BU21079F Datasheet, PDF (1/37 Pages) Rohm – Capacitive Switch Controller ICs

Capacitive Controller ICs
Capacitive Switch Controller ICs
BU21079F
General Description
BU21079F is a capacitive switch controller used for
operating switches.
Low power consumption is achieved using the
intermittent operation mode.
In addition to a regular simple switch, it supports matrix
switches which are arranged in the matrix sensors. If
external noise and temperature drift are detected, the
automatic self-calibration is activated.
Features
■ 8 capacitive sensor ports
■ Supports matrix switches. Maximum of 16
switches.
■ Automatic self-calibration
■ Continued touch detection
■ Sends an interrupt when there is a detected result
of switch operation
■ 2-wire serial bus interface
■ 3.3V or 5.0V single power supply
■ Built-in Power-On-Reset and Oscillator
Applications
■ Electronic devices with multiple switches.
■ Information appliances such as printers.
■ AV appliances such as digital TV and HDD
recorder.
■ Notebook PC.
■ Air-conditioner. Refrigerator. Electrical rice cooker.
Typical Application Circuit
Key Specifications
■ Input voltage range
■ Operating temperature range
■ Operating current
■ Detect cycle
Packages
BU21079F :
3.0V to 5.5V
-25℃ to 85℃
2.5mA (Typ)
6msec (Typ)
SOP16
10.00 ㎜×6.20 ㎜×1.71 ㎜
Figure 1. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit ○This product has no designed protection against radioactive rays
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TSZ02201-0Y1Y0FZ00150-1-2
2013.09.25 Rev.001