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參數(shù)資料
| 型號： | ICM7249 |
| 廠商： | Intersil Corporation |
| 英文描述： | 51/2 Digit LCD, Micro-Power Event/Hour Meter |
| 中文描述： | 51 / 2數(shù)字液晶顯示，微功率事件/小時計 |
| 文件頁數(shù)： | 8/9頁 |
| 文件大?。?/td> | 49K |
| 代理商： | ICM7249 |
9-30
turns off at the end of the 16th BP cycle and turns back on at
the end of the 32nd BP cycle, giving a half-second wink. If
the counting occurs more frequently than once a second, the
wink output will continue to flash at the constant rate of 1Hz.
Display Test and Reset
The display may be tested at any time without disturbing
operation by pulsing DT high, as seen in Figure 6. On the
next positive transition of BP, all the segments turn on and
remain on until the end of the 16th BP cycle. This takes a
half-second or less. All the segments then turn off for an
additional 48 BP cycles (the end of the 64th cycle), after
which valid data returns to the display. As long as DT is held
high, the segments will remain on.
Additional display testing is provided by using mode 12. In this
mode each displayed decade is incremented on each positive
transition of S/S. Modes 13 and 14 are manufacturer testing only.
Mode 15 resets all the decades and internal counters to zero,
essentially bringing everything back to power-up status.
Applications
A typical use of the ICM7249 is seen in Figure 8, the Motor
Hour Meter. In this application the ICM7249 is configured as
an hours-in-use meter and shows how many whole hours of
line voltage have been applied. The resistor network and
high-pass filtering allow AC line activation of the S/S input.
This configuration, which is powered by a 3V lithium cell, will
operate continuously for 2
1
/
2
years. Without the display,
which only needs to be connected when a reading is
required, the span of operation is extended to 10 years.
When the ICM7249 is configured as an attendance counter,
as shown in Figure 9, the display shows each increment. By
using mode 2, external debouncing of the gate switch is
unnecessary, provided the switch bounce is less than 10ms.
The 3V lithium battery can be replaced without disturbing
operation if a suitable capacitor is connected in parallel with
it. The display should be disconnected, if possible, during the
procedure to minimize current drain. The capacitor should
be large enough to store charge for the amount of time
needed to physically replace the battery (
t =
VC/I). A
100
μ
F capacitor initially charged to 3V will supply a current
of 1.0
μ
A for 50 seconds before its voltage drops to 2.5V,
which is the minimum operating voltage for the ICM7249.
Before the battery is removed, the capacitor should be
placed in parallel, across the V
DD
and GND terminals. After
the battery is replaced, the capacitor can be removed and
the display reconnected.
FIGURE 7. DIGITS SEGMENT ASSIGNMENT
a
b
c
d
f
g
e
FIGURE 8. MOTOR HOUR METER
120VAC
60Hz
36
W
BP
A1
B6/C6
OSC
1
OSC
0
DT
C3
C2
C1
C0
V
SS
V
DD
S/S
+3V L
i
AC MOTOR
10M
100K
10M
DISPLAY
TEST
32.768kHz
CRYSTAL
M
LCD
ICM7249
+
ICM7249
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICM7249_01 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:5 1/2 Digit LCD, Micro-Power Event/Hour Meter |
| ICM7249D WAF | 制造商:Harris Corporation 功能描述: |
| ICM7249IPM | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:51/2 Digit LCD, Micro-Power Event/Hour Meter |
| ICM724CBA | 制造商:Harris Corporation 功能描述: |
| ICM7250 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:TIMERS COUNTERS AND DISPLAY DRIVERS |
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