Description of the GUI of the Transmitter ................12 4.3.1 Duration of the Carrier Burst ....................12 4.3.2 Number of Preamble Symbols ................... 12 4.3.3 Symbol Rate ........................12 ams Demo Kit Manual, Confidential Page 2 [v1-02] 2014-Jul-11 Document Feedback...
AS3933 Standard Board Introduction With the AS3933 Demoboard it is possible to demonstrate the chip’s features as described in the AS3933 datasheet. The 125kHz Wake-up Transmitter Board is included to offer the user a complete system for evaluation purposes. This application note describes the operation of the two boards and gives details on the hardware and software implemented in the demokit.
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Strongest wake-up signal received on channel 3 (Z) Figure 4: Jumper Description Jumper Name Description Info Supply The supply current of the AS3933 can be measured here. Set Current this jumper for normal operation. AS3933 specific outputs WAKE Wake Output Interrupt Data Output...
Ground (0V) Note: When the AS3933 Demoboard is connected to the GUI it is necessary to RESET the device by turning the AS3933 off and on via switch C. Another possibility to prepare the Demoboard for USB connection is to press buttons A and B simultaneously before connecting the USB cable.
Follow the installation guide Run the GUI AS3933_EvalSW.exe Note: Before connecting the 125 kHz Wake-up Transmitter Board to the GUI press button D to stop transmitting wake-up patterns. ams Demo Kit Manual, Confidential Page 7 [v1-02] 2014-Jul-11 Document Feedback...
Preset Default. All configurations that are set by the GUI correspond to the Register Map of the AS3933. The Register Map can be viewed via View/Register Map (Ctrl+M). All registers can be updated manually via File/Readout Registers (Ctrl+R) or the update of the registers is done automatically via File/Automatic Update (Ctrl+U).
The RC oscillator can be calibrated via the microcontroller or the LC antenna. 4.2.5 Antenna Damper The antenna can be damped in order to limit the range. Therefore a resistor inside the AS3933 is switched into parallel to the antenna. The value of the resistor can be selected between 1kΩ to 27kΩ.
Enable Correlator: If the Correlator is enabled the chip searches first for the preamble bits and then for data pattern (Manchester encoded wake-up pattern). Should the pattern correlation be disabled, the AS3933 goes directly into the data receiving mode. ...
The internal capacitor bank can be changed on each channel between 0pF and 32pF in order to tune the antenna to the desired resonance frequency. The AS3933 Demoboard provides a switch to tune the antenna automatically to 125 kHz. The internal capacitor bank is changed until the resonance frequency of 125 kHz is achieