SH1211 MouseCoder® data sheet

SH1211 MouseCoder®

Ergonomic Mouse

PS/2 and RS232 Encoder

Semtech, the Semtech logo, MouseCoder, and
HulaPoint are marks of Semtech Corporation.
Force Sensing Resistor and FSR are marks of
Interlink Electronics, Inc. MicroPoint is a mark of
Varatouch Technology, Inc. All other marks belong
to their respective owners.

www.semtech.com

HID & SYSTEM MANAGEMENT PRODUCTS, MOUSECODER® FAMILY

DESCRIPTION

FEATURES

· Embedded HulaPointsTM
· Industrial panels
· Joystick applications

· Industrial keyboards
· Instrumentation
· Gaming

· Works with a Hall-effect sensor
· Works with a resistive analog

joystick sensor

· Works with a switch joystick sensor
· Works with an FSR sensor
· Works with a Varatouch

MicroPointTM sensor

· Available in a small 32-pin plastic

LQFP package

· Advanced motion-control algorithm

for accurate cursor control

· Low power consumption in a

3.3 to 5.5 volt operating range

· Compatible with standard two-

button, three-button, and wheel
mice

· RS232 or PS/2 host interface

The SH1211 MouseCoder® is an
easy-to-use single-chip multi-
mouse encoder with an advanced
motion algorithm for accurate
cursor control. The SH1211 offers
low power consumption in a small-
footprint package, and connects to
a host serial or a PS/2 mouse port.

The SH1211 is designed for use
with a Fujitsu Takamisawa
FID-828 Hall-effect sensor
(HulaPointTM), a resistive analog
joystick sensor (like the CTS 252),
a switch joystick sensor, an FSR
sensor, or a Varatouch
MicroPointTM sensor, as well as
others.

The SH1211 provides an external
port for hot-plug connection of a
PS/2 mouse, including one with
wheel function.

SH1211 serial communication is
unidirectional at a fixed speed of
1200 Baud. PS/2 communication
is bidirectional at 10 Kbps. The
SH1211 is a CMOS device
operating at 4 MHz. It can return
mouse reports at the rate of 100
per second. The SH1211 is
compatible with the standard two-
button mouse protocol, the
standard three-button mouse
protocol, and standard wheel
mouse protocols. It implements all
commands from and to the system,
as defined in the IBM PS/2 mouse
communication protocol.

The SH1211's low power
consumption makes it ideal for
battery operated systems.

SEN00
SEN01
SEN02
SEN03

VREF

_RESET

VSS2

VDD

SEN14
SEN13
SEN12
SENSEL2
SEN11
MDAT/RTS
SENSEL1
EMCLK

SEN15

INTSEL

TxD

SCLK

SEN04

SEN05

SEN06

SEN07

SEN10

SEN09

EMDA

MCLK

SEN08

VSS

_OSCOUT

OSCIN

SH1211-FG

LQFP

APPLICATIONS

PIN ASSIGNMENTS

PRELIMINARY

ORDERING CODE

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The SH1211 consists functionally of five major sections (see block diagram below). These are the Sensor Interface,
the 16-bit Timer, the Oscillator Circuit, the PS/2 Communication Port and the RS232 Communication Port. All
sections communicate with each other and operate concurrently.

BLOCK DIAGRAM

Data Buffer

Host PS/2

Communication

Port

External PS/2

Port

MCLK

MDAT

EMCLK

EMDAT

Sensor Interface

Oscillator Circuit

Power-on Reset

Switch Interface

X Input

Y Input

Control

OSCIN-OSCOUT

16-bit Timer

Sensor Power

Strobe

Analog Signal Input

Left, Middle/Up,

Right, & Down

Buttons

Host Serial

Communication

Port

TxD

RTS

RESET

FUNCTIONAL DESCRIPTION

SH1211-FG

LQFP 32-pin, 0.8 mm pitch, T

= -20°C to +85°C

EVK-SH1211

Evaluation kit

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SENSOR CONFIGURATIONS

MOUSE EMULATION

The SH1211 emulates either a
standard 3-button mouse or a
standard wheel mouse. The state
of the button configuration pin
(BCONF, pin 20) determines which
mouse type is emulated. The pin
left floating specifies 3-button
mode, the pin tied to ground
specifies wheel mode.

In 3-button mode, the left, right and
middle buttons are implemented.

In wheel mode, the left, right, up,
and down buttons are
implemented; pressing up and
down buttons together emulates a
middle-button press.

POWER CONSUMPTION

The SH1211 typically consumes
less than 3 mA in standby for
HulaPointTM or analog joystick
sensors and less than 1 µA for
other sensors.

EXTERNAL PS/2 PORT

The SH1211 provides an external
PS/2 mouse port. Data from this
port is seamlessly merged with
data from the embedded sensor.
External mice, including those with
a mouse wheel, can be hot-plug
connected.

The SH1211 has built-in support applicable to many sensors, including the
following:

HulaPointTM Fujitsu Takamisawa FID-828 Hall-effect sensor

Analog joystick sensor such as the CTS 252

Switch joystick sensor

FSRTM sensor (Force Sensing ResistorTM, Interlink Electronics)

Varatouch MicroPointTM sensor

The states of the sensor select pins 18 and 21 (SENSEL1, SENSEL2)
indicate which sensor is being used.

