B6TS-08NF Omron, B6TS-08NF Datasheet - Page 11

• Manufacturer Part Number: B6TS-08NF
• Description: Capacitance Touch Sensors Sensing IC
• Manufacturer: Omron
• Series: -r
• Type: Capacitiver

Specifications of B6TS-08NF

• Supply Voltage: - 0.3 V to 6.5 V
• Number Of Channels: 8
• Dimensions: 9 mm L x 9 mm W x 1.7 mm H
• Output Voltage: -0.3 V to Vsupply + 0.3 V
• Power Dissipation: 300 mW
• Temperature Range: - 20 C to + 85 C
• Termination Style: SMD/SMT
• Sensitivity: -
• Response Time: -
• Interface: SPI
• Channel Inputs: 8 Key
• Voltage - Supply: 4.5 V ~ 5.5 V
• Actuator Type: -
• Package / Case: 32-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4. Measurement
touch electrode, the electrostatic capacitance of the electrode increases and the discharge time for the charge becomes
shorter. The chip has a built-in counter to measure the discharge period. Whether the sensor has been touched or not is
judged according to whether the length of the discharge period exceeds a specified value or not. Hereafter, the length of
the discharge period is referred to as the measured value.
The drift compensation function can be enabled or disabled in setup mode.
The chip measures the discharge of the charge stored in the charge capacitor. When a finger is placed close to the
Even in the no touched state, the measured value changes according to variation in the environment (output drift).
The chip is provided with an automatic drift-compensation function, which can cancel mild changes of the measured
value due to variation in the environment.
The measured value when the sensor is not touched is called the reference value. The change of the measured value
which allows a judgment that the sensor is touched is called judging change, and the change of the measured value
when returning from on status is called hysteresis. These 3 parameters define the switching characteristics of each
touch channel and can be set for each channel independently.
The relationships between the measured value and the above values are as follows:
[Measured value] < [Reference value]-[judging change]
[Measured value] > [Reference value]-[Judging change]+Hysteresis
Measured
value
Judging
change
Figure 5 . State of touch
Judged as "touched"
11
Touch on
electrode
Hysteresis
→ Touch
→ Touch to no touch
Time
Reference
value