SPICoder

UR5HCSPI

Zero-Power

Keyboard Encoder &

Power Management IC for H/PCs

SPICoder is a trademark of Semtech Corp. All
other trademarks belong to their respective
companies.

www.semtech.com

HID & SYSTEM MANAGEMENT PRODUCTS, H/PC IC FAMILY

DESCRIPTION

FEATURES

· StrongARM

Handheld PCs

· Windows CE

Platforms

· Web Phones

· Personal Digital Assistants (PDAs)
· Wearable Computers
· Internet Appliance

The SPICoder

UR5HCSPI

keyboard encoder and power
management IC is designed
specifically for handheld PCs
(H/PCs). The off-the-shelf
UR5HCSPI will readily work with
CPUs designed for Windows CE

saving OEMs significant
development time and money as
well as minimizing time-to-market for
the new generations of handheld
products.

Three main design features of the
UR5HCSPI make it the ideal
companion for the new generation
of Windows CE

-compatible,

single-chip computers: low-power
consumption; real estate-saving
size; and special keyboard modes.

"Quasi" Zero-Power

consumption

(less than 2µA @ 3V), a must for
H/PCs, provides the host system
with both power management and
I/O flexibility, with almost no battery
drainage.

Finally, special keyboard modes
and built-in power management
features allow the SPICoder

operate in harmony with the power
management modes of Windows
CE

, resulting in more user flexibility

and longer battery life.

The UR5HCSPI also offers
programmable features for wake-up
keys and general purpose I/O pins.

· Compatible with "system-on silicon"

CPUs for H/PCs

· Special keyboard and power

management modes for H/PCs,
including programmable "wake-up"
keys

· Scans, debounces, and encodes

an 8 x 12 matrix and controls
discrete switches and LED
indicators

· Custom versions available

· SPI-compatible keyboard encoder

and power management IC with
other interfaces available

· Compatible with Windows CE

keyboard specification

· Zero-Power

-- typically

consuming less than 2µA,
between 3-5V

· Offers overall system power

management capabilities

_PWR_OK

NC0

OSCO

OSCI

Vcc

NC
NC

_RESET

_WKU

_ATN

_SS

SCK

MOSI

MISO

XSW

SW0

C10/WUKO

C11/_LID

NC
LED2
LED1
LED0
_IOTEST
Vss
NC
R7
R6
R5
R4

QFP

UR5HCSPI-FB

_WKU

_RESET

Vcc

OSCI

OSCO

NC0

_PWR_OK

_ATN

_SS

SCK

MOSI

MISO

XSW

SW0

C10/WUKO

Vss

_IOTEST

LED0/GIO0

LED1/C13

LED2/C12

C11/_LID

UR5HCSPI-FN

PLCC

APPLICATIONS

PIN ASSIGNMENTS

Package Options

Pitch in mm's

TA=-20° C to +85° C

44-pin, Plastic PLCC

1.27 mm

UR5HCSPI-XX-FN

44-pin, Plastic QFP

0.8 mm

UR5HCSPI-XX-FB

Other Materials

Type

Order number

SPICoder

Testing Board

ASY5-SPI-XXX

Note 1: XX=Optional Customization, XXX= Denotes Revision number

BLOCK DIAGRAM

ORDERING CODE

www.semtech.com

Keyboard

Scanner

Keyboard

State

Control

R0-R8

SPI

Communication

Channel

C0-C11

Keyboard
Matrix

LID Latch Monitor

Wake-Up Keys Only Signal

Switch External to Case

Switch

System

Monitor

Input

Signals

Power

Management

Unit

LEDs

LID

WUKO

XSW

SWO

PWR_OK

WKUP

IOTEST

WKU

MISO

MOSI

SCK

ATN

UR5HCSPI

LED0

LED1

LED2

FUNCTIONAL DESCRIPTION

PIN DEFINITIONS

www.semtech.com

The UR5HCSPI consists
functionally of five major sections
(see the Functional Diagram on
page 2). These are the Keyboard
Scanner and State control, the
Programmable I/O, the SPI
Communication Channel, the
System Monitor and the Power
Management unit. All sections
communicate with each other and
operate concurrently.

Mnemonic PLCC QFP

Type Name and Function

VCC

Power Supply: 3-5V

VSS

Ground

Tie to VCC

OSCI

Oscillator input

OSCO

Oscillator output

_RESET

Reset: apply 0V to provide orderly
start-up

MISO

SPI Interface Signals

MOSI

SCK

_SS

Slave Select: If not used tie to VSS

_IOTEST

Wake-Up Control Signals

_WKU

R0-R4

13-17

8-12

Row Data Inputs

R5-R7

19-21

13-15

Port provides internal pull-up resistors

C0-C5

12-7

7-2

Column Select Outputs:

C6-C7

6-5

1,44

C8-C9

31-30

26-25

Multi-function pins

C10/WUKO

I/O C10 & "Wake-Up Keys Only" imput

C11/_LID

I/O C11 & Lid latch detect input

Miscellaneous functions

LED2

I/O LED2 output

LED1

I/O LED1 output

LED0

I/O LED0 output

XSW

External discrete switch

SWO

Discrete switch
Power Management Pins

_ATN

CPU Attention Output

_PWR_OK

Power OK Input

3,18

39-40

No Connects: these pins are unused

23,40

16,22

NC0

NC0 should be tied to VSS or GND

Note 1: An underscore before a pin mnemonic denotes an active low signal.

