TS08P

TS08P 8-Channel Self Calibration Capacitive Touch Sensor SPECIFICATION V1.7 April 2009 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~5.5V) 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~5.5V) 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 6.0V 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 ▪ 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 5.5 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. Note 9 ㎂ : Slow calibration speed isn’t recommended if it has not problem of current consumption. 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