TS08P 8-Channel Self Calibration Capacitive Touch Sensor SPECIFICATION V1.4 July 2008 Confidential ADSemiconductor ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 1 Specification 1.1 General Feature 8-Channel capacitive sensor with auto sensitivity calibration Selectable output operation mode (single output /multi output / dual single output) Selectable output level (active high / active low / analog voltage output) Uniformly adjustable 9 step sensitivity 3 Step internal calibration speed selections Sync function for parallel operation 5 SYNC pins for various option selections Almost no external component needed Open-drain digital output Low current consumption Embedded common and normal noise elimination circuit RoHS compliant 24QSOP and 24QFN package 1.2 Application Home application Membrane switch replacement Sealed control panels, keypads Door key-lock matrix application Touch screen replacement application 1.3 Package (24QSOP/24QFN) TS08P(24QSOP) TS08P-Q(24QFN) ※ Drawings not to scale ADSemiconductor Confidential 1 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 2 Pin Description 2.1 TS08P-Q(24QFN package) Pin Number 1 Name I/O CS4 Analog Input Digital Input /Output Analog Input Analog Input Analog Input Analog Input Digital Input /Output 2 SYNC1 3 4 5 6 CS5 CS6 CS7 CS8 7 SYNC2 8 9 DUMMY VSS 10 SYNC4 11 SYNC5 12 OUT1 13 14 15 16 17 18 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 19 OUT8 20 SYNC3 21 22 23 24 : : Note 3 : Note 4 : Note 5 : Note 1 Note 2 Ground Digital Input /Output Digital Input /Output Digital Output /Analog Output Digital Output Digital Output Digital Output Digital Output Digital Output Digital Output Digital Output /Analog Output Digital Input /Output Description Protection CH4 capacitive sensor input Sensitivity selection input 1 (Note 1) Sync pulse input /output 1 CH5 capacitive sensor input CH6 capacitive sensor input CH7 capacitive sensor input CH8 capacitive sensor input Sensitivity selection input 2 (Note 1) Sync pulse input /output 2 VDD/GND No Connection (Note 2) VDD/GND Supply ground Output level selection input (Note 3) Sync pulse input /output 4 Internal calibration speed selection input (Note 4) Sync pulse input /output 5 CH1 parallel output (Open drain) Ch1, 2, 3, 4 analog output CH2 parallel output (Open drain) CH3 parallel output (Open drain) CH4 parallel output (Open drain) CH5 parallel output (Open drain) CH6 parallel output (Open drain) CH7 parallel output (Open drain) CH8 parallel output (Open drain) Ch5, 6, 7, 9 analog output Output mode selection input (Note 5) Sync pulse input /output 3 VDD Power Power (2.5V~5.0V) CS1 Analog Input CH1 capacitive sensor input CS2 Analog Input CH2 capacitive sensor input CS3 Analog Input CH3 capacitive sensor input Refer to 6.3.2 Sensitivity selections. DUMMY pin should be no connection. Refer to 6.3.4 Output level selections. Refer to 6.3.5 Internal calibration speed selections. Refer to 6.3.3 Output mode selections. ADSemiconductor Confidential VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND GND VDD/GND VDD/GND VDD/GND 2 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 2.2 TS08P(24QSOP package) Pin Number 1 2 3 Name I/O CS6 CS7 CS8 Analog Input Analog Input Analog Input Digital Input /Output 4 SYNC2 5 6 DUMMY VSS 7 SYNC4 8 SYNC5 9 OUT1 10 11 12 13 14 15 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 16 OUT8 17 SYNC3 18 19 20 21 22 VDD CS1 CS2 CS3 CS4 23 SYNC1 24 CS5 : : Note 3 : Note 4 : Note 5 : Note 1 Note 2 Refer to DUMMY Refer to Refer to Refer to Ground Digital Input /Output Digital Input /Output Digital Output /Analog Output Digital Output Digital Output Digital Output Digital Output Digital Output Digital Output Digital Output /Analog Output Digital Input /Output Power Analog Input Analog Input Analog Input Analog Input Digital Input /Output Analog Input Description Protection CH6 capacitive sensor input CH7 capacitive sensor input CH8 capacitive sensor input Sensitivity selection input 2 (Note 1) Sync pulse input /output 2 VDD/GND VDD/GND VDD/GND No Connection (Note 2) VDD/GND Supply ground Output level selection input (Note 3) Sync pulse input /output 4 Internal calibration speed selection input (Note 4) Sync pulse input /output 5 CH1 parallel output (Open drain) Ch1, 2, 3, 4 analog output CH2 parallel output (Open drain) CH3 parallel output (Open drain) CH4 parallel output (Open drain) CH5 parallel output (Open drain) CH6 parallel output (Open drain) CH7 parallel output (Open drain) CH8 parallel output (Open drain) Ch5, 6, 7, 9 analog output Output mode selection input (Note 5) Sync pulse input /output 3 Power (2.5V~5.0V) CH1 capacitive sensor input CH2 capacitive sensor input CH3 capacitive sensor input CH4 capacitive sensor input Sensitivity selection input 1 (Note 1) Sync pulse input /output 1 CH5 capacitive sensor input VDD/GND VDD VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND VDD/GND 6.3.2 Sensitivity selections. pin should be no connection. 6.3.4 Output level selections. 6.3.5 Internal calibration speed selections. 6.3.3 Output mode selections. ADSemiconductor Confidential 3 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 3 Absolute Maximum Rating Battery supply voltage 5.5V Maximum voltage on any pin VDD+0.3 Maximum current on any PAD 100mA Power Dissipation 800mW Storage Temperature -50 ~ 150℃ Operating Temperature -20 ~ 75℃ Junction Temperature 150℃ Note 6: Unless any other command is noted, all above are operated in normal temperature. 4 ESD & Latch-up Characteristics 4.1 ESD Characteristics Mode H.B.M M.M Polarity Pos / Neg Pos / Neg Max Reference 8000V VDD 8000V VSS 8000V P to P 500V VDD 500V VSS 500V P to P 500V C.D.M Pos / Neg DIRECT 800V 4.2 Latch-up Characteristics Mode Polarity Max Positive 200mA Negative -200mA Positive 8.0V I Test V supply over 5.0V Test Step 25mA 1.0V ADSemiconductor Confidential 4 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 5 Electrical Characteristics (Preliminary) ▪ VDD=3.3V, (Unless otherwise noted), TA = 25℃ Characteristics Symbol Operating supply voltage VDD Test Condition VDD= 3.3V Current consumption IDD VDD= 5.0V Internal reset criterion VDD voltage Output maximum sink current Minimum detective capacitance difference Output impedance (open drain) Self calibration time after system reset Min Typ Max Units 2.5 3.3 5.0 V Slow calibration speed - 60 100 Normal calibration speed - 90 140 Fast calibration speed - 130 210 Slow calibration speed - 80 130 Normal calibration speed - 110 180 Fast calibration speed - 170 250 ㎂ VDD_RST TA = 25℃ - - 0.3∙VDD V IOUT TA = 25℃ - - 4.0 ㎃ 0.1 - - ㎊ ΔC > ΔCMIN - 12 - ΔC < ΔCMIN - 30M - Slow calibration speed - 100 - Normal calibration speed - 80 - Fast calibration speed - 60 - ΔCMIN Zo TCAL Ω ms Note 7: The sensitivity can be decreased with higher parallel capacitance of CS pin including parasitic capacitance made by neighbor GND or other pattern. Note 8: The series resistor(under 1kΩ) of CS can be used in noisy condition to avoid malfunction from external surge and ESD. ADSemiconductor Confidential 5 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 6 TS08P Implementation 6.1 Typical current consumption TS08P uses internal bias circuit, so internal clock frequency and current consumption is fixed and no external bias circuit is needed. TS08P has three step optional calibrations speed. Faster calibration speed needs more current consumption than slower calibration speed. The typical current consumption curve of TS08P is represented in accordance with VDD voltage as below. Internal bias circuit can make the circuit design simple and reduce external components. IDD [uA] 180 160 140 120 100 80 60 Fast Normal 40 Slow 20 0 2.0 2.5 3.0 3.5 VDD [V] 4.0 4.5 5.0 5.5 Typical current consumption curve of TS08P ADSemiconductor Confidential 6 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 6.2 CS implementation TS08P has 9 step selections of sensitivity and internal protection circuit so external components of CS pins such as series resistor or parallel capacitor isn’t necessary. The parallel parasitic capacitance of CS pins caused by touch line, touch pad and neighbor GND or other pattern may affect sensitivity. The sensitivity will be decreased when bigger parallel