PixiPoint

Z UR7HCPXZ-P440

Advanced "Click-to-Select"

No-Drift

PS/2 Force Stick Controller

PixiPoint and MouseCoder are trademarks of
Semtech Corp. All other trademarks belong to
their respective companies.

www.semtech.com

HID & SYSTEM MANAGEMENT PRODUCTS, MOUSECODER

FAMILY

DESCRIPTION

FEATURES

SELX
SELZ

DRVZ

VREF

_RESET

VSS2

VDD

_MB
_LB
INH
MDAT
MCLK
SSELECT
XCLK1
XCLK

OCSIN

_OSCOUT

VSS

V_XY0

V_XY1

Z_SIG0

Z_SIG1

XDA

_RB

SPWR0

SPWR1

SPWR2

SPWR3

SPWR4

OFST

· Notebooks/laptops
· Handhelds

· Keyboards
· Instrumentation

The PixiPoint

Z mouse encoder

is a cost-effective, high-
functionality IC designed to
interface the CTS 106, 108 and
109 sensors to the PS/2 port. Ideal
for laptop/palmtop use, the low
power PixiPoint

Z offers an

advanced algorithm for enhanced
motion control. The IC also
enables click, double-click,
MouseWheel action and slow drag
without the need for special
drivers. The IC provides an extra
port for hot-plug connection of an
external pointing device, including
those with built-in Mousewheel.
Both the embedded sensor and
the external device can be
operated concurrently.

The PixiPoint

Z utilizes a special

signal conditioning circuit (US and
International patent pending) which
enables a low cost, simple and real
estate-saving implementation. Just
a few low tolerance external
components are needed.

The IC implements typically
consumes less than 3mA, making it
suitable for use in battery-operated
systems.

PS/2 communication is
bidirectional at 10 kbps. The IC, a
CMOS device operating at 4 MHz,
is compatible with both the IBM
and Microsoft two-button and the
Logitech three-button mouse
protocols. It implements all
commands from and to the system,
as defined in the IBM PS/2 Mouse
Communication Protocol. Custom
versions are also available to suit a
range of applications.

· Can utilize standard mouse drivers
· Inexpensive, simple and real

estate-saving implementation with
USAR's proprietary signal
conditioning circuit

· Offers "Clean Stop" so cursor

stops when you want it to

· Compatible with IBM/Microsoft

two-button and Logitech three-
button mouse

· Supports all commands from and

to the system, as defined in the
IBM PS/2 Mouse Communication
Protocol

· Small 32-pin 7mm X 7mm LQFP

package

· Customized versions available
· Royalty-free and cost-effective

· Accurate cursor control via

Semtech's Advanced Motion
Control algorithm

· Click (Select), Double-Click

(Execute), MouseWheel and slow
drag are implemented in the IC
no special driver support required

· Enables hot-plug connections of

an external pointing device,
including those with MouseWheel

· Offers concurrent operation of

force stick and external pointing
device

· Provides ideal interface for CTS

Series 106, 108 and 109 sensors

· Low power consumption of

typically less than 3mA makes it
ideal for battery-operated systems

· 3-5V operation in extended

temperature range

APPLICATIONS

PIN ASSIGNMENTS

FUNCTIONAL DESCRIPTION

PIN DEFINITIONS

www.semtech.com

Mnemonic

Pin #

Type

Name and Function

VDD

Power Supply: +5V

VSS

Ground

VSS2

Ground

OSCIN

Oscillator Input: external clock input or one
side of the Ceramic Resonator with built-in Load
Capacitors

_OSCOUT

Oscillator Output: open for external clock
input or other side of the Ceramic Resonator with
built-in Load Capacitors

_RESET

Reset: apply 0V to provide orderly start-up

MDAT

I/O (nd)

Mouse Data: connects to host's data line

MCLK

I/O (nd)

Mouse Clock: connects to host's clock line

XCLK

External Mouse Clock: PS/2 clock signal from
external mouse

XCLK1

I/O (nd)

External Mouse Clock 1: connect to XCLK

XDAT

I/O (nd)

External Mouse Data: PS/2 data signal from
external mouse

_LB

I/O (nd)

Left Button: active low, strobed sampling

_MB

I/O (nd)

Middle Button: active low, strobed sampling

_RB

I/O (nd)

Right Button: active low, strobed sampling

DRV_XY0

I/O

Sensor's Excitation Driver

DRV_XY1

I/O

Sensor's Excitation Driver: connect to DRV_XY0

Z_SIG0

I/O

Sensor's Excitation Driver

Z_SIG1

I/O

Sensor's Excitation Driver: connect to Z_SIG0

DRVZ

I/O

Sensor's Excitation Driver

SELX

Select X: control line for analog multiplexer

SELZ

Select Z: control line for analog multiplexer

INH

Multiplexer Inhibit Signal: active high

VREF

Reference Voltage for built-in A/D

Analog to Digital Converter Input

I/O

Digital to Analog Converter Output

OFST

I/O

Offset: resets the offset circuit during inactivity

SPWR0

I/O

Switched Power Driver

SPWR1

I/O

Switched Power Driver: connect to SPWR0

SPWR2

I/O

Switched Power Driver: connect to SPWR0

SPWR3

I/O

Switched Power Driver: connect to SPWR0

SPWR4

I/O

Switched Power Driver: connect to SPWR0

PWROFF

I/O

Reserved: power management control

Note: An underscore before a pin mnemonic denotes an active low signal.
Pin Types Legend: AI=Analog Input; I=Input; O=Output; I/O=Input or Output;
I/O (nd)=Input or Output with N-chanel Open Drain driver

