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SH1412 데이터시트 PDF




Semtech에서 제조한 전자 부품 SH1412은 전자 산업 및 응용 분야에서
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부품번호 SH1412 기능
기능 Capacitive Touchpad Controller
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SH1412 데이터시트, 핀배열, 회로
SH1412
Capacitive Touchpad Cwwown.DtartaoShleleet4rU.com
for Notebook Applications
HID & SYSTEM MANAGEMENT PRODUCTS
DESCRIPTION
The SH1412 capacitive touchpad
controller uses advanced capacitive
position and motion sensing
algorithms. Just a few low-
tolerance external components are
needed.
The touchpad follows the industry
standard of using multiple lines to
detect the presence of a user’s
finger. Once a finger is in close
proximity to the touchpad, its
position is calculated along with its
pressure on the touchpad surface.
Sophisticated algorithms filter out
any noise from the finger, or from
other sources, such as cell phones.
FEATURES
• Light touch and precise control
• Industry-standard PS/2 interface
• Up to 3 buttons for touchpad
features
• Full wheel mouse support
• Highly resistant to EMI and RFI
noise
• > 500 DPI resolution
APPLICATIONS
• Notebooks/laptops
• Consumer products
• Portable/handheld computers
PIN ASSIGNMENTS
• 80 reports per second
• 5 V operating voltage at 4 mA
• Ideal for Chinese character input
• Protected by issued and pending
US and international patents
• Low-tolerance components; Y5V
capacitors and 5% resistors
• 32-pin LQFP package
• Keyboards
• Instrumentation
The SH1412 appears to the host
system as a standard three-button
mouse; no special driver is
required. If the Semtech driver is
used, more advanced functions
such as edge motion, gestures,
and wheel functionality are
available.
Typically consuming less than
4 mA, the SH1412 is ideal for
battery-operated systems. PS/2®
communication is bidirectional at
10 kbps. The SH1412 returns up
to 100 mouse reports per second,
and is compatible with the standard
two-button mouse protocol and the
standard three-button mouse
protocol. It implements all
commands from and to the system
(as defined in the IBM® PS/2
mouse communication protocol).
24
25
C_EN
CNF1
F_DA
A_CLMP
SW_PWR
SW_PWR
AD
R
32
1
SH1412-FGT
LQFP
17
16
9
8
PS2C
PS2D
NMB
NLB
NRB
VSS
_XOUT
XIN
Semtech and the Semtech logo are marks of
Semtech Corporation. IBM and PS/2 are marks of
IBM Corporation. All other marks belong to their
respective owners.
Copyright ©1999-2005 Semtech Corporation
SH1412 data sheet v1.06 (2005-05-02)
1
www.semtech.com




