产品名称:

WTC6312BSI

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  • 工作电路
  • 参考方案

Operating voltage: 3.3V

Output voltage range: GND

Sensing thickness (insulating medium): 0-20mm

Response time of effective touch: Less than 150ms

Operating temperature: -40°C—+85°C

Storage temperature: -50°C—+125°C


Be applicable to various kitchen apparatuses, audio and video devices, air conditioners, sanitary electrical apparatuses, lights and switches, security equipment, instruments, portable player, mobile phones, electronic toys and learning machines.


WTC6312BSI(W) Inductive touch key chip of twelve-channel electric capacitance

Fast Browsing (V1.6)

WTC6312BSI(W) series touch sensing IC is an integrated circuit designed to achieve human touch interface. It can replace the mechanical light touch key to realize waterproof and dustproof, seal isolation, with strong and artistic operation interface. A WTC6312BSI(W) can achieve 4 to 12 independent keys. The user can use it flexibly according to the needs.


Definitions of WTC6312BSI(W) Pins:

引脚图6.jpg

Figure 1:WTC6312BSI(W) pin configuration diagram

 

The definitions of WTC6312BSI(W) pins:

Pin No.Pin NameUsageFunction Description
1SW7|Sense element of key 7
2SW6|Sense element of key 6
3SW5|Sense element of key 5
4SW4|Sense element of key 4
5SW3|Sense element of key 3
6SW2|Sense element of key 2
7SW1|Sense element of key 1
8SW15|Sense element of key 0
9
CSEL|Capacitor interface for adjusting the sensitivity
10GND |Power ground
11SCSS |

When the selection foot of the work mode: connects VCC, the single key working mode is selected, and when it connects to GND, the multi-key combination (SHIFT) mode is selected.

12S1|The S1 must be connected to VCC usufully for the internal test foot
13SDI |Data input line of the chip SPI interface
14SDO OThe data output line of the chip SPI interface
15SCK|

The clock input line of the chip SPI interface

16SCS |

The chip selection enabled line of the Chip SPI interface

17
/RST|

Chip reset pin

18VCC|positive power supply output
19OUT_FLAG O

The key state indicator: when there is key pressed, it outputs the low level signal of 50mS

20TSOThe TS must be connected to VCC usufully for the internal test foot
21SW11|

Sense element of key 11

22SW10|

Sense element of key 10

23SW9|Sense element of key 9
24SW8|Sense element of key 8

 

Output Display:

 Sequence diagram of BCD interface output

When the effective touch on the sense element occurred is detected, the foot of OUT_ FLAG of WTC6312BSI(W) within 150ms will output the level signal of 50ms. The customer can use this signal to realize the key awakening function, and at the same time, can externally connect a triode to drive a DC buzzer to realize the voice indication of the touch key . As shown in figure 2.

WTC6312BSI

                                Figure 2: The signal driving buzzer of OUT_FLAG

OUT_FALG is an indication pulse that is output after the touch key is touched, but it does not indicate the touch time of the key. The key value of the touch key will kept on the finger all the time until the finger is left, and can it be continually read and judged in the program.

The SPI interface of WTC6312BSI(W)

 SPI sequence diagram

The SPI time sequence diagram is shown in figure 3:

WTC6312BSI

                   Figure 3: Sequence diagram of the SPI interface of WTC6312BSI(W)

Multi-key combination (SHIFT) mode

The peripheral circuit of the multi-key combination (SHIFT) mode and the matters needing attention

The peripheral circuit of WTC6312BSI(W) is very simple, and only needs a few resistors and capacitors. The key component is capacitor CSEL for adjusting the sensitivity and IK resistance group for measuring the matched impedance of circuit. CSEL should use 10%-precision polyester capacitor, capacitor made of NOP material paster or capacitor made of X7R material paster. 1K resistance group can provide you with the best and most stable measurement effect, and CSEL and matched resistance shall be placed as close as possible to IC at PCB layout.

Figure 5 is the application circuit diagram of WTC6312BSI(W) of WTC6312BSI(W) work under the multicity combination of 12 keys(SHIFT) mode

WTC6312BSI

Figure 4: Application schematic diagram of WTC6312BSI(W) under multi-key combination (SHIFT) working mode


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