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Touch sensitive keyed access controller
AccessTouch is an integrated combination key access
controller featuring tough-sensitive keys for vandal-proof operation. An accompanying
design blueprint is available for a complete low cost, access control product.
AccessTouch uses capacitive touch sensing technology. The
PCB keyboard shown can be overlaid by a non-metallic covering.
It automatically
calculates signal averages to compensate for track capacitance, water splashes,
etc. A buzzer output provides audio feedback as buttons are pressed.
• Low BOM
• Vandal-proof design, no parts need to be physically exposed
• Codes may be up to 8 digits
• Audio feedback on touch press
• Safe Controller mode available
• 20-pin SSOP package
User Operation
When the correct code is entered, the door release output is activated for a fixed
time delay. The sequence of keys pressed prior to entering the code is unimportant.
To change the access code, an electrical switch is closed and the new code is entered
twice. LEDs indicate ‘Open’, ‘Closed’ and ‘Set Code’ states. All LEDs turn off when the device enters a sleep state.
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