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PDF SH2101 Data sheet ( Hoja de datos )
| Número de pieza | SH2101 | |
| Descripción | Force Stick Encoder | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SH2101 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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SH1201 PixiPoint®
Advanced “Click-to-Select”
No-Drift™ Force Stick Encoder
HID & SYSTEM MANAGEMENT PRODUCTS, MOUSECODER® FAMILY
DESCRIPTION
The SH1201 PixiPoint® mouse
encoder is a cost-effective, high-
functionality IC that interfaces a
force-stick sensor to a PS/2 or
serial port. Ideal for laptop or
palmtop use, the low-power
PixiPoint uses an advanced
algorithm for enhanced motion
control. The IC can be configured
as a standard 3-button mouse or
as a wheel mouse. The IC
provides an extra port for hot-plug
connection of an external PS/2
mouse, including one with wheel
function. The embedded sensor
and the external device can
operate concurrently.
FEATURES
• Advanced motion control algorithm
provides accurate cursor control
• Can be configured for PS/2 or
RS232 serial communication with
the host
• Can be configured as a standard 3-
button mouse or a wheel mouse
• Complies with the Microsoft® Plug
and Play External COM Device
specification
• Click (select), double-click
(execute), and slow drag are
implemented in the IC – no special
driver support is required
• Provides built-in profiles to interface
popular force-stick sensors from
several manufacturers
• Supports hot-plug connection of a
standard external PS/2 mouse,
with or without wheel function
• Works with standard Windows®
mouse drivers
• Compatible with IBM force stick
protocol
• CleanStop™ feature means cursor
stops with precision
• In PS/2 mode, supports all
standard PS/2 commands
• Low power consumption:
3.3 mA (typical)
• 2.7 V–5.5 V operation over
extended temperature range
The PixiPoint includes a signal
conditioning circuit for a low cost,
simple and real estate-saving
implementation. Just a few low-
tolerance external components are
needed.
APPLICATIONS
• Notebooks/laptops
• Handhelds
PIN ASSIGNMENTS
• Keyboards
• Instrumentation
Typically consuming less than
3.3 mA, the PixiPoint is ideal for
battery-operated systems.
PS/2 communication is bidirectional
at 10 Kbps. The PixiPoint returns
up to 100 mouse reports per
second, and is compatible with the
standard three-button mouse
protocol and the standard wheel
mouse protocols. It implements all
commands from and to the system
(as defined in the IBM PS/2 mouse
communication protocol).
24
25
_RB
_PS2SEL
TxD
_REGDIS
OFFSET
SWPWR2
AD
ZM
32
1
17
16
9
8
SENSSEL
SWPWR1
EMDAT
MCLK
SWPWR0
VSS
_OSCOUT
OCSIN
Semtech, the Semtech logo, PixiPoint,
PixiCoder, MouseCoder, CleanStop,
EasyDrag, and No-Drift are marks of
Semtech Corporation. All other marks
belong to their respective owners.
Copyright ©1999-2004 Semtech Corporation
SH1201 data sheet v1.17 (2004-10-29)
1
www.semtech.com
1 page  
SH1201
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SERIAL HARDWARE
The TxD and RTS lines are CMOS
logic-level signals, suitable for
direct connection to the pins of an
UART. Interfacing via the RS-232
port requires the addition of an
inverting driver and receiver. A
simple one-transistor inverting
driver and receiver may be used.
SERIAL COMMUNICATION
Communication through the serial port is uni-directional at a fixed speed of
1200 Baud, 7N1 protocol (7 data bits, 1 stop bit, no parity check).
The host can reset the device at any time by setting the RTS line high.
When RTS is set low after a delay of at least 100 ms, the PixiPoint
responds in one of two ways as shown below. Its response depends on its
mode: wheel mode or 3-button mode, as determined by the state of the
down button pin (DB, pin 22).