PIN DESCRIPTIONS

www.semtech.com

VCC and VSS

VCC and VSS are the power
supply and ground pins. The
UR5HCSPI will operate from a 3-5
Volt power supply. To prevent noise
problems, provide bypass
capacitors and place them as
close as possible to the IC with the
power supply. VX, where available,
should be tied to Vcc.

OSCI and OSCO

OSCI and OSCO provide the input
and output connections for the on-
chip oscillator. The oscillator can
be driven by any of the following
circuits:
- Crystal
- Ceramic Resonator
- External Clock Signal
The frequency of the on-chip
oscillator is 2 MHz.

_RESET

A logic zero on the _RESET pin will
force the UR5HCSPI into a known
start-up state. The reset signal can
be supplied by any of the following
circuits:
- RC
- Voltage monitor
- Master system reset

MOSI, MISO, SCK, _SS, _ATN

These five signals implement the
SPI interface. The device acts as a
slave on the SPI bus. The _SS
(Slave Select) pin should be tied to
ground if not used by the SPI
master. The _ATN pin is asserted
low each time the UR5HCSPI has a
packet ready for delivery. For a
more detailed description, refer to
the SPI Communication Channel
section on page 9.

_IOTEST and _WKU

"Input Output Test" and "Wake Up"
pins control the stop mode exit of
the device. The designer can
connect any number of active low
signals to these two pins through a
17K resistor, in order to force the
device to exit the stop mode. A
sample circuit is shown on page 15
of this document.

All the signals are "wire-anded."
When any one of these signals is
not active, it should be floating (i.e.,
these signals should be driven from
"open-collector" or "open-drain"
outputs). Other configurations are
possible; contact Semtech.

R0-R 7

The R0-R7 pins are connected to
the rows of the scanned matrix.
Each pin provides an internal pull-
up resistor, eliminating the need for
external components.

C0-C9

C0 to C9 are bi-directional pins
connected to the columns of the
scanned matrix. When a column is
selected, the pin outputs an active
low signal. When the column is de-
selected, the pin turns into high-
impedance.

C10/WUKO

The C10/WUKO pin acts
alternatively as column scan output
and as an input. As an input, the
pin detects the "Wake-Up Keys
Only" signal, typically provided by
the host CPU to indicate that the
user has turned the unit off. When
the device detects an active high
state on this pin, it feeds this
information into the "Keyboard State
Control" unit, in order to disable the
keyboard and enable the
programmed wake-up keys.

C11/_LID

The C11/_LID pin acts in a similar
manner to the C10/WUKO. This pin
is typically connected to the LID
latch through a 150K resistor, in
order to detect physical closing of
the device cover. When the pin
detects an active low state in this
input, it feeds this information into
the "Keyboard State Control" unit, in
order to disable keys inside the
case and enable only switches
located physically on the outer
body of the H/PC unit.

LED0, LED1 and LED2

These three pins provide an active
low drive for LED indicators. The
programming of these pins is
explained in the LEDs section on
page 8 of this document.

PIN DESCRIPTIONS, (CON'T)

THE WINDOWS CE

KEYBOARD

www.semtech.com

XSW

The XSW pin is dedicated to an
external switch. This pin is
handled differently than the rest of
the switch matrix and is intended
to be connected to a switch
physically located on the outside of
the unit.

SW0

The SW0 pin is a dedicated input
pin for a switch.

PWR_OK

The PWR_OK is an active low pin
that monitors the battery status of
the unit. When the UR5HCSPI
detects a transition from high to
low on this pin, it will immediately
enter the STOP mode, turn the LED
off and remain in this state until the
batteries of the unit are replaced
and the signal is deasserted.

The following illustration shows a typical implementation of a Windows CE®
keyboard.

Windows CE® does not support the following keyboard keys typically
found on desktop and laptop keyboards:

INSERT
SCROLL LOCK
PAUSE
NUM LOCK
Function Keys (F1-F12)
PRINT SCREEN

If the keyboard implements the Windows key, the following key
combinations are supported in the Windows CE

environment:

Key Combination

Result

Windows

Open Start Menu

Windows+K

Open Keyboard Tool

Windows+I

Open Stylus Tool

Windows+C

Open Control Panel

Windows+E

Explore the H/PC

Windows+R

Display the Run Dialog Box

Windows+H

Open Windows CE® Help

Ctrl+Windows+A

Select all on desktop

1 !

esc

3 #

2 @

5 %

4 $

7 &

6 ^

9 (

8 *

0 )

tab

shift

ctrl

shift

enter

= +

\ |

' "

; :

. >

, <

/ ?

] }

[ {

power

alt

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