TTP223-BA6

Preliminary TTP223-BA6 TTP223N-BA6 TonTouchTM 1 KEY TOUCH PAD DETECTOR IC GENERAL DESCRIPTION The TTP223-BA6/TTP223N-BA6 TonTouchTM is a touch pad detector IC which offers 1 touch key. 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. FEATURES ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ 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 for 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-calibration 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-BA6 is worse than TTP223-BA6’s. APPLICATION ƒ ƒ 09’/11/30 Wide consumer products Button key replacement Page 1 of 8 Ver : 2.1 TTP223-BA6 TTP223N-BA6 TonTouchTM Preliminary BLOCK DIAGRAM I Sensor oscillator circuit Sensor & Reference detecting circuit Timing counter Touch detecting circuit System oscillator circuit Key-on & timing control Q Output mode & driver circuit TOG AHLB PACKAGE LIST Package Type SOT-23-6L TTP223-BA6 and TTP223N-BA6 PACKAGE CONFIGURATION AHLB 4 TOG 6 VDD AHLB 4 5 VDD TTP223N-BA6 5 6 TOG TTP223-BA6 223B 223NB Lot No. Lot No. 2 3 VSS I 3 I 1 2 VSS (Latter 4 digit) Q 1 Q (Latter 4 digit) PAD DESCRIPTION Pad No. Pad Name I/O Type 1 2 3 4 Q VSS I AHLB O P I/O I-PL 5 6 VDD TOG P I-PL Pin Type I O I/O I-PL P 09’/11/30 Pad Description CMOS output pin Negative power supply, ground Input sensor port Output active high or low selection, 1=>Active low; 0(Default)=>Active high Positive power supply Output type option pin, 1=>Toggle mode; 0(Default)=>Direct mode CMOS input only CMOS push-pull output CMOS I/O CMOS input and pull-low resister Power / Ground Page 2 of 8 Ver : 2.1 TTP223-BA6 TTP223N-BA6 TonTouchTM Preliminary ELECTRICAL CHARACTERISTICS ‧Absolute Maximum Ratings Parameter Symbol Operating Temperature TOP Storage Temperature TSTG Power Supply Voltage VDD Input Voltage VIN Human Body Mode ESD Note：VSS symbolizes for system ground Conditions ─ ─ Ta=25°C Ta=25°C ─ Value -40 ~ +85 -50 ~ +125 VSS-0.3 ~ VSS+5.5 VSS-0.3 ~ VDD+0.3 4 Unit ℃ ℃ V V KV ‧DC/AC Characteristics：(Test condition at room temperature=25℃) Parameter Operating Voltage System oscillator Sensor oscillator Operating Current Input Ports Symbol VDD FFAST FLOW FSEN IOP Output Response Time VIL VIH IOL IOH TR Input Pin Pull-low Resistor RPL Input Ports Output Port Sink Current Output Port Source Current 09’/11/30 Test Condition VDD=3V VDD=3V no load VDD=3V at low power mode and output no load Input Low Voltage Input High Voltage VDD=3V, VOL=0.6V VDD=3V, VOH=2.4V VDD=3V, At fast mode VDD=3V, At low power mode VDD=3V, (TOG, AHLB) Page 3 of 8 Min. Typ. Max. Unit 2.0 3 5.5 V - 512K Hz 16K 1M Hz 1.5 3.0 uA 0 0.8 - 8 -4 28K 0.2 VDD 1.0 VDD mA mA 60 mS 220 ohm Ver : 2.1 TTP223-BA6 TTP223N-BA6 TonTouchTM Preliminary 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 electrode 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≦Cs≦50pF). VDD 5 ELECTRODE VDD 3 Q 1 TOG AHLB 6 I Cs 4 VSS 2 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 0 0 0 1 1 0 1 1 09’/11/30 Pad Q option features Direct mode, CMOS active high output Direct mode, CMOS active low output Toggle mode, Power on state=0 Toggle mode, Power on state=1 Page 4 of 8 Ver : 2.1 TTP223-BA6 TTP223N-BA6 TonTouchTM Preliminary 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 key 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. Low Power mode timing I Q Fast mode timing Low Power mode timing Fast mode timing Low Power mode timing VDD VSS ~160ms ~20ms ~160ms POSSIBLE KEY TOUCH KEY RELEASE (NOT REALLY TOUCH) ~20ms KEY TOUCH ABOUT 12SEC ~160ms KEY RELEASE VDD VSS Low Power Mode 4. Option pin For power saving concern and package bonding option consideration, all the feature option pins with latch type design and initial states are 0 or 1 as power on. If those pins are forced to VDD or VSS, the states will be changed to 1 or 0 without any current leakage to conflict the power saving issue. 09’/11/30 Feature option pins Initial state by Power on AHLB TOG 0 0 Page 5 of 8 Ver : 2.1 TTP223-BA6 TTP223N-BA6 TonTouchTM Preliminary APPLICATION CIRCUIT VCC +2.0 ~ +5.5V Voltage Regulator Vin Ci 4.7uF Vout VSS Co 4.7uF See P.S. : 6 TTP223N-BA6 SOT-23-6L TTP223-BA6 SOT-23-6L 1Q TOG 6 2 VSS VDD 5 3I Sense Pad AHLB 4 104 Cs C1 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 capacitance Cs can be used to adjust the sensitivity. The value of Cs use smaller, then the sensitivity will be better. The sensitivity 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 VSS 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 example. So for touch application, recommend to use NPO capacitor, for reducing that the temperature varies to affect sensitivity. 09’/11/30 Page 6 of 8 Ver : 2.1 Preliminary TTP223-BA6 TTP223N-BA6 TonTouchTM Package Type: SOT-23-6L Package Outline Dimension 09’/11/30 Page 7 of 8 Ver : 2.1 Preliminary TTP223-BA6 TTP223N-BA6 TonTouchTM 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 〝 TonTouchTM 〞to every page. 3. 2009/11/30 => V_2.1 - On the page-3 change the Operating Temperature => -40 ~ +85℃. 09’/11/30 Page 8 of 8 Ver : 2.1