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FlexiCoderTM K25C81 Versatile PC/XC/AT/PS/2 Compatible Keyboard Encoder
HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODERTM FAMILY DESCRIPTION The FlexiCoder is a versatile, lowpower keyboard encoder. It offers two bi-directional channels for communicating with a PC/XT/AT/PS2 system, and/or any optional keyboard-compatible devices, such as an 83 or 101/102 standard desktop keyboard, OCR, barcode reader, etc. The K25C81 directly interfaces a PC keyboard port, making custom keyboard to system communications fully transparent.
TM
FEATURES * Directly interfaces a PC keyboard port * Encodes up to 144 custom keys on an 8 X 18 matrix * Buffers up to 122 keycodes * Interfaces to 83/101/102 standard keyboard or other 8042-compatible device APPLICATIONS * * * * * Custom keyboards/keypads Control panels Automatic teller machines Embedded control systems Public Information Kiosks * * * * * Instrumentation Test and Measurement equipment Point of Sales terminals Industrial Controllers Medical Instruments * Enables custom keypad scan codes to remain unaffected by the Shift States of an external keyboard * Includes jumper-selectable autorepeat for designated keys * Offers two-key inhibit scanning mode
On an 8 x 18 matrix, the FlexiCoderTM will scan, debounce and encode up to 144 keys. Scan codes corresponding to single keys of the IBM 101 keyboard, or a combination of these keys when depressed with Shift, Ctrl, and Alt keys, are generated with each key press. Custom keypad input is not effected by the Shift States of an external keyboard. Users can conveniently define key assignments on the matrix as single or repeating actions. All keys must be released between key strokes or scanning is suspended. The encoder can buffer up to 122 keycodes, and control inputs and outputs are provided for interfacing with contact keyboards. The FlexiCoder is ideal for use with either BIOS-compatible chip sets or single-board computers for PC systems requiring a custom keyboard / keypad as an alternate or additional input device. Boards and evaluation kits are immediately obtainable and ready to connect.
TM
PIN ASSIGNMENTS
_RESET _IRQ VX C17 R6 RP KD KC EKC EKD C16 C0 C1 C2 C3 C4 C5 C6 C7 Vss
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
40 Vcc 39 OSCI 38 OSCO
R6 C17 VX NC _IRQ _RESET VCC OSCI OSC0 EKC1 NC
36 R7 35 NC 34 R5 33 R4 32 R3
RP KD KC EKC EKD C16 C0 C1 C2 C3 C4 7
6 1
40 39
1
R7 NC R5 R4 R3 R2 R1 R0 C8 C9 C10
C17 VX _IRQ _RESET NC NC VCC OSCI OSCO EKC1 R7
37 EKC1
DIP
31 R2 30 R1 29 R0 28 C8 27 C9 26 C10 25 C11 24 C12 23 C13 22 C14 21 C15
12
PLCC
34
17 18
23
29 28
R6 RP KD KC EKC EKD C16 C0 C1 C2 C3
QFP
NC R5 R4 R3 R2 R1 R0 C8 C9 C10 C11
NC C5 C6 C7 VSS NC C15 C14 C13 C12 C11
FlexiCoderTM is a trademark of Semtech Corp. All other trademarks belong to their respective companies.
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C4 C5 C6 C7 NC VSS C15 C14 C13 C12 NC
ORDERING CODE
Package options 40-pin, Plastic DIP 44-pin, Plastic PLCC 44-pin, Plastic QFP Pitch In mm's 2.54 mm 1.27 mm 0.8 mm TA = -40C to +85C K25C81-XX-P K25C81-XX-FN K25C81-XX-FB
FUNCTIONAL DIAGRAM
Data Buffer
Keyboard Encoder
Row Data Inputs 8
R0-R7
EKC1
Interrupt Control
Column Select Ouputs 18
C0-C17
KC KD
PC Communication Channel Mode Control
RP
EKC EKD
8042 Emulation (Standard Keyboard) Communication Channel
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FUNCTIONAL DESCRIPTION The FlexiCoderTM consists of six major sections (see functional diagram, previous page). These are the Keyboard Encoder, the Mode Control Unit, the PC Communication Channel, the 8042 Emulation Channel, the Interrupt Control Unit and the Data Buffer. These sections communicate with each other and operate concurrently. The controller continuously scans a keyboard organized as an 8 row by 18 column matrix, for a maximum of 144 keys. Smaller-size keyboards can be connected provided that all unused row pins are connected to Vcc. The microcontroller selects one of the 18 column lines (C0-C17) every 512 S and then reads the row data lines (R0-R7). A key closure is detected as a zero in the corresponding position of the matrix. A complete scan cycle for the entire keyboard takes approximately 9.2 mS. Each key press is debounced for a period of 20 mS. Once the key is verified, the corresponding key code(s) are loaded into the transmit buffer of the PC Keyboard Communication Channel.
