You want to enhance the style and functionality of your new designs?
But it is too complex to replace mechanical tact switches by touch switches?
ROHM has developed the following two Capacitive Touch Sensor ICs, which allow the implementation in 5V systems as direct replacements of mechanical switches!
The “BU21050FS” has 8 capacitive touch pad sensor inputs and those directly control 8 output pins. Optionally the output can be configured with 4 pins as binary words. I.e. this IC can replace up to 8 mechanical switches.
The “BU21051FS” has 2 capacitive touch pad sensor input channels, which directly link into two output control pins. I.e. this IC can replace 2 mechanical switches.
Capacitive Touch Sensor control ICs widely known in industry are typically configured inside complex µC architectures. Those traditional designs require software control, which can be highly complex and costly to develop and also costly to program in the manufacturing chain.
The BU21050FS and BU21051FS from ROHM Semiconductor reduce such development costs and manufacturing costs to a minimum.
Also, they allow the use of a wide range of conductive materials as electrodes (Cu, ITO, conductive polymer, etc.) as well as all kinds of non-conductive overlays (glass, acrylic, plastics, etc.)
The settings of the sensitivity, of the noise suppression level and other functions are done cheaply by external resistors or by pulling the respective pin to GND or VCC.
ROHM Semiconductor GmbH supports your design with full documentation. Samples are available. Evaluation boards can be arranged on request.
Typical applications: White goods, brown goods, consumer electronic devices, lighting controls, etc.
Key Features Summary:
- Internal Clock & Power On Reset
- Automatic Self-Calibration and Re-Calibration
- 5V operation voltage: 4.5V ~ 5.5V
- Low Power consumption
550uA or less (Operating)
100uA or less (Idle)
<2uA (Standby)
- Simultaneous pushing banned/allowed selectable
- No Software Control
BU21050FS:
8 sensor channels PIO or 4-bit Binary Word Output
Package: SSOP-A32 (7.8mm * 13.6mm * 1.8mm ; 0.8mm pin pitch)
BU21051FS:
2 sensor channels PIO Output
Package: SSOP-A16 (6.6mm * 6.2mm * 1.5mm ; 0.8mm pin pitch)