Wheel mode
When the PixiPoint is in wheel mode, and RTS is set low after a delay of at
least 100 ms, the PixiPoint responds with the two identification characters
“MZ” (0x4D, 0x5A); they are followed by a zero motion report consisting of
the four bytes 0x40, 0x00, 0x00, 0x00, and then by the following plug-and-
play string:
(vvSTH1201\\MOUSE\PNP0F0A\PIXIPOINTcc)
Note that vv represents a 2-byte binary plug-and-play version number, and
cc is a 2-byte binary checksum. Except for those two binary fields, this
plug-and-play string (including the parentheses) consists of ASCII
characters with their codes reduced by 0x20. For further information,
please refer to the Plug and Play External COM Device Specification,
available from Microsoft. See the following web page (subject to change):
http://www.microsoft.com/whdc/resources/respec/specs/pnpcom.mspx
3-button mode
When the PixiPoint is in 3-button mode, and RTS is set low after a delay of
at least 100 ms, the PixiPoint responds with the two identification
characters “M3” (0x4D, 0x33); they are followed by a zero motion report
consisting of the four bytes 0x40, 0x00, 0x00, 0x00, and then by the
following plug-and-play string:
(vvSTH1201\\MOUSE\PNP0F0A\PIXIPOINTcc)
Note that vv represents a 2-byte binary plug-and-play version number, and
cc is a 2-byte binary checksum. Except for those two binary fields, this
plug-and-play string (including the parentheses) consists of ASCII
characters with their codes reduced by 0x20. For further information,
please refer to the Plug and Play External COM Device Specification,
available from Microsoft. See the following web page (subject to change):
http://www.microsoft.com/whdc/resources/respec/specs/pnpcom.mspx
Copyright ©1999-2004 Semtech Corporation
SH1201 data sheet v1.17 (2004-10-29)
5
www.semtech.com
5 Page 
SH1201
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PIXIPOINT EXTENDED PS/2 SPECIFICATION (CONT’D)
Set tap sensitivity (0xC0)
Tap sensitivity register
This command byte is followed by one byte of
data. The extended mode device responds to
each of the two bytes with Acknowledge (0xFA).
The value of the second byte is written to the tap
sensitivity register which controls the tapping
sensitivity of the PixiPoint as shown in this table.
Note: If Z-axis functionality is not required, some
25% savings in power consumption by the
PixiPoint can be realized by termination of the Z-
axis sampling. Whenever the value of the tap
sensitivity register changes to or from the value of
0x80, the PixiPoint performs a self-calibration
cycle of approximately 500 ms duration. The
sensor should not be touched while the self-
calibration cycle is in progress.
Value
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08 – 0x7F
0x80
0x81 – 0xFF
Meaning
OFF
Soft
-
Medium
-
Hard
-
Very Hard
-
OFF
-
Comment
Tap feature is disabled
Default, recommended setting
All these values are reserved
Z-axis sampling is stopped
All these values are reserved
Set translation profile (0xC1)
Translation profile register
This command byte is followed by one
Value
byte of data. The extended mode device 0x00
responds to each of the two bytes with
0x01 – 0xFF
Acknowledge (0xFA). The value of the
second byte controls the translation
profile between the force on the PixiPoint
sensor and relative motion as shown in this table.
Meaning
Semtech Profile #1
Comment
Default, recommended setting
All these values are reserved
Read extended status (0xC2)
The extended mode device responds to the command byte with an Acknowledge (0xFA), and then returns a one-
byte value. See the section on the Write extended status command for the description of the extended status
register.
Write extended status (0xC3)
This command byte is followed by one byte of data. The extended mode device responds to each of the two bytes
with Acknowledge (0xFA). The value of the second byte is written to the extended status register. See the following
table for the description of individual bits.
Note: Possible values for the extended status register are 0x00 to 0x7F (i.e. it is NOT required to pass "special"
values like 0xFF, 0xFE, etc. via the 8042 host).
Copyright ©1999-2004 Semtech Corporation
SH1201 data sheet v1.17 (2004-10-29)
11
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