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ELECTRONICS

TTP223 Touch Switch for Battery-Powered Night Lamp

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UPDATED 2026-08-13
TYPECircuit
USE-CASETtp223 Touch Switch
EXAMPLETTP223 Touch Switch for Battery-Powered Night Lamp
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CASE ANALYSIS

Scenario

A TTP223 capacitive touch sensor IC detects finger contact and drives an NPN transistor to switch an LED night lamp, powered by a 3V battery.

Key decisions

  • Use a 2N2222 NPN transistor because the TTP223 output cannot directly handle the LED current.
  • Add a 100nF decoupling capacitor across the IC supply to keep touch sensing stable.
  • Model the touch pad as a 10pF capacitor to ground so the net is not left open.

When to reuse this

Reuse for any battery-powered capacitive touch lamp or low-power touch-controlled load.

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