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Crystal Free USB with mTouch Demonstration

Crystal Free USB with mTouch Demonstration. www.microchip.com/USBkeypad www.microchip.com/usb. Kit Contents. USB Keypad w/ bumpers USB Keypad Block Diagram 3ft USB A to mini-B 5pin 28/28AWG Cable Lumvatech Company Profile Insert. Crystal Free USB Keypad with mTouch.

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Crystal Free USB with mTouch Demonstration

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  1. Crystal Free USB with mTouch Demonstration www.microchip.com/USBkeypad www.microchip.com/usb

  2. Kit Contents • USB Keypad w/ bumpers • USB Keypad Block Diagram • 3ft USB A to mini-B 5pin 28/28AWG Cable • Lumvatech Company Profile Insert

  3. Crystal Free USB Keypad with mTouch Demonstration Highlights • All features driven by single device – PIC16F1459 • Crystal free USB operation • 18 touch buttons using Capacitive Voltage Divider (CVD) technique • LED backlight with proximity sensing ON and auto power OFF • USB HID interface • Plug and play • Low cost lightweight design • Audio feedback using the piezo buzzer • Development Made Easy • Low-cost development experience • Start with the FREE download • Schematics & ‘C’ source code • Easily modified to your specific application needs Download at www.microchip.com/USBkeypad

  4. Crystal Free USB Keypad – Block Diagram • PIC16F1459 device with USB, 9 Channel ADC, PWM, Active Clock Tuning, etc. • USB powered device • Current consumption < 100 mA

  5. Matrix Key Design Key size 12mm*12mm COLOUMN 2 COLOUMN 0 • Uses mTouch CVD technique • 9 ADC channels - 5 rows * 4 columns • Two columns are also used as proximity sensors • Guard ring to reduce parasitic capacitance on sensors • CVD application note COLOUMN 3 COLOUMN 1 ROW0 • • • • • • • • • • • • • • • • • • • • • • S1 S2 S3 S4 • • • ROW 1 S5 S6 S7 S8 ROW 2 S9 S10 S11 S12 ROW 3 • • S13 S14 S15 Guard S16 S17 S18 ROW 4 Key size 12mm*31mm Guard ring 3mm away from sensors. Thickness 1mm.

  6. LumvatechGraphics, Panel, Keypad PCB • Top panel with graphics printed on it. • 12 side firing LEDs (6 on each side) provide backlighting. • Panels are provided by Lumvatech. (www.lumvatech.com)

  7. High level Firmware Architecture • Firmware Integrates • USB Device Stack • mTouch CVD stack • Both the stacks are part of MLA • MLA is freely downloadable at www.microchip.com/MLA • Application • (keyboard.c) • HID Function Driver • (usb_function_hid.c) • USB Device Stack • mTouchCVD Stack • LED and Buzzer

  8. Simplified Application Flow Chart main() Initialize USB, mTouch() A ISR Send 0x00 to Host No No USBDeviceTasks(); Is any valid mTouch key press detected? Send corresponding key to Host Is USB Device in Configured state? Is proximity Sensor press detected? Is Last USB transfer completed? Buzzer Beep Yes Yes mTouch_Scan(); No No LEDService(); Yes Yes • Activate Keypad • Turn ON LED backlight End of ISR A

  9. Audio Feedback • When Num Lock is ON, buzzer beep frequency is 1000hz • When Num Lock is OFF, buzzer beep frequency is 2500hz • Slightly longer beep for Num Lock ON and OFF • Hold the Clear key for 2 Sec to turn ON/OFF the buzzer feedback. Hold the key until a longer beep is heard from the buzzer.

  10. USB KeypadSummary • All features driven by single device – PIC16F1459 • Active Clock Tuning for crystal Free USB • Saves as much as $0.15 by eliminating external crystal • Guarantees 0.25% accuracy when connected to USB host • USB HID interface – plug and play • Capacitive touch sensing based on CVD technology • LED backlight with proximity sensing ON and auto power OFF • Sleek and low cost design • Easily modified to specific application needs Download schematics & code at: www.microchip.com/USBkeypad

  11. Learn more… Visit us on the web: www.microchip.com/USBkeypad • Quick start guide • Application note and ‘C’ source code • Schematic and board files Visit us on the web: www.microchip.com/USB • USB Development Platforms • USB Reference Designs • USB Application Notes • USB Products & Peripherals

  12. Partner Overview

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