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SX8650 Datasheet Preview

SX8650 Datasheet

Worlds Lowest Power & Smallest Footprint 4-wire Resistive Touchscreen Controller

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SX8650
World’s Lowest Power & Smallest Footprint 4-wire
Resistive Touchscreen Controller with 15kV ESD
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
4
GENERAL DESCRIPTION
KEY PRODUCT FEATURES
The SX8650 is an ultra low power 4-wire resistive
touchscreen controller optimized for portable equipment
where power and board-space are at a premium.
It incorporates a highly accurate 12-bit ADC for data
conversion and operates from a single 1.65 to 3.7V supply
voltage.
The SX8650 features a built-in preprocessing algorithm for
data measurements, which greatly reduces the host
processing overhead and bus activity. This complete
touchscreen solution includes four user-selectable
operation modes which offer programmability on different
configurations such as conversion rate and settling time,
thus enable optimization in throughput and power
consumption for a wide range of touch sensing applications.
The touch screen inputs have been specially designed to
provide robust on-chip ESD protection of up to ±15kV in
both HBM and Contact Discharge, and eliminates the need
for external protection devices.
The SX8650 supports the Fast-mode I²C (400kbit/s) serial
bus data protocol and includes 2 user-selectable slave
addresses. A custom I2C address is possible on request.
The SX8650 is offered in two tiny packages: 3.0 mm x
3.0 mm DFN and a 1.5 mm x 2.0 mm wafer-level chip-scale
package (WLCSP).
APPLICATIONS
Extremely Low Power Consumption: 23uA@1.8V 8kSPS
Superior On-chip ESD Protection
±15kV HBM (X+,X-,Y+,Y-)
±2kV CDM
±25kV Air Gap Discharge
±15kV Contact Discharge
±300V MM
Single 1.65V to 3.7V Supply/Reference
Integrated Preprocessing Block to Reduce Host Loading
and Bus Activity
Four User Programmable Operation Modes provides
Flexibility to address Different Application Needs
Manual, Automatic, Pen Detect, Pen Trigger
High Precision 12-bit Resolution
Low Noise Ratiometric Conversion
Selectable Polling or Interrupt Modes
Touch Pressure Measurement
400kHz Fast-Mode I²C Interface
Hardware Reset & I²C Software Reset
-40°C to 85°C Operation
12-LD (3.0 mm x 3.0 mm) DFN Package
12-Ball (1.5 mm x 2.0 mm) WLCSP Package
Pin-compatible with SX8651
Pb-Free, Halogen Free, RoHS/WEEE compliant product
Windows CE 6.0, Linux Driver Support Available
Portable Equipment
Mobile Communication Devices
Cell phone, PDA, MP3, GPS, DSC
Touch Screen Monitors
Block Diagram
ORDERING INFORMATION
Part Number
SX8650ICSTRT1
SX8650IWLTRT1
1. 3000 Units / reel
Package
12 - Ball WLCSP (1.5 mm x 2.0 mm)
12 - Lead DFN (3.0 mm x 3.0 mm)
VDD SX8650 AUX
Control
A0
X+
Y+
X-
Touch
Screen
Y- Interface
GND
Vref
NRST
POR OSC I2C
SCL
ref+
in ADC out
ref-
Digital
Filter
SDA
NIRQ
HOST
Revision V2.19/October 2010
©2010 Semtech Corp.
Page 1
www.semtech.com




Semtech

SX8650 Datasheet Preview

SX8650 Datasheet

Worlds Lowest Power & Smallest Footprint 4-wire Resistive Touchscreen Controller

No Preview Available !

SX8650
ADVANCED COMMUNICATIONS & SENSING
Table of contents
Section
DATASHEET
Page
1. General Description ................................................................................................................................................. 4
1.1. DFN Pinout Diagram and Marking Information (Top View).............................................................................. 4
1.2. WLCSP Pinout Diagram and Marking Information (Top View) ........................................................................ 4
1.3. Pin Description................................................................................................................................................. 5
1.4. Simplified Block Diagram ................................................................................................................................. 5
2. Electrical Characteristics ......................................................................................................................................... 6
2.1. Recommended Operating Conditions.............................................................................................................. 6
2.2. Thermal Characteristics ................................................................................................................................... 6
2.3. Electrical Specifications ................................................................................................................................... 7
2.4. Host Interface Specifications ........................................................................................................................... 9
2.5. Host Interface Timing Waveforms.................................................................................................................. 10
2.6. Typical Operating Characteristics .................................................................................................................. 11
3. Functional Description ........................................................................................................................................... 13
3.1. General Introduction ..................................................................................................................................... 13
3.2. Channel Pins.................................................................................................................................................. 13
3.2.1. X+, X-, Y+. Y- .......................................................................................................................................... 13
3.2.2. AUX ......................................................................................................................................................... 13
3.3. Host Interface and Control Pins ..................................................................................................................... 14
3.3.1. NIRQ ....................................................................................................................................................... 14
3.3.2. SCL ......................................................................................................................................................... 14
3.3.3. SDA ......................................................................................................................................................... 14
3.3.4. A0 ............................................................................................................................................................ 15
3.3.5. NRST ...................................................................................................................................................... 15
3.4. Power Management Pins............................................................................................................................... 15
3.4.1. VDD......................................................................................................................................................... 15
3.4.2. GND ........................................................................................................................................................ 15
4. Detailed Description............................................................................................................................................... 16
4.1. Touch Screen Operation................................................................................................................................ 16
4.2. Coordinates Measurement............................................................................................................................. 17
4.3. Pressure Measurement.................................................................................................................................. 17
4.4. Pen Detection ................................................................................................................................................ 18
5. Data Processing .................................................................................................................................................... 19
5.1. Host Interface and Control ............................................................................................................................. 19
5.1.1. I2C Address ............................................................................................................................................ 19
5.1.2. I2C Write Registers ................................................................................................................................. 20
5.1.3. I2C Read Registers ................................................................................................................................. 21
5.1.4. I2C Host Commands ............................................................................................................................... 21
5.1.5. I2C Read Channels ................................................................................................................................ 22
5.1.6. Data Channel Format ............................................................................................................................. 23
Revision V2.19/October 2010
©2010 Semtech Corp.
Page 2
www.semtech.com


Part Number SX8650
Description Worlds Lowest Power & Smallest Footprint 4-wire Resistive Touchscreen Controller
Maker Semtech
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