ADM1907 TouchCap® 1-Ch Touch Sensor Module SPECIFICATION V0.0 (Preliminary) November 2007 ADSemiconductor ADSemiconductor® ADM1907 TouchCap® (1-CH Touch Sensor Module) 1 General Specification 1.1 General Features 1-Channel capacitive touch sensor module Low power consumption Adjustable three step sensitivity Open-drain output Internal power on reset Embedded common and normal noise elimination circuit Simple and useful module package without bracket RoHS compliant 4DIP-MTM module package 1.2 Application Home appliance human interface switch Mechanical switch replacement Human interface for toys & interactive games Sealed control panels, keypads 1.3 Package (4DIP-MTM) (Top-view) Pin Description (4DIP-MTM) 1.4 PIN Number Name I/O 1 VDD Power Power (2.5V ~ 5.0V) GND 2 OUT Digital Output Output (Open drain) VDD/GND 3 GND Ground 4 ADJ Analog Input Note 1: Description Protection Supply ground Sensitivity selection input [Note1] VDD VDD/GND Refer to chapter 6.1 ADJ implementation for sensitivity selection. ADSemiconductor Confidential 1/6 ADSemiconductor® ADM1907 TouchCap® (1-CH Touch Sensor Module) 2 Electrical Characteristics 2.1 Absolute Maximum Ratings Supply voltage Maximum voltage on any pin Maximum current on any PAD Continuous power Dissipation Note 2: 5.5 V VDD+0.3 V 10mA 100mW Unless any other command is noted, all above are operated in normal temperature. 2.2 Electrical Characteristics ▪ VDD=3.3V (Unless otherwise noted), TA = 25℃ Characteristics Symbol Operating supply voltage VDD Current consumption IDD Test Condition VDD= 3.3V Min Typ Max Units 2.5 3.3 5.0 V - 25 40 ㎂ VDD= 5.0V - 40 70 Output maximum sink current IOUT TA = 25℃ - - 4.0 ㎃ Internal reset criterion VDD voltage VDD_RST TA = 25℃ - - 0.3∙VDD V Minimum detectable capacitance variation ΔCS 0.2 - - ㎊ Output impedance (open drain) - 12 - Zo Self calibration time after VDD setting ΔCS > 0.2pF Ω ΔCS < 0.2pF - 30M - TCAL - 200 - ms Maximum supply voltage rising time TR_VDD - - 100 ms Recommended ADJ resistor value RADJ - 2 - MΩ ADSemiconductor Confidential 2/6 ADSemiconductor® ADM1907 TouchCap® (1-CH Touch Sensor Module) 3 Application Notes 3.1 Apllication Example Module Name ADM1907 Total Height 19 mm Gasket Height 7 mm (Out of module) Side and 3D view of two channel application example of ADM1907 TouchCap® Application circuit example of ADM1907 TouchCap® 3.2 Sensitivity Selection Function of ADJ pin of ADM1907 TouchCap® is the selection of sensitivity without any additional external component except using RADJ case (has high sensitivity). ADJ implementation for sensitivity selection is informed as below chart. ADJ Connection Using RADJ Connection Connected to VDD Connected to GND Sensitivity High Middle Low Proper Thickness 7mm 5mm 3mm (Poly-Carbonate) Note 3: Above proper thickness is reliable but it can be changed by insulator material and application. ADSemiconductor Confidential 3/6 ADSemiconductor® ADM1907 TouchCap® (1-CH Touch Sensor Module) 3.3 Application Notes VDD periodic voltage ripples over 50mV or the ripple frequency which is lower than 10 kHz can cause wrong sensitivity calibration. To prevent above problem, power (VDD, GND) line of ADM1907 TouchCap® 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 that of ADM1907 TouchCap®. Recommended power line separation of ADM1907 TouchCap® A big inductance may be appeared when the connection line between main board and display board is too long. In that case, higher voltage ripple could be generated by above inductance. The capacitor which is between VDD and GND is an obligation. It should be placed as close as possible from ADM1907 TouchCap®. ADM1907 TouchCap® 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 ADJ pin. (Refer to chapter 3.2) To prevent interference between modules, link all ADJ pin and connect a resistor (RADJ, 2M) between ADJ pin to GND. ADM1907 TouchCap® OUT port has an open drain structure. The pull-up resistor should therefore be needed as above application example circuit. 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. Front insulator cover must be fastened well on sense gasket of ADM1907 TouchCap® in order to protect invalid sensitivity calibration. ADSemiconductor Confidential 4/6 ADSemiconductor® ADM1907 TouchCap® (1-CH Touch Sensor Module) 4 PACKAGE DESCRIPTION 4.1 Mechanical Drawing All dimensions are mm ADSemiconductor Confidential 5/6 ADSemiconductor® ADM1907 TouchCap® (1-CH Touch Sensor Module) 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 6/6