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| CM2500-05 CMOS Multiplexer for Keypad Switches Features * * * * * * * Functionally equivalent to a five-diode pair network Up to 60% space saving vs. discrete solution Flexibility in design with "separate" outputs 100k pull-up resistors on outputs Voltage drop of less than 10mV under light loads 16-lead QFN package - 3mm x 3mm, 0.5mm pitch Lead-free version available Product Description The CM2500-05 is a CMOS multiplexer for keypad switches. The device is functionally equivalent to a five-diode pair network. However, each channel in this network has virtually no voltage drop from input to output under light load. All inputs and outputs have an internal pull up to VCC. This device is particularly well suited for portable electronics (e.g. mobile handsets, PDAs, notebook computers) because of its small package format. This product is ideal for converting the logic of keypad switches where each switch pulls two sense lines low. The keypad multiplexer channels are set up in series on the keypad sense lines such that it will interface directly to the CPU chipset. The CM2500-05 is available in a space-saving, lowprofile 16-lead QFN package. This presents a 60% saving in space when compared with a discrete implementation. The CM2500-05 is available with optional lead-free finishing. Applications * * * * * * Enables more keys from current keyboard controller without extra I/O from chipset Keypad switches in mobile electronics Roller pad or joystick in mobile electronic products Wireless Handsets MP3 Players Digital Cameras Simplified Block Schematic (One channel pair only) Simplified Module Schematic GND IN1 IN2 IN3 IN4 IN5 VCC A R R R R R IN IN IN IN IN IN A B B A B A B A B A B N1 N2 R R R R R R R GND OUTA OUT1 OUT2 OUT3 OUT4 OUT5 OUTB (c) 2004 California Micro Devices Corp. All rights reserved. 09/21/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 Tel: 408.263.3214 Fax: 408.263.7846 www.calmicro.com 1 CM2500-05 PACKAGE / PINOUT DIAGRAM Bottom View 5 IN2 6 IN3 7 IN4 8 IN5 IN1 VCC OUTA NC 4 3 2 1 16 15 14 13 9 NC QFN16 3X3 10 GND 11 OUTB 12 OUT5 OUT2 OUT3 OUT1 Note: This drawing is not to scale. 16-Lead QFN Package PIN DESCRIPTIONS PINS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 NAME NC OUTA VCC IN1 IN2 IN3 IN4 IN5 NC GND OUTB OUT5 OUT4 OUT3 OUT2 OUT1 DESCRIPTION No internal connection. Combined "Functional OR" output of IN1, IN2 and IN3. Positive supply voltage. Input 1 from switch to be multiplexed. Input 2 from switch to be multiplexed. Input 3 from switch to be multiplexed. Input 4 from switch to be multiplexed. Input 5 from switch to be multiplexed. No internal connection. Negative supply voltage. Combined "Functional OR" output of IN4 and IN5. Output 5 to keypad interface lines. Output 4 to keypad interface lines. Output 3 to keypad interface lines. Output 2 to keypad interface lines. Output 1 to keypad interface lines. Ordering Information PART NUMBERING INFORMATION Standard Finish Pads 16 Package QFN-16 Ordering Part Number1 CM2500-05QF Part Marking CM250005QF Lead-free Finish Ordering Part Number1 CM2500-05QE Part Marking CM250005QE Note 1: Parts are shipped in Tape & Reel form unless otherwise specified. (c) 2004 California Micro Devices Corp. All rights reserved. 