PIN DEFINITIONS
Mnemonic Vcc Vss OSCI OSCO _RESET _IRQ VX RP DIP 40 20 39 38 1 2 3 6 PLCC 44 22 43 42 1 2 4 7 QFP 38 17 37 36 41 42 43 2 TYPE I I I O I I I I Name and Function Power Supply: +5V Ground Oscilator Input Oscilator Output Reset: apply 0 V to provide orderly start-up. Must be tied to Vcc Tie to Vcc. Rollover Mode Selection: tie to Vcc to select N-Key Rollover. Tie to Ground to select Two-Key Inhibit Mode. Keyboard Clock: connects to PC's keyboard port Clock Line. Keyboard Data: connects to PC's keyboard port Data Line. External Keyboard Data: connects to external keyboard Data Line. External Keyboard Clock: connects to external keyboard Clock Line. External Keyboard Clock 2: connects to external keyboard Clock Line and is used to generate an interrupt for every Clock Line transition. This signal must be inverted for PC/XT keyboards. Column Select Outputs: select one of columns.
KC KD EKD
8 7 10
9 8 11
4 3 6
I/O I/O I/O
EKC
9
10
5
I/O
EKC1
37
41
35
I
C0-C7
12-19
C8-C15 C16 C17
28-21 11 4
3-17 18 19-21 31-24 12 5
8-15
O
26-18 7 44
O I/O
R0-R5 R6 R7 NC
29-34 5 36 35
32-37 6 39 38, 3 18, 23 40
27-32 1 34 16, 33 22, 39 40
I I I -
Keyboard type selection: this pin is used both as outputs for column select and as input for standard keyboard-type selection. Row data inputs
No Connects: these pins are unused.
Note: An underscore before a pin mnemonic denotes an active low signal.
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REPEAT KEYS In custom masks, each key can be defined individually to be either Typematic or Single-Touch Action. In the standard mask, all keys are defined to be Single-Touch Action, except the Arrow Keys. Pin RP controls the repeat action of keys that are defined to be Typematic.
Repeat Mode RP
FUNCTIONAL DESCRIPTION, (CON'T)
Switch Matrix Encoding
Each matrix location is programmed to represent either a single key or a combination of keys of the IBM-standard 101/102 keyboard.
Scan Code Table Sets
The FlexiCoderTM supports two scan code table sets. Scan Code Sets 1 and 2 are the default sets for PC/XT and AT/PS/2 systems respectively. For more information, refer to the IBM Technical Reference Manual. Custom scan code tables, including macros, are also available. Operating modes are defined by the logic level of the relevant mode pins in the Mode Control Unit. SPECIAL HANDLING, (CON'T)
No repeat action Repeat action
L H
Table 1: Typematic Action Control
The Typematic rate can be controlled by issuing the appropriate commands from the system. SPECIAL HANDLING
Scan Matrix Data Integrity
The FlexiCoderTM maintains the integrity of the codes corresponding to the scanned matrix locations, independently of the Shift Status of the external keyboard or the system. For example, if a key has been defined on the matrix to send code corresponding to lower case letter "a", it will still send the scan code for "a" even if the Shift Key has been pressed or the Caps Lock has been set by the external keyboard. This is accomplished by internally maintaining a set of flags to monitor the Shift Status of the external keyboard and the system. If, for instance, the lower case key "a" is found to be pressed and Caps Lock is set, the codes sent will be as follows: 1. Caps Lock Make Code 2. Caps Lock Break (this will reset the Caps Lock status of the system) 3. "a" Make Code 4. "a" Break Code 5. Lock Make Code 6. Caps Lock Break Code (this will restore the Caps Lock status of the system)
External Keyboard Connection
If an external keyboard was not connected during power-on and then connected at a later time, the controller will proceed with the normal reset routine in order to initialize the external keyboard properly. Thereafter, the FlexiCoderTM checks for the presence of an external keyboard every 2 seconds. After communication has been established, the controller continues checking for the external keyboard's presence. Should the external keyboard be removed at a later time, the K25C81 detects the disconnection and will reinitiate the reset sequence upon reconnection. This feature allows the user to connect and disconnect an external keyboard at any time without resetting the system.
