TS01S 1-Ch Differential Sensitivity Calibration Capacitive Touch Sensor SPECIFICATION V2.4 February 2008 ADSemiconductor® TS01S (1-CH Differential Sensitivity Calibration Capacitive Touch Sensor) 1 Specification 1.1 General features 1-Channel capacitive touch sensor with differential sensitivity calibration Low power consumption Uniformly adjustable sensitivity Sync function for parallel operation Three steps sensitivity available without external component Open-drain digital output Internal power on reset Embedded common and normal noise elimination circuit RoHS compliant SOT-26 package 1.2 Application Home appliance Mobile application (PMP, Navigation, MP3 etc) Membrane switch replacement Human interface for toys & interactive games Sealed control panels, keypads 1.3 Package (SOT-26) TS01S SOT-26 (Drawings not to scale) ADSemiconductor Confidential 1 / 12 ADSemiconductor® TS01S (1-CH Differential Sensitivity Calibration Capacitive Touch Sensor) 2 Pin Description (SOT-26) PIN Number 1 2 Name OUTPUT VDD I/O Digital Output Power Description Touch detect output Power (2.5V ~ 5.0V) Self operation signal output Analog Peripheral operation signal input 3 SYNC Input/Output Sensitivity selection input [Note1] 4 CS Analog Input Capacitive sensor input 5 GND Ground Supply ground Reference capacitive sensor input 6 CR Analog Input for differential sensitivity calibration Note1 : Refer to chapter 6.3, 6.4 SYNC implementation Protection VDD/GND GND VDD/GND VDD/GND VDD VDD/GND 3 Absolute Maximum Rating Supply voltage Maximum voltage on any pin Maximum current on any PAD Continuous power Dissipation Storage Temperature Operating Temperature Junction Temperature Note2 : Unless any other command is 5.5 V VDD+0.3 V 100mA 200mW -50 ~ 150℃ -20 ~ 75℃ 150℃ noted, all above are operated in normal temperature. 4 ESD & Latch-up Characteristics 4.1 4.2 ESD characteristics Mode Polarity H.B.M Pos / Neg M.M Pos / Neg C.D.M Pos / Neg Minimum Level 8000V 8000V 8000V 500V 500V 500V 800V Reference VDD VSS P to P VDD VSS P to P DIRECT Minimum Level 25mA ~ 100mA -25mA ~ -100mA 1V ~ 7.5V Test Step Latch-up characteristics Mode I Test V supply over 5.0V Polarity Positive Negative Positive 25mA 0.5V ADSemiconductor Confidential 2 / 12 ADSemiconductor® TS01S (1-CH Differential Sensitivity Calibration Capacitive Touch Sensor) 5 Electrical Characteristics ▪ VDD=3.3V (Unless otherwise noted), TA = 25℃ Characteristics Symbol Operating supply voltage VDD Current consumption IDD Output maximum sink current Internal reset criterion VDD voltage Sense input capacitance range Test Condition Min Typ Max Units 2.5 3.3 5.0 V VDD= 3.3V - 25 40 VDD= 5.0V - 40 70 IOUT TA = 25℃ - - 4.0 ㎃ VDD_RST TA = 25℃ - - 0.3∙VDD V - 10 100 CS [Note3] Reference input capacitance range ㎂ ㎊ CR - 12 100 RS - 200 1000 Ω 0.2 - - ㎊ ΔCS > 0.2pF - 12 - ΔCS < 0.2pF - 30M - TCAL - 200 - ms TR_VDD - - 100 ms RSYNC 1 2 20 MΩ [Note4] Sense input resistance range Minimum detectable capacitance variation Output impedance (open drain) Self calibration time after VDD setting Maximum supply voltage rising time Recommended sync resistance range ΔCS Zo CS = 10pF Ω Note 3: The sensitivity can be increased with lower CS value. The recommended value of CS is 10pF when using 3T PC(Poly Carbonate) cover and 10 ㎜ x 7 ㎜ touch pattern and middle sensitivity selection. Note 4: CR value is recommended as same that of CS_TOT as possible for effective differential sensitivity calibration. CS_TOT = CS + CPARA (CPARA is parasitic capacitance of CS pin) If proper CR capacitor value is used, CR pin has almost same frequency as that of CS pin. ADSemiconductor Confidential 3 / 12 ADSemiconductor® TS01S (1-CH Differential Sensitivity Calibration Capacitive Touch Sensor) 6 TS01S Implementation 6.1 Current consumption TS01S uses internal bias circuit, so internal clock frequency and current consumption is not adjusted. The typical current consumption curve of TS01S