TTP224/TTP224N
TM
TonTouch
4 KEY TOUCH PAD DETECTOR IC
The TTP224/TTP224N 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.
GENERAL DESCRIPTION
FEATURES
Operating voltage 2.4V~5.5V
Built-in regulator with external enable/disable option Operating current, @VDD=3V no load At low power mode typical 2.5uA At fast mode typical 9.0uA @VDD=3V operating voltage :
The response time about 100mS at fast mode, 200mS at low power mode for TTP224 The response time about 60mS at fast mode, 160mS at low power mode for TTP224N Sensitivity can adjust by the capacitance(0~50pF) outside for each touch pad Provides Fast mode and Low Power mode selection by pad option(LPMB pin) Provides direct mode or toggle mode、CMOS output or open drain output、
active high or active low by pad option(TOG/OD/AHLB pin).
Provides 2 output pins TPQ0D, TPQ2D that have no diode protection, active low
Have the maximum on time 120sec/64sec/16sec/infinite by pad option(MOT1, MOT0 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, and the re-calibration period is about 4.0sec, when key has not be
touched. Wide consumer products Button key replacement
APPLICATION
2009/8/24 Page 1 of 11 Ver :2.0
Preliminary TTP224/TTP224NTMTonTouch BLOCK DIAGRAM TP0TP1TP2TP3DIS13LPMBMOT0MOT1REGENSensor oscillatorcircuitSensor & Referencedetecting circuitTPQ0TPQ1TPQ2TPQ3TPQ0DTPQ2DTiming counter &function optioncontrol circuitOutputmode&drivercircuitTouch detecting circuitSystem oscillatorcircuitKey-on & timingcontrolVREGRegulatorcircuitTOGAHLBODSMPAD DESCRIPTION Pad No. Pad Name Type Pad Description Touch pad input pin 1 TP0 I/O Touch pad input pin 2 TP1 I/O Touch pad input pin 3 TP2 I/O 4 TP3 I/O Touch pad input pin 5 AHLB I-PL Output active high or low option, default:0 6 VDD P Positive power supply 7 VREG P Internal regulator output pin 8 TOG I-PL Output type option, default:0 9 LPMB I-PL Low power/fast mode option, default:0 10 MOT1 I-PH Key maximum on time option, default:1 11 MOT0 I-PH 12 VSS P Negative power supply, ground 13 DIS13 I-PH Disable touch pad TP1, TP3 option, default:1 14 REGEN I-PH Internal regulator enable/disable function option, default:1 15 OD I-PH Output open-drain option, default:1 I-PH Single/multi key option, default:1 16 SM 17 TPQ3 O Direct output for TP3 touch input pin 18 TPQ2 O Direct output for TP2 touch input pin OD Open Drain output(have no Diode protective circuit), active low19 TPQ2D for TP2 touch input pin 20 TPQ1 O Direct output for TP1 touch input pin 21 TPQ0 O Direct output for TP0 touch input pin OD Open Drain output(have no Diode protective circuit), active low22 TPQ0D for TP0 touch input pin Note：Pin Type I ＝＞CMOS input only I-PH ＝＞CMOS input and pull-high resister O ＝＞CMOS push-pull output I-PL ＝＞CMOS input and pull-low resister I/O ＝＞CMOS I/O OD ＝＞Open drain output, have no Diode protective circuit P ＝＞Power / Ground 2009/8/24 Page 2 of 11 Ver :2.0 Preliminary
TTP224/TTP224N
TM
TonTouch
PAD’s DIAGRAM
CHIP SIZE : 1400um x 1290um
Substrate floating(recommend) or VSS
PAD’s COORDINATE
