TTP223E-BA6

TTP223E-BA6 1 key Touch Pad Detector IC Outline z The TTP223E-BA6 TonTouchTM is a touch pad detector IC which offers 1 touch key. 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 2.0V ~ 5.5V z Operating current, @VDD=3V no load At low power mode typical 2.0uA, maximum 4.0uA z The response time max about 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 Low Power mode z Provides direct output or toggle output selection by pin option (TOG pin) z Q pin is CMOS output can be selected active high or active low by pin option (AHLB 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 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 2016/4/28 Page 1 of 8 Version：1.0 TTP223E-BA6 Block diagram I Sensor & Reference detecting circuit Sensor oscillator circuit Timing counter & function option control circuit Output mode & driver circuit Q Touch detecting circuit System oscillator circuit Key-on & timing control Regulator circuit TOG AHLB Pin Description Pin NO Pin Name Type 1 2 3 Q VSS I O P I/O 4 AHLB I-PL 5 VDD P 6 TOG I-PL Pin Description CMOS output pin Negative power supply, ground Input sensor port Output Q active high or low selection, 0(Default)=>Active high; 1=>Active low Positive power supply Output type option pin, 0(Default)=>Direct output; 1=>Toggle output Pin Type z I CMOS input only z I-PH CMOS input and pull-high resister z O CMOS push-pull output z I-PL z I／O CMOS z OD CMOS input and pull-low resister Open drain output, have no Diode protective circuit z P Power／Ground 2016/4/28 I／O Page 2 of 8 Version：1.0 TTP223E-BA6 Electrical Characteristics z Absolute maximum ratings Parameter Symbol Conditions Rating Unit Operating Temperature TOP ─ -40～+85 ℃ Storage Temperature TSTG ─ -50～+125 ℃ Supply Voltage VDD Ta=25°C VSS-0.3～VSS+5.5 V VIN Ta=25°C VSS-0.3～VDD+0.3 V ESD ─ 5 KV Input Voltage Human Body Mode Note：VSS symbolizes for system ground z DC / AC characteristics：（Test condition at room temperature = 25 ℃） Parameter Operating Voltage Symbol Test Condition VDD Min Typ Max Unit 2.0 3 5.5 V IOPL VDD=3V, At low power mode 2.0 4.0 uA IOPF VDD=3V, At fast mode 5.0 10.0 uA Input Ports VIL Input Low Voltage 0 0.2 VDD Input Ports VIH Input High Voltage 0.8 1.0 VDD Output Port Sink Current IOL VDD=3V, VOL=0.6V 8 mA Output Port Source Current IOH VDD=3V, VOH=2.4V -4 mA Input Pin Pull-low Resistor RPL 25K ohm Output Response Time TR Operating Current 2016/4/28 VDD=3V (TOG, AHLB) VDD=3V、 At fast mode VDD=3V、 At low power mode Page 3 of 8 60 mS 220 Version：1.0 TTP223E-BA6 Function Description 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 TTP223E-BA6 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 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 value of Cs will reduce sensitivity in the useful range （1≦Cs≦50pF）. VDD VDD ELECTRODE Q I Cs AHLB TOG VSS Ⅱ. Output mode（By TOG、AHLB pin option） TOG pin： Direct output or toggle output selection. AHLB pin： Output Q active high or active low selection. Pin Q（CMOS output）option features： TOG AHLB 0 0 Direct output, CMOS active high 0 1 Direct output, CMOS active low 1 0 Toggle output, power on state = 0 1 1 Toggle output, power on state = 1 2016/4/28 Pin Q option features Page 4 of 8 Version：1.0 TTP223E-BA6 Ⅲ. Low power mode The TTP223E-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 10 sec. Then it returns to Low Power mode. Low Power mode timing I Q Fast mode timing Low Power mode timing Fast mode timing Low Power mode timing VDD VSS ~125ms ~16ms POSSIBLE KEY TOUCH KEY RELEASE (NOT REALLY TOUCH) ~125ms ~16ms KEY TOUCH ABOUT 10 SEC ~125ms KEY RELEASE VDD VSS Low Power Mode Ⅳ. 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. 2016/4/28 Feature option pins Initial state by Power on AHLB 0 TOG 0 Page 5 of 8 Version：1.0 TTP223E-BA6 Application circuit VDD Q 1Q TOG 6 2 VSS VDD 5 3I KEY AHLB 4 104 Cs C1 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 (TTP223E-BA6). 5. 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 are 1~50pF. 6. 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. 2016/4/28 Page 6 of 8 Version：1.0 TTP223E-BA6 Package outline Package Type: SOT23-6L 2016/4/28 Page 7 of 8 Version：1.0 TTP223E-BA6 Package configuration TTP223E-BA6 AHLB 4 VDD 5 6 TOG Package Type SOT23-6L 223EB Lot No. 2 3 VSS I Q 1 (Latter 4 digit) Ordering Information TTP223E-BA6 Package Type Chip Type Wafer Type TTP223E-BA6 No support No support REVISE HISTORY 1. 2016/04/28 - Original version：V1.0 2016/4/28 Page 8 of 8 Version：1.0