parasitic capacitance of CS pin is added. Parallel capacitor (CS1~S8) of CS pin is useful in case of detail sensitivity mediation is required such as for complementation sensitivity difference between channels. Same as above parallel parasitic capacitance, sensitivity will be decreased when a big value of parallel capacitor (CS1~S8) is used. Under 50pF capacitor can be used as sensitivity meditation capacitor and a few pF is usually used. The RS, serial connection resistor of CS pins, may be used to avoid mal-function from external surge and ESD. (It might be optional.) From 200Ω to 1kΩ is recommended for RS. Refer to below CS pins application figure. RS8 CS8 << Touch PAD8 CS8 RS1 CS1 << Touch PAD1 CS1 The TS08P has eight independent touch sensor input from CS1 to CS8. The internal touch decision process of each channel is separated from each other. Therefore eight channel touch key board application can be designed by using only one TS08P without coupling problem. The size and shape of 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 touch PAD is recommended to be routed as short as possible to prevent from abnormal touch detect caused by connection line. ADSemiconductor Confidential 7 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 6.3 SYNC implementation The TS08P has five SYNC pins to make it possible to operate with many optional functions such TM as SYNC function, sensitivity selections, output mode selection, output level selection, and calibration speed selection. No external component is used for above selections. The determination of SYNC pins connection of TS08P is accomplished in initial operation periods. Therefore changing connection of SYNC pin after initial operation period cannot affect the optional function selection. SYNCTM function 6.3.1 TM For SYNC function, all SYNC pins (form SYNC1 to SYNC5) have same function. So, at least, TM one of five SYNC pins operates as SYNC function, TS08P can be operated with other TS08P or TSxx series without interfering with each other. Inside of TS08P, there is internal oscillator for TM SYNC pulse so no external component is used for SYNC function. Simply, it is needed to TM connect SYNC pin to other SYNC pin of TS08P or TSxx series for using SYNC function. For TM proper SYNC function, less five other TS08P or TSxx series can be connected with. SYNC << st 1 TS08P nd 2 SYNC << TS08P or TS** SYNC pulse SYNC << th 5 TS08P or TS** 6.3.2 Sensitivity selections SYNC1 and SYNC2 pin of TS08P can be used as sensitivity selection pin. Both of two SYNC pins have three methods of connection. Open connection (N.C., SYNC connection), connection to GND, and connection to VDD are these methods. As below table, TS08P has 9 step sensitivity selections. When SYNC1 pin or SYNC 2 pin has no connection to GND or VDD, that TM SYNC pin may be simultaneously used for SYNC function. Sensitivity level (thickness [mm] of proper poly-carbonate insulator) of each sensitivity selection SYNC1 N.C. Connect to VDD Connect to GND SYNC2 (SYNC connection) Connect to GND 15.0 13.0 11.0 N.C. (SYNC connection) 9.0 7.5 6.0 Connect to VDD 5.0 4.0 3.0 The size of touch PAD is 10 ㎜ｘ 7 ㎜ used. Note 10: Above proper thickness is reliable but it can be changed by insulator material and application. Note 9: ADSemiconductor Confidential 8 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 6.3.3 Output mode selections SYNC3 pin of TS08P is output mode selection input pin. SYNC3 also has three connections, such as open connection (N.C., SYNC connection), connection to GND, and connection to VDD. The output mode of each connection is such as below table. When SYNC3 pin has no connection to GND or VDD and TS08P operates as dual-single output mode, SYNC3 pin may TM be simultaneously used for SYNC function. Output mode of each SYNC3 connections SYNC3 connection Connect to VDD Connect to GND N.C. (SYNC connection) Output mode Single output Multi-output Dual-single output When SYNC3 is connected to VDD and TS08P operates as single output mode, the one output that is detected fastest is appeared. So application PCB composed very near touch pads is possible to operate without confusion of neighborhood touch. When SYNC3 is open and TS08P operates as dual-single output mode, the one output that is detected fastest among CS1~CS4 and the one output that is detected fastest among CS5~CS8 is appeared independently. At multi-output mode, all output of TS08P can be appeared. 