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
100kΩ 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 out-
put under light load. All inputs and outputs have an
internal pull up to V
CC
.
This device is particularly well suited for portable elec-
tronics (e.g. mobile handsets, PDAs, notebook com-
puters) 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, low-
profile 16-lead QFN package. This presents a 60%
saving in space when compared with a discrete imple-
mentation. The CM2500-05 is available with optional
lead-free finishing.
Applications
•
•
•
•
•
•
Enables more keys from current keyboard control-
ler 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
©
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
Number
1
CM2500-05QF
Part Marking
CM250005QF
Lead-free Finish
Ordering Part
Number
1
CM2500-05QE
Part Marking
CM250005QE
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
©
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)
V
CC
V
I
(Inputs and Outputs)
Storage Temperature Range
Operating Temperature Range - Junction
DC Package Power rating
Note 1: Equivalent to discharging a 100pF capacitor via a 1.5kΩ 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
V
CC
V
I
T
AMB
PARAMETER
Supply Voltage
DC Input Voltage
Ambient Operating Temperature Range
MIN
1.5
0
-40
-
-
TYP
MAX
5.5
V
CC
85
UNITS
V
V
°C
ELECTRICAL OPERATING CHARACTERISTICS
(NOTE 1)
Supply Pins (V
BUS
= 4.1V to 5.5V; V
CC
= 1.65V to 3.6V)
SYM-
BOL
I
CC
R
OUT
R
IN2.7
R
IN1.8
V
D
V
IL
V
IH
I
L
C
P
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
V
CC
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
V
CC
x 0.3
UNITS
µA
kΩ
kΩ
kΩ
mV
V
V
µA
pF
Note 1: Operating Characteristics are over Standard Operating Conditions unless otherwise specified.
©
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 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.
©
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 16-
lead 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
©
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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