Preliminary

TTP224N-BSB

TonTouch

TM

2014/06/05

Page 7 of 9

Ver :3.1

APPLICATION CIRCUIT

BSB-APP

2014/6/5

01

01

11:02:36 上午

BSB-APP

.

TTP224N-BSB SSOP-16

TTP224N-BSB APPLICATION

VDD

VSS

VSS

VDD

VDD

VDD

VDD

VSS

VSS

VSS

VSS

VDD

VDD

VDD

VDD

Pad TPQ0~TP3 option features

open

Direct mode, CMOS active low output

open

open

Direct mode, CMOS active high output

open

open

open

AHLB

TOG

OD

Toggle mode, Power on state high-Z, Active low

Toggle mode, Power on state high-Z, Active high

Toggle mode, COMS output, Power on state=1

Toggle mode, COMS output, Power on state=0

Direct mode, Open drain active low output

Direct mode, Open drain active high output

open

open

open

open

open

open

Output mode:

Option features

Fast and Low power mode:

Low Power mode

Fast mode

open

LPMB

Option features

Maximum on time 16sec

Infinite(Disable maximum on time)

open

MOT0

VSS 10

MOT0 9

OD 11

SM 12

TPQ3 13

TPQ2 14

TPQ1 15

TPQ0 16

C1

104

8 LPMB

7 TOG

K3

K2

K1

K0

6 VDD

Cs3

Cs2

Cs1

Cs0

5 AHLB

4 TP3

3 TP2

2 TP1

1 TP0

Key operation mode:

Option features

Single key mode

Multi-key mode

SM

open

Maximum key on duration time:

Option table:

PS：1. On PCB, the length of lines from touch pad to IC pin shorter is better.

And the lines do not parallel and cross with other lines.

2. The material of panel covering on the PCB can not include the metal or the electric

element. The paints on the surfaces are the same.

3. The C1 capacitor must be used between VDD and VSS; and should be routed with

very short

tracks to the device’s VDD and VSS pins .

4. The capacitance Cs0~Cs3 can be used to adjust the sensitivity. The value of

Cs0~Cs3 use smaller, then the sensitivity will be better. The sensitivity adjustment

must according to the practical application on PCB. The range of Cs0~Cs3 value

are 0~50pF.

5. The sensitivity adjustment capacitors (Cs0~Cs3) must use smaller temperature

coefficient and more stable capacitors. Such are X7R, NPO for example.

So for touch application, recommend to use NPO capacitor, for reducing that the

temperature varies to affect sensitivity.