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PDF UR5HC418-FB Data sheet ( Hoja de datos )

Número de pieza UR5HC418-FB
Descripción AT / PS/2 - Compatible Keyboard Encoder
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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DeskCoderTM UR5HC418
AT / PS/2 - Compatible
Keyboard Encoder
HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODERTM FAMILY
DESCRIPTION
The DeskCoderTM keyboard encoder
functions as a versatile, low-power
desktop keyboard encoder, while
providing two bi-directional
channels for communication with a
BIOS-compatible system as well as
any optional keyboard-compatible
devices, such as a 101/102/104
desktop keyboard, OCR, barcode
reader, etc.
The DeskCoderTM fully supports the
IBM standard keyboard communi-
cation protocol; each key press
generates one of the scan codes
designated in the IBM Technical
Reference Manuals. The keyboard
encoder handles the scanning,
debounce, and encoding of 128
keys organized on an 8 x 16 matrix.
In addition to the system’s keyboard
communication port, the UR5HC418
provides a fully functional keyboard
input port that can be used by a
standard 101/102/104 keyboard or
another 8042-compatible device,
such as an external numeric
keypad, an OCR, or a bar-code
reader. Input from both the matrix
and the external device is
multiplexed and presented to the
system as if it were coming from a
single source.
The DeskCoderTM is ideal for use in
low-power, low-cost and high-
reliability AT / PS/2 - compatible
keyboard designs.
Note: A version of the IC that
supports the PC/XT protocol is also
available. Contact Semtech for
more information.
FEATURES
• Interfaces contact switch matrix
keyboards to a BIOS-compatible
system
• Single IC desktop keyboard
encoder
• Provides interface for an external
keyboard/keypad or other 8042-
compatible devices
• AT / PS/2 - compatible
APPLICATIONS
• Desktop computers
• Instrumentation
• Industrial keyboards
PIN ASSIGNMENTS
• Implements all functions of a
101/102/104 keyboard
• Low-power HCMOS
microcontroller, suitable for 3-volt
battery-operated systems
• Available in DIP, PLCC and QFP
packages
• Custom versions available in small
or large quantities
• Point of sales terminals
• Public information kiosks
_RESET 1
40 VCC
_IRQ 2
39 OSCI
VX 3
38 OSCO
NL 4
37 EKC1
R6 5
36 R7
RP 6
35 SL
KD 7
34 R5
KC 8
33 R4
EKC 9
32 R3
EKD 10 DIP 31 R2
CL 11
30 R1
C0 12
29 R0
C1 13
28 C8
C2 14
27 C9
C3 15
26 C10
C4 16
25 C11
C5 17
24 C12
C6 18
23 C13
C7 19
22 C14
VSS/GND 20
21 C15
RP
KD
KC
EKC
EKD
CL
C0
C1
C2
C3
C4
6
7
12
17
18
R6
RP
KD
KC
EKC
EKD
CL
C0
C1
C2
C3
1
1
PLCC
23
QFP
40
39 R7
SL
R5
R4
R3
34 R2
R1
R0
C8
C9
29 C10
28
NL
R5
R4
R3
R2
R1
R0
C8
C9
C10
C11
DeskCoder and KeyCoder are trademarks of
Semtech Corporation. All other trademarks
belong to their respective companies.
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
1
www.semtech.com

1 page




UR5HC418-FB pdf
8042 EMULATION CHANNEL
The DeskCoderTM fully emulates a
systems keyboard port, available to
a standard 84/85/101/102 external
keyboard or other 8042-compatible
device. Communication with a
keyboard-compatible device is
accomplished by clock and data
lines via EKC and EKD pins,
respectively. A third pin, EKC1 that
connects to the clock line, interrupts
the controller whenever the external
device initiates a communication
session. When power is first
applied, the controller proceeds
with the standard reset sequence
with the external device. Data and
commands initiated from the
external device are buffered in the
controllers FIFO along with data
from the scanned matrix, and then
are presented to the system as if
they were coming from a single
source. Once they are
acknowledged, commands and
data from the system are then
transmitted to the external device.
PC COMMUNICATION
The DeskCoderTM implements all
the standard functions of
communication with a BIOS-
compatible PC/XT or AT/PS/2 host
system. Two lines, KC and KD,
provide bi-directional clock and
data signals. In addition, the
DeskCoderTM supports all
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 values in
hexadecimal.
Command
Hex Value
Set/Reset Status
ED
Indicators
Echo
EE
Invalid Command
EF
Select Alternate
F0
Scan Codes
Invalid Command
F1
Read ID
F2
Set Typematic
F3
Rate/Delay
Enable
F4
Default Disable
F5
Set Default
F6
Set All Keys
Typematic
F7
Make/Break
F8
Make
F9
Typematic/Make/Break FA
Set Key Type
Typematic
FB
Make/Break
FC
Make
FD
Resend
FE
Reset
FF
Table 2: Keyboard Commands from the
System (AT / PS/2 protocol)
The following table shows the
commands that the keyboard may
send to the system.
Command
Hex Value
Key Detection
Error/Overrun
00*
Keyboard ID
83AB
BAT Completion Code
AA
BAT Failure Code
FC
Echo
EE
Acknowledge (Ack)
FA
Resend
FE
Key Detection
Error/Overrun
FF**
*Code Sets 2 and 3
**Code Set 1
Table 3: Keyboard Commands to the
System (AT/PS/2 protocol)
When an external keyboard is
connected, commands from the
system are also directed to the
external keyboard. Presence or
absence of an external device does
not affect the normal operation of
the UR5HC418.
These commands are supported in
the AT / PS/2 protocol and can be
sent to the keyboard at any time.
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
5
www.semtech.com

5 Page





UR5HC418-FB arduino
MECHANICALS FOR THE UR5HC418-FN
N Y BRK
L
44
Leads
PLCC
M
W
D
B 0.18 (0.007) M T N S -P S L S -M S
U 0.18 (0.007) M T N S -P S L S -M S
Note 1
Z1
(Note 1) 44
1
D
P
V
A 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
Z R 0.18 (0.007) M T L S -M S N S -P S
0.18 (0.007) M T L S -M S N S -P S
H 0.18 (0.007) M T N S -P S L S -M S
C
44
(Note 1)
++
G
E
J
G1 Detail S
0.25 (0.010) M T L S -M S N S -P S
K1
0.010 (0.004)
T Seating Plane
K
F
Detail S
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
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
MILLIMETERS INCHES
DIM MIN MAX MIN MAX
A 17.40 17.65 0.685 0.695
B 17.40 17.65 0.685 0.695
C 4.20 4.57 0.165 0.180
E 2.29 2.79 0.090 0.110
F 0.33 0.48 0.013 0.019
G 1.27 BSC 0.050 BSC
H 0.66 0.81 0.026 0.032
J 0.51 - 0.020 -
K 0.64 - 0.025 -
R 16.51 16.66 0.650 0.656
U 16.51 16.66 0.650 0.656
V 1.07 1.21 0.042 0.048
W 1.07 1.21 0.042 0.048
X 1.07 1.42 0.042 0.056
Y - 0.50 - 0.020
Z 2 0 10 0 2 0 10 0
G1 15.50 16.00 0.610 0.630
K1 1.02 - 0.040 -
Z1 2 0 10 0 2
10 0
Copyright ©1997-2001 Semtech Corporation
DOC5-418-DS-109
11
www.semtech.com

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