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What is UR5HCFJ8-P?

This electronic component, produced by the manufacturer "Semtech Corporation", performs the same function as "Low-Power Keyboard Encoder for Portable Systems".


UR5HCFJ8-P Datasheet PDF - Semtech Corporation

Part Number UR5HCFJ8-P
Description Low-Power Keyboard Encoder for Portable Systems
Manufacturers Semtech Corporation 
Logo Semtech Corporation Logo 


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LapCoderTM UR5HCFJ8
Low-Power Keyboard
Encoder for Portable Systems
HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODERTM FAMILY
DESCRIPTION
The LapCoderTM is a versatile, low-
power keyboard encoder for
portable systems. The UR5HCFJ8
provides two bi-directional channels
for communication with a BIOS-
compatible system as well as
any optional keyboard-compatible
devices, such as a 101/102 desktop
keyboard.
FEATURES
• Interfaces the Fujitsu FKB7211 or
other similar laptop/notebook
keyboards to a BIOS-compatible
systems
• AT / PS/2-compatible
• Interfaces an external keyboard /
keypad or other 8042-compatible
devices
• Low-power, single IC suitable for
3V battery-operated systems
• Implements all functions of an
101/102 keyboard with only
82-keys
• Available in DIP, PLCC and Quad
Flat packages
• Custom versions available in small
or large quantities
The UR5HCFJ8 fully supports the
IBM standard keyboard
communication 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 82 keys organized on
an 8x16 matrix and supports
embedded numeric keypad
functions as well as alternate scan
codes for specific keys, so that a
keyboard with only 82 keys is able
to emulate the functionality of a
101/102 keyboard.
In addition to the system’s keyboard
communication port the UR5HCFJ8
provides a fully functional keyboard
input port that can be used by a
standard 82/101/102 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 features of UR5HCFJ8 make it
ideal for use in PC/AT/PS/2
laptop/notebook designs that utilize
the Fujitsu FKB7211 low-profile, full-
travel membrane keyboard.
APPLICATIONS
• Laptop/Notebook
• Portable Equipment
• Industrial Keyboards
PIN DESCRIPTIONS
• POS Terminals
• Public Information Kiosks
6
_RESET
_IRQ
VX
NL
R6
RP
KD
1
2
3
4
5
6
7
RP 7
KD
KC
40 VCC
EKC
EKD
39 OSCI
CL 12
38 OSCO C0
37 EKC1
36 R7
35 SL
34 R5
C1
C2
C3
C4 17
18
KC 8
33 R4
EKC
EKD
CL
9
10
11
32 R3
DIP 31 R2
30 R1
C0 12
29 R0
C1 13
C2 14
C3 15
C4 16
C5 17
C6 18
C7 19
VSS 20
28 C8
27 C9
26 C10
25 C11
24 C12
23 C13
22 C14
21 C15
R6
RP
KD
KC
EKC
EKD
CL
C0
C1
C2
C3
1
PLCC
23
40
39 R7
SL
R5
R4
R3
34 R2
R1
R0
C8
C9
29 C10
28
QFP
SL
R5
R4
R3
R2
R1
R0
C8
C9
C10
C11
LapCoder is a trademark of Semtech Corp. All
other trademarks belong to their respective
companies.
Copyright Semtech, 1997-2001
DOC5-FJ8-DS-107
1
www.semtech.com

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UR5HCFJ8-P equivalent
SPECIAL HANDLING
Hot Plug-Ins of External
Device
The UR5HCFJ8 will detect the
presence of an external device.
If an external keyboard or other
device was not connected during
power-on and is connected at a
later time, the encoder will proceed
with the normal reset routine in
order to properly initialize the
external keyboard. After
communication has been
established, the encoder will
continue to check for the presence
of the external keyboard. While the
external device is connected, the
encoder will not enter the sleep
mode. If the device is
disconnected at a later time, the
encoder will become aware of it.
If a subsequent connection takes
place, the controller will reinitiate a
reset sequence. This unique
feature allows the user to connect
or disconnect an external device at
any time without having to reset the
system.
Shift Status LEDs
Shift Status LEDs (Num Lock, Caps
Lock and Scroll Lock) indicate the
status of the system and are
controlled by commands sent from
the system. Set/Reset Status
Indicator commands from the
system will be executed both by the
external keyboard and the scanned
matrix. For example, if the user
presses the Caps Lock Key on
either keyboard, the Caps Lock
LED will be affected in both
keyboards. The LED status
indicators are properly set after
every new connection of an external
keyboard.
PC COMMUNICATION
The UR5HCFJ8 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
UR5HCFJ8 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 hex.
Command
Hex Value
Set/Reset Status
Indicators
ED
Echo
EE
Invalid Command
EF
Select Alternate
Scan Codes
F0
Invalid Command
F1
Read ID
F2
Set Typematic
Rate/Delay
F3
Enable
F4
Default Disable
F5
Set Default
F6
Set All Keys
Typematic
Make/Break
Make
Typematic/Make/Break
F7
F8
F9
FA
Set Key Type
Typematic
Make/Break
Make
FB
FC
FD
Resend
FE
Reset
FF
Table 2: Keyboard Commands from the
System (AT/PS/2 protocol)
These commands are supported in
the AT/PS/2 protocol and can be
sent to the keyboard at any
time.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)
8042 Emulation Channel
The UR5HCFJ8 fully emulates a
systems keyboard port, available to
a standard 82/101/102 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,
connects to the Clock Line and
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. After they are
acknowledged, commands and
data from the system are
transmitted to the external device.
Copyright Semtech, 1997-2001
DOC5-FJ8-DS-107
5
www.semtech.com


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