TTP224B-COBN Datasheet, PDF (7/9 Pages) Tontek Design Technology – TTP224B-COBN

Application circuit
TTP224B-COBN
K0
Cs0
K1
Cs1
K2
Cs2
K3
Cs3
104
C1
1 TP0
2 TP1
3 TP2
4 TP3
5 AHLB
6 VDD
7 TOG
8 LPMB
TPQ0 16
TPQ1 15
TPQ2 14
TPQ3 13
SM 12
OD 11
VSS 10
MOT0 9
Option table:
Output Mode:
TOG OD
OPEN OPEN
OPEN OPEN
OPEN VSS
OPEN VSS
VDD OPEN
VDD OPEN
VDD VSS
VDD VSS
AHLB Pad TPQ0~TP3 option features
OPEN Direct mode, CMOS active high output
VDD Direct mode, CMOS active low output
OPEN Direct mode, Open drain active high output
VDD Direct mode, Open drain active low output
OPEN Toggle mode, CMOS output, Power on state =0
VDD Toggle mode, CMOS output, Power on state =1
OPEN Toggle mode, Power on state high-Z, Active high
VDD Toggle mode, Power on state high-Z, Active low
Key operation mode:
SM ^{Option features}
OPEN Multi-key mode
VSS Single key mode
Maximum key on duration time:
MOT0 Option features
VSS Maximum on time 16sec
OPEN Infinite(Disable maximum on time)
Fast and Low power mode:
LPMB Option features
VDD Fast mode
OPEN Low Power mode
P.S.：
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 (TTP224B-COBN).
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 1~50pF.
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.
2015/12/29
Page 7 of 9
Version：1.1