6.3.4 Output level selections SYNC4 pin of TS08P is output level selection input pin. SYNC4 also has three connections, such as open connection (N.C., SYNC connection), connection to GND, and connection to VDD. The output level of each connection is such as below table. When SYNC4 pin has no connection to GND or VDD and TS08P operates as active low output level, SYNC4 pin may be simultaneously TM used for SYNC function. Output level of each SYNC4 connections SYNC4 connection Connect to VDD Connect to GND N.C. (SYNC connection) Output level Active high Analog output Active low When active high is selected TS08P outputs are low in normal state and become high in touch detect state. When TS08P is used as active low output, the level of normal state is high and that of touch detect is low. TS08P has internal analog output circuit and all the output of CS can be express as analog voltage value using only two output ports (OUT1, OUT8). Analog voltage output values for from OUT1 to OUT4 are expressed by OUT1 pin, and for from OUT5 to OUT8 are expressed by OUT8 pin. Analog voltage output values for each output in analog output mode are as below equations. In this analog output mode, other parallel outputs (OUT2~OUT7) have each states digital output (High or low) and output mode is selected by SYNC3 connection. But, even if output mode is multi-output, OUT1 (OUT8) has only one analog output value of lower voltage. No other external component is needed in this analog output mode. ADSemiconductor Confidential 9 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) Analog output circuit of TS08P Analog OUT1 : V OUT1_CS1 Analog OUT2 : V OUT1_CS 2 Analog OUT3 : V OUT1_CS 3 Analog OUT4 : V OUT1_CS 4 Analog OUT5 : V OUT1_CS 4 Analog OUT6 : V OUT1_CS 3 Analog OUT7 : V OUT1_CS 2 Analog OUT8 : V OUT1_CS1 0 V DD 0 [V] R1 R2 V DD 0.306 V DD [V] R1 R 2 R2 R3 V DD 0.5 V DD [V] R1 R2 R3 R2 R3 R4 V DD 0.706 V DD [V] R1 R2 R3 R4 R7 R6 R5 V DD 0.706 V DD [V] R8 R7 R6 R5 R7 R6 V DD 0.5 V DD [V] R8 R7 R6 R7 V DD 0.306 V DD [V] R8 R7 0 V DD 0 [V] R8 ADSemiconductor Confidential 10 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) The OUTPUT pins have an open drain structure. For this reason, in the case of using TS08P as active high or active low the connection of pull-up resistor ROUT is required between OUTPUT and VDD. The maximum output sink current is 4mA, so over a few kΩ must be used as ROUT. Normally 10kΩ is used as ROUT. VDD ROUT1 OUT1 OUTPUT1 ROUT2 ROUT3 OUTPUT2 OUT2 ROUT4 OUTPUT3 OUT3 ROUT5 OUTPUT4 OUT4 OUTPUT5 OUT5 ROUT6 OUTPUT6 OUT6 ROUT7 OUTPUT7 OUT7 ROUT8 OUTPUT8 OUT8 ADSemiconductor Confidential 11 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 6.3.5 Internal calibration speed selections SYNC5 pin of TS08P is calibration selection input pin. SYNC5 also has three connections, such as open connection (N.C., SYNC connection), connection to GND, and connection to VDD. The calibration speed of each connection is such as below table. When SYNC5 pin has no connection to GND or VDD and TS08P operates as normal calibration speed, SYNC5 pin may TM be simultaneously used for SYNC function. Calibration speed of each SYNC5 connections SYNC5 connection Connect to VDD Connect to GND N.C. (SYNC connection) Calibration speed Fast Slow Normal It is recommendable to use fast calibration speed at various environmental conditions. Current consumption is increased when faster calibration speed is used.