preliminary ttp223-ba6 TTP223N-BA6 tontouch tm 09?/11/30 page 1 of 8 ver : 2.1 1 key touch pad detector ic general description the ttp223-ba6/TTP223N-BA6 tontouch tm is a touch pad detector ic which offers 1 touch key. the touching detection ic is de signed for replacing traditional di rect button key with diverse pad size. low power consumption and wide operating volta ge are the contact key features for dc or ac application. features ? operating voltage 2.0v~5.5v ? operating current @vdd=3v, no load ? at low power mode typical 1.5ua, maximum 3.0ua ? the response time max 220ms at low power mode @vdd=3v ? sensitivity can adjust by the capacitance(0~50pf) outside ? stable touching detection of human body fo r replacing traditional direct switch key ? provides low power mode ? provides direct mode toggle mode by pad option(tog pin) q pin is cmos output ? all output modes can be selected active high or active low by pad option(ahlb pin) ? after power-on have about 0.5sec stable-time, during the time do not touch the key pad, and the function is disabled ? auto calibration for life at low power mode the re-calibra tion period is about 4.0sec normally, when key detected touch and released touch, the auto re-calibration will be redoing after about 16sec from releasing key ? the sensitivity of TTP223N-BA6 is better than ttp223-ba6?s. but the stability of ttp223n-b a6 is worse than ttp223-ba6?s. application ? wide consumer products ? button key replacement free datasheet http:///
preliminary ttp223-ba6 TTP223N-BA6 tontouch tm 09?/11/30 page 2 of 8 ver : 2.1 block diagram q ahlb tog control key-on & timing circuit driver & mode output circuit touch detecting circuit system oscillator timing counter sensor oscillator circuit detecting circuit reference sensor & i package list package type sot-23-6l ttp223-ba6 and TTP223N-BA6 package configuration 223nb TTP223N-BA6 ttp223-ba6 (latter 4 digit) lot no. tog vdd ahlb i vss q 6 5 4 3 2 1 (latter 4 digit) lot no. 223b tog vdd ahlb i vss q 6 5 4 3 2 1 pad description pad no. pad name i/o type pad description 1 q o cmos output pin 2 vss p negative power supply, ground 3 i i/o input sensor port 4 ahlb i-pl output active high or low selection, 1=>active low; 0(default)=>active high 5 vdd p positive power supply 6 tog i-pl output type option pin, 1=>toggle mode; 0(default)=>direct mode pin type i cmos input only o cmos push-pull output i/o cmos i/o i-pl cmos input and pull-low resister p power / ground free datasheet http:///
preliminary ttp223-ba6 TTP223N-BA6 tontouch tm 09?/11/30 page 3 of 8 ver : 2.1 electrical characteristics ? absolute maximum ratings ? dc/ac characteristics (test condition at room temperature=25 ) parameter symbol conditions value unit operating temperature t op -40 ~ +85 storage temperature t stg -50 ~ +125 power supply voltage vdd ta=25 c vss-0.3 ~ vss+5.5 v input voltage v in ta=25 c vss-0.3 ~ vdd+0.3 v human body mode esd 4 kv note vss symbolizes for system ground parameter symbol test condition min. typ. max. unit operating voltage vdd 2.0 3 5.5 v f fast - 512k - system oscillator f low vdd=3v 16k hz sensor oscillator f sen vdd=3v no load - 1m - hz operating current i op vdd=3v at low power mode and output no load - 1.5 3.0 ua input ports v il input low voltage 0 - 0.2 vdd input ports v ih input high voltage 0.8 - 1.0 vdd output port sink current i ol vdd=3v, v ol =0.6v - 8 - ma output port source current i oh vdd=3v, v oh =2.4v - -4 - ma vdd=3v, at fast mode 60 output response time t r vdd=3v, at low power mode 220 ms input pin pull-low resistor r pl vdd=3v, (tog, ahlb) 28k ohm free datasheet http:///
