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CM2500-05 Datasheet(PDF) 4 Page - California Micro Devices Corp

Part # CM2500-05
Description  CMOS Multiplexer for Keypad Switches
Download  5 Pages
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Manufacturer  CALMIRCO [California Micro Devices Corp]
Direct Link  http://www.calmicro.com
Logo CALMIRCO - California Micro Devices Corp

CM2500-05 Datasheet(HTML) 4 Page - California Micro Devices Corp

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© 2004 California Micro Devices Corp. All rights reserved.
4
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
Tel: 408.263.3214
Fax: 408.263.7846
www.calmicro.com
09/21/04
CM2500-05
Applications Information
Figure 1. Typical Application for Extended 4X4 Keyboard
The CM2500-05 can be used with just about any key-
pad configuration. The diagram below gives an exam-
ple of an interface for a 4 column x 4 row
implementation. The outputs of the CM2500-05 have
been designed to interface with nearly any type of key-
board setup provided the same methodology is used.
Basically if any one of the switches 17 to 21 are closed,
it will pull down 2 row lines rather than 1. All outputs on
the CM2500-05 are open drain.
It follows in the above implementation that:
• If SW17 is closed, row 1 and 2 are pulled low.
• If SW18 is closed, row 1 and 3 are pulled low.
• If SW19 is closed, row 1 and 4 are pulled low.
• If SW20 is closed, row 2 and 3 are pulled low.
• If SW21 is closed, row 2 and 4 are pulled low.
• If SW17-SW21 are not closed, the standard scan
routine is in effect (i.e., one row is pulled low)
In larger keypad implementations, multiple CM2500-05
can be used to yield more switches.
OUTA
SW1
SW3
SW4
SW5
SW6
SW7
SW8
SW9
SW10
SW11
SW12
SW13
SW14
SW15
SW16
Row1
Row2
Row3
Row4
Col1
Col2
Col3
Col4
OUT1
OUT2
OUT3
OUT5
OUT4
OUTB
IN1
IN2
IN3
IN5
IN4
GND
CM2500-05
VCC
SW2
SW17
SW18
SW19
SW20
SW21
VCC


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