is represented in accordance with VDD voltage as below. The higher VDD requires more current consumption. Internal bias circuit can make the circuit design simple and reduce external components. IDD [uA] 45 40 35 30 25 20 15 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VDD [V] Typical current consumption curve of TS01S ADSemiconductor Confidential 4 / 12 ADSemiconductor® TS01S (1-CH Differential Sensitivity Calibration Capacitive Touch Sensor) 6.2 CS and CR implementation RS CS << Touch PAD CS CR << CR The parallel capacitor CS is added to CS and CR to CR to adjust fine sensitivity. The major factor of the sensitivity is CS. The sensitivity would be increased when smaller CS value is used. (Ref. below Sensitivity Example Figure) The CR value should be almost the same as the total CS capacitance (CS_TOT) for effective differential sensitivity calibration. The total CS capacitance is composed of CS which is set for optimal sensitivity and parasitic capacitance of CS pattern (CPARA). The parasitic capacitance of CS pattern is about 2pF if normal touch pattern size is used. But in the case of using larger touch pattern, CPARA is bigger than normal value. The RS is serial connection resistor to avoid malfunction from external surge and ESD. (It might be optional.) From 200Ω to 1kΩ is recommended for RS. The size and shape of touch PAD might have influence on the sensitivity. The sensitivity will be optimal when the size of PAD is approximately an half of the first knuckle (it’s about 10 ㎜ｘ 7 ㎜). The connection line of CS to the touch PAD is recommended to be routed as short as possible to prevent from abnormal touch detection caused by connection line. Sensitivity example figure of TS01S (when normal sensitivity selection selected) ADSemiconductor Confidential 5 / 12 ADSemiconductor® TS01S (1-CH Differential Sensitivity Calibration Capacitive Touch Sensor) 6.3 SYNC implementation SYNC << 1st TS01S RSYNC SYNC << 2nd TS01S or TS** From two TS01S to ten TS01S (or other TS series touch sensor) can work on the one application at the same time thanks to SYNC function with this pin. The SYNC pulse prevents over two sensing signal from interfering with each other. During the sense disenable period and SYNC input becomes high, internal clock is suspended. The RSYNC is pull-down resistor of SYNC pin. Too big value of RSYNC makes the SYNC pulse falling delay, and too small value of R SYNC makes rising delay. The typical value of RSYNC is 2MΩ. TS01S has high sensitivity when SYNC is implemented as above figure (connect RSYNC between SYNC and GND). 6.4 SYNC implementation for sensitivity selection. SYNC << VDD SYNC << Sync connection for middle sensitivity Sync connection for low sensitivity Another function of SYNC pin of TS01S is the selection of sensitivity without any additional external component. The SYNC implementation for sensitivity selection is informed as below chart. SYNC Connection Using RSYNC Connection Connected to VDD Connected to GND Sensitivity High Middle Low ADSemiconductor Confidential 6 / 12 ADSemiconductor® TS01S (1-CH Differential Sensitivity Calibration Capacitive Touch Sensor) 6.5 OUTPUT implementation VDD ROUT OUT >> OUTPUT The OUT is an open drain structure. For this reason, the connection of pull-up resistor ROUT is required between OUT and VDD or another lower voltage node. When ROUT is connected to higher voltage node than VDD, the output current passes through protection diode to VDD and abnormal operation may be occurred. The maximum output sink current is 4mA, so over a few kΩ must be used as ROUT. Normally 10kΩ is used as ROUT. The OUT is high in normal situation, and the value is low when a touch is detected on CS. 6.6 Internal reset operation The TS01S has stable internal reset circuit that offers reset pulse to digital block. The supply voltage for a system start or restart should be under 0.3∙VDD of normal operation VDD. No