The LC717A devices are high-performance, low-cost capacitance-to-digital converters which may be used to easily implement an electrostatic capacitive touch sensor. Extremely sensitive, they are capable of detecting tiny changes in capacitance, making them suitable for use in systems operated by users wearing gloves, or through a thick overlay.
The built-in logic circuit detects the on/off state of each input, and produces the result as a digital output. No external components are required for the measurement function.
Calibration is automatically performed by the logic circuit at start-up or whenever there are changes in the operating environment. In addition, once the operating parameters, such as gain, are configured, the LC717Ax0 converters can operate in stand-alone mode when the recommended switch pattern is applied.
Alternatively, the parameters can be modified by an external controller via the device’s I2C or SPI bus interfaces.
|LC717A00AJ||8 (16 - 4x4 matrix)||SSOP-30|
|LC717A00AR||8 (16 - 4x4 matrix)||VCT-28|
|LC717A10AJ||16 (64 - 8x8 matrix)||SSOP-30|
|LC717A10AR||16 (64 – 8x8 matrix)||VCT-28|
- Differential capacitance detection
- 3ms minimum measurement interval
- Automatic noise compensation
- 320μA operating current at 2.8V input
- Supply voltage range: 2.6V to 5.5V
- Security keypads
- Video intercom systems
- Remote controls
- Bath and spa controls
- PC keyboards
- Proximity light switches
- Door openers
- Power saving circuit wake-up