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UR5HCFJL 데이터시트 PDF




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부품번호 UR5HCFJL 기능
기능 Zero-PowerTM Keyboard Encoder for Portable Systems
제조업체 Semtech Corporation
로고 Semtech Corporation 로고


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UR5HCFJL 데이터시트, 핀배열, 회로
GreenCoderTM UR5HCFJL
Zero-PowerTM Keyboard
Encoder for Portable Systems
HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODERTM FAMILY
DESCRIPTION
The GreenCoderTM (UR5HCFJL) is
a unique, Zero-PowerTM keyboard
encoder that provides an optimum
performance level for both battery-
operated and desktop systems.
The GreenCoderTM scans,
debounces and encodes an 8 X 16
keyboard matrix, and will provide
direct drive for 3 LEDs and two
bi-directional channels for
communication with a BIOS-
compatible system as well as an
additional keyboard-compatible
device. It fully supports all three
PS/2 scan code sets and will
implement up to three alternate
keyboard layers for full 101/102
functionality.
FEATURES
Optimized power-saving operation
with idle consumption of less
than 2 µA
Programmable LED dimming for
further power savings
Ready to interface to Fujitsu's
7316, 7654,7656, and
1406 keyboards
3, 3.3 and 5 Volt operation
Wakes-up only to respond to an
external event and for a minimum
period of time (2 mA current
consumption)
Provides interface for external
keyboard/keypad or other 8042-
compatible device
Custom versions available in small
or large quantities
APPLICATIONS
Laptop/Notebook
Portable Equipment
Energy Star Compliant
Medical Instruments
Palmtops/ PDAs
PIN ASSIGNMENTS
The GreenCoderTM employs a
unique Self-Power ManagementTM
method that reduces the power
consumption of the keyboard
sub-system to an unprecedented
minimum, transparently and without
user intervention. In “Active” mode,
the encoder consumes less than 2
mA (Typ @5V). In “Sleep” mode the
encoder consumes less than 2 µA
(Typ @5V) The encoder can even
nap between keystrokes and
therefore it is rarely active and
rarely consumes significant levels of
power.
A "stand-by" mode (600 µA Typ
@5V) is entered for as long as
a periodic task is active. After a
programmed period of user
inactivity the GreenCoderTM
gradually dims the LEDs for
further power savings.
_RESET 1
40 VCC
DRV 2
39 OSCI
VX 3
38 OSCO
NL 4
37 EKC1
R6 5
36 R7
OPT 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
GND 20
21 C15
R6
OPT
KD
KC
EKC
EKD QFP
CL
C0
C1
C2
C3
SL
R5
R4
R3
R2
R1
R0
C8
C9
C10
C11
OPT
KD
KC
EKC
EKD
CL
C0
C1
C2
C3
C4
6
7
12
17
18
1
PLCC
23
40
39 R7
SL
R5
R4
R3
34 R2
R1
R0
C8
C9
29 C10
28
The GreenCoderTM is ideal for use in
battery laptop/notebook designs
and Energy Star compliant
keyboards.
GreenCoder is a trademark of Semtech Corp. All
other trademarks belong to their respective
companies.
Copyright Semtech, 1997-2001
DOC5-FJL-DS-106
1
www.semtech.com




