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Intersil Electronic Components Datasheet



ICM7249

Micro-Power Event/Hour Meter



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ICM7249 pdf
ICM7249
August 1997
51/2 Digit LCD,
Micro-Power Event/Hour Meter
Features
Description
• Hour Meter Requires Only 4 Parts Total
• Micropower Operation: < 1µA at 2.8V (Typ)
• 10 Year Operation On One Lithium Cell. 21/2 Year
Battery Life with Display Connected
• Directly Drives 51/2 Digit LCD
• 14 Programmable Modes of Operation
• Times Hrs., 0.1 Hrs., 0.01 Hrs., 0.1 Mins.
• Counts 1’s, 10’s, 100’s, 1000’s
• Dual Function Input Circuit
- Selectable Debounce for Counter
- High-Pass Filter for Timer
• Direct AC Line Triggering with Input Resistor
• Winking “Timer Active” Display Output
• Display Test Feature
Applications
• AC or DC Hour Meters
• AC or DC Totalizers
• Portable Battery Powered Equipment
• Long Range Service Meters
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
ICM7249IPM
-20 to 85 48 Ld PDIP
PKG.
NO.
E48.6
The ICM7249 Timer/Counter is intended for long-term
battery-supported industrial applications. The ICM7249
typically draws 1µA during active timing or counting, due to
Intersil’ special low-power design techniques. This allows
more than 10 years of continuous operation without battery
replacement. The chip offers four timing modes, eight
counting modes and four test modes.
The ICM7249 is a 48 lead device, powered by a single DC
voltage source and controlled by a 32.768kHz quartz crystal.
No other external components are required. Inputs to the
chip are TTL-compatible and outputs drive standard direct
drive LCD segments.
Pinout
b6/c6 1
f5 2
g5 3
e5 4
d5 5
c5 6
b5 7
a5 8
f4 9
g4 10
e4 11
d4 12
c4 13
b4 14
a4 15
f3 16
g3 17
e3 18
d3 19
c3 20
b3 21
a3 22
f2 23
g2 24
ICM7249
(PDIP)
TOP VIEW
48 DT
47 S/S
46 C3
45 C2
44 C1
43 C0
42 GND
41 OSC OUTPUT
40 OSC INPUT
39 VDD
38 BP
37 W
36 a1
35 b1
34 c1
33 d1
32 e1
31 g1
30 f1
29 a2
28 b2
27 c2
26 d2
25 e2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
9-23
File Number 3170.1



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ICM7249 pdf
ICM7249
Functional Block Diagram
OSC
IN
OSC
OUT
S/S
V+
OSC
VOLTAGE
REGLATOR
215 DIVIDER
SWITCH
DEBOUNCE
1Hz 6 SEC
÷6 ÷6
32Hz
C0
C1
C2
C3
16
V-
÷2
1 SEG
DEC
÷10
4
7 SEG
DEC
÷10
7 SEG
DEC
÷10
7 SEG
DEC
÷10
7 SEG
DEC
÷10
4
7 SEG
DEC
÷10 ÷10 ÷10
WINK
SEG
1Hz DISPLAY
TEST
32Hz
B6 F5 G5
A1 W
BP DT
9-24



Part Number ICM7249
Description Micro-Power Event/Hour Meter
Maker Intersil Corporation - Intersil Corporation
Total Page 9 Pages
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