TIVA with Captouch booster pack

Naveen4u

Other Parts Discussed in Thread: TM4C123GH6PM

Hi,

I am started working with Tiva lounch pad (TM4c123gh6pm) now I am facing problem while running example project located in Tivaware ie

examples/boards/ek-tm4c123gxl-boost-capsense It wont give any error after compiled after debug and run there is no effect on the captouch boost xl ,

I found in the forum that is calibration 200k resistors should be change at bottom of the booster pack I want to know from R1 to R15 which resistor I should replace or to empty resistor location.

over 9 years ago

0 Danil Borchevkin over 9 years ago

Intellectual 410 points

Hello, Naveen4u!

Calibration process explain in http://processors.wiki.ti.com/index.php/Stellaris_LM4F120_LaunchPad_Capsence_calibration

so it requires the use of external resistors to take measurements from the capacitive sensors on the CAPSENSE booster-pack. The resistors must be chosen such that the charge and discharge times of the capacitive sensors on the booster-pack are reasonably slow compared to the chip's system clock. Also, they should be chosen such that multiple charges and discharges can be measured for each sensor (improves noise tolerance) without taking up too much time (hurts response time). The Stellaris team recommends using resistors of at least 200 kohm, and less than 5 Mohm.

According to Page 14 of Capsense boosterpack user guide

The Capacitive Touch BoosterPack hardware can also be used with other MSP430 devices. Resistors R10 to R15 must be populated with a resistor to realize a RC discharge that can be measured with a timer

0 Naveen4u over 9 years ago in reply to Danil Borchevkin

Intellectual 520 points

Thank you, Danil Borchevkin

Is there any forum or any documents example projects based on captouch+TIVA please let me know.

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TIVA with Captouch booster pack