UR5HCFJL pdf, 반도체, 판매, 대치품
KEYBOARD ENCODER, (CONT)
Embedded Numeric Keypad
MODE CONTROL
N-Key Rollover
The GreenCoderTM implements an
embedded numeric keypad. The
Numeric Keypad Function is
invoked by pressing the Num Lock
Key.
FN Key
A special FN Key has been
implemented to perform the
following functions while it is held
pressed:
Function Key F1 becomes F11
Function Key F2 becomes F12
Control Left Key becomes Ctrl
Right
Embedded numeric keypad keys
become regular keys
If Num Lock is not set:
Embedded numeric keypad keys
provide the same codes as a
numeric keypad when the Num
Lock is not set (Arrow keys, PgUp,
PgDn, etc.)
Status LED indicators
The controller provides an interface
for three LED shift status indicators.
All three pins are active low to
indicate the status of the host
system (Num Lock, Caps Lock and
Scroll Lock) and are set by the
system. After approximately a one-
minute period of keyboard inactivity,
LEDs are dimmed to conserve
power. They are set to full
brightness again upon a new
keystroke.
In this mode, the code(s) corresponding to each key press are transmitted
to the host system as soon as that key is debounced, independently of the
release of other keys.
If a key is defined to be Typematic, the corresponding make code(s) will be
transmitted while the key is held pressed. When a key is released, the
corresponding break code(s) are then transmitted to the host system. If the
released key happens to be the most recently pressed, then Typematic
action is terminated. There is no limitation in the number of keys that can
be held pressed at the same time. However, two or more key closures,
occurring within a time interval less than 5 mS, will set an error flag and will
not be processed. This procedure protects against effects of accidental key
presses.
“Ghost” Keys
In any scanned contact switch matrix, whenever three keys defining a
rectangle on the switch matrix are held pressed at the same time, a fourth
key positioned on the fourth corner of the rectangle is sensed as being
pressed. This is known as the ghostor phantomkey problem. Although
the problem cannot be totally eliminated without using external hardware,
there are methods to neutralize its negative effects for most practical
applications. Keys that are intended to
be used in combinations or are likely to
Actual key presses
be pressed at the same time by a fast
typist (i.e., keys located in adjacent
positions on the keyboard) should be
placed in the same row or column of the
matrix whenever possible. Shift Keys
Ghost
(Shift, Alt, Ctrl) should not reside in the
Key
same row (or column) with any other
keys. The GreenCoderTM has built-in
mechanisms to detect the presence of a
ghostkey, thus eliminating the
necessity of external hardware.
Figure 1: Ghostor PhantomKey
Problem
Copyright Semtech, 1997-2001
DOC5-FJL-DS-106
4
www.semtech.com

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UR5HCFJL 전자부품, 판매, 대치품
STATES OF OPERATION
The GreenCoderTM has three states
of operation, implemented to
minimize the power consumption of
the keyboard subsystem. The
following diagram illustrates the
three states of operation of the
GreenCoderTM.
SLEEP
STATE
STAND BY
STATE
USING THE GREENCODERTM FOR SYSTEM MANAGEMENT TASKS
The GreenCoderTM provides an ideal complement to low-power chip sets
targeted to the portable and mobile computing market. The GreenCoderTM
can be used to handle several system management tasks for small, portable
system designs, thus saving space and additional components for the
System Designer. Such system management tasks include those listed
below.
However, since most of the system management tasks are application and
hardware-dependent, detailed implementation information is outside the
scope of this document. For application examples and sample schematics,
contact Semtech Technical Support.
ACTIVE
STATE
Figure 2: States of Operation of
UR5HCFJL
Most of the time, the GreenCoderTM
is in the Sleep State. Power
consumption in this state is
approximately 2 µA at 5 Volts of
operation. The GreenCoderTM enters
the Active State only when there is
an event to process, such as a
keystroke, a command from the
system, or data from the external
PS/2-compatible device.
System shut-down/wake-up signal
The GreenCoderTM can provide the system power management unit with a
shut-down/wake-up signal which can be invoked either by a special
keyboard combination or after a programmed period of user inactivity.
Note: Self-Power ManagementTM is a feature protected under Semtech Corp. patent and copyright rights.
Purchase of any version of the UR5HCFJL encoder conveys a license to utilize the Self-Power Management
feature only through use of the UR5HCFJL in a PS/2-compatible keyboard subsystem.
The GreenCoderTM enters and stays
in the Stand-By State if an external
device is connected to the auxiliary
port or if one or more LEDs are
turned on.
In the Stand-By State, the IC
consumes approximately 600 µA at
5 Volts. Transition from one state to
the other does not require any input
from the system.
Copyright Semtech, 1997-2001
DOC5-FJL-DS-106
7
www.semtech.com

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