SerialCoder廬 600 UR5HC703-600
Extremely Low-Power Keyboard
Encoder Interfaces RS-232
HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODER廬 FAMILY
DESCRIPTION
The SerialCoder廬 600
UR5HC703-600 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 complicated
keyboard protocols are not required
and asynchronous serial interface
hardware is available.
The SerialCoder廬 600 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 extremely low-power
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 at room temperature and 10 碌A
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?to protect against
unintended and unnecessary
discharge of the batteries in the
host.
The SerialCoder廬 600 is simple to
implement. It requires few external
components and utilizes a tiny, low-
profile 32-pin LQFP package that
measures 7mm x 7mm.
Semtech also offers other products
in the SerialCoder廬 series.
FEATURES
鈥?8 x 16 matrix encoding
鈥?9600 Baud 8N1 serial data format
鈥?IC is independent of the
keyboard layout
鈥?Extremely low-power operation,
transparent to the host
鈥?Average current consumption of
less than 1 碌A at room
temperature; 10 碌A at 85擄C
鈥?TTL/CMOS output-only
asynchronous serial interface
to the host (direct connection to
the UART)
鈥?Very simple serial protocol 鈥?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
PRELIMINARY
APPLICATIONS
鈥?Add-on accessory keyboards for
personal digital assistants (PDAs)
and hand-held PCs (H/PCs)
鈥?Built-in keyboards for PDAs and
H/PCs
PIN ASSIGNMENTS
COL02
COL01
COL00
COL14
COL13
TxD
COL12
ROW7
32
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Portable personal computers
Instrumentation
Remote control
Cellular phones
COL03
COL04
COL05
COL06
VDD2
RESET
VSS2
VDD
8
9
UR5HC703-600-FG
LQFP
ROW6
ROW5
ROW4
ROW3
ROW2
ROW1
ROW0
COL15
17
16
Semtech, SerialCoder, and KeyCoder are
registered trademarks of Semtech Corporation.
All other trademarks belong to their respective
companies.
Copyright 漏1999-2002 Semtech Corporation
DOC5-703-600-DS-106
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OCSIN
OSCOUT
VSS
COL07
COL08
COL09
COL10
COL11
www.semtech.com
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