SI314 — Low-Power 14-Channel Capacitive Touch Sensor

The SI314 is a 14-channel capacitive touch sensor with automatic sensitivity calibration and a wide operating voltage range of 1.8–5.5 V.

In sleep mode, power consumption is only 10 μA @ 3.3 V.

Each sensing channel can be independently enabled, calibrated, and sensitivity-adjusted to ensure reliable operation. It features adaptive filtering to handle various noise and environmental changes.

An I²C serial interface allows read/write access to internal registers and touch detection results. Internal registers include write-protection.

Chip Features

• Power-on reset

• 14-channel capacitive sensor with automatic sensitivity calibration

• Selectable output modes

• Independently adjustable sensitivity for each channel

• I²C serial interface support

• Register write-protection

• Built-in high-frequency noise suppression circuitry

• Customizable touch hold time

Applications

• Mobile devices (phones, PDAs, portable media players, etc.)

• Membrane switches

• Multi-key applications (door locks, remote controls, etc.)

• Control panels and keyboards

• Touch screen applications