY FONT
TABLE 3. DECIMAL POINT POSITIONS
RANGE
FREQUENCY
PERIOD
FREQUENCY
RATIO
TIME
INTERVAL
UNIT
COUNTER
OSCILLATOR
FREQUENCY
0.01s/1 Cycle
D2
D2
D1
D2
D1
D2
0.1s/10 Cycle
D3
D3
D2
D3
D1
D3
1s/100 Cycle
D4
D4
D3
D4
D1
D4
10s/1K Cycle
D5
D5
D4
D5
D1
D5
ICM7216A, ICM7216B, ICM7216D
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| ICM7216BlPl | 8-Digit, Multi-Function, Frequency Counters/Timers |
| ICM7216D | 8-Digit, Multi-Function, Frequency Counters/Timers |
| ICM7216DlPl | 8-Digit, Multi-Function, Frequency Counters/Timers |
| ICM7216AlJl | Circular Connector; No. of Contacts:79; Series:MS27496; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:21; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:21-35 RoHS Compliant: No |
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相關(guān)代理商/技術(shù)參數(shù) |
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| ICM7216AIJI | 制造商:Intersil Corporation 功能描述:IC UNIVERSAL COUNTER 7216 DIP28 |
| ICM7216AIJI WAF | 制造商:Intersil Corporation 功能描述: |
| ICM7216ALJL | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:8-Digit, Multi-Function, Frequency Counters/Timers |
| ICM7216B | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:8-Digit, Multi-Function, Frequency Counters/Timers |
| ICM7216B_04 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:8-Digit, Multi-Function, Frequency Counters/Timers |
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