USAR SerialCoder
TM
UR5HC703-600-FG
USAR SerialCoder
TM
Low-Power Keyboard Encoder
interfaces RS-232
Description
The USAR SerialCoder
TM
UR5HC703 is an extremely
low-power, 鈥渙ff-the-shelf鈥?serial
keyboard encoder. Robust, tiny
and flexible, the IC is a good
match for any application where
the use of complicated keyboard
protocols are not required and
where asynchronous serial
interface hardware is available.
The USAR SerialCoder
TM
provides
unprecedented power
consumption minimization, making
it ideal for use in add-on keyboards
for handheld and cellular / web
phones and single-board systems
designed for portable applications.
The IC provides Zero-Power
TM
operation, transparent to the host.
Power consumption is reduced to
just the circuit鈥檚 leakage when all
keys are released. The average
current consumption is less than
1碌A(chǔ) at room temperature and 10碌A(chǔ)
at 85擄C. If a single key or groups
of keys are stuck in the depressed
position, the IC will enter a total
shutdown after a 10-minute wait 鈥?/div>
to protect against unintended and
unnecessary discharge of the
batteries in the Host.
Custom versions of the USAR
SerialCoder
TM
are available with
Hardware Handshaking for the
Communication channel, support
for extra-low-power operations of
the Host, various baud rates and
Full-Duplex I/O, etc. The USAR
SerialCoder
TM
is simple to
implement. It requires few external
components and utilizes a tiny, low-
profile 32-pin LQFP package that
measures 7mm x 7mm.
Copyright 2000 USAR Systems, Inc. All rights
reserved.
DOC5-703-600-DS-102
A Semtech Company
Preliminary
USAR KeyCoder
TM
family
product specifications
Features
鈥?8 x 16 Matrix Encoding
鈥?9600 Baud 8N1Serial Data Format
鈥?IC is independent of the
keyboard layout
鈥?Zero-Power
TM
operation,
transparent to the Host
鈥?Average current consumption of
less than 1碌A(chǔ) at room
temperature; 10碌A(chǔ) at 85擄C
鈥?Customized versions available
Applications
鈥?Built-in keyboards for HH
PDAs/Organizers
鈥?Add-on accessory keyboards for
Palm and H/PC Devices
Pin Assignments
R3
R2
R1
R0
C15
R6
R5
R4
鈥?TTL/CMOS Output-only
Asynchronous Serial Interface
to the Host (direct connection to
the UART)
鈥?Very simple serial protocol 鈥?/div>
Two-Byte Identification String on
power-up; single-Byte Matrix-
position for each key-press or
key-release
鈥?Robust algorithm for Ghost-key
elimination
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Portable Personal Computers
Instrumentation
Remote Control
Cellular Phones
24
25
R7
C12
TxD
C13
C14
C0
C1
C2
17
16
C11
C10
C9
UR5HC703-600-FG
LQFP
C8
C7
VSS
_OSCOUT
OSCIN
32
1
VDD2
C6
C5
C4
C3
VDD
VSS2
_RESET
9
8
USAR 鈥?A Semtech Company
Datasheet
1
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英文版
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