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Semtech SX8650 User Manual

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ADVANCED COMMUNICATIONS & SENSING
Revision V2.1/June 2010
©2010 Semtech Corp.
SX8650 Evaluation Kit
VDD
X+
Y+
Touch
X-
Screen
Interface
Y-
Vref
GND
Page 1
User's Guide
SX8650
AUX
Control
A0
NRST
POR
OSC
I2C
SCL
HOST
SDA
ref+
Digital
in
ADC
out
Filter
ref-
NIRQ
SX8650EVK
USER GUIDE
www.semtech.com

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Summary of Contents for Semtech SX8650

  • Page 1 SX8650EVK USER GUIDE ADVANCED COMMUNICATIONS & SENSING SX8650 Evaluation Kit User’s Guide SX8650 Control NRST Touch Screen HOST Interface ref+ Digital Filter Vref ref- NIRQ www.semtech.com Revision V2.1/June 2010 Page 1 ©2010 Semtech Corp.

  • Page 2: Table Of Contents

    Hardware Description .............................. 3 2.1. Overview ................................3 2.2. Content ................................3 2.3. Board ................................3 2.3.1. Connection to the SX8650 ........................3 2.4. Power and analog Interface ..........................4 2.5. Digital Interface ..............................5 Software Description..............................5 3.1. Overview ................................5 3.2.

  • Page 3: General Description

    PC and the SX8650. The right area is dedicated to the SX8650 and the touch screen connectors. The S_ON switch is the SX8650 power supply switch. A red led is lighted in the ON position. When it is switch off the SX8650 is not supplied but the interface circuitry is still powered on.

  • Page 4: Power And Analog Interface

    For maximum flexibility, the SX8650EVK is designed for easy interfacing to multiple analog-sources. The board is powered from the USB. The S_V switch allows the user to test the SX8650 to 3.3V (switch to the left) or 1.85V (switch to the right).

  • Page 5: Digital Interface

    2.5. Digital Interface JP1 header also gives access to the digital control and serial data pins of the SX8650. If an external host is used to test the part, the jumpers JP1 (7-8), JP1 (9-10), JP1 (11-12), JP1 (13-14) should be removed and the SCL, SDA, NRST and NIRQ signals respectively connected to JP1 (8), JP1 (10), JP1 (12), JP1 (14).

  • Page 6: Starting The Gui

    By clicking Measurements, the GUI will allow the user to select what channels to read. If the user is in Manual Conversion Mode and select Auxiliary Channel, a popup will appear to allow determining how to use the Auxiliary Channel. 3.5.2. Auxiliary Channel 3.5.2.1. Overview www.semtech.com Revision V2.1/June 2010 Page 6 ©2010 Semtech Corp.

  • Page 7: Throughput

    When in Manual Conversion Mode, the user may use the AUX pin as a trigger to perform conversions or as a standard analog input. 3.6. Throughput 3.6.1. Overview Figure 5. Throughput www.semtech.com Revision V2.1/June 2010 Page 7 ©2010 Semtech Corp.

  • Page 8: Touch Screen Setup

    Pressure Sensitivity is the number to multiply the final pressure calculation. This creates a larger pen size for smaller pressure measurements. The default settings correspond to the touch screen used on the EVK. 3.8. I2C Setup 3.8.1. Overview www.semtech.com Revision V2.1/June 2010 Page 8 ©2010 Semtech Corp.

  • Page 9: Extras

    Operating System. 3.9. Extras 3.9.1. Overview Figure 8. Extras This area allows different demonstration modes to try out the touch screen with. Currently there is only one other mode, Touchpad Mode. www.semtech.com Revision V2.1/June 2010 Page 9 ©2010 Semtech Corp.

  • Page 10: Display Registers

    3.10. Display Registers 3.10.1. Overview Figure 9. Display Registers If the user desires to view or modify the registers manually, he/she may do so on the Display Registers page. www.semtech.com Revision V2.1/June 2010 Page 10 ©2010 Semtech Corp.

  • Page 11: Convert

    Figure 11. After user clicks View Graph and has touched the screen The user may view a graph display of the data. To go back to a touch screen view, just click View Touch Screen www.semtech.com Revision V2.1/June 2010 Page 11 ©2010 Semtech Corp.

  • Page 12: Clear Data

    Clicking Connected will disconnect the EVK. When it says Disconnected, clicking the button causes a connect to occur. 3.16. Quit 3.16.1. Overview Clicking the Quit button will close out the GUI. www.semtech.com Revision V2.1/June 2010 Page 12 ©2010 Semtech Corp.

  • Page 13: Schematics

    APP_TRIG(1) BCBUS3 BDBUS5 APP_TRIG(2) GND_0 SI/WUB BDBUS6 TOUT BDBUS7 PWREN# PWREN# 2.2k GND_r V3V1reg Title M93C46WMN6 F_SDA SX8650 EVK V1a - I2C Application FT2232D F_SCL 100nF TOUT Size Number Revision TOUT GND3 PCB-E134V02a 100nF GND_USBa DS1631 GND_USBa GND_USBa Date: 4/8/2009...

  • Page 14: Board Outline

    SX8650EVK USER GUIDE ADVANCED COMMUNICATIONS & SENSING 3.18. Board outline 4. References [1] SX8650 Datasheet www.semtech.com Revision V2.1/June 2010 Page 14 ©2010 Semtech Corp.
  • Page 15 Tel: +886 2 2748 3380 Fax: +886 2 2748 3390 EUROPE Semtech Ltd., Units 2 & 3, Park Court, Premier Way, Abbey Park Industrial Estate, Romsey, Hampshire, SO51 9DN. Tel: +44 (0)1794 527 600 Fax: +44 (0)1794 527 601 ISO9001 CERTIFIED www.semtech.com...
  • Page 16 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Semtech SX8650EVKA...

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