B6TS-04LT Omron, B6TS-04LT Datasheet - Page 9

• 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

3.
4.
Operating modes
This chip has three operating modes. Each mode is selected by inputs to the MEAS pin and /SETUP pin.
Measurement
touch electrode, the electrostatic capacitance of the electrode increases and the discharge period for the charge
becomes shorter. The chip has a built-in counter to measure the discharge period, and whether or not the sensor has
been touched 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.
With this chip, the measured value when the sensor is not touched (reference value), the amount of variation of the
measured value which allows a judgment that the sensor is touched (amount judged on), and the amount of variation
of the measured value when returning from on status (hysteresis) can be set for each channel respectively.
The relationships between the measured value and the above values are as follows:
(1)
(2)
(3)
The chip measures the discharge of the charge stored in the charge capacitor. When a finger is placed close to the
(1-1) On/off output mode ----
(1-2) Serial communication mode --- Measured results are transmitted in serial with a three-wire SPI function
/SETUP pin
Normal measurement mode ----
Setup mode ----
Teaching mode ----
/SETUP pin = High
High
High
Low
Low
MEAS pin
Setup mode
High
High
Low
Low
On/off output mode
MEAS pin = High or MODE command bit15 = 1)
Normal measurement mode
Normal measurement mode (standby status without
executing measurement)
Teaching mode
Setup mode
/SETUP pin = Low and
MEAS pin = Low
Normal measurement mode
Setup mode is entered and MODE
command bit0 = 1
Teaching finish and
/SETUP pin = Low
can be selected according to the output signal form.
Out0-3 signals are used.
Chip operation is set for serial communication in this mode.
no-touch while somebody touches the sensor.
Setup mode is entered and MODE
command bit0 = 0
Mode to detect touch/no-touch. In this mode, one of the following modes
Touch/no-touch detection results are output from the respective channels
with low/high signal.
using SCK, SD and SCS signals.
Teaching refers to the automatic setting of threshold values for touch and
/SETUP pin = Low and
MEAS pin = High
Operation mode
communication mode
Serial
Teaching mode
Teaching finish and
/SETUP pin = High