SH1412 pdf, 반도체, 판매, 대치품
SH1412
www.DataSheet4U.com
HOST INTERFACE
The SH1412 communicates with
the host system using the high-
speed PS/2 synchronous interface.
BUILT-IN FEATURES
The SH1412 provides the following
built-in functions:
Tap: Select
Double-tap: Execute
Double-tap, holding and
dragging on the second
tap: Drag
FEATURES WITH DRIVER
EdgeMotion – When pointing
motion on the touchpad reaches
the edge, the cursor continues to
move in the direction it was going
TapZones – Areas on the
touchpad can be configured to run
programs or execute functions
Wheel Mouse – Areas on the
touchpad can be defined to allow
wheel mouse operation
POWER CONSUMPTION
The SH1412 typically consumes less than 4 mA. Low power consumption
makes it ideal for use in battery-operated systems.
SIGNAL CONDITIONING CIRCUIT
The touchpad interfaces with a PCB-based capacitive sensor matrix. The
capacitive sensor consists of 12 horizonal PCB traces (called rows) and 20
vertical PCB traces (called columns). To sample the X position, the
SH1412 scans all columns and measures the the capacitance between the
column traces and the ground plane. The finger's touching above the
column traces adds more capacitance, and the capacitance change is
propotional to the distance and touch area between the finger and the
column. The SH1412 derives the X position value and pressure value from
these capacitance changes. The SH1412 samples the Y position in the
same way. The SH1412 samples all columns and rows one by one, and
shares the same amplifier circuit by using two 16-to-1 analog mux
(multiplexer) chips.
MOUSE EMULATION
The SH1412 emulates a standard 3-button mouse or a standard wheel
mouse. When the Semtech driver is installed, an extended set of features
are available (see Capacitive Touchpad User Interface documentation for
more information). The SH1412 module and driver combination is designed
to compensate for a variety of tricks and fixes that are typically seen in
embedded 8042 keyboard controller chips. These include but are not
limited to the following:
(1) Keyboard controllers automatically reconfiguring the PS/2 channels on
the fly to 3-byte or 4-byte mode.
(2) Keyboard controllers filtering “non-standard” PS/2 commands, meaning
that the “vendor-specific” commands are responded to at the controller level
with either 0xFE or 0xFA values.
Every attempt has been made to send custom commands to the SH1412
device by using standard PS/2 commands so that the minimum of keyboard
controller interference is seen.
Copyright ©1999-2005 Semtech Corporation
SH1412 data sheet v1.06 (2005-05-02)
4
www.semtech.com

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SH1412 전자부품, 판매, 대치품
SH1412
www.DataSheet4U.com
PS/2 MODE COMMANDS
When the reset (0xFF)
command is received, the SH1412
sets the following default
parameters: Incremental Stream
Mode, 1:1 scaling, report rate of
100 Hz, and disabled. It then
sends 0xAA to the host followed by
a device ID of 0x00.
The host sends the resend last
data stream (0xFE) command
when the host detects an error in
any SH1412 transmission. The
device then resends the last output
data packet to the host. This
transmission occurs after a SH1412
transmission and before the host
enables the interface allowing the
next SH1412 output.
The set default status (0xF6)
command re-initializes the device
to its condition at power-up.
The disable (0xF5) command
stops the device from transmitting
all reports. However, the mode
does not change; the SH1412 can
still respond to commands. If the
disable command is issued while
the device is transmitting a report,
the SH1412 immediately stops the
transmission and disables itself.
The reset echo mode (0xEC)
command turns off echo mode.
The set prompt (remote)
mode (0xF0) command sets the
device to prompt mode. Data
values are then reported only in
response to a read report
(0xEB) command.
If the set echo mode (0xEE)
command is received, the SH1412
immediately returns any data bytes
it receives except 0xFF or 0xEC.
If the SH1412 is in Incremental
Stream Mode, the enable
command (0xF4) command
allows it to begin data
transmission. If the device is in
prompt mode, the enable command
only updates the internal status of
the SH1412.
The SH1412 responds to the set
sampling rate (0xF3)
command in both stream and
prompt modes, but it updates its
internal status only if this command
is enacted while the device is in the
stream mode.
The SH1412 responds to the read
device type (0xF2) command
with the device ID of 0x00.
The read report (0xEB)
command prompts the SH1412 for
a position report. The report
occurs even if the device has not
moved and the status of the
switches did not change.
The set incremental stream
mode (0xEA) command sets the
SH1412 to stream mode and
disables the device.
The status request (0xE9)
command returns a 3-byte status
report.
The set resolution (0xE8)
command controls resolution, the
set 2:1 scaling (0xE7)
command enables a coarse/fine
tracking response, and the set 1:1
scaling (0xE6) command
enables the values of movements
to be transmitted to the host
without any scaling. Due to
Semtech’s advanced motion
algorithm, the set resolution and
scaling commands are
acknowledged and reported as
activated, but their status is
ignored.
Copyright ©1999-2005 Semtech Corporation
SH1412 data sheet v1.06 (2005-05-02)
7
www.semtech.com

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SH1412

Capacitive Touchpad Controller

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