external components required for TS01S power reset, thus it helps simple circuit design and minimize the cost of application. ☞ CAUTION: The VDD rising time should be less then 100ms for proper power on reset. ADSemiconductor Confidential 7 / 12 ADSemiconductor® TS01S (1-CH Differential Sensitivity Calibration Capacitive Touch Sensor) 7 Recommended Circuit Diagram 7.1 Apllication Example The capacitor and resistor might be connected with CS (pin4) for getting a stable sensitivity. The capacitor value which is connected to CR pin (CR) should be almost the same as the total CS capacitance (include parasitic capacitance) for an effective differential sensitivity calibration. TS01S is reset by internal reset circuit. VDD voltage rising time should be shorter than 100msec for proper operation. The sensitivity can be adjusted through a connection of SYNC pin. (Refer to chapter 6.4) From two TS01S to ten TS01S (or other TS series touch sensor) can work on the one application at the same time thanks to SYNC function. (Refer to chapter 6.3) TS01S OUT port has an open drain structure. The pull-up resistor should therefore be needed as above figure. VDD periodic voltage ripples over 50mV or the ripple frequency which is lower than 10 kHz it can cause wrong sensitivity calibration. To prevent above problem, power (VDD, GND) line of touch circuit should be separated from the other circuit. Especially the LED driver power line or digital switching circuit power line should be certainly treated to be separated from touch circuit. The CS pattern should be routed as short as possible and the width of the line should be around 0.25mm. The CS pattern routing should be formed by bottom metal (opposite metal of touch PAD). The capacitor which is between VDD and GND is an obligation. It should be placed as close as possible from TS01S. The empty space of PCB must be filled with GND pattern to strengthen GND pattern and to prevent external noise that causes interference with the sensing frequency. ADSemiconductor Confidential 8 / 12 ADSemiconductor® TS01S (1-CH Differential Sensitivity Calibration Capacitive Touch Sensor) 7.2 Example - Power Line Split Strategy A. Not split power line (Bad power line design) The noise that is generated by AC load or relay can be loaded at VDD power line. A big inductance might be appeared in case of the connection line between main board and display board is too long, moreover the voltage ripple could be generated by LED (LCD) display driver at VDD. B. Split power line (One 5V regulator used) – Recommended C. Split power line (Separated 5V regulator used) – Strongly recommended ADSemiconductor Confidential 9 / 12 ADSemiconductor® TS01S (1-CH Differential Sensitivity Calibration Capacitive Touch Sensor) 8 PACKAGE DESCRIPTION 8.1 Mechanical Drawing ADSemiconductor Confidential 10 / 12 ADSemiconductor® TS01S (1-CH Differential Sensitivity Calibration Capacitive Touch Sensor) NOTE: 1. Dimensions and tolerances are as per ANSI Y14.5, 1982. 2. Package surface to be matte finish VDI 11 ~ 13. 3. Die is facing up for mold. Die is facing down for trim/form, ie. Reverse trim/form. 4. The footlength measuring is based on the gauge plane method. 5. Dimension is exclusive of mold flash and gate burr. 6. Dimension is exclusive of solder plating. 7. All dimensions are mm. 8.2 Marking Description S Y WW Week Code Year Code Touch Switch Group Year Code P R S T U V W X Y Z Production Year 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 ADSemiconductor Confidential 11 / 12 ADSemiconductor® TS01S (1-CH Differential Sensitivity Calibration Capacitive Touch Sensor) NOTES: LIFE SUPPORT POLICY AD SEMICONDUCTOR’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF AD SEMICONDUCTOR CORPORATION The ADS logo is a registered trademark of ADSemiconductor ⓒ 2006 ADSemiconductor – All Rights Reserved www.adsemicon.com www.adsemicon.co.kr ADSemiconductor Confidential 12 / 12