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SerialCoder鈩?IR UR5HC703-IR20

Extremely Low-Power Keyboard

Encoder Interfaces IrDA

HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODER鈩?FAMILY

DESCRIPTION

The SerialCoder鈩?IR UR5HC703-

IR20 is an extremely low-power, 鈥渙ff-

the-shelf鈥?infrared serial keyboard

encoder. Robust, tiny and flexible,

the IC is a good match for any

application where a low-cost

wireless keyboard is attractive and

an IrDA host is available.

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

typical current consumption is less

than 1碌A(chǔ) at room temperature and

10碌A(chǔ) at 85擄C.

If a key or group of keys stays in the

depressed position for ten minutes

(with no other keyboard activity), the

IC shuts down to save power.

The SerialCoder鈩?IR is simple to

implement. It requires few external

components and utilizes a tiny, low-

profile 32-pin LQFP package that

measures 7mm x 7mm.

FEATURES

鈥?8 x 16 Matrix Encoding

鈥?IC is independent of the keyboard

layout

鈥?Extremely low-power operation,

transparent to the host

鈥?Typical current consumption of

less than 1碌A(chǔ) at room

temperature; 10碌A(chǔ) at 85擄C

鈥?Robust algorithm for ghost-key

elimination

鈥?CMOS output-only asynchronous

serial interface to the host using

standard IrDA

鈥?9600 Baud 8N1 serial data format

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?Low-cost wireless keyboard

solution

PRELIMINARY

APPLICATIONS

鈥?Infrared wireless keyboards

鈥?Personal digital assistant (PDA)

keyboard

鈥?Instrumentation

PIN ASSIGNMENTS

鈥?Remote control

鈥?Home entertainment or

automation

ROW7

COL12

TXD

COL13

COL14

COL0

COL1

COL2

32

1

25

24

COL3

COL4

COL5

COL6

VDD2

RESET

VSS2

VDD

8

9

UR5HC703-IR20-FG

LQFP

ROW6

ROW5

ROW4

ROW3

ROW2

ROW1

ROW0

COL15

17

16

SerialCoder is a trademark of Semtech

Corporation. All other trademarks belong to their

respective companies.

Copyright 漏1999-2001 Semtech Corporation

DOC5-703-IR20-DS-101

1

OCSIN

OSCOUT

VSS

COL7

COL8

COL9

COL10

COL11

www.semtech.com

next

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