Preliminary

TTP224/TTP224N

2009/8/25

Page 4 of 4

Ver :2.0

TCP224/TCP224N

TCP224/TCP224N APPLICATION (disable internal regulator)

C1

104

K0

K1

K2

Cs3

K3

Cs0

Cs1

Cs2

19

20

21

22

1

2

7

68

9

10

11

VSS

DIS13

REGEN

OD

SM

TPQ3

TPQ2

12

13

14

15

16

17

18

AHLB

5

TP2

3

TP3

4

DIS13

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:

VDD

Option features

Low Power mode

Fast mode

open

LPMB

VSS

VSS

VSS

VSS

open

open

Option features

Maximum on time 64sec

Maximum on time 16sec

Infinite(Disable maximum on time)

Maximum on time 120sec

open

open

MOT0

MOT1

VSS

Option features

SM

Single key mode

Multi-key mode

open

Pad TPQ0D,TPQ2D (has no diode protection) option features

VDD

Toggle mode, Open drain active low output, Power on state high-Z

open

Direct mode, Open drain active low output, Power on state high-Z

TOG

VSS

Enable TP1, TP3

open

Key operation mode:

Option table:

Disable TP1, TP3

Input keys number select:

Option features

Fast and Low power mode:

Maximum key on duration time:

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 power supply must be stable. If the supply voltage drift or shift quickly, maybe

causing sensitivity anomalies or false detections.

3. 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.

4. 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 (TTP224/TTP224N).

5. 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.

6. 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.