MTCH101 Single-Channel Proximity Detector Features: Package Type • Capacitive Proximity Detection System: - High Signal to Noise Ratio (SNR) - Adjustable sensitivity - Noise rejection filters - Automatic Environmental Compensation - Wide range of sensor shape and size support - Stuck Release Mechanism • No External Components • Low-Power mode • Response Time Down to 75 ms • Wide Operative Voltage: - 2.0V to 5.
MTCH101 Table of Contents 1.0 Device Overview ........................................................................................................................................................................ 3 2.0 Typical Circuit ............................................................................................................................................................................ 4 3.0 Sensitivity Adjustment..........................................................................
MTCH101 1.0 DEVICE OVERVIEW The MTCH101 provides an easy way to add proximity or touch detection to any human interface application. The device integrates a single-channel capacitive proximity detection, which can work through plastic, glass or wood-front panel. It also supports a wide range of conductive materials as sensor, like copper pad on PCB, silver or carbon printing on plastic, Indium Tin Oxide (ITO) pad, wire/cable, etc.
MTCH101 2.0 TYPICAL CIRCUIT The MTCH101 can work either as a stand-alone device to control a LED (see Figure 2-1) to indicate touch/ proximity, or work with host MCU (see Figure 2-2). FIGURE 2-1: TYPICAL CIRCUIT AS STAND-ALONE Proximity Sensor VDD MTCH101 R3 1 R5 MTPM MTI 4.7k VDD VDD 2 VDD VSS R4 3 MTSA MTO VDD 5 C1 0.1 µF R1 R6 6 1k 10k R2 FIGURE 2-2: 10k 4 TYPICAL CIRCUIT WITH HOST MCU Proximity Sensor Host MTCH101 R1 1 MTI MTPM 4 10k 4.
MTCH101 3.0 SENSITIVITY ADJUSTMENT FIGURE 3-3: The sensitivity of the system determines how far and fast it can respond to proximity or touch. The MTCH101 provides the MTSA pin to adjust the sensitivity, and the voltage on this pin will determine the sensitivity. VDD voltage will give the lowest sensitivity, while GND voltage will give the highest sensitivity.
MTCH101 4.0 POWER MODE The MTCH101 has two Power mode options: Normal mode and Low-Power mode. The state of the MTPM pin determines the Power mode. 4.1 Normal Mode Option The device will run in Normal mode if the MTPM pin is set high and no proximity or touch is detected. In this mode, after an active scan, sleep time is between 69 and 105 ms, as shown in Figure 4-1. The sleep time depends on the VDD voltage, the lower the voltage, the more time it will be in the Idle state.
MTCH101 5.0 RESET 5.2 The MTCH101 can be stuck in a proximity-detected state in some cases, such as sudden temperature change, or higher dielectric materials (metal, wood or glass) present near the sensor. Two methods can be used to release the proximity-detected state without repowering the device. Reset by Touch and Release A stuck release mechanism is implemented for this device. When the device is stuck in a proximity-detected state, the user can touch the sensor pad and then release.
MTCH101 6.0 INTERFACE WITH THE HOST The MTO pin can be considered as an open drain output. A pull-up resistor (usually 3.3k~10 k) is needed to interface with a host. The pull-up voltage can be any voltage lower than VDD. This allows a simple interface with a lower VDD host device (see Figure 6-1). FIGURE 6-1: INTERFACE WITH THE HOST 10k MTO DS41664A-page 8 R Host Digital Input Preliminay 2012 Microchip Technology Inc.
MTCH101 7.0 DETECTION DISTANCE FIGURE 7-1: DISTANCE vs. SENSOR AREA 7 Distance (inch) 6 5 4 3 2 1 0 1 1.5 2 2.5 3 Round Pad Diameter (inch) Note: The tested sensors are round solid pads on FR4 PCB. No ground plane was near the sensor, as this would give the maximum detection distance. 2012 Microchip Technology Inc.
MTCH101 8.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings(†) Ambient temperature under bias ..........................................................................................................-40°C to +125°C Storage temperature ............................................................................................................................-65°C to +150°C Voltage on VDD with respect to VSS ...............................................................................................
MTCH101 The tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore, outside the warranted range. Note: 8.
MTCH101 9.0 PACKAGING INFORMATION 9.1 Package Marking Information 6-Lead SOT-23 Example 20JR XXNN Legend: XX...X Y YY WW NNN e3 * Note: * Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package.
MTCH101 9.2 Package Details The following sections give the technical details of the packages.
MTCH101 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS41664A-page 14 Preliminary 2012 Microchip Technology Inc.
MTCH101 APPENDIX A: DATA SHEET REVISION HISTORY Revision A (10/2012) Initial release of this data sheet. 2012 Microchip Technology Inc.
MTCH101 INDEX A T Absolute Maximum Ratings ................................................ 10 Applications........................................................................... 1 Typical Circuit ....................................................................... 4 Typical Circuit as Standalone ............................................... 4 Typical Circuit with Host MCU .............................................. 4 B Block Diagram...........................................................
MTCH101 THE MICROCHIP WEB SITE CUSTOMER SUPPORT Microchip provides online support via our WWW site at www.microchip.com. This web site is used as a means to make files and information easily available to customers.
MTCH101 READER RESPONSE It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip product. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150. Please list the following information, and use this outline to provide us with your comments about this document.
MTCH101 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. [X](1) PART NO.
NOTES: DS41664A-page 20 Preliminary 2012 Microchip Technology Inc.
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