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EXT. KBD COMMUNICATION The external keyboard communication port of the FlexiCoderTM fully emulates a standard 8042, available to an 83/101/102 external keyboard or other compatible device. Communication with an external keyboard is accomplished via EKC and EKD, Clock and Data lines respectively. A third pin, EKC1 which connects to the Clock Line, interrupts the controller whenever an external keyboard initiates a communication. When power is first applied, the controller proceeds with the standard reset sequence with the external keyboard. Data and commands coming from the external keyboard are buffered in the controller's FIFO, along with data from the scanned matrix, and then presented to the system as if originating from a single source. Commands and data from the system, after being acknowledged, are then transmitted to the external keyboard.
MODE CONTROL The FlexiCoderTM implements all the standard functions of communication with a BIOScompatible PC/XT or AT/PS/2 host system. Two lines, KC and KD, provide bi-directional clock and data signals according to the protocol (PC or AT) selected. In addition, the K25C81 supports commands from and to the system, as described in the IBM Technical Reference Manuals. The following table shows the commands that the system may send and their value in hex.
Command Set/Reset Status Indicators Echo Invalid Command Select Alternate Scan Codes Invalid Command Read ID Set Typematic Rate/Delay Enable Default Disable Set Default Hex Value ED EE EF F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF
These commands are supported in the AT/PS/2 protocol and can be sent to the keyboard at any time. Mode 1 accepts only the `reset' command. Commands shown in italics do not affect the operation of the K25C81. Nevertheless, they are acknowledged and relayed to the external keyboard, if an external standard keyboard is present. The following table shows the commands that the keyboard may send to the system.
Command Key Detection Error/Overrun Keyboard ID BAT Completion Code BAT Failure Code Echo Acknowledge (Ack) Resend Key Detection Error/Overrun Hex Value 00* 83AB AA FC EE FA FE FF*
*Scan Code Set 2 Table 3: Keyboard Commands to the System (AT/PS/2 protocol)
Set All Keys Typematic Make/Break Make Typematic/Make/Break Set Key Type Typematic Make/Break Make
Resend Reset
When an external keyboard is connected, commands from the system will also be directed to the external keyboard. Presence or absence of an external keyboard will not affect the normal operation of the FlexiCoderTM.
