Document
1 key Touch Pad Detector IC
TTP233C
Outline
z The TTP233C TonTouchTM is a touch pad detector IC which offers 1 touch key. The device
built-in regulator for touch sensor. Stable sensing method can cover diversity conditions. The
touching detection IC is designed for replacing traditional direct button key with diverse pad
size. Low power consumption and wide operating voltage are the contact key features for DC
or AC application.
Characteristic
z Operating voltage 2.4V ~ 5.5V z Built-in regulator for touch sensor z Operating current, @VDD=3V no load
At low power mode typical 2.5uA, maximum 5uA At fast mode typical 5uA, maximum 10uA z The response time max about 60mS at fast mode, 220mS at low power mode @VDD=3V
z Sensitivity can adjust by the capacitance(1~50pF)outside
z Stable touching detection of human body for replacing traditional direct switch key z Provides Fast mode and Low Power mode selection by pad option (LPMB pin) z Provides normal mode and delay-off mode selection by pad option (DLYB pin) z Provides output type selection by pad option (TOG pin)
Direct output or toggle output selection on normal mode Delay-off mode-1 or mode-2 selection on delay-off mode z Provides maximum on time and delay-off time selection by pad option (MOTA, MOTB pin) z Q pin is CMOS output can be selected active high or active low by pad option (AHLB pin) OPDO that has no diode protection, active low 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 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
2015/11/10
Page 1 of 11
Version:1.1
Block diagram
TTP233C
I
LPMB MOTA MOTB
Sensor oscillator circuit
Timing counter & function option control circuit
Sensor & Reference detecting circuit
Touch detecting circuit
Output mode
& driver circuit
Q OPDO
System oscillator circuit
Regulator circuit
Pin Description
Key-on & timing control
TOG AHLB DLYB
Pad NO Pad Name Type
1 QO
2 OPDO OD
3
VSS
P
4 LPMB I-PH
5 TOG I-PL
6
VDD
P
7 AHLB I-PL
8 DLYB I-PH
9 MOTB I-PH
10 MOTA I-PH 11 I I/O
Pad Description
CMOS output pin
Open drain output pin active low(have no Diode protective circuit)
Negative power supply, ground
Low power mode selection, 1(Default)=>Fast mode; 0=>Low power mode
Output type option pin, Normal mode: 0(Default)=>Direct output; 1=>Toggle output Delay-off mode:0(Default)=>delay-off mode-1; 1=>delay-off mode-2
Positive power supply
Output Q active high or low selection, 0(Default)=>Active high; 1=>Active low
Selecting delay-off option pin, 1(Default)=>normal mode; 0=>delay-off mode Maximum on time or delay-off mode time selection, 11(Default)
MOTB MOTA Normal mode: Maximum on time Delay-off mode
11
Infinity
2se.