B6TS-04LT Omron, B6TS-04LT Datasheet - Page 17

• 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

7.
7.1
Teaching
Such parameters as the quantity of variation judged as on can be set automatically through actual touches on the
electrode. This operation is called “Teaching”.
When teaching, the reference value (REFx), quantity of variation judged as on (THRx) and hysteresis (HYSx) are
updated appropriately, and stored in the EEPROM built into the chip.
Before performing a teaching operation, some preparation is required.
The processing flow is as follows:
During teaching, serial communication is not available.
However, checking the CHG pin allows status to be checked.
Once teaching mode is entered, any input other than /RESET is invalid until the measurement finishes and the chip
comes out of teaching mode. Be aware that serial communication cannot be performed concurrently.
Command code
0x44..0x53 1
Outline of teaching
teaching (HYSx) is calculated as:
If the measured value changes by ∆A due to a touch during teaching, the new hysteresis that is set in
For example, if RHYSx = 2, hysteresis (HYSx) is:
Parameter setting (preparation)
Quantity of variation judged as on
(THRx) [approximate value]
Hysteresis (HYSx)
Teaching measurement count (TCAL)
On-judgment ratio (RTHRx)
Hysteresis ratio (RHYSx)
15
Channel 0 (RHYS0)– Command code 0x43
Channel 1 (RHYS1) Command code 0x49
Channel 2 (RHYS2) Command code 0x4E
Channel 3 (RHYS3) Command code 0x53
Touch measurement (max. Tcal×32 times)
Measurement 8 times→REFx correction
Calculate REFx and HYSx and store in
14
1
Hysteresis (HYSx) = ∆A×(Hysteresis ratio (RHYSx))/16
HYSx = ∆A×2/16 ≒ ∆A×0.13 (about 13% of ∆A)
Initiate teaching
CHG pin to high
CHG pin to high
CHG pin to low
CHG pin to low
Teaching ends
13
1
ROM.
12
1
11
1
10
1
MEAS pin = high, /SETUP pin = low
or MODE command 15 bits = 1
1
9
State of CHG pin (indicating teaching status)
1
8
1
7
During this period touch each
electrode at least three times
1
6
1
5
1
4
D3 D2 D1 D0
3
2
1
0