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Details, datasheet, quote on part number:UR5HC703-700
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| Part: | UR5HC703-700 |
| Category: | Interface and Interconnect => KeyCoders |
| Description: | SerialCoder® 700 - Very Low-power Serial-interface Keyboard Encoder For Hand-held Devices |
| Company: | Semtech Corporation |
| Datasheet: | Download UR5HC703-700 datasheet File size : 81 kB |
| Request For quote: | Find where to buy UR5HC703-700
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Datasheet text preview:
SerialCoderTM 700 UR5HC703-700 Extremely Low-Power Keyboard Encoder Interfaces RS-232
HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODERTM FAMILY DESCRIPTION The SerialCoderTM 700 UR5HC703-700 is an extremely lowpower, "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 SerialCoderTM 700 provides Self-Power ManagementTM and draws its power entirely from the host device. It is ideal for use in add-on keyboards for handheld and cellular / web phones and other portable applications. Self-Power ManagementTM is 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 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 SerialCoderTM 700 is simple to implement. It requires few external components and utilizes a tiny, lowprofile 32-pin LQFP package that measures 7mm x 7mm. FEATURES · 8 x 14 keyboard matrix encoding · IC is independent of the keyboard layout · Extremely low-power operation, transparent to the host · Typical current consumption of less than 1 µA at room temperature; 10 µA at 85°C APPLICATIONS · Built-in keyboards for personal digital assistant (PDA) and handheld PC (H/PC) devices · Add-on accessory keyboards for PDA and H/PC devices PIN ASSIGNMENTS · · · · Portable personal computers Instrumentation Remote control Cellular phones · 9600 Baud 8N1 serial data format · Direct connection to RS-232 signals from the host UART · Simple, proprietary serial protocol · Robust algorithm for ghost-key elimination · Self-Power ManagementTM, sleeps between keystrokes PRELIMINARY
ROW7 COL12 TxD COL13 HS COL0 COL1 COL2
32 1 25 24
COL3 COL4 COL5 COL6 VDD2 RESET VSS2 VDD
8 9
UR5HC703-700-FG LQFP
ROW6 ROW5 ROW4 ROW3 ROW2 ROW1 ROW0 RxD
17 16
SerialCoder, KeyCoder, and Self-Power Management are trademarks of Semtech Corporation. All other trademarks belong to their respective companies. Copyright ©1999-2001 Semtech Corporation DOC5-703-700-DS-105
1
OCSIN OSCOUT VSS COL7 COL8 COL9 COL10 COL11
www.semtech.com
ORDERING CODE
Package Options 32-pin, Plastic LQFP Pitch 0.8 mm Ta = -20° C to +85° C UR5HC703-700-FG
Other Materials SerialCoderTM 700 eval. kit
Type Evaluation kit
Order number EVK5-703-700
SERIALCODERTM 700 FUNCTIONAL DIAGRAM
UR5HC703-700
Data Buffer Key Matrix Interface 8 R0-R7 14 C0-C13
HS TxD RxD Communication Interface Matrix Scan Logic _RESET OSCIN _OSCOUT 4
Reset Logic Oscillator Power Supply
Copyright ©1999-2001 Semtech Corporation DOC5-703-700-DS-105
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www.semtech.com
PROTOCOL The SerialCoderTM 700 uses a proprietary serial protocol (patent pending) for two-way communication with the host device. The specification for this protocol is available, subject to a non-disclosure agreement (NDA), to customers and driver developers. This protocol allows the host device to save significant power, by indicating to the host device when it can lower its power consumption to a minimum. This flexible protocol can also accommodate additional types of data if desired; for example, position data from a pointing stick embedded in the keyboard.
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 whenever VDD is below 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 0V, non-inverted data (direct connection to RS232 port) Serial data input "Hot" synchronization signal
6
I
Oscillator pins OSCIN
9
I
_OSCOUT
10
O
Host Interface TxD
27
O
RxD HS Scanned matrix pins ROW0-ROW7
17 29
I O
18-25
I
Row matrix inputs with pulsed pull-up current sources Column matrix output, open drain
COL0-COL13
30-32, 1-4, 12-16, 26, 28
O
Note: An underscore before a pin mnemonic denotes an active low signal.
Copyright ©1999-2001 Semtech Corporation DOC5-703-700-DS-105
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www.semtech.com
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