The name, definition and use of the 16 sensor pins (SEN00-SEN15: pins 1-
4, 29-32, 15, 16, 20, 22-25) vary depending on which sensor is being used.
Refer to the schematics and pin definitions in this data sheet for specifics.

HOST INTERFACE

The SH1211 communicates with
the host system using either PS/2
or serial. The state of the interface
select pin (INTSEL, pin 26)
determines which interface is used.
If the pin is tied to ground, PS/2 is
used; if it is tied to power (Vcc),
serial is used.

PINS FOR HULAPOINTTM & ANALOG JOYSTICK SENSOR CIRCUITS

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Pin Numbers

Mnemonic

Type

Name and Function

Power
V

Power supply: +5V

2, V

7, 11

Ground

Reset
_RESET

Reset: apply 0V for orderly start-up

Oscillator
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 one
side of the ceramic resonator with built-in load
capacitors

Host
INTSEL

Host interface select: tie to ground for PS/2 host, tie to
power (V

) for serial host

MCLK

I/O (nd) Host PS/2 clock

MDAT/RTS

I/O (nd) Host PS/2 data / serial ready-to-send

TxD

Serial transmit to host: idle high; in serial mode,
connect to host RxD; in PS/2 mode, leave floating

External PS/2
EMCLK

I/O (nd) External mouse clock: PS/2 clock signal from external

mouse

EMDAT

I/O (nd) External mouse data: PS/2 data signal from external

mouse

Select
SENSEL1-2

18, 21

Sensor select; for HulapointTMor analog joystick, leave
both floating

Reference
VREF

Reference voltage for built-in A/D: for HulaPoint sensor,
connect to SPWR0

Sensor
SEN00-3

1-4

I/O

Switched power drivers; connect together

/SWPWR0-3
SEN04-5

29, 30

I/O

Switched power driver; connect to SWPWR0

/SWPWR4-5
SEN06/YAD

Y-axis analog to digital converter input

SEN07/XAD

X-axis analog to digital converter input

SEN08/_XYSWP 12

Leave floating for default X, Y axes; connect to ground
to swap X and Y axes

SEN09/_XINV

Leave floating for default X direction; connect to ground
for reversed X direction

SEN10/_YINV

Leave floating for default Y direction; connect to ground
for reversed Y direction

SEN11/BCONF

Button configuration: leave floating for standard
3-button mouse mode, tie to ground for
up/down/wheel-mouse mode

SEN12/_DB

I/O (nd) Down button: active low, strobed sampling

SEN13/_LB

I/O (nd) Left button: active low, strobed sampling

SEN14/_MB/_UB 24

I/O (nd) Middle button: active low, strobed sampling

SEN15/_RB

I/O (nd) Right button: active low, strobed sampling

Reserved
RSVD

Leave floating

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

Pin types legend:

P = power
AI = analog input
I = input
O = output
I/O = input or output
I/O (nd) = input or output with

N-channel open drain driver

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 (AVX PBRC-4.00BR or
equivalent).

The button inputs (pins 22-25)
have built-in pull-up resistors. No
additional components are
required. 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 switch inputs on
the SH1211.

PIN DESCRIPTION NOTES

HULAPOINTTM & ANALOG

These pin descriptions and the
schematic on the next page apply
to a circuit with he Fujitsu
Takamisawa FID-828 Hall-effect
sensor (HulaPointTM) or an analog
joystick sensor (like the CTS 252
resistive sensor).

With a HulaPointTM or analog
joystick sensor, the SH1211
supports wait mode and typically
consumes less than 3 mA in
standby.

See also the HulaPointTM sensor
orientation diagram toward the end
of this data sheet.

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SCHEMATIC FOR THE SH1211 MOUSECODER® WITH ANALOG JOYSTICK SENSOR

T_M_DATA

COUT

SCIN

SHIELD

EXT_M

_CLOCK

TX
D

INTS

RTS

M_DA

INTS

LOCK

CTS

LOCK

M_DA

VCC

GND

VCC

GND

VCC

GND

u
n
t
i
n
g

l
e
s

/
2
D

A
T
A

I
E
L
D

/
2
C
L
O
C
K

1206

47pF

CON2

JP
2

FFCC4

1 µF

47pF

SW4

i
ght

100 nF

SW1

Down

SW2

Left

.
01uF

JP
3

_PH_K

JP
1

IN6_SH

100K

CON8

CON2

1
2

2uH

CON2

1
2

10 µF

32-Pin LQF

SH12

11-FG

SWPWR0

SWPWR1

SWPWR2

SWPWR3

VREF

RESET

VSS2

VDD

OSCIN

OSCOUT

VSS

XYSWP

MCLK

EMDAT

XINV

YINV

EMCLK

SENSEL1

MDAT

BCONF

SENSEL2

MB / UB

PS2SEL

TXD

SCLK

SWPWR4

SWPWR5

YAD

XAD

SW3

Middle/Up

CON2

1
2

4.00 MHz

AVX# PBRC-4.00BR

or eqivalent

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