SPICoder® SA01 UR5HCSPI-SA01

Very Low-Power Keyboard Encoder and

Power Management IC for H/PCs

Semtech, SPICoder, and KeyCoder are registered
trademarks of Semtech Corporation. Self-Power
Management is a trademark of Semtech
Corporation. All other trademarks belong to their
respective companies.

www.semtech.com

HID & SYSTEM MANAGEMENT PRODUCTS, KEYCODER® FAMILY

DESCRIPTION

FEATURES

· StrongARMTM handheld PCs
· Windows® CE platforms
· Web phones

· Personal digital assistants (PDAs)
· Wearable computers
· Internet appliances

The SPICoder® SA01
UR5HCSPI-SA01, a member of
Semtech's KeyCoder® product
family, is a keyboard encoder and
power management IC designed
specifically for handheld PCs
(H/PCs), web phones and other
systems that run Microsoft®
Windows® CE and utilize the Intel
StrongARMTM processor.

The SPICoder® SA01 offers
several features necessary to
H/PCs, including extremely low
power consumption, real estate-
saving size, and special keyboard
modes.

The IC consumes an extremely
small amount of power (less than
2 µA at 3 V) and provides the host
system both power management
and I/O flexibility, with minimal
battery drainage.

Special keyboard modes and built-
in power management features
allow the SPICoder® SA01 to
operate in harmony with the power
management modes of
Windows® CE, resulting in greater
user flexibility, and longer battery
life.

The IC scans, debounces and
encodes an 8 x 14 keyboard
matrix. It communicates with the
host over the SPI channel,
implementing a high-reliability two-
way protocol. The SPICoder®
SA01 also offers programmable
features for wake-up keys and
general purpose I/O pins.

· Fully compatible with the

Windows® CE keyboard
specification

· Works in harmony with the power

management modes of
Windows® CE

· Provides special modes of

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

· Scans an 8 x 14 matrix; controls

discrete switches and LED
indicators

· Compatible with "system-on

silicon" CPUs for H/PCs

· SPI-compatible keyboard encoder

and power management IC

· Ideal for use with the Intel

StrongARMTM processor

· Patented technology for extremely

low power consumption --
typically less than 2 µA between
3-5 V

· Offers overall system power

management capabilities

· Available in low-profile QFP

package

· Implements high-reliability two-

way protocol

PWR_OK

NC0

OSCO

OSCI

Vcc

NC
NC

_RESET

_WKU

_ATN

_SS

SCK

MOSI

MISO

XSW

SW0

C10/WUKO

C11

NC
C12
C13
GIO0
_IOTEST
Vss
NC
R7
R6
R5
R4

QFP

UR5HCSPI-SA01-FB

44-pin QFP

(0.80 mm pitch

(10x10 mm)

APPLICATIONS

PIN ASSIGNMENTS

PRELIMINARY

FUNCTIONAL DESCRIPTION

PIN DEFINITIONS

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The SPICoder® SA01 consists
functionally of five major sections
(see the block diagram). 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

QFP

Type Name and Function

VCC

Power supply: 3-5V

VSS

Ground

Tie VX 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

8-12

Row data inputs

R5-R7

13-15

Port provides internal pull-up resistors

C0-C5

7-2

Column select outputs

C6-C7

1,44

C8-C9

26-25

C11

C12

C13

Multi-function pin

C10/WUKO

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

Miscellaneous functions

GI00

I/O General programmable I/O

XSW

External discrete switch

SWO

Discrete switch

Power management pins

_ATN

CPU attention output

PWR_OK

Power OK input

16, 22

No Connects: these pins are unused

39, 40

NC0

NC0 should be tied to VSS or GND

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

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PIN DESCRIPTIONS

VCC and VSS

VCC and VSS are the power supply
and ground pins. The
SPICoder® SA01 operates from a
3-5 Volt power supply. To prevent
noise problems, provide bypass
capacitors placed 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 2.00 MHz.

_RESET

A logic zero on the _RESET pin
forces the SPICoder® SA01 into a
known start-up state. The reset
signal can be supplied by any of
the following circuits:

- Resistor/capacitor
- 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 must go high
between successive characters in
an SPI message or a write collision
error results. The _ATN pin is
asserted low each time the
SPICoder® SA01 has a packet
ready for delivery. For a more
detailed description, refer to the
SPI Communication Channel
section of this document.

_IOTEST and _WKU

The_IOTEST and _WKU pins ("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 15 K

resistor, in order to force the device
to exit the stop mode. A sample
circuit is included in 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).

R0 - R7

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 to C9 and C11

Pins C0 to C9 are bi-directional
pins and are 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.

To achieve maximum power
savings, the resistor connected to
WUKO can be as large as 1.5 M

PIN DESCRIPTIONS (CONT'D)

THE WINDOWS® CE KEYBOARD

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C12 and C13

C12 and C13 are used as
additional column pins in order to
accommodate larger-size
keyboards, such as the Fujitsu
FKB1406 palmtop keyboard.

GIO0

GIO0 is a programmable
input/output switch or LED pin; it
can also be used as a wake-up
signal. Its programming is
explained in the General Purpose
I/O Pin section of this document.

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
SPICoder® SA01 detects a
transition from high to low on this
pin, it immediately enters the STOP
mode, turns the LED off, and
remains 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

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