HulaCoderTM UR7HCDMP

HulaPointTM Ergonomic Mouse

PS/2 and RS232 Encoder

Semtech and MouseCoder are registered
trademarks of Semtech Corporation. HulaCoder
and Hulapoint are trademarks of Semtech
Corporation. All other trademarks belong to their
respective companies.

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HID & SYSTEM MANAGEMENT PRODUCTS, MOUSECODER® FAMILY

DESCRIPTION

FEATURES

· Embedded HulaPointsTM
· Industrial panels

· Industrial keyboards
· Instrumentation

· Works with innovative, proprietary

sensor technology developed by
Fujitsu Microelectronics

· Responds to feather-light touch

without resistance

· Available in a small 18-pin plastic

SOIC package

· Autoselects RS232 or PS/2

hardware interface

· Equipped with advanced motion-

control algorithm

· Low power consumption in a

3-volt to 6-volt operating range

· Effortless and accurate cursor

control with 10-degree movement
in every direction

· Compatible with IBM/Microsoft

two-button mice and Logitech
three-button mice

The HulaCoderTM UR7HCDMP is an
easy-to-use single-chip encoder
that interfaces to an innovative
sensor developed by Fujitsu. The
IC and sensor together make the
HulaPointTM ergonomic mouse.
Equipped with an advanced motion
algorithm, the HulaCoderTM offers
low power consumption in a small-
footprint package. The device
connects to either a serial or a PS/2
mouse port on the host system.

The HulaCoderTM is compatible with
the communication protocols for
IBM and Microsoft two-button mice
and Logitech three-button mice.
The IC automatically detects the
port type (serial or PS/2) and uses
the appropriate protocol for that port
type.

Serial communication by the
HulaCoderTM is half-duplex at a
fixed speed of 1200 Baud. PS/2
communication is bidirectional at 10
Kbps. The HulaCoderTM
implements all commands to and
from the host system, as defined in
the IBM PS/2 mouse communication
protocol.

The HulaCoderTM is a CMOS device
operating at 4 MHz. The low power
consumption of the IC makes it
suitable for battery operated
systems. In serial mode, like any
standard serial mouse, the IC can
draw power from the RS232 lines of
the host system.

CHX

RTS

TxD

RESET

VSS (GND)

PS2CLK

PS2DAT

RIGHTSW

LEFTSW

CHY

PWRON

OSCIN

OSCOUT

VDD (+V)

DA2

DA1

DA0

MIDDLESW

UR7HCDMP-DW

SOIC

APPLICATIONS

PIN ASSIGNMENTS

PRELIMINARY

FUNCTIONAL DESCRIPTION

ORDERING CODE

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Package options

18-pin SOIC
18-pin SOIC

Sensor
orientation
Inverted
Normal

Pitch

1.270 mm
1.270 mm

TA =
-40°C TO +85°C
UR7HCDMP-A-DW
UR7HCDMP-B-DW

The HulaCoderTM consists functionally of five major sections (see Functional Diagram below). These are the Sensor
Interface, the Sixteen Bit Timer, the Oscillator Circuit, the PS/2 Communication Port and the RS232 Communication
Port. All sections communicate with each other and operate concurrently.

Data Buffer

PS/2

Communication

Port

RS232

Communication

Port

PS2CLK

PS2DAT

TXD

RTS

HulaPoint Interface

Oscillator Circuit

Power-On Reset

Switch Interface

X Input

Y Input

Control

CHX

OSCIN-OSCOUT

16 bit Timer

CHY

Sensor Power

Strobe

Resolution

Enhancement D/A

LEFT

BUTTON

MIDDLE

BUTTON

RIGHT

BUTTON

FUNCTIONAL DIAGRAM

Note: See the sensor orientation section for sensor orientation diagrams.

AUTODETECT

PIN DESCRIPTION

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At power-up the HulaCoderTM
automatically detects the host
interface type (PS/2 or serial), and
uses the correct protocol.

Pin Numbers
Mnemonic

Type

Name and Function

CHX

Analog Input

Horizontal input

RTS

I/O

Ready To Send (RTS) sense,
power save out

_TxD

O, Open Drain

Transmit s

erriia

all d

atta

_RESET

Reset: apply 0 V for orderly start
up.

GND

Power

Ground

PS2CLK

I/O

PS/2 clock

PS2DAT

I/O

PS/2 data

_RIGHTSW

I w/ Pullup

Right switch: low = on

_LEFTSW

I w/ Pullup

Left switch: low = on

_MIDDLESW

I w/ Pullup

Middle switch: low=on

DA0

Resolution enhancement
D/A 0:

l
le

stt s

siig

niiffiic

ntt b

biitt ((LSb)

DA1

Resolution enhancement
D/A 1

DA2

Resolution enhancement
D/A 2:

stt s

siig

niiffiic

ntt b

biitt ((MSb)

VCC

Power

Power supply

_OSCOUT

Oscillator output

OSCIN

ciilllla

atto

orr iin

utt

_PWRON

Sensor power strobing
control

CHY

Analog Input

Vertical input

The internal oscillator has a built-in feedback resistor. Only one external
component is needed for clock generation. Semtech recommends a 4.00
MHz ceramic resonator with built-in load capacitors.

RIGHTSW, LEFTSW, and MIDDLESW inputs have built-in pull-up resistors.
No additional components are required for a three-button design. However,
if high levels of ESD and EMI are expected, then series protection resistors
(47 Ohms to 1K Ohms) are recommended between the switches and the
switches' inputs on the IC.

