CALMIRCO CM2500-05QE

CM2500-05
CMOS Multiplexer for Keypad Switches
Features
Product Description
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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.
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
Applications
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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
GND
IN1
IN2
IN3
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.
Simplified Module Schematic
(One channel pair only)
IN4
IN5
VCC
A
R
R
IN
B
R
R
IN
A
B
R
R
IN
A
B
R
R
IN
A
B
R
IN
IN
A
B
R
B
A
N1
R
R
N2
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
7 IN4
8 IN5
11 OUTB
14
13
12 OUT5
OUT4
1
OUT3
2
NC
10 GND
15
OUTA
9 NC
QFN16
3X3
16
3
OUT2
4
OUT1
IN1
VCC
6 IN3
5 IN2
Bottom View
16-Lead QFN Package
Note: This drawing is not to scale.
PIN DESCRIPTIONS
PINS
NAME
DESCRIPTION
1
NC
2
OUTA
No internal connection.
3
VCC
Positive supply voltage.
4
IN1
Input 1 from switch to be multiplexed.
5
IN2
Input 2 from switch to be multiplexed.
6
IN3
Input 3 from switch to be multiplexed.
7
IN4
Input 4 from switch to be multiplexed.
8
IN5
Input 5 from switch to be multiplexed.
No internal connection.
Combined "Functional OR" output of IN1, IN2 and IN3.
9
NC
10
GND
Negative supply voltage.
11
OUTB
Combined "Functional OR" output of IN4 and IN5.
12
OUT5
Output 5 to keypad interface lines.
13
OUT4
Output 4 to keypad interface lines.
14
OUT3
Output 3 to keypad interface lines.
15
OUT2
Output 2 to keypad interface lines.
16
OUT1
Output 1 to keypad interface lines.
Ordering Information
PART NUMBERING INFORMATION
Standard Finish
Lead-free Finish
Pads
Package
Ordering Part
Number1
Part Marking
Ordering Part
Number1
Part Marking
16
QFN-16
CM2500-05QF
CM250005QF
CM2500-05QE
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
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.calmicro.com
09/21/04
CM2500-05
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
RATING
UNITS
+2000
V
[GND - 0.5] to +6.0
V
[GND - 0.5] to [VCC + 0.5]
V
ESD Protection (HBM, All Pins, See Note 1)
VCC
VI (Inputs and Outputs)
Storage Temperature Range
-65 to +150
°C
Operating Temperature Range - Junction
-40 to +150
°C
0.5
W
DC Package Power rating
Note 1: Equivalent to discharging a 100pF capacitor via a 1.5kΩ resistor (Human body model).
STANDARD (RECOMMENDED) OPERATING CONDITIONS
SYMBOL
PARAMETER
MIN
VCC
Supply Voltage
1.5
VI
TAMB
DC Input Voltage
Ambient Operating Temperature Range
TYP
MAX
UNITS
5.5
V
0
-
VCC
V
-40
-
85
°C
ELECTRICAL OPERATING CHARACTERISTICS (NOTE 1)
Supply Pins (VBUS = 4.1V to 5.5V; VCC = 1.65V to 3.6V)
SYMBOL
PARAMETER
CONDITIONS
ICC
Supply quiescent current
All inputs/outputs floating
ROUT
OUTx Pull-up Resistance
RIN2.7
INx Pull-up Resistance
RIN1.8
MIN
TYP
MAX
UNITS
0.1
10.0
µA
50
100
150
kΩ
VCC=2.7V, PIN at GND
50
100
150
kΩ
INx Pull-up Resistance
VCC=1.8V, PIN at GND
100
240
500
kΩ
VD
Voltage Drop (OUTx to GND)
VCC=2.7V, INx = GND
10
100
mV
VIL
Maximum Low-level Input Voltage
VCC x 0.3
V
VIH
Minimum High-level Input Voltage
VCC x 0.7
V
IL
OUTx Leakage Current
INx floating
1.0
µA
CP
OUTx / INx Pin Capacitance
At 2.5 Volt bias, 1 MHz
15
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
GPIO Interface Lines
Col2
Col3
Col4
SW4
SW3
SW2
SW1
SW8
SW7
SW6
SW5
CM2500-05
Row1
OUTA
VCC
OUT1
IN1
OUT2
IN2
OUT3
IN3
OUT4
IN4
OUT5
IN5
OUTB
GND
Row2
SW12
SW11
SW10
SW9
SW16
SW15
SW14
SW13
Row3
Row4
SW17
SW18
SW19
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.
© 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
Mechanical Package Diagrams
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.
D
PACKAGE DIMENSIONS
QFN
Leads
Dim.
E
Package
16
Millimeters
Pin 1 Marking
Inches
Min
Nom
Max
Min
Nom
Max
A
0.70
0.75
0.80
.028
.030
.031
0.15 C
A1
0.00
0.02
0.05
0.00
.001
.002
0.15 C
A3
0.20 REF
.008
b
0.20
0.25
0.30
.008
.010
.012
D
2.9
3.0
3.1
.114
.118
.122
D1
1.50 REF
0.10 C
.059 REF
D2
1.00
1.10
1.20
.039
.043
.047
E
2.9
3.0
3.1
.114
.118
.122
E1
1.50 REF
E2
1.00
e
1.10
0.30
# per
tape and
reel
0.40
0.08 C
.059 REF
1.20
.039
0.50 TYP.
L
TOP VIEW
.043
A3 A1
SIDE VIEW
.047
A
.020 TYP.
0.50
.012
.016
D1
.020
2500 pieces*
D2
* This is an approximate number which may vary.
E2
E1
Controlling dimension: millimeters
L
DAP SIZE
1.8 X 1.8
b
e
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