Table 2: Keyboard Commands from the System (AT/PS/2 protocol)
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SUGGESTED INTERFACING FOR K25C81-FN (44-PIN PLCC PACKAGE)
VCC U1
1
VCC
2
C1
3
TC54VC4502ECB TELCOM
.1uF
+
JP1 C6 10uF VCC R6
1 2 3
JUPERS SETTINGS JP1 1-2: 2-3 PC/XT PC/AT
VCC R1 R2 R3 R4 2x4.7K 2x2K
44 VCC RST
NC
38
100K
5 12 24 25 26 27 28 29 30 31 21 20 19 17 16 15 14 13 18 40 39 6 37 36 35 34 33 32 C17 C16 C15 C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 C0
1
EXTERNAL_KBD_PS2DATA EXTERNAL_KBD_PS2CLOCK
11 10 41 9 8
EKD EKC EKC1 KC KD
HOST_PS2DATA HOST_PS2CLOCK C2 C3 C4 C5 4x47pF
U2
K25C81-FN PLCC 3 23 VCC 2 4 7 IRQ VX RP ODCO OSCI VSS NC NC
C17 C16 C15 C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 C0 C4A R7A R7 R6 R5 R4 R3 R2 R1 R0
R7 R6 R5 R4 R3 R2 R1 R0
VCC RP1 NET_15K
43
42
R5 1M Y1 4.00MHz AVX PBRC4.00BR
22
(c)1994-2001 USAR SYSTEMS, Inc. Application Circuit for K25C81-FB .6 Document Number K25C81FB.sch Rev
STANDARD KEYMAP FOR K25C81
Rows (R0-R7)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
0 1 F29 F28 Pg Dn Home ] ( v w o p h i a b . , (comma) S T J K A B 1 2 f3 f4 f14 f13 f1 Backspace Ins Esc Back-quote ! '(Apostrophe) " * Typematic Keys
2 End PgUp ) x q j c - (dash) U L C 3 f6 f12 Rt Arrow* Up Arrow* @ <
n n
3 F36 : * y r k d / V M D 4 f5 f15 Dn Arrow* Lft Arrow* >
4 F34 F27 ^ z s l e % W N E 5 f7 f11 F38 R { ?
5 F35 F30 F22 ; t m f & X O F 6 f8 f16 Space Enter } ~
n n
6 F33 F31 F21 [ u n g # Y P G 7 f9 9 F19 $ \ Tab
7 F37 F32 F25 F20 F23 F18 i 0 Z Q H 8 f2 f10 + = | Del
Columns (C0-C17)
Upper case A-Z correspond to Shift a-Shift z F21-F30 correspond to Ctrl F1-Ctrl F10
F11-F20 correspond to Shift F1-Shift F10 F31-... correspond to Alt F1-Alt F10
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2
3
41
38
2x4.7K
RST VCC NC
2x2K
33
SUGGESTED INTERFACING FOR K25C81-FB (44-PIN QFP PACKAGE)
OSCI
ODCO
VSS
37
36
17
7
+
VCC 10uF R6 100K VCC R1 R2 R3 R4
C6
1 2 3
Copyright Semtech, 1997-2001 DOC5-C81-DS-105
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VCC U1
1
VCC
C1 TC54VC4502ECB .1uF JP1 JP1 TELCOM JUPERS SETTING S 1-2: 2-3 PC/ T X PC/A T
EXTERNAL_KBD_PS2DATA
EKD EKC EKC1 KC KD 5 35 4 3
6
EXTERNAL_KBD_PS2CLOCK
HOST_PS2DATA C2 C5 4x47pF
NC NC NC NC 40 39 16 22 VCC 42 IRQ VX RP 43 2 R7 R6 R5 R4 R3 R2 R1 R0 34 1 32 31 30 29 28 27 K25C81-FB QFP44
HOST_PS2CLOCK C3 C4 U2
C17 C16 C15 C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 C0
44 7 18 19 20 21 23 24. 25 26 15 14 13 12 11 10 9 8
C17 C16 C15 C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 C0 R7 R6 R5 R4 R3 R2 R1 R0
VCC RP1 NET_15K
R5 1M Y1 4.00MHz AVX PBRC4.00BR
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(c)1994-2001 USAR SYSTEMS, Inc. Application Circuit for K25C81-FB Document Number K25C81FB.sch Rev .6
MECHANICALS FOR THE K25C81-P
40
21 B L
1
20
A
C J N M F K
Seating Plane
Notes: 1. Positional tolerance of leads (D) shall be within 0.25 mm (0.010) at maximum material condition, in relation to the seating plane and each other. 2. Diminsion L is to the center of the leads when the leads are formed parallel. 3. Dimension B does not include mold flash.
