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CM2500-05 Datasheet(PDF) 4 Page - California Micro Devices Corp |
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CM2500-05 Datasheet(HTML) 4 Page - California Micro Devices Corp |
4 / 5 page © 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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