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Details, datasheet, quote on part number:UR5HC703-600
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| Part: | UR5HC703-600 |
| Category: | Interface and Interconnect => KeyCoders |
| Description: | SerialCoder® 600 - Serial-interface Keyboard Encoder For Accessory Keyboards For Hand-held Devices |
| Company: | Semtech Corporation |
| Datasheet: | Download UR5HC703-600 datasheet File size : 83 kB |
| Request For quote: | Find where to buy UR5HC703-600
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Datasheet text preview:
SerialCoder® 600 UR5HC703-600 Extremely Low-Power Keyboard Encoder Interfaces RS-232
HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODER® FAMILY DESCRIPTION The SerialCoder® 600 UR5HC703-600 is an extremely lowpower, "off-the-shelf" 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® 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's leakage when all keys are released. The average current consumption is less than 1 µA at room temperature and 10 µA 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. The SerialCoder® 600 is simple to implement. It requires few external components and utilizes a tiny, lowprofile 32-pin LQFP package that measures 7mm x 7mm. Semtech also offers other products in the SerialCoder® series. FEATURES · 8 x 16 matrix encoding · 9600 Baud 8N1 serial data format · IC is independent of the keyboard layout · Extremely low-power operation, transparent to the host · Average current consumption of less than 1 µA at room temperature; 10 µA at 85°C · TTL/CMOS output-only asynchronous serial interface to the host (direct connection to the UART) · Very simple serial protocol -- twobyte identification string on powerup; single-byte matrix-position for each key-press or key-release · Robust algorithm for ghost-key elimination PRELIMINARY
APPLICATIONS · Add-on accessory keyboards for personal digital assistants (PDAs) and hand-held PCs (H/PCs) · Built-in keyboards for PDAs and H/PCs PIN ASSIGNMENTS COL02 COL01 COL00 COL14 COL13 TxD COL12 ROW7
32 1 25 24
· · · ·
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 ©1999-2002 Semtech Corporation DOC5-703-600-DS-106
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OCSIN OSCOUT VSS COL07 COL08 COL09 COL10 COL11
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ORDERING CODE
Package Options 32-pin plastic LQFP Pitch 0.8 mm TA = -20°C to +85° UR5HC703-600-FG
Other Materials SerialCoder® 600 eval. kit
Type Evaluation kit
Order number EVK5-703-600
SERIALCODER® 600 FUNCTIONAL DIAGRAM
Data Buffer
Key Matrix Interface
ROW0-ROW7 16 COL00-COL15
8
TxD
Communication Interface
Matrix Scan Logic _RESET OSCIN _OSCOUT 4
Reset Logic Oscillator Power Supply
Copyright ©1999-2002 Semtech Corporation DOC5-703-600-DS-106
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www.semtech.com
PIN DEFINITIONS
Mnemonic Power Supply VDD, VDD2 Vss, Vss2 Reset _RESET Pin # 8, 5 11, 7 Type PWR PWR 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; 2 MHz operating frequency Oscillator output: Connect ceramic resonator with built-in load capacitors Serial data output: Idle at high voltage (logical 1), non-inverted data (direct connection to the UART)
6
I
Oscillator pins OSCIN
9
I
_OSCOUT Host interface TxD
10
O
27
O
Scanned matrix pins ROW0-ROW7
18-25
I, pup
Row matrix inputs: With pulsed pull-up current sources Column matrix output
COL00-COL15
30-32, 1-4, 12-16, 26, 28-29, 17
O
Copyright ©1999-2002 Semtech Corporation DOC5-703-600-DS-106
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www.semtech.com
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