Pad NO. Pad Name 1 TP0 2 TP1 3 TP2 4 TP3 5 AHLB 6 VDD 7 VREG 8 TOG 9 LPMB 10 MOT1 11 MOT0 12 VSS 13 DIS13 14 REGEN 15 OD 16 SM 17 TPQ3 18 TPQ2 19 TPQ2D 20 TPQ1 21 TPQ0 22 TPQ0D X Y -104.05 545.00 -221.05 545.00 -600.00 342.70 -600.00 225.70 -600.00 108.70 -112.00 -545.00 5.00 -545.00 122.00 -545.00 239.00 -545.00 356.00 -545.00 473.00 -545.00 600.00 -338.70 600.00 -221.70 600.00 -104.70 600.00 12.30 600.00 129.30 600.00 246.30 600.00 363.30 363.95 545.00 246.95 545.00 129.95 545.00 12.95 545.00
2009/8/24 Page 3 of 11 Ver :2.0
Preliminary
TTP224/TTP224N
TM
TonTouch
RATING
ELECTRICAL CHARACTERISTICS ‧Absolute Maximum Ratings
Parameter Symbol Operating Temperature Top Storage Temperature TSTG Supply Voltage VDD Input Voltage VIN Human Body Mode ESD Note: VSS symbolizes for system ground
Conditions
─ ─ Ta=25°C Ta=25°C ─
Unit
-40℃ ~ +85℃ ℃ -50℃ ~ +125℃ ℃ VSS-0.3 ~VSS+6.0 V VSS -0.3 to VDD+0.3 V
5 KV ‧DC/AC Characteristics：(Test condition at room temperature=25℃)
Parameter SymbolTest ConditionOperating Voltage VDD Regulator disable (illdibl)Operating Voltage VDD Regulator enable Internal Regulator Output VREG Operating Current Iop1 VDD=3V (regulator enable) (4 keys, DIS13=1, no load) At low power mode
VDD=3V (regulator enable) At fast mode
Operating Current Iop2 VDD=3V (regulator enable) (2 keys, DIS13=0, no load) At low power mode
VDD=3V (regulator enable) At fast mode
Input Ports VIL Input Low Voltage Input Ports VIH Input High Voltage Output Port Sink Current Output Port Source Current Input Pin Pull-high Resistor Input Pin Pull-low Resistor Output Response Time
2009/8/24 Page 4 of 11 Ver :2.0
Min. Typ. Max.Unit2.0 5.5 V 2.4 - 5.5 V 2.2 2.3 2.4 V 2.5 uA 9 uA 2.0 uA 6.5 uA 0 0.8 - - 0.2 1.0 VDDVDDIOL IOH RPH RPL TR VDD=3V=, VOL0.6V - 8 - mAVDD=3V, V=OH2.4V VDD=3V, VDD=3V, VDD=3V, At fast mode VDD=3V, At low power mode- -4 - mA 30K ohm 25K ohm 100 200 mS mS Preliminary TTP224/TTP224NTMTonTouch 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 TTP224/TTP224N 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 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 (0≦Cs0~Cs3≦50pF). ELECTRODEK0Cs0TP0K1Cs1K2Cs2K3Cs3TP3AHLBTOGLPMBTP1TP2VDDTPQ0TPQ1TPQ2TPQ3TPQ0DTPQ2DVREGSMODREGENDIS13MOT0VSSMOT1VDD 2. Output mode(By TOG, OD, AHLB pad option) The TTP224/TTP224N outputs(TPQ0~TPQ3) has direct mode active high or low by AHLB pad option, has toggle mode by TOG pad option and has open drain(have diode protective circuit) mode by OD pad option. Another TPQ0D, TPQ2D are open drain active low output pins have no diode protective circuit. TOG OD AHLB0 0 0 0 1 1 1 1
1 1 0 0 1 1 0 0 0 1 0 1 0 1 0 1 Pad TPQ0~TPQ3 option features Direct mode, CMOS output active high output Direct mode, CMOS output active low output Direct mode, Open drain active high output Direct mode, Open drain active low output Toggle mode, COMS output, Power on state=0 Toggle mode, COMS output, Power on state=1 Toggle mode, Power on state high-Z, Active high Toggle mode, Power on state high-Z, Active low Remark Default 2009/8/24 Page 5 of 11 Ver :2.0
