maXTouch 640-node Touchscreen Controller

1 2017 Microchip Technology Inc. DS40001987A-page 1maXTouch Adaptive Sensing Touchscreen Technology Up to 32 X (transmit) lines and 20 Y (receive) lines A maximum of 640 nodes can be allocated to the Touchscreen Touchscreen size inches (16:10 aspect ratio), assuming a sensor electrode pitch of 6 mm. Other sizes may be possible with different electrode pitches and appropriate sensor material Multiple touch support with up to 16 concurrent touches tracked in real timeAutomotive Applications AEC-Q100 Qualified Developed following Automotive SPICE Level 3 certified processes CISPR-25 compliant (for both mutual and self capacitance measurements)Touch Sensor Technology Discrete/out-cell support including glass and PET film-based sensors On-cell/touch-on display support including TFT, IPS and OLED Support for standard (for example, Diamond) and proprietary sensor patterns (review of designs by Microchip recommended)Front Panel Material Works with PET or glass, including curved profiles (configuration and stack-up to be approved by Microchip)

2 Glass mm to mm (dependent on screen size, touch size, configuration and stack-up) Plastic mm to mm (dependent on screen size, touch size, configuration and stack-up)Touch Performance Moisture/Water Compensation- No false touch with condensation or water drop up to 22 mm diameter- One-finger tracking with condensation or water drop up to 22 mm diameter Glove Support Mutual capacitance and self capacitance measurements supported for robust touch detection Noise suppression technology to combat ambient and power-line noise- Up to 240 Vpp between 1 Hz and 1 kHz sinusoidal waveform- Up to 20 Vpp between 1 kHz and 1 MHz sinusoidal waveform Burst Frequency - Controlled Tx burst frequency drift over process and temperature range Scan Speed- Up to 190 Hz one finger reporting rate (subject to configuration)- Typical report rate for 10 touches 60 Hz (subject to configuration)

3 - Initial touch latency <25 ms for first touch from idle (subject to configuration)- Configurable to allow for power and speed optimizationOn-chip Gestures Reports one-touch and two-touch gesturesKeys Up to 32 nodes can be allocated as mutual capacitance sensor keys (subject to other configurations) Adjacent Key Suppression (AKS) technology is supported for false key touch prevention Enhanced Algorithms Lens bending algorithms to remove display noise Touch suppression algorithms to remove unintentional large touches, such as palm Palm Recovery Algorithm for quick restoration to normal stateProduct Data Store Area Up to 60 bytes of user-defined data can be stored during production- Multiple-finger glove touches up to mm thickness (subject to stack-up design)- Single-finger glove touch up to 5 mm thickness (subject to stack-up design)mXT641T-AT/mXT641T-AB 640-node Touchscreen ControllerMXT641T-AT/MXT641T-AB DS40001987A-page 2 2017 Microchip Technology Saving Programmable timeout for automatic transition from active to idle states Pipelined analog sensing detection and digital processing to optimize system power efficiencyApplication Interfaces I2C-compatible slave with support for Standard mode (up to 100 kHz), Fast mode (up to 400 kHz), Fast-mode Plus (up to 1 MHz), High-speed mode (up to MHz) SPI slave interface (up to 8 MHz) Interrupt to indicate when a message is available SPI Debug Interface to read the real-time raw data for tuning and debugging purposesPower Supply Digital (Vdd)