PS/2 MODE

PIN DESCRIPTION NOTES

ERROR HANDLING

At start-up or upon receiving a reset
command, clock and data lines of
the HulaCoderTM can be pulled to a
positive level. The IC then waits
between 300 and 500 milliseconds
before sending an 0xAA to the host
followed by a device ID of 0x00.
Then the IC sets itself to its default
values, i.e. Incremental Stream
Mode with 1:1 scaling, and a report
rate of 100 Hz. The device then
disables itself until it receives a
command from the host.

For every correct command or
parameter received from the host,
the HulaCoderTM sends an
Acknowledge (0xFA). If an invalid
command or parameter is received,
the HulaCoderTM issues a Resend
Request (0xFE). If an invalid input
is again received, the device
transmits an Error Code (0xFC) 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
HulaCoderTM has responded or 25
milliseconds have elapsed.

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

PS/2 MODE COMMANDS

PS/2 DATA FORMAT

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When the Reset Command
(0xFF) is enacted, the HulaCoderTM
sets the following default
parameters: Incremental Stream
Mode, 1:1, scaling, disabled, and a
report rate of 100 Hz and then
sends 0xAA to the host followed by
a device ID of 0x00.

The host sends the Resend Last
Data Stream Command (0xFE)
when it detects an error in any
transmission from the HulaCoderTM.
The HulaCoderTM then resends the
last output data stream to the host.
This transmission occurs after a
HulaCoderTM transmission and
before the host enables the
interface allowing the next
HulaCoderTM output.

The Set Default Status
Command (0xF6) re-initializes the
device to its condition at power-up.

The Disable Command (0xF5)
stops the device from transmitting
all reports. However, the mode
does not change; and the
HulaCoderTM is still able to respond
to commands. If the Disable
Command is issued while the
device is transmitting a report, the
HulaCoderTM immediately stops the
transmission and disables itself.

If the HulaCoderTM is in Incremental
Stream Mode, the Enable
Command (0xF4) allows it to
begin data transmission. If the
device is in Prompt Mode, the
Enable Command updates the
internal status of the HulaCoderTM,
but does not allow the device to
transmit reports of motion or button
data to the host.

The following table shows the data report format. Values are expressed in
a two's complement format with a separate sign bit. If there is an overflow
of the accumulator, the maximum positive or negative count is reported and
the corresponding overflow bit is set.

Byte 1

Left Button status

1 = depressed

Right Button Status

1 = depressed

Middle Button Status

1 = depressed

Always = 1

X8: MSB (sign) of X data

1 = negative

Y8: MSB (sign) of Y data

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

Status Report Format Table

Byte 1

Right Button

1 = depressed

Middle Button

1 = depressed

Left Button

1 = depressed

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

PS/2 COMMANDS (CONT'D)

SEQUENTIAL COMMANDS

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When the HulaCoderTM receives the

et Sampling Rate Command

(0xF3), it responds in both stream
and prompt modes, but updates its
internal status only in stream mode.

The HulaCoderTM responds to the
the Read Device Type
Command (0xF2) immediately
after the Acknowledge with a 0x00.

The Set Prompt (Remote)
Mode Command (0xF0) sets the
device to prompt mode. Data
values are then reported only in
response to a Read Report
Command (0xEB).

The Set Echo Mode Command
(0xEE) is enables echo mode; with
this mode enabled, the
HulaCoderTM immediately returns
any data bytes except 0xFF or
0xEC.

The Reset Echo Mode
Command (0xEC) disables echo
mode. If this command occurs
while the HulaCoderTM is in either
stream or prompt Modes, the
command is ignored.

The Read Report Command
(0xEB) prompts the HulaCoderTM for
a report. The report occurs even if
the device has not moved and the
status of the switches has not
changed. The report is sent by the
HulaCoderTM following an
Acknowledge.

The Set Incremental Stream
Mode Command (0xEA) sets the
HulaCoderTM to stream mode and
disables the device.

A sequential command consists of a strictly specified, unbroken sequence
of individual commands.

The HulaCoderTM implements a special sequential command that can be
used to determine its ability to report three buttons. This sequential
command is a series of commands to the HulaCoderTM that cause the IC to
give a special response to the last command (Read Status).

Sequence of commands:

1. Set Resolution = one count/mm

Direct: 0xE8,0x00 BIOS: INT0x15, AX=0xC203, BX=0

2. Set Scaling = 1:1

Direct: 0xE6 BIOS: INT0x15, AX=0xC206, BX=1

3. Set Scaling = 1:1

Direct: 0xE6 BIOS: INT0x15, AX=0xC206, BX=1

4. Set Scaling = 1:1

Direct: 0xE6 BIOS: INT0x15, AX=0xC206, BX=1

5. Read Status

Direct: 0xE9 BIOS: INT0x15, AX=0xC206, BX=0

The response to the Read Status Command is in the form:

Byte 1: Standard Status Information (buttons, scaling, etc.)

Byte 2: Number of mouse buttons (3)

Byte 3: Firmware Revision Number (encoded)

The individual commands that comprise this sequential command have
been designed so that a sequential command can be sent to the
HulaCoderTM via the standard IBM PS/2 BIOS calls, and the IC only returns
a valid response to the Standard Status Request. This ensures that, if the
sequential command is sent via the BIOS, the status response is returned
accurately even if the BIOS does error detection. Thus, a programmer can
have complete control of the mouse without having to access the device
hardware port directly.

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