SX8650 Datasheet, PDF (3/56 Pages) Semtech Corporation – World’s Lowest Power & Smallest Footprint 4-wire Resistive Touchscreen Controller with 15kV ESD

SX8650
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Table of contents
Section
Page
1. General Description ................................................................................................................................................. 4
1.1. Pin Diagram DFN............................................................................................................................................. 4
1.2. Marking Information DFN................................................................................................................................. 4
1.3. Pin Diagram WLCSP ....................................................................................................................................... 5
1.4. Marking Information WLCSP ........................................................................................................................... 5
1.5. Pin Description................................................................................................................................................. 6
1.6. Simplified Block Diagram ................................................................................................................................. 7
2. Electrical Characteristics ......................................................................................................................................... 8
2.1. Absolute Maximum Ratings ............................................................................................................................. 8
2.2. Recommended Operating Conditions.............................................................................................................. 9
2.3. Thermal Characteristics ................................................................................................................................... 9
2.4. Electrical Specifications ................................................................................................................................. 10
2.5. Host Interface Specifications ......................................................................................................................... 12
2.6. Host Interface Timing Waveforms.................................................................................................................. 13
2.7. Typical Operating Characteristics .................................................................................................................. 14
3. Functional Description ........................................................................................................................................... 16
3.1. General Introduction ..................................................................................................................................... 16
3.2. Channel Pins................................................................................................................................................. 17
3.2.1. X+, X-, Y+. Y- .......................................................................................................................................... 17
3.2.2. AUX ......................................................................................................................................................... 17
3.3. Host Interface and Control Pins ..................................................................................................................... 18
3.3.1. NIRQ ....................................................................................................................................................... 18
3.3.2. SCL ......................................................................................................................................................... 18
3.3.3. SDA ......................................................................................................................................................... 18
3.3.4. A0 ............................................................................................................................................................ 19
3.3.5. NRST ...................................................................................................................................................... 19
3.4. Power Management Pins............................................................................................................................... 20
3.4.1. VDD......................................................................................................................................................... 20
3.4.2. GND ........................................................................................................................................................ 20
4. Detailed Description............................................................................................................................................... 21
4.1. Touch Screen Operation................................................................................................................................ 21
4.2. Coordinates Measurement............................................................................................................................. 22
4.3. Pressure Measurement.................................................................................................................................. 23
4.4. Pen Detection ................................................................................................................................................ 25
4.5. Data Processing............................................................................................................................................. 26
4.6. Host Interface and Control ............................................................................................................................. 28
4.6.1. I2C Address ............................................................................................................................................ 28
4.6.2. I2C Write Registers ................................................................................................................................. 29
4.6.3. I2C Read Registers ................................................................................................................................. 30
4.6.4. I2C Host Commands ............................................................................................................................... 31
ACS Revision V2.15/October 2009
©2009 Semtech Corp.
Page 2
www.semtech.com