Preliminary TTP224/TTP224NTMTonTouch Remark Default TOG Pad TPQ0D,TPQ2D option features 0 1 Direct mode, Open drain active low output, Power on state high-Z Toggle mode, Open drain active low output, Power on state high-Z PTPQ0 - TPQ3EPTPQ0DTPQ2DENNENN 3. Key operating mode(By SM pad option) The TTP224/TTP224N has the Single-key and Multi-key functions by SM pad option. SM Option features Remark 1 Multi-key mode Default 0 Single key mode Multi-key mode : the TP0-TP3 can be detected 2 keys or above 2 keys at the same time. Single-key mode : the TP0-TP3 can be detected 1 key only at the same time, when any key be detected, the other 3 keys can not be detected. 4. Maximum key on duration time (By MOT0, MOT1 pad option) If some objects cover in the sense pad, and causing the change quantity enough to be detected. To prevent this, the TTP224/TTP224N sets a timer to monitor the detection. The timer is the maximum on duration time. When the detection is over the timer, the system will return to the power-on initial state, and the output becomes inactive until the next detection. MOT1 MOT0 0 0 1 1 0 1 0 1 Option features Maximum on time 120sec Maximum on time 64sec Maximum on time 16sec Infinite(Disable maximum on time) Remark Default 5. Fast and Low power mode selection (By LPMB pad option) The TTP224/TTP224N has Fast mode and Low Power mode to be selected. It depends on the state of LPMB pad. When the LPMB pin is connected to VDD, the TTP224/TTP224N runs in Fast mode. When the LPMB pin is opened or connected to VSS, the TTP224/TTP224N runs in Low Power mode. In the Fast mode response time is faster, but the current consumption will be increased. In the Low Power mode it will be saving power, but will be slowing response time for first touch. When it awaked in fast mode, the response time is the same the fast mode. In this mode when detecting key touch, it will switch to Fast mode. Until the key touch is released and will keep a time about 8sec. Then it returns to Low Power mode. The states and timing of two modes please see below figure. 2009/8/24 Page 6 of 11 Ver :2.0 Preliminary TTP224/TTP224NTMTonTouch For TTP224 timing diagram : LPMBVDDVSS~30msTPVDDVSSKEY TOUCHKEY RELEASETPQVDDVSSFast ModeLPMBVDDVSSLow Power mode timingFast modetimingLow Power mode timingFast modetimingLow Power mode timingTPVDDVSS~125ms~30msPOSSIBLE KEY TOUCHKEY RELEASE(NOT REALLY TOUCH)~125ms~30msKEY TOUCHABOUT 8SECKEY RELEASE~125msTPQVDDVSSLow Power ModeFor TTP224N timing diagram : LPMBVDDVSS~30ms TPVDDVSSKEY TOUCHKEY RELEASETPQVDDVSSFast ModeLPMBVDDVSSLow Power mode timingFast modetimingLow Power mode timingFast modetimingLow Power mode timingTPVDDVSS~125ms~30msPOSSIBLE KEY TOUCHKEY RELEASE(NOT REALLY TOUCH)~125ms~30msKEY TOUCHABOUT 8SECKEY RELEASE~125msTPQVDDVSSLow Power ModeLPMB Option features Remark 1 Fast mode 0 Low Power mode Default 6. Internal regulator enable/disable The TTP224/TTP224N built in regulator in the chip. The regulator can be set enable or disable by the REGEN pin. The REGEN pin is opened or connected to VDD, the regulator is enabled. The REGEN pin is connected to VSS, the regulator is disabled. When the internal regulator is disabled, the VREG pin must be connected to external VDD. REGEN Option features 1 0 Enable internal regulator Disable internal regulator Remark Default 2009/8/24 Page 7 of 11 Ver :2.0 Preliminary
TTP224/TTP224N
TM
TonTouch
7. Input keys number select(By DIS13 pad option) If use under 2 keys, the TTP224/TTP224N can disable TP1 and TP3 by DIS13 pad option for
saving power. When DIS13 connected to VSS, to touch TP1, TP3 ineffectively.