(refer 6.1 Current consumption) 6.4 Internal reset operation The TS08P has stable internal reset circuit to offer 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 TS08P power reset, that helps simple circuit design and to realize the low cost application. ADSemiconductor Confidential 12 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 7 Recommended Circuit Diagram Touch Pad1 VDD SYNC3 Touch Pad2 Touch Pad3 R5 10k R4 10k R3 10k R2 10k R1 10k CVDD 1u 0 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 18 17 16 15 14 13 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 SYNC2 DUMMY VSS SYNC4 SYNC5 OUT1 CS4 SY NC1 CS5 CS6 CS7 CS8 7 8 9 10 11 12 OUT1 SYNC4 SYNC5 VDD SYNC2 N.C Touch Pad8 1 2 3 4 5 6 TS08P SY NC1 Touch Pad7 R6 10k CS3 CS2 CS1 VDD SYNC3 OUT8 Touch Pad5 Touch Pad6 R7 10k 24 23 22 21 20 19 Touch Pad4 R8 10k SYNC1 ~ SYNC5 N.C. or to other TSxx series SYNC pins 0 0 TS08P-Q(24QFN) Application Example Circuit TS08P(24QSOP) Application Example Circuit ADSemiconductor Confidential 13 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) TS08P is reset by internal reset circuit. VDD voltage rising time should be shorter than 100msec for proper operation. The VDD periodic voltage ripple over 50mV and the ripple frequency is lower than 10 kHz can cause wrong sensitivity calibration. To prevent above problem, power (VDD, GND) line of touch circuit should be separated from other circuit. Especially LED driver power line or digital switching circuit power line certainly should be treated to be separated from touch circuit. The CS patterns also should be routed as short as possible and the width of line might be about 0.25mm. Parallel capacitor of CS pin could be useful in case detail sensitivity mediation is required such as for complementation sensitivity difference between channels. Serial connection resistor of CS pins may be used to avoid mal-function from external surge and ESD. The capacitor that is between VDD and GND is an obligation. It should be located as close as possible from TS08P. The CS pattern routing should be formed by bottom metal (opposite metal of touch PAD). The empty space of PCB must be filled with GND pattern to strengthen GND pattern and to prevent external noise from interfere with sensing frequency. The sensitivity can be changed by connection of SYNC1 and SYNC2. (See 6.3.2 Sensitivity selections) Output modes (single / multi / dual single) can be changed by connection of SYNC3. (See 6.3.3 Sensitivity selections) Output level in each state is selectable by connection of SYNC4. (See 6.3.4 Output level selections) The OUT1 ~ OUT8 are open drain output ports. Therefore, in the case of active high output or active low output, the pull-up resistor should be needed as above figure. But it is not necessary to use any pull-up resistor in analog output mode. (See 6.3.4 Output level selections) Internal sensitivity calibration speed can be changed by connection of SYNC5. It is recommendable to use fast calibration speed at various environmental conditions. (See 6.3.5 internal calibration speed selections) At least, one of five SYNC pins has SYNC connection, TS08P can be operated with other TS08P or TSxx series without interfering with each other. (See 6.3.1 SYNC Unused CS pins may be connected to GND for stable operation. TM function) ADSemiconductor Confidential 14 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 7.1 Example – Power Line Split Strategy PCB Layout A. Not split power Line (Bad power line design) The noise that is generated by AC load or relay can be loaded at 5V 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 (5V). B. Split power Line (One 5V regulator used) – Recommended C. Split power Line (Separated 5V regulator used) – Strongly recommended ADSemiconductor Confidential 15 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 8 MECHANICAL DRAWING 8.1 Mechanical Drawing of TS08P-Q (24 QFN) ADSemiconductor Confidential 16 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 8.2 Mechanical Drawing of TS08P (24 QSOP) Ref. : 24QSOP has 24 leads ADSemiconductor Confidential 17 / 19 ADSemiconductor® TS08P (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor) 9 MARKING DESCRIPTION Device Code : TS08P Type of version Channel Number Touch Switch Group Weekly Code : YY ZZ Manufacturing Year Manufacturing Week ADSemiconductor Confidential 18 / 19 ADSemiconductor® TS08P (8-CH Auto 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 19 / 19