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Details, datasheet, quote on part number:UR5HC703-600-FQ
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Datasheet text preview:
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 1µA at room temperature and 10µA at 85°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 -- 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 1µA at room temperature; 10µA at 85°C · 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
®
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
2
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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