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PDF TTP224B Data sheet ( Hoja de datos )
| Número de pieza | TTP224B | |
| Descripción | 4 keys Touch Pad Detector IC | |
| Fabricantes | TONTEK | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TTP224B (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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TTP224B
4 keys Touch Pad Detector IC
Outline
z The TTP224B TonTouchTM IC is capacitive sensing design specifically for touch pad controls.
The device built in regulator for touch sensor. Stable sensing method can cover diversity
conditions. Human interfaces control panel links through non-conductive dielectric material.
The main application is focused at replacing of the mechanical switch or button. The ASSP
can independently handle the 4 touch pads with 4 direct output pins
Characteristic
z Operating voltage 2.4V ~ 5.5V
z Built-in regulator with external enable/disable option (REGEN pin)
z Operating current, @VDD=3V no load
At low power mode typical 2.5uA, At fast mode typical 13uA
z @VDD=3V operating voltage :
The response time about 160mS at low power mode, 60mS at fast mode
z Sensitivity can adjust by the capacitance（1~50pF）outside for each touch pad
z Provides Fast mode and Low Power mode selection by pad option (LPMB pin)
z Provides direct mode or toggle mode、CMOS output or open drain output、
active high or active low by pad option (TOG/OD/AHLB pin)
z Have the maximum on time 120sec/64sec/16sec/infinite by pad option(MOT1, MOT0 pin)
z Provides Single-key and Multi-key functions by pad option (SM pin)
z After power-on have about 0.5sec stable-time, during the time do not touch the key pad, and
the function is disabled
z Auto calibration for life
z The re-calibration period is about 1 sec within 8 sec after power-on. When key has been
touched within 8 sec or key has not been touched more than 8 sec after power-on, then the
re-calibration period change to 4 sec
Applications
z Wide consumer products
z Button key replacement
15/06/16
Page 1 of 11
Version：1.1
1 page  
Function Description
TTP224B
Ⅰ. Sensitivity adjustment
The total loading of electrode size and capacitance of connecting line on PCB can affect the
sensitivity. So the sensitivity adjustment must according to the practical application on PCB. The
TTP224B offers some methods for adjusting the sensitivity outside
1. by the electrode size
Under other conditions are fixed. Using a larger electrode size can increase sensitivity.
Otherwise it can decrease sensitivity. But the electrode size must use in the effective scope
2. by the panel thickness
Under other conditions are fixed. Using a thinner panel can increase sensitivity. Otherwise it
can decrease sensitivity. But the panel thickness must be below the maximum value
3. by the value of Cs0~Cs3（please see the down figure）
Under other conditions are fixed. Add the capacitors Cs0~Cs3 can fine tune the sensitivity
for single key, that lets all key’s sensitivity identical. When do not use any capacitor to VSS,
the sensitivity is most sensitive. When adding the values of Cs0~Cs3 will reduce sensitivity
in the useful range（1≦Cs0~Cs3≦50pF）
ELECTRODE
K0
Cs0
K1
Cs1
K2
Cs2
K3
Cs3
VDD
VDD TPQ0
TP0
TPQ1
TPQ2
TP1 TPQ3
TP2 VREG
TP3
AHLB
TOG
LPMB
SM
OD
REGEN
MOT0
MOT1
VSS
15/06/16
Page 5 of 11
Version：1.1
5 Page 
Package configuration
TTP224B-ASD
Package Type SSOP-20
TTP224B
Ordering Information
TTP224B
Package Type
Chip Type
TTP224B-XXX
TCP224B
Wafer Type
TDP224B
15/06/16
Page 11 of 11
Version：1.1
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet TTP224B.PDF ] | |
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