Integrated DeviceTechnology
Integrated DeviceTechnology
True Single-Layer Multi-Touch Projected
Capacitive Touch Screen Solution
POWER MANAGEMENT | ANALOG & RF | INTERFACE & CONNECTIVITY | CLOCKS & TIMING | MEMORY & LOGIC |
TOUCH & USER INTERFACE
| VIDEO & DISPLAY | AUDIO
FEATURES
• Full touch screen controller IC with up to 35
sensor channels
• Optimized for IDT’s True Single-Layer Sensor
with Multi-Touch capability
• 10 bit resolution in X & Y directions
• No multi-touch ghosting effect
• Two-finger multi-touch support
• 8ms (120Hz) data rate
• Supports screen sizes of 5” and less
• Low-power mode
• 5x5 40-pin TQFN (LDS7000) or
6x6 48-pin TQFN package (LDS7001)
• I
2
C interface and SPI interface (LDS7001) only
CUSTOMER BENEFITS
• Simplified touch screen sensor manufacturing,
lowering cost of solution
• Easier (artifact-free) host-side gesture recognition
• Faster response to touch inputs
• Enables lower backlight setting,
saving battery power
• Enables efficient roll-to-roll manufacturing
of touch screen sensors
Description
The LDS700x family of devices (LDS7000 and LDS7001) are the world’s first true single layer, full-
touch capacitance screen devices, with multi-touch capabilities. These devices help to enhance
the human-machine interface experience by supporting advanced features such as swipe, ges-
tures, expand and squeeze. Employing a capacitance-to-digital convertor coupled with a unique
and proprietary Indium-Tin-Oxide (ITO) pattern, the LDS7000 products offer best-in-class linearity
and signal to noise ratio performance for all types of applications. The LDS7000 has unique built-in
firmware which provides true x/y data and eliminates multi-touch ghosting effects.
Automatic on-chip calibration takes into account the effects of environmental changes such as
temperature, humidity and dust and ensures to establish an accurate baseline capacitance for
each sensor to ensure maximum responsiveness to true touch events.
The 40-pin LDS7000 supports 30 sensors and uses an I
2
C interface for communicating with the
host. The 48-pin LDS7001 supports 35 sensors and is configurable to use either I
2
C or SPI inter-
faces for communicating with the host.
The LDS700x family supports supply voltages from 2.7 to 3.6V. The 48-pin LDS7001 offers General
Purpose I/O (GPIO). The I
2
C clock and data lines support a 1.8V to 3.6V voltage interface using
the V
DDIO
pin. The SPI interface supports 2.7 to 3.6V operation and V
DDIO
voltage must be the same
as V
DD
.
IDT
|
THE ANALOG + DIGITAL COMPANY
LDS7000 PRODUCT FAMILY OVERVIEW
1
POWER MANAGEMENT | ANALOG & RF | INTERFACE & CONNECTIVITY | CLOCKS & TIMING | MEMORY & LOGIC |
TOUCH & USER INTERFACE
| VIDEO & DISPLAY | AUDIO
Integrated DeviceTechnology
True Single-Layer Multi-Touch Projected
Capacitive Touch Screen Solution
FUNCTIONAL BLOCK DIAGRAMS
V
DDIO
+(1.8V - 3.6V)
Shield
C0
C1
C29
VDD +(2.7V - 3.6V)
V
DD
V
CAP
1µF
GND
1µF
GND
GND
Test
V
SS
V
DDIO
4.7k
4.7k
4.7k
V
DDIO
APPLICATIONS
• Mobile handsets, personal media players
• Portable navigation devices
• Remote controls
• Office equipment, multi-function printers
• Set top boxes
• Home appliances
• Brown goods
• Industrial controls
• Digital cameras
• Consumer products
Touch Screen
Host
Processor
with I
2
C
LDS7000
HS
SCK/SCL
SDO/SDA
SD1/A0
CS/A1
RESET
I/F SEL
GND
GPIO
SCL
SDA
GPIO
V
SS
GND
GND
4.7k
Touch Screen
Shield
C0
C1
C34
VDD +(2.7V - 3.6V)
V
DD
V
CAP
1µF
GND
1µF
GND
GND
Test
V
SS
V
DDIO
4.7k
4.7k
V
DD
Host
Processor
with SPI
LDS7001
HS
SCK/SCL
SDO/SDA
SD1/A0
CS/A1
RESET
I/F SEL
GND
GPIO
SCK
MISO
MOSI
CS
GPIO
V
SS
PRODUCT SPECIFICATIONS
Part Number
Touch Sensors
30
35
SPI Interface
-
Yes
I
2
C Interface
Yes
Yes
GPIO’s
0
1
Package
5 x 5 x 0.75mm
40-pin TQFN
6 x 6 x 0.75mm
48-pin TQFN
Discover what IDT know-how
can do for you:
www.IDT.com/go/Touch
LDS7000
LDS7001
DISCLAIMER Integrated Device Technology, Inc. (IDT) and its subsidiaries reserve the right to modify the products and/or specifications described herein at any time and at IDT’s sole discretion. All information in this document, including descriptions of product features and performance, is subject to change without notice. Performance specifications and the operating parameters
of the described products are determined in the independent state and are not guaranteed to perform the same way when installed in customer products. The information contained herein is provided without representation or warranty of any kind, whether express or implied, including, but not limited to, the suitability of IDT’s products for any particular purpose, an implied
warranty of merchantability, or non-infringement of the intellectual property rights of others. This document is presented only as a guide and does not convey any license under intellectual property rights of IDT or any third parties. IDT’s products are not intended for use in life support systems or similar devices where the failure or malfunction of an IDT product can be reasonably
expected to significantly affect the health or safety of users. Anyone using an IDT product in such a manner does so at their own risk, absent an express, written agreement by IDT.
Integrated Device Technology, IDT and the IDT logo are registered trademarks of IDT. Other trademarks and service marks used herein, including protected names, logos and designs, are the property of IDT or their respective third party owners. © Copyright 2011. All rights reserved.
OV_LDS7000FAMILY_REVA0111
IDT
|
THE ANALOG + DIGITAL COMPANY
LDS7000 PRODUCT FAMILY OVERVIEW
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