UR5HCFJL Datasheet, PDF (1/20 Pages) Semtech Corporation – Zero-PowerTM Keyboard Encoder for Portable Systems

GreenCoder^TM UR5HCFJL
Zero-Power^TM Keyboard
Encoder for Portable Systems
HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODER^TM FAMILY
DESCRIPTION
The GreenCoder^TM (UR5HCFJL) is
a unique, Zero-Power^TM keyboard
encoder that provides an optimum
performance level for both battery-
operated and desktop systems.
The GreenCoder^TM 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 GreenCoder^TM employs a
unique Self-Power Management^TM
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 GreenCoder^TM
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
SL
OPT
R5
KD
R4
KC
R3
EKC
R2
EKD
QFP
R1
CL
R0
C0
C8
C1
C9
C2
C10
C3
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 GreenCoder^TM 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
1
DOC5-FJL-DS-106
www.semtech.com