4 V nominal Digital I/O (VddIO) V nominal Analog (AVdd) V nominal High voltage internal X line drive (XVdd) V with internal voltage pump (XVdd = Vdd if voltage pump not used)Package 100-pin TQFP 14 14 1 mm, mm pitchOperating Temperature mXT641T-AT: 40 C to +85 C (Grade 3) mXT641T-AB: 40 C to +105 C (Grade 2)Design Services Review of device configuration, stack-up and sensor patterns Custom firmware versions can be considered Contact your Microchip representative for more informationMXT641T-AT/MXT641T-AB 2017 Microchip Technology Inc. DS40001987A-page 3 PIN CONFIGURATION100-pin TQFPTop View156116601759185819572056215522545375 1002627284099298586413381453282443183433 0844239383480463579473678488795969798888 994939291 9037116512641363146212743734725716707698 689671066232425525149507776 NCVDDIOADDSEL/CHGGNDVDDCOREVDDSSCHG/MISO SDA/MOSISCL/SCKRESETGNDEXTCAP1 EXTCAP0 NCX5X6X8 XVDDGNDX9X11X12X13X14X16 NCNCXVDDGNDX25X26X27X28X29X30X31DS0 NCNCNCNCX4X0X7X10X15 NCNCX1X2X3 COMMSELDBG_DATA/GPIO1 GNDVDDIOGPIO5 TESTSYNC/GPIO4 GPIO3 DBG_SS/GPIO2 DBG_CLK/GPIO0 NCNCX17X18X19X20X21X22X23X24 NCGNDY9Y10Y11Y12Y13Y14Y15Y16Y17Y18Y19 AVDDY8Y6 AVDDY0Y1Y2Y3Y4Y5Y7 NCGNDNCNCmXT641T-AT/mXT641T-ABTop viewMXT641T-AT/MXT641T-AB DS40001987A-page 4 2017 Microchip Technology 1.

5 PIN LISTING 100-PIN TQFPPinNameTypeSupply DescriptionIf No connectionLeave open2 VDDIOP Digital IO interface power 3 EXTCAP0P Connect to EXTCAP1 via capacitor; see Section Schematic Notes Leave open4 EXTCAP1P Connect to EXTCAP0 via capacitor; see Section Schematic Notes Leave open5 GNDP Ground 6 RESETIVddIOReset low. Connection to host system is recommendedPull up to VddIO7 SCLODVddIOI2C Mode: Serial clock SCKISPI Mode: Serial clock8 SDAODVddIOI2C Mode: Serial data MOSIISPI Mode: Serial data Master Output Slave Input9 CHGODVddIOI2C Mode: State change interrupt (active low) MISOOSPI Mode: Serial data Master Input Slave Output10 SSIVddIOSPI Mode: Slave Select line (active low)Pull up to VddIO11 VDDP Digital power 12 VDDCOREP Digital core power 13 GNDP Ground 14 ADDSELIVddIOI2C Mode: I2C address select; see Section I2C Address Selection ADDSEL Pin CHGODSPI Mode: State change interrupt (active low)15 COMMSELIVddIOSelects communications mode; see Section Host Communication Mode Selection COMMSEL Pin 16 DBG_CLKOVddIODebug clock.

6 See Section SPI Debug Interface Connect to test pointleave openGPIO0I/OGeneral purpose I/O17 DBG_DATAOVddIODebug data; see Section SPI Debug Interface Connect to test pointleave openGPIO1I/OGeneral purpose I/O18 DBG_SSOVddIODebug SS line; pull up to VddIO; see Section SPI Debug Interface Connect to test pointleave openGPIO2I/OGeneral purpose I/O19 GPIO3I/OVddIOGeneral purpose I/OInput: connect to GNDO utput: leave open20 SYNCIVddIOExternal synchronizationInput: connect to GNDO utput: leave openGPIO4I/OGeneral purpose I/O21 TESTIVddIOReserved for factory use; pull up to VddIO 22 GPIO5I/OVddIOGeneral purpose I/OInput: connect to GNDO utput: leave open23 VDDIOP Digital IO interface power 24 GNDP Ground 25NC No connectionLeave open26NC No connectionLeave open27NC No connectionLeave openMXT641T-AT/MXT641T-AB 2017 Microchip Technology Inc.

