B6TS-04LT Omron, B6TS-04LT Datasheet - Page 10

• Manufacturer Part Number: B6TS-04LT
• Description: Capacitance Touch Sensors Sensing IC
• Manufacturer: Omron
• Series: -r
• Type: Capacitiver

Specifications of B6TS-04LT

• Sensitivity: -
• Response Time: -
• Interface: SPI
• Channel Inputs: 4 Key
• Voltage - Supply: 3 V ~ 5 V
• Actuator Type: -
• Package / Case: 20-LSSOP (0.173", 4.40mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.
[Measured value] < [Reference value]-[Variation judged on] →
[Measured value] > [Reference value]-[Variation judged on]+[Hysteresis] →
Even in the touched state, the measured value changes according to variation in the environment (output drift).
The chip is provided with an automatic drift-correction function, which can cancel mild changes of the measured
value due to variation in the environment (drift correction function).
It is possible to select whether or not to execute drift correction in setup mode.
Serial communication
It is possible to read out measured values and set the operation mode by sending/receiving data to/from this chip
through serial communication.
Serial communication is performed by a three-wire type SPI-compliant method using SCS (chip select), SCK
(transfer clock) and SD (data (bi-directional)).
The SPI communication method works as follows:
(Refer to “Electrical specifications” for specific communication timing, etc.)
This chip sends/receives data using 4 bytes, consisting of commands, dummy data, and data.
If data communication is performed during normal measurement mode, the measurement operation stops while the
data is communicated.
After communication finishes, measurement restarts.
Write(data flow: host→B6T)
Read(data flow:B6T→host)
• Operation in SPI slave mode
• SCK (transfer clock) is set to high during idling. The data is latched at the rising edge of the clock.
• The data is MSB first.
Command: 1 byte (MSB 1 bit is used for the read/write flag.)
Dummy data: 1 byte (ignored)
Data: 2 bytes
Measured value
Amount of variation
allowing a touch
judgment
Supply /SCS (chip select) and SCK (transfer clock) from outside.
Dummy data(8bit)
Dummy data(8bit)
Touch judged
Data(higher-order 8bit)
Touch on electrode
Data(higher-order 8bit)
Hysteresis
Time
Data(Lower-order8bit)
Data(Lower-order8bit)
Touch
Return from touch to no-touch
Reference value