preliminary ttp223-ba6 TTP223N-BA6 tontouch tm 09?/11/30 page 4 of 8 ver : 2.1 function description 1. 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 ttp223-ba6/TTP223N-BA6 offers some methods for adjusting the sensitivity outside. 1-1 by the electrode size under other conditions are fixed. using a larger elect rode size can increase sensitivity. otherwise it can decrease sensitivity. but the electrode size must use in the effective scope. 1-2 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. 1-3 by the value of cs (please see the down figure) under other conditions are fixed. when do not use the cs to vss, the sensitivity is most sensitive. when adding the values of cs will reduce sensitivity in the useful range (0 Q cs Q 50pf). 6 5 4 31 2 q tog ahlb vss i vdd electrode cs vdd 2. output mode the ttp223-ba6/TTP223N-BA6 has direct mode active high or low by ahlb pad option. and has toggle mode by tog pad option. pad q is cmos output. tog ahlb pad q option features 0 0 direct mode, cmos active high output 0 1 direct mode, cmos active low output 1 0 toggle mode, power on state=0 1 1 toggle mode, power on state=1 free datasheet http:///
preliminary ttp223-ba6 TTP223N-BA6 tontouch tm 09?/11/30 page 5 of 8 ver : 2.1 3. low power mode the ttp223-ba6/TTP223N-BA6 is low power mode. it will be saving power. when detecting key touch, it will switch to fast mode. until the ke y touch is released and will keep a time about 12sec. then it returns to low power mode. the states and timing please see below figure. ~160ms about 12sec ~20ms ~160ms ~20ms ~160ms (not really touch) key release possible key touch key release timing fast mode key touch low power mode timing low power mode timing timing fast mode vss vdd low power mode q low power mode timing vss vdd i 4. option pin for power saving concern and package bonding opti on consideration, all the feature option pins with latch type design and initial states are 0 or 1 as power on. if those pi ns are forced to vdd or vss, the states will be changed to 1 or 0 wit hout any current leakage to conflict the power saving issue. feature option pins initial state by power on ahlb 0 tog 0 free datasheet http:///
preliminary ttp223-ba6 TTP223N-BA6 tontouch tm 09?/11/30 page 6 of 8 ver : 2.1 application circuit TTP223N-BA6 sot-23-6l ttp223-ba6 sot-23-6l 104 c1 sense pad cs tog 6 vdd 5 ahlb 4 1 q 2 vss 3 i vss vout vin voltage regulator +2.0 ~ +5.5v see p.s. : 6 4.7uf co 4.7uf ci vcc ps 1. on pcb, the length of lines from t ouch pad to ic pin shorter is better. and the lines do not pa rallel and cross w ith other lines. 2. the power supply must be stable. if th e supply voltage drift or sh ift 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 capacitance cs can be used to adjust the sensitivity. the value of cs use smaller, then the sensitivity will be better. the sensitivit y adjustment must according to the practical application on pcb. the range of cs value is 0~50pf. 5. the c1 capacitor must be used between vdd and vss; and should be routed with very short tracks to the device?s vdd and vs s pins (ttp223-ba6/TTP223N-BA6). 6. the value of capacitors can be used by the real application for ci and co capacitors. 7. the sensitivity adjustment capacitors (cs) must use smaller temperature coefficient and more stable capacitors. such are x7r, npo for exam ple. so for touch application, recommend to use npo capacitor, for reducing that the temperature varies to affect sensitivity. free datasheet http:///
preliminary ttp223-ba6 TTP223N-BA6 tontouch tm 09?/11/30 page 7 of 8 ver : 2.1 package type: sot-23-6l package outline dimension free datasheet http:///
preliminary ttp223-ba6 TTP223N-BA6 tontouch tm 09?/11/30 page 8 of 8 ver : 2.1 order information a. package form: ttp223-ba6 TTP223N-BA6 revise history 1. 2008/08/15 -original version v1.0 2. 2009/08/31 => v_2.0 -add the TTP223N-BA6. -add the trademark tontouch tm to every page. 3. 2009/11/30 => v_2.1 - o n the page-3 c hange the operating temperature => -40 ~ +85 . free datasheet http:///
|