2 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 OUT4 Tel: 408.263.3214 Fax: 408.263.7846 www.calmicro.com 09/21/04 CM2500-05 Specifications ABSOLUTE MAXIMUM RATINGS PARAMETER ESD Protection (HBM, All Pins, See Note 1) VCC VI (Inputs and Outputs) Storage Temperature Range Operating Temperature Range - Junction DC Package Power rating Note 1: Equivalent to discharging a 100pF capacitor via a 1.5k resistor (Human body model). RATING +2000 [GND - 0.5] to +6.0 [GND - 0.5] to [VCC + 0.5] -65 to +150 -40 to +150 0.5 UNITS V V V C C W STANDARD (RECOMMENDED) OPERATING CONDITIONS SYMBOL VCC VI TAMB PARAMETER Supply Voltage DC Input Voltage Ambient Operating Temperature Range MIN 1.5 0 -40 TYP MAX 5.5 VCC 85 UNITS V V C ELECTRICAL OPERATING CHARACTERISTICS (NOTE 1) Supply Pins (VBUS = 4.1V to 5.5V; VCC = 1.65V to 3.6V) SYMBOL ICC ROUT RIN2.7 RIN1.8 VD VIL VIH IL CP PARAMETER Supply quiescent current OUTx Pull-up Resistance INx Pull-up Resistance INx Pull-up Resistance Voltage Drop (OUTx to GND) Maximum Low-level Input Voltage Minimum High-level Input Voltage OUTx Leakage Current OUTx / INx Pin Capacitance INx floating At 2.5 Volt bias, 1 MHz VCC x 0.7 1.0 15 VCC=2.7V, PIN at GND VCC=1.8V, PIN at GND VCC=2.7V, INx = GND CONDITIONS All inputs/outputs floating 50 50 100 MIN TYP 0.1 100 100 240 10 MAX 10.0 150 150 500 100 VCC x 0.3 UNITS A k k k mV V V A pF Note 1: Operating Characteristics are over Standard Operating Conditions unless otherwise specified. (c) 2004 California Micro Devices Corp. All rights reserved. 09/21/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 Tel: 408.263.3214 Fax: 408.263.7846 www.calmicro.com 3 CM2500-05 Applications Information VCC Col1 Col2 GPIO Interface Lines Col3 Col4 SW4 SW3 SW2 SW1 CM2500-05 OUTA VCC IN1 IN2 IN3 IN4 IN5 GND Row1 SW8 SW7 SW6 SW5 OUT1 Row2 SW12 SW11 SW10 SW9 SW17 OUT2 OUT3 SW18 SW19 Row3 SW16 SW15 SW14 SW13 OUT4 Row4 OUT5 OUTB SW20 SW21 Figure 1. Typical Application for Extended 4X4 Keyboard The CM2500-05 can be used with just about any keypad configuration. The diagram below gives an example 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 keyboard 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. (c) 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 Mechanical Details QFN-16 Mechanical Specifications Dimensions for CM2500-05 devices supplied in 16lead QFN packages are presented below. For complete information on the QFN-16 package, see the California Micro Devices QFN Package Information document. Mechanical Package Diagrams D PACKAGE DIMENSIONS Leads Dim. A A1 A3 b D D1 D2 E E1 E2 e L # per tape and reel 0.30 1.00 1.00 2.9 0.20 2.9 Millimeters Min 0.70 0.00 Nom 0.75 0.02 0.20 REF 0.25 3.0 1.50 REF 1.10 3.0 1.50 REF 1.10 0.50 TYP. 0.40 0.50 .012 2500 pieces* D2 16 Inches Max 0.80 0.05 0.30 3.1 1.20 3.1 1.20 Min .028 0.00 .008 .114 .039 .114 .039 Nom .030 .001 .008 .010 .118 .059 REF .043 .118 .059 REF .043 .020 TYP. .016 .020 D1 E Package QFN Pin 1 Marking Max .031 .002 .012 .122 0.10 C 0.15 C 0.15 C TOP VIEW .047 .122 .047 0.08 C SIDE VIEW A3 A1 A Controlling dimension: millimeters E1 * This is an approximate number which may vary. E2 L DAP SIZE 1.8 X 1.8 e b 16X 0.10 M CAB BOTTOM VIEW Package Dimensions for 16-Lead QFN (c) 2004 California Micro Devices Corp. All rights reserved. 09/21/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 Tel: 408.263.3214 Fax: 408.263.7846 www.calmicro.com 5 |
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