H
G
D
MILLIMETERS
INCHES
DIM A B C D F G H J K L M N
MIN MAX 51.69 52.45 13.72 14.22 3.94 5.08 0.36 0.56 1.02 1.52 2.54 BSC 1.65 2.16 0.20 0.38 2.92 3.43 15.24 BSC 00 15 0 0.51 1.02
MIN MAX 2.035 2.065 0.540 0.560 0.155 0.200 0.014 0.022 0.040 0.060 0.100 BSC 0.065 0.085 0.008 0.015 0.015 0.135 0.600 BSC 00 15 0 0.020 0.040
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MECHANICALS FOR THE K25C81-FN
N
Y BRK
D
L
44 Leads PLCC
M
B
0.18 (0.007) M T N S -P S L S -M S
U W Z1
D
0.18 (0.007)
M
T N S -P S L S -M S
Note 1
(Note 1) 44
1
P V A Z
0.18 (0.007)
M
T L S -M S N S -P S
X View D-D
G1
0.25 (0.010)
M
T N S -P S L S -M S
R
0.18 (0.007)
M
T L S -M S N S -P S
H C
+ +
0.18 (0.007) M T L S -M S N S -P S 0.18 (0.007) M T N S -P S L S -M S
E G
K1 K F
44 (Note 1)
0.18 (0.007) 0.18 (0.007)
M M
T L S -M S N S -P S T N S -P S L S -M S
J G1
0.25 (0.010)
M
Detail S
0.010 (0.004) T
Detail S
Seating Plane
MILLIMETERS INCHES
T L S -M S N S -P S
Notes: 1. Due to space limitation, the chip is represented by a general (smaller) case outline drawing rather than showing all 44 leads. 2. Datums L, M, N, and P determine where the top of the lead shoulder exits plastic body at mold parting line 3. DIM G1, true position to be measured at Datum T, Seating Plane 4. DIM R and U do not include mold protusion. Allowable mold protusion is 0.25 (0.010) per side. 5. Dimensioning and tolerancing per Ansi Y14.5M, 1982 6. Controlling dimension: Inch
DIM A B C E F G H J K R U V W X Y Z G1 K1 Z1
MIN MAX 17.40 17.65 17.40 17.65 4.20 4.57 2.29 2.79 0.33 0.48 1.27 BSC 0.66 0.81 0.51 0.64 16.51 16.66 16.51 16.66 1.07 1.21 1.07 1.21 1.07 1.42 - 0.50 20 10 0 15.50 16.00 1.02 20 10 0
MIN MAX 0.685 0.695 0.685 0.695 0.165 0.180 0.090 0.110 0.013 0.019 0.050 BSC 0.026 0.032 0.020 0.025 0.650 0.656 0.650 0.656 0.042 0.048 0.042 0.048 0.042 0.056 - 0.020 20 10 0 0.610 0.630 0.040 2 10 0
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MECHANICALS FOR THE K25C81-FB
L
33 34 23
DS
B
22
DS
A,B,D
B
0.20 (0.008) M C A-B S 0.05 (0.002) A-B
A
L
B
V
0.20 (0.008)
M
H A-B S
Detail A
Detail A
44 1 11
12
D A
0.20 (0.008) M C A-B S 0.05 (0.002) A-B DS
Notes 1. Dimensioning and tolerancing per Ansi Y14.5-M, 1982 2. Controlling dimension: Millimeter 3. Datum Plane "H" is located at the bottom of the lead and is coincident with the lead where the lead exits the plastic body at the bottom of the parting line. 4. Datums -A-, -B-, and -D- to be determined at Datum Plane -H-. 5. Dimensions S and V to be determined at seating plane -C-. 6. Dimensions A and B do not include Mold protusion. Allowable protusion is 0.25 (0.010) per side. Dimensions A and B do include mold mismatch and are determined at Datum Plane -H-. 7. Dimension D does not include Danbar protrusion. Allowable Danbar protrusion is 0.08 (0.003) total in excess of the D dimension at Maximum Material Condition. Danbar cannot be located on the lower radius or the foot.
