Professional Touch Sensor Chip Supplier
WTC7508DSI 8-Channel Capacitive-Sensing Touch Button Chip
Number of keys
Key response mode
Dimension of key sense element
Spacing of key sense element
Shape of key sense element
Material of key sense element
Requirements for PCB
Capacitive to digital conversion technology
When it is set as IIC output, WTC7508DSI is the SHIFT mode, and when it is the multi-key
touch, it is reflected in the order of operation. When it is set as BCD output, WTC7508DSI is
the single key output mode, which can only operate one key one time.
Minimum 3mm ×3mm, maximum 30mm ×30mm, to be determined according to actual
demand and panel thickness
Minimum spacing 0.5mm, to be determined according to actual demand，It can be used as
the intensive keyboard.
Arbitrary polygon, rotundity or ellipse, either panel with hole in the middle or hollow panel
PCB copper coil, sheet metal, flat-top cylinder spring, conductive rubber, conductive ink, ITO
layer of conductive glass, etc.
Single-sided PCB and double-sided PCB
Insulating materials, such as organic glass, ordinary glass, tempered glass, plastic, wood
timber, paper, ceramics and stone
0 – 20 mm
Adjustment method of key sensitivity Key sensitivity can be adjusted by changing value of base capacitance CSEL.
Effective touch response time
Operating voltage range
Less than 80 ms
Watering or spraying water on the panel will not cause malfunction of keys; when flooded or
with water accumulation, no abnormal response occurs by touching the panel.
Effectively suppress RFI (radio frequency interference) caused when GSM cell phone is used
to make a call or answer a call next to the panel or a talk proceeds next to the panel over
Operating temperature range
Data transmission interface
IIC and BCD are selectable
Storage temperature range
Chip sealing mode
Various home appliances, security equipment, communication equipment, industrial control
equipment & instruments, entertainment equipment, medical equipment, sport facilities,
Table of Contents
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