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USAR SerialCoderTM UR5HC703-600-FG
USAR SerialCoderTM Low-Power Keyboard Encoder interfaces RS-232
Description The USAR SerialCoderTM UR5HC703 is an extremely low-power, "off-the-shelf" 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 SerialCoderTM 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-PowerTM operation, transparent to the host. Power consumption is reduced to just the circuit's leakage when all keys are released. The average current consumption is less than 1A at room temperature and 10A at 85C. 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 -- to protect against unintended and unnecessary discharge of the batteries in the Host. Custom versions of the USAR SerialCoderTM 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 SerialCoderTM is simple to implement. It requires few external components and utilizes a tiny, lowprofile 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 KeyCoderTM family product specifications
Features * 8 x 16 Matrix Encoding * 9600 Baud 8N1Serial Data Format * IC is independent of the keyboard layout * Zero-PowerTM operation, transparent to the Host * Average current consumption of less than 1A at room temperature; 10A at 85C * Customized versions available Applications * Built-in keyboards for HH PDAs/Organizers * Add-on accessory keyboards for Palm and H/PC Devices Pin Assignments
R3 R2 R1 R0 C15 R6 R5 R4
* TTL/CMOS Output-only Asynchronous Serial Interface to the Host (direct connection to the UART) * Very simple serial protocol -- Two-Byte Identification String on power-up; single-Byte Matrixposition for each key-press or key-release * Robust algorithm for Ghost-key elimination
* * * *
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 - A Semtech Company Datasheet
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USAR SerialCoderTM UR5HC703-600-FQ Preliminary USAR KeyCoderTM family product specifications
USAR -- A Semtech Company
Descri
Ordering Code
Package Options 32-pin, Plastic LQFP Pitch in mm's 0.8 Ta=-20 C to +85 C UR5HC703-600-FG
Other Materials USAR SerialCoderTM Eval Kit
Type Evaluation Kit
Order number EVK5-703-600-XXX
Functional Diagram
(R)
USAR SerialCoder TM
Data Buffer Key Matrix Interface R0-R7 16 C0-C15 8
TxD
Communication Interface
Matrix Scan Logic _RESET OSCIN _OSCOUT 4
Reset Logic Oscillator Power Supply
USAR - A Semtech Company Datasheet
DOC5-703-600-DS-102
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USAR SerialCoderTM UR5HC703-600-FQ Preliminary USAR KeyCoderTM family product specifications
USAR -- A Semtech Company
Descri
Pin Definitions
Pin Numbers LQFP Type 8,5 11,7 PWR PWR
Mnemonic Power Supply Vdd, Vdd2 Vss, Vss2 Reset _RESET
Name and Function Positive Supply Voltage Negative Power Supply: Signal Ground Hardware reset pin: Reset Input for orderly start-up. Low logic level is required until power supply reaches minimum operating voltage Oscillator input: Connect ceramic resonator with built-in load capacitors or CMOS clock from external oscillator 2 MHz operating frequency Oscillator Output: Connect resonator with built-in load capacitors or keep open if external oscillator is used Serial Data Output: Idle at high voltage (logical 1), non-inverted Data (direct connection to the UART)
6
I
Oscillator pins OSCI
9
I
_OSCO ceramic
10
O
Host Interface TxD
27
0
Scanned matrix pins ROW0-ROW7
18-25
I, pup
Row matrix inputs: With pulsed pull-up current sources Column matrix output
COL0-COL15
1-4, 12-17 26,28-32
O, nD
USAR - A Semtech Company Datasheet
DOC5-703-600-DS-102
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USAR SerialCoderTM UR5HC703-600-FQ Preliminary USAR KeyCoderTM family product specifications
USAR -- A Semtech Company
Descri
Protocol Serial transmissions are at the rate of 9600 Baud, 8 data bits, no parity, least significant bit is transmitted first, Idle/Stop level is High (logical 1), Start bit level is Low (logical 0), non-inverted Data. Within 5ms after the power-up the IC sends a two-Byte Identifications String of 0xF9, 0xFB. These two Bytes are transmitted only once after each reset of the IC. These two ID values also represent key release action in the locations [Row=1, Column=15] and [Row=3, Column=15] on the key Matrix. Since the values of these Bytes represent release action of the keys, extraneous characters will never be generated, even if synchronization between the Driver and IC is lost, or power fluctuations/erroneous resets are applied to the chip. If logistics of the Driver do not permit "shared" use of the Identification Values 0xF9 and 0xFB, then the user is advised not to incorporate keys in the locations [Row=1, Column=15] and [Row=3, Column=15] for the key Matrix design. Subsequent single-Byte transmissions indicate the Row (0-7), Column (0-15), and Press/Release action for each change of the state of every key. If after the current key release all of the keys on the key Matrix are in the released state, the last transmission is repeated. Host's Driver looking for two Bytes with exactly the same value and key release indication (b7=1) can recognize that the keyboard is completely idle.