MILLIMETERS INCHES
F S
0.20 (0.008)
M
H A-B S
DS
Base Metal
J
N
M T
Datum Plane
D
0.20 (0.008)
M
C A-B S
DS
R
Section B-B
DIM A B C D E F G H J K L M N Q R S T U V W X
H W X M
Detail C
K Q
Detail C
C C Seating Plane
E
H
Datum Plane
0.01 (0.004)
G H M
MIN MAX 9.90 10.10 9.90 10.10 2.10 2.45 0.30 0.45 2.00 2.10 0.30 0.40 0.80 BSC - 0.25 0.13 0.23 0.65 0.95 8.00 REF 50 10 0 0.13 0.17 0 0 70 0.13 .30 12.95 13.45 0.13 00 12.95 13.45 0.40 1.6 REF
MIN MAX 0.390 0.398 0.390 0.398 0.083 0.096 0.012 0.018 0.079 0.083 0.012 0.016 0.031 BSC - 0.010 0.005 0.009 0.026 0.037 0.315 REF 50 10 0 0.005 0.007 0 0 70 0.005 0.012 0.510 0.530 0.005 00 0.510 0.530 0.016 0.063 REF
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ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings Ratings Supply Voltage Input Voltage Current Drain per Pin (not including Vss or Vdd) Operating Temperature K25C81 Storage Temperature Range Symbol Vdd Vin I Ta Tstg Value -0.3 to +7.0 Vss -0.3 to Vdd +0.3 25 T low to T high 40 to +85 -65 to +150 Unit V V mA C C
Thermal Characteristics Characteristic Symbol Value Unit Thermal Resistence Tja C per W Plastic 60 DIP -60 Plcc 70 DC Electrical Characteristics (Vdd=5.0 Vdc +/-10%, Vss=0 Vdc, Temperature range=T low to T high unless otherwise noted) Characteristic Symbol Min Typ Max Unit Output Voltage (I load<10A) Vol 0.1 V Voh Vdd-0.1 Output High Voltage (I load=0.8mA) Voh Vdd-0.8 V Output Low Voltage (I load=1.6mA) Vol: 0.4 V Input High Voltage Vih 0.7xVdd Vdd V Input Low Voltage Vil Vss 0.2xVdd V Supply Current Idd 4.7 7.0 mA I/O Ports Hi-Z Leakage Current Iil +/-10 A Input Current Iin +/- 1 A I/O Port Capacitance Cio 8 12 pF Control Timing (Vdd=5.0 Vdc +/-10%, Vss=0 Vdc, Temperature range=T low to T high unless otherwise noted) Characteristic Symbol Min Max Frequency of Operation fosc Crystal Option 4.0 External Clock Option dc 4.0
Unit MHz
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For sales information and product literature, contact: HID & System Mgmt Division Semtech Corporation 568 Broadway New York, NY 10012 hidinfo@semtech.com http://www.semtech.com 212 226 2042 Telephone 212 226 3215 Telefax
Semtech Western Regional Sales 805-498-2111 Telephone 805-498-3804 Telefax Semtech Central Regional Sales 972-437-0380 Telephone 972-437-0381 Telefax Semtech Eastern Regional Sales 203-964-1766 Telephone 203-964-1755 Telefax Semtech Asia-Pacific Sales Office +886-2-2748-3380 Telephone +886-2-2748-3390 Telefax Semtech Japan Sales Office +81-45-948-5925 Telephone +81-45-948-5930 Telefax Semtech Korea Sales Sales +82-2-527-4377 Telephone +82-2-527-4376 Telefax Northern European Sales Office +44 (0)2380-769008 Telephone +44 (0)2380-768612 Telefax Southern European Sales Office +33 (0)1 69-28-22-00 Telephone +33 (0)1 69-28-12-98 Telefax Central European Sales Office +49 (0)8161 140 123 Telephone +49 (0)8161 140 124 Telefax
Copyright 1997-2001 Semtech Corporation. All rights reserved. KeyCoder, FlexiCoder and Self-Power Management are trademarks of Semtech Corporation. Semtech is a registered trademark of Semtech Company. All other trademarks belong to their respective companies. INTELLECTUAL PROPERTY DISCLAIMER This specification is provided "as is" with no warranties whatsoever including any warranty of merchantability, fitness for any particular purpose, or any warranty otherwise arising out of any proposal, specification or sample. A license is hereby granted to reproduce and distribute this specification for internal use only. No other license, expressed or implied to any other intellectual property rights is granted or intended hereby. Authors of this specification disclaim any liability, including liability for infringement of proprietary rights, relating to the implementation of information in this specification. Authors of this specification also do not warrant or represent that such implementation(s) will not infringe such rights.
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