UR5HC703-700-FG datasheet, PDF

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UR5HC703-700-FG: DescriptionMicroprocessor Circuit, CMOS, PQFP32, 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32; CategoryThe embedded processor and controller Microcontrollers and processors; File Size77KB，10 Pages; ManufacturerSEMTECH; Websitehttp://www.semtech.com

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UR5HC703-700-FG Overview

Microprocessor Circuit, CMOS, PQFP32, 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32

UR5HC703-700-FG Parametric

Parameter Name	Attribute value
Is it lead-free?	Contains lead
Is it Rohs certified?	incompatible
Maker	SEMTECH
Parts packaging code	QFP
package instruction	LQFP,
Contacts	32
Reach Compliance Code	unknown
JESD-30 code	S-PQFP-G32
JESD-609 code	e0
length	7 mm
Number of terminals	32
Maximum operating temperature	85 °C
Minimum operating temperature	-20 °C
Package body material	PLASTIC/EPOXY
encapsulated code	LQFP
Package shape	SQUARE
Package form	FLATPACK, LOW PROFILE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Certification status	Not Qualified
Maximum seat height	1.7 mm
Maximum supply voltage	5.5 V
Minimum supply voltage	2.2 V
surface mount	YES
technology	CMOS
Temperature level	OTHER
Terminal surface	TIN LEAD
Terminal form	GULL WING
Terminal pitch	0.8 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	NOT SPECIFIED
width	7 mm
uPs/uCs/peripheral integrated circuit type	MICROPROCESSOR CIRCUIT

UR5HC703-700-FG Preview

SerialCoder™ 700 UR5HC703-700

Extremely Low-Power Keyboard

Encoder Interfaces RS-232

HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODER™ FAMILY

DESCRIPTION

The SerialCoder™ 700

UR5HC703-700 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 SerialCoder™ 700 provides

Self-Power Management™ 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 Management™ 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 SerialCoder™ 700 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

• 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 hand-

held 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 Management™, sleeps

between keystrokes

PRELIMINARY

ROW7

COL12

TxD

COL13

COL0

COL1

COL2

COL3

COL4

COL5

COL6

VDD2

RESET

VSS2

VDD

UR5HC703-700-FG

LQFP

ROW6

ROW5

ROW4

ROW3

ROW2

ROW1

ROW0

RxD

SerialCoder, KeyCoder, and Self-Power

Management are trademarks of Semtech

Corporation. All other trademarks belong to their

respective companies.

DOC5-703-700-DS-105

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

SerialCoder™ 700 eval. kit

Type

Evaluation kit

Order number

EVK5-703-700

SERIALCODER™ 700 FUNCTIONAL DIAGRAM

UR5HC703-700

Data

Buffer

Key

Matrix

Interface

R0-R7

14 C0-C13

TxD

RxD

Communication

Interface

Matrix

Scan Logic

_RESET

OSCIN

_OSCOUT

Reset Logic

Oscillator

Power Supply

DOC5-703-700-DS-105

www.semtech.com

PROTOCOL

The SerialCoder™ 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

, V

Reset

_RESET

Pin #

8, 5

11, 7

Type

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 V

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

Oscillator pins

OSCIN

_OSCOUT

Host Interface

TxD

RxD

Scanned

matrix pins

ROW0-ROW7

18-25

Row matrix inputs

with pulsed

pull-up current sources

Column matrix output,

open drain

COL0-COL13

30-32,

1-4,

12-16,

26, 28

Note:

An underscore before a pin mnemonic denotes an active low signal.

DOC5-703-700-DS-105

www.semtech.com

“GHOST” KEYS

In any scanned contact switch

matrix, whenever three keys

defining a rectangle on the switch

matrix are pressed at the same

time, a fourth key positioned on the

fourth corner of the rectangle is

sensed as being pressed. This is

known as the “ghost” or “phantom”

key problem.

KEYBOARD SCANNER

The encoder scans a keyboard organized as an 8 row by 14 column matrix

for a maximum of 112 keys. Smaller size matrixes can also be

accommodated by simply leaving unused pins open. The SerialCoder™

provides internal pull-ups for the row input pins. When active, the encoder

selects one of the column lines (C0-C13) every 512 µS and then reads the

row data lines (R0-R7). A key closure is detected as a zero in the

corresponding position of the matrix.

A complete scan cycle for the entire keyboard takes approximately 9.2 ms.

Each key found pressed is debounced for a period of 20 ms. Once the

key is verified, the corresponding key code(s) are loaded into the transmit

buffer of the serial communication channel.

N-KEY ROLLOVER

N-key rollover means the code(s) corresponding to each key press are

transmitted to the host system as soon as that key is debounced, indepen-

dent of the release of other keys.

“Ghost”

Key

Actual key presses

Figure 1:

“Ghost” or “Phantom” Key

Problem

When a key is released, the corresponding break code is transmitted to the

host system. Several keys can be held pressed at the same time.

However, if two or more key closures occur within a time interval of less

than 5 ms, an error flag is set, and those closures are not processed. This

feature protects against the effects of accidental key presses.

POWER MANAGEMENT

Although the problem cannot be

totally eliminated without using

external hardware, there are

methods to neutralize its negative

effects for most practical

applications. Keys that are

intended to be used in

combinations should be placed in

the same row or column of the

matrix, whenever possible. Shift

keys (Shift, Alt, Ctrl, Window)

should not reside in the same row

(or column) as any other keys. The

SerialCoder™ has built-in

mechanisms to detect the

presence of “ghost” keys.

The SerialCoder™ 700 achieves uniquely low system power consumption,

due partly to Self-Power Management™, and partly to the proprietary

protocol the IC uses to communicate with the the host system driver. Self-

Power Management™ powers down the IC between key presses; a key

press wakes up the IC immediately without losing any key data. The

protocol allows the host system to power down the power-wasting charge

pumps (for the communications interface) after a short period of inactivity.

Alerting the host on connection

When a keyboard assembly (including the SerialCoder™ 700 and the

recommended components) is plugged into a host system, the

SerialCoder™ 700 sends an identification code to the host, and forces the

host into a state where the host can acknowledge the code. After the host

receives and acknowledges this code, the host is aware that the keyboard

assembly is connected, and the host can then choose what to do next.

For example,

(1) The host can choose to enter a fully awakened state, and turn on the

screen, etc.

(2) If no keys have been pressed, the host can choose to return to a sleep

state.

DOC5-703-700-DS-105

www.semtech.com

EVALUATION BOARD NOTE

Note: Jumper Setting

When using the SerialCoder™ 700 evaluation board, and powering the IC

from the PDA interface, jumper 3 (J3) must be open; when powering from

the RS232 port, jumper 3 must be closed.

DOC5-703-700-DS-105

www.semtech.com

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