Byte Transmission Bit Number b7 b6 b5 b4 b3 b2 b1 b0 Comment 0 for key press, 1 for key release Column location in the key Matrix (0-15)
Row location in the key Matrix (0-7)
USAR - A Semtech Company Datasheet
DOC5-703-600-DS-102
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USAR SerialCoderTM UR5HC703-600-FQ Preliminary USAR KeyCoderTM family product specifications
USAR - A Semtech Company Datasheet
2 4 R 6 25 R7 C11 C12 TXD C13 C8 13 12 11 C9 14 16 15 26 R 5 R 4 R 3 R 2 R 1 R 0 C 1 5 2 3 2 2 2 1 2 0 1 9 1 8 1 7
To Keyboard Matrix
U1
C10
27 28 29 C14 32-pin LQFP VSS C0 C1 C2 V D CCCCD 34562 V D D GND 8 1 2 3 4 5 6 7 R E S E T V S S 2 2.00MHz C7 30 31 32 OSCOUT 10 OSCIN 9
UR5HC703_600_FG
Sample Schematic for the USAR UR5HC703-600-FG
DOC5-703-600-DS-102
Y1
POWER
C1
GND .1uF GND 2.2uF 10V GND
C2
TxD
9600 Baud IDLE=HIGH GND
CMOS_TTL_TxD GROUND
5
U2
1 OUT VDD 3 2
(C)1999-2000, USAR Systems - A Semtech Company App Circuit for UR5HC703-600-FG REV 0.7
USAR -- A Semtech Company
GND Voltage Detector 2.2V or Higher GND
USAR SerialCoderTM UR5HC703-600-FQ Preliminary USAR KeyCoderTM family product specifications
USAR -- A Semtech Company
USAR SerialCoderTM Electrical Characteristics
Absolute Maximum Ratings Ratings Symbol (VSS = 0V, Ambient Temperature TA is in the range TLOW to THIGH) Supply Voltage VDD Input voltage: All input pins VIN Output current: Total peak for all pins IOH (Peak) IOL (Peak) Total average for all pins IOH (Avg) IOL (Avg) Peak for each pin IOH (Peak) IOL (Peak) Average for each pin IOH (Avg) IOL (Avg) Temperature range Operating Temperature TLOW to THIGH Storage Temperature TSTG Value -0.3 to +7.0 -0.3 to VDD +0.3 -80 80 -40 40 -10 10 -5 5 -20 -40
TO TO
Unit V V
mA mA mA mA 85 125 C C
DC Electrical Characteristics, Temperature range=T low to T high unless otherwise noted) Characteristic Symbol Min Typ Max Operating Voltage Input Voltage High LOW VDD VIH VIL VIL (_RESET) VIL (OSCIN) lIH lIH (OSCIN) Input Current Low IIL IIL (OSCIN) Output Voltage VOH IOH=-1.0mA VOL IOL=1.0mA Power Consumption IDD ONE OR MORE KEYS ARE DEPRESSED IDD ALL KEYS ARE RELEASED TA=25C TA=85C 600 VDD-1.0 VDD 1.0 -5.0 -4.0 2.2 .8 VDD 0 0 0 5.5 VDD .3 VDD .2 VDD .16 VDD 5.0 4.0
Unit V V V V V A A A A
Input Current High
V V A
.1
1.0 10.0
A A
Control Timing (Vdd=2.2 to 5.5 V, Vss=0 Vdc, Temperature range=T low to T high unless otherwise noted) Characteristic Symbol Value Unit Frequency of Operations fosc Ceramic Resonator with built-in load capacitors External Oscillator 2.0 2.0 MHz MHz
Note: Communications Baud Rate and Active-state power consumption are scaled linearly with operating frequency. Higher operating frequencies are possible within a reduced operating voltage range. Consult USAR for further information.
USAR - A Semtech Company Datasheet
DOC5-703-600-DS-102
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USAR SerialCoderTM UR5HC703-600-FQ Preliminary USAR KeyCoderTM family product specifications
USAR -- A Semtech Company
Mechanicals for the UR5HC703-600 LQFP Package
HD D
32 25
e
F
1 24
y b
8
17
L1
9
16
Symbol
c
L Detail F
A
MD e
A A1 A2 b c D E e HD HE L L1 y b2 I2 MD ME
I2 Recommended PCB Footprint
Dimension in Millimeters Min Nom Max - - 1.7 0.1 0.2 0 1.4 - - 0.3 0.35 0.45 0.105 0.125 0.175 6.9 7.0 7.1 6.9 7.0 7.1 0.8 - - 8.8 9.0 9.2 8.8 9.0 9.2 0.3 0.5 0.7 1.0 - - 0.1 - - 0 10 - 0.5 - - - - 1.0 - - 7.4 - - 7.4
A1
A2
b2
ME
USAR - A Semtech Company Datasheet
DOC5-703-600-DS-102
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E HE
A Semtech Company
For sales information and product literature, contact: USAR - A Semtech Company 568 Broadway New York, NY 10012 info@usar.com http://www.usar.com 212 226 2042 Telephone 212 226 3215 Telefax
In Japan: Semtech Japan Tel: 81-45-948-5925 Fax: 81-45-948-5930 In Taiwan: Semtech Asia/Pacific Sales Tel: 011-886-2-2748-3380 Fax: 011-886-2-2748-3390 Koryo Electronics Co., Ltd. Telephone +886-2-2698-1143 E-mail alex.chen@koryo.com.tw In Korea: Semtech Korea Tel: 011-82-2-527-4377 Fax: 011-82-2-527-4376 In Europe Semtech Limited Tel: +44-1592-630350 Fax: +44-1592-774781
Copyright 2000 USAR - A Semtech Company. All rights reserved. KeyCoder, SerialCoder and Zero-Power are trademarks of USAR Systems, Inc. USAR and the USAR logo are registered trademarks of USAR - A Semtech Company. All other trademarks belong to their respective companies. INTELLECTUAL PROPERTY DISCLAIMER This specification is provided "as is" with no warranties whatsoever including any warranty of merchantability, fitness for any particular purpose, or any warranty otherwise arising out of any proposal, specification or sample. A license is hereby granted to reproduce and distribute this specification for internal use only. No other license, expressed or implied to any other intellectual property rights is granted or intended hereby. Authors of this specification disclaim any liability, including liability for infringement of proprietary rights, relating to the implementation of information in this specification. Authors of this specification also do not warrant or represent that such implementation(s) will not infringe such rights.

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