The UR7HCPXZ-P440 consists
functionally of five major sections
(see Functional Diagram, previous
page). These are the PixiPoint

Interface, the 16-Bit Timer, the
Oscillator Circuit, the PS/2
Communication Port and the 8042
Emulation Port. All sections
communicate with each other and
operate concurrently.

Semtech's proprietary circuit can correct a significant imbalance between
the gages in each X and Y pair (+/- 25%), allowing relaxed manufacturing
tolerances for the sensors, interconnecting cabling, and temperature-shift
induced errors (no performance degradation over the full operating
temperature range and for large temperature gradients between the
paired gages).

SIGNAL CONDITIONING CIRCUIT

SIGNAL CONDITIONING CIRCUIT (CON'T)

The PixiPoint

Z sensor is a flexible

(but very firm) "beam" with four
Strain Gages one on each of the
sides. If the force is applied
precisely in the X direction, then it
will produce a change of resistance
of only the two X gages. Force in
the Y direction will cause changes
only in the Y gages. One of the
pair of the gages will increase,
while the other will concurrently
decrease the resistance.

If the user presses on the sensor
from the top (Z Axis), all of the
strain gages will decrease the
resistance.

When the test current is passed
through the gages, these resistance
changes are converted into the
voltage changes. These signals are
very small, typically under 1 mV Full
Scale.

The Signal Conditioning Circuit
(patent pending) balances and
amplifies the incoming signals for
digitizing by a built-in A/D
converter.

BUILT-IN FEATURES

PS/2 COMMUNICATION

www.semtech.com

At start-up or upon receiving a reset command, the PixiPoint

Z will wait

between 300 and 500 milliseconds before sending an AAh to the host
followed by a device ID of 00h. Then the IC will set itself to its default
values, i.e. Incremental Stream Mode with 1:1 scaling, and a report rate
of 100 Hz. The device will then disable itself until a command is sent from
the host. PixiPoint

Z has responded or until 25 milliseconds have

elapsed.

The PixiPoint

Z enables click,

double-click, MouseWheel action
and slow drag without the need for
special drivers. A standard PS/2
mouse driver can be utilized.

EXTERNAL PS/2 PORT

ERROR HANDLING

The UR7HCPXZ-P440 offers an external PS/2 mouse port. Data from this
port is seamlessly merged with data from the internal pointing device.
External devices, including those utilizing a MouseWheel, can be hot-plug
connected.

For every correct command or parameter received from the host, the
UR7HCPXZ-P440 sends an Acknowledge (FAh). If an invalid command or
parameter is received, the UR7HCPXZ-P440 issues a Resend Request
(FEh). If an invalid input is again received, the device transmits an Error
Code (FCh) to the host. Both error and Resend request responses are sent
by the device within 25 milliseconds. The host may not issue any new
commands until either the PixiPoint

Z has responded or until 25

milliseconds have elapsed.

PS/2 DATA FORMAT

DATA REPORT FORMAT TABLE

www.semtech.com

Byte 1

Left Button status

1 = depressed

Right Button Status

1 = depressed

Middle Button Status

1 = depressed

Reserved

Always = 1

X8: MSB of X data, sign bit

1 = negative

Y8: MSB of Y data, sign bit

1 = negative

X data overflow

1 = overflow

Y data overflow

1 = overflow

Byte 2

X0: LSB of X data

Byte 3

Y0: LSB of Y data

Byte 4 (for wheel function; sent only if output of Z data is enabled by the driver)

Z0: LSB of Z data

Z7: MSB or Z data, sign bit

Byte 1

Right Button

1 = depressed

Middle Button

1 = depressed

Left Button

1 = depressed

Reserved

Always = 0

Scaling - 1:1 (0) / 2:1 (1)

Disable - (0) / enable (1)

Stream - (0) / prompt (1) mode

Always = 0

Byte 2

b0 - 1

Current resolution setting

b2 - 7

Always = 0

Byte 3

b0-7

Current sampling rate

The following table shows the
data report format. Each of the two
position values (X and Y) is
expressed as a 9-bit Two's
Complement integer with the most
significant bit (the sign bit) stored
separately in Byte 1. Z value
(wheel or scroll) is expressed as an
8-bit Two's complement integer.

If there is an overflow of the
accumulator, the maximum positive
or negative count is reported
and the corresponding overflow
bit is set.

STATUS REPORT FORMAT TABLE

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: UR7HCPXZ-P440

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: UR7HCPXZ-P440