DIS13 Option features Remark 1 0
2009/8/24 Enable TP1, TP3 Disable TP1, TP3
Page 8 of 11 Default
Ver :2.0
Preliminary TTP224/TTP224NTMTonTouch APPLICATION CIRCUIT TCP224/TCP224N APPLICATION (enable internal regulator)K0Cs0K1Cs12TP1K2Cs2K3Cs3345TP2TP3AHLB1TP022TPQ0D21TPQ020TPQ119TPQ2DMOT110TPQ218TPQ317SM16TCP224/TCP224NOD15REGEN14DIS1313VREGVDD678911104C1MOT0LPMBVSS12TOG Option table:Output mode:TOGopenopenopenopenVDDVDDVDDVDDTOGopenVDDODopenopenVSSVSSopenopenVSSVSSAHLBopenVDDopenVDDopenVDDopenVDDPad TPQ0~TP3 option featuresDirect mode, CMOS active high outputDirect mode, CMOS active low outputDirect mode, Open drain active high outputDirect mode, Open drain active low outputToggle mode, COMS output, Power on state=0Toggle mode, COMS output, Power on state=1Toggle mode, Power on state high-Z, Active highToggle mode, Power on state high-Z, Active lowFast and Low power mode:Pad TPQ0D,TPQ2D (has no diode protection) option featuresDirect mode, Open drain active low output, Power on state high-ZToggle mode, Open drain active low output, Power on state high-ZLPMBVDDopenFast modeLow Power modeOption featuresKey operation mode:SMopenVSSOption featuresMulti-key modeSingle key modeMaximum key on duration time:MOT1MOT0VSSVSSopenopenVSSopenVSSopenOption featuresMaximum on time 120secMaximum on time 64secMaximum on time 16secInfinite(Disable maximum on time) Input keys number select:DIS13openVSSOption featuresEnable TP1, TP3Disable TP1, TP3PS：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 material of panel covering on the PCB can not include the metal or the electric element. The paints on the surfaces are the same. 3. 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 (TTP224/TTP224N). 4. The capacitance Cs0~Cs3 can be used to adjust the sensitivity. The value of Cs0~Cs3 use smaller, then the sensitivity will be better. The sensitivity adjustment must according to the practical application on PCB. The range of Cs0~Cs3 value are 0~50pF. 5. The sensitivity adjustment capacitors (Cs0~Cs3) 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. 2009/8/24 Page 9 of 11 Ver :2.0 Preliminary TCP224/TCP224N APPLICATION (disable internal regulator)K0Cs0K1Cs12TP1K2Cs2K3Cs3345TP2TP3AHLB1TP022TPQ0D21TPQ020TPQ119TPQ2DTPQ218TPQ317SM16TTP224/TTP224NTMTonTouch TCP224/TCP224NOD15REGEN14DIS1313VREGMOT110VDD678911104C1MOT0TOGLPMBVSS12 Option table:Output mode:TOGopenopenopenopenVDDVDDVDDVDDTOGopenVDDODopenopenVSSVSSopenopenVSSVSSAHLBopenVDDopenVDDopenVDDopenVDDPad TPQ0~TP3 option featuresDirect mode, CMOS active high outputDirect mode, CMOS active low outputDirect mode, Open drain active high outputDirect mode, Open drain active low outputToggle mode, COMS output, Power on state=0Toggle mode, COMS output, Power on state=1Toggle mode, Power on state high-Z, Active highToggle mode, Power on state high-Z, Active lowFast and Low power mode:Pad TPQ0D,TPQ2D (has no diode protection) option featuresDirect mode, Open drain active low output, Power on state high-ZToggle mode, Open drain active low output, Power on state high-ZLPMBVDDopenFast modeLow Power modeOption featuresKey operation mode:SMopenVSSOption featuresMulti-key modeSingle key modeMaximum key on duration time:MOT1MOT0VSSVSSopenopenVSSopenVSSopenOption featuresMaximum on time 120secMaximum on time 64secMaximum on time 16secInfinite(Disable maximum on time) Input keys number select:DIS13openVSSOption featuresEnable TP1, TP3Disable TP1, TP3PS：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 (TTP224/TTP224N). 5. The capacitance Cs0~Cs3 can be used to adjust the sensitivity. The value of Cs0~Cs3 use smaller, then the sensitivity will be better. The sensitivity adjustment must according to the practical application on PCB. The range of Cs0~Cs3 value are 0~50pF. 6. The sensitivity adjustment capacitors (Cs0~Cs3) 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. 2009/8/24 Page 10 of 11 Ver :2.0 Preliminary
TTP224/TTP224N
ORDER INFORMATION
For TTP224
a. Package form: TTP224-XXX b. Chip form: TCP224 c. Wafer base: TDP224
For TTP224N a. Package form: TTP224N-XXX b. Chip form: TCP224N c. Wafer base: TDP224-02
REVISE HISTORY
1. 2009/06/30 - Original version：V1.0 2. 2009/8/24 Î V2.0 Add the TTP224N
2009/8/24 Page 11 of 11 TonTouchTM
Ver :2.0
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