OM11055,598 NXP Semiconductors, OM11055,598 Datasheet
OM11055,598
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UM10370 User Manual for the PCF8883 Evaluation Kit OM11055 Rev. 02 — 2 December 2009 Document information Info Content Keywords Capacitive switch, sensor, proximity switch, PCF8883, OM11055, PCF8883 evaluation board Abstract The OM11055 is a PCF8883 evaluation board which can ...
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... NXP Semiconductors Revision history Rev Date Description 02 20091202 Fully updated version to reflect the change of the evaluation kit. Revision 1 was written for the preliminary evaluation board which was marked “MA142_EVALBOARD.BRD”. Revision 2 is valid for the new evaluation kit OM11055 (not marked as such on the board). ...
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... NXP Semiconductors 1. Introduction This user manual describes the OM11055 evaluation kit. This board was developed in order to provide a tool for application engineers and development engineers wishing to try and evaluate the single channel PCF8883 capacitive proximity switch. A LED displays the status of the switch; test points facilitate measurements of important signals. ...
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... NXP Semiconductors 3. Board description and layout Below the top view of the board is shown. Option to connect an external sense plate High impedance op-amp Fig 1. Top view of the PCF8883 evaluation board The lower halve is dominated by four sensor areas of different size. The actual circuit is on the upper halve of the board. Arrows indicate the parts of interest which are described more in detail in subsequent sections ...
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... NXP Semiconductors Fig 2. Selection of operating mode using jumper J9 4. User configurable settings The OM11055 kit allows the user to configure the PCF8883 sensor for evaluation in a specific application. 4.1 Sensor plate selection The OM11055 board includes four sensor plates on the board itself and provisions to connect the PCF8883 to an external sensor ...
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... NXP Semiconductors The size and form of the sensor plate can be varied to obtain optimal switching behaviour or to shape the sensor for a given application. The following figure shows some creative examples of how the switch can be used with sensors of various size and shape. Fig 4. Examples of sensor areas and shapes 4.2 Sensitivity settings The OM11055 board allows for easy modifications to the circuit to change the switch’ ...
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... NXP Semiconductors 4.3 Power supply options Power to the OM11055 PCB can be supplied using a mini USB cable (provided battery. The 9V battery connector can be removed and a user provided power supply could be connected at JP3 & JP4 for evaluation of a specific application. Using an external power supply also allows for easy measuring of the power consumption. ...
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... NXP Semiconductors Table 1. Optimizing step by step Step Component Description the total input capacitance ( chosen such that C measuring the voltage over and C form a low pass filter. The typical values are likely correct for most applications This resistance compensates large input capacitances (long coaxial C cable, larger sensor plate area) ...
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Fig 6. Schematic of OM11055 ...
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... Right to make changes — NXP Semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice ...
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... NXP Semiconductors 9. Contents 1. Introduction .........................................................3 2. Quick start............................................................3 3. Board description and layout.............................4 3.1 Setting the PCF8883 operation modes ..............4 4. User configurable settings .................................5 4.1 Sensor plate selection ........................................5 4.2 Sensitivity settings..............................................6 4.3 Power supply options .........................................7 4.4 High impedance op-amp ....................................7 5. Sensor adjustment ..............................................7 6. ...