7 DS40001987A-page 528NC No connectionLeave open29X16 SXVddX line connectionLeave open30X15 SXVddX line connectionLeave open31X14 SXVddX line connectionLeave open32X13 SXVddX line connectionLeave open33X12 SXVddX line connectionLeave open34X11 SXVddX line connectionLeave open35X10 SXVddX line connectionLeave open36X9 SXVddX line connectionLeave open37 GNDP Ground 38 XVDDP X line drive power; see Section Internal Voltage Pump 39X8 SXVddX line connectionLeave open40X7 SXVddX line connectionLeave open41X6 SXVddX line connectionLeave open42X5 SXVddX line connectionLeave open43X4 SXVddX line connectionLeave open44X3 SXVddX line connectionLeave open45X2 SXVddX line connectionLeave open46X1 SXVddX line connectionLeave open47X0 SXVddX line connectionLeave open48NC No connectionLeave open49NC No connectionLeave open50NC No connectionLeave open51 GNDP Ground 52 AVDDP Analog power 53Y0 SAVddY line connectionLeave open54Y1 SAVddY line connectionLeave open55Y2 SAVddY line connectionLeave open56Y3 SAVddY line connectionLeave open57Y4 SAVddY line connectionLeave open58Y5 SAVddY line connectionLeave open59Y6 SAVddY line connectionLeave open60Y7 SAVddY line connectionLeave

8 Open61Y8 SAVddY line connectionLeave open62Y9 SAVddY line connectionLeave open63Y10 SAVddY line connectionLeave open64Y11 SAVddY line connectionLeave open65Y12 SAVddY line connectionLeave open66Y13 SAVddY line connectionLeave open67Y14 SAVddY line connectionLeave open68Y15 SAVddY line connectionLeave openTABLE 1:PIN LISTING 100-PIN TQFP (CONTINUED)PinNameTypeSupply DescriptionIf DS40001987A-page 6 2017 Microchip Technology line connectionLeave open70Y17 SAVddY line connectionLeave open71Y18 SAVddY line connectionLeave open72Y19 SAVddY line connectionLeave open73 AVDDP Analog power 74 GNDP Ground 75NC No connectionLeave open76NC No connectionLeave open77NC No connectionLeave open78NC No connectionLeave open79X17 SXVddX line connectionLeave open80X18 SXVddX line connectionLeave open81X19 SXVddX line connectionLeave open82X20 SXVddX line connectionLeave open83X21 SXVddX line connectionLeave open84X22 SXVddX line connectionLeave open85X23 SXVddX line connectionLeave open86X24 SXVddX line connectionLeave open87 XVDDP X line drive power.

9 See Section Internal Voltage Pump 88 GNDP Ground 89X25 SXVddX line connectionLeave open90X26 SXVddX line connectionLeave open91X27 SXVddX line connectionLeave open92X28 SXVddX line connectionLeave open93X29 SXVddX line connectionLeave open94X30 SXVddX line connectionLeave open95X31 SXVddX line connectionLeave open96DS0 SXVddDriven Shield signal; used as guard track between X/Y signals and groundLeave open97NC No connectionLeave open98NC No connectionLeave open99NC No connectionLeave open100NC No connectionLeave openKey:IInput onlyOOutput onlyI/OInput or outputODOpen drain outputPGround or powerSSense pinTABLE 1:PIN LISTING 100-PIN TQFP (CONTINUED)PinNameTypeSupply DescriptionIf 2017 Microchip Technology Inc. DS40001987A-page 7 TABLE OF CONTENTSPin configuration.

10 3 Table of Contents .. 7To Our Valued Customers .. of mXT641T-AT/mXT641T-AB .. Basics .. Layout .. / Reset Requirements .. Operation .. Communications .. Communications .. Communications .. PCB Design Considerations .. Getting Started with mXT641T-AT/mXT641T-AB .. Debugging and Tuning .. Specifications .. Packaging Information .. 60 Appendix A. Associated Documents .. 62 Appendix B. Revision History .. 63 Product Identification System .. 67 The Microchip Web Site .. 68 Customer Change Notification Service .. 68 Customer Support .. 68 MXT641T-AT/MXT641T-AB DS40001987A-page 8 2017 Microchip Technology OUR VALUED CUSTOMERSIt is our intention to provide our valued customers with the best documentation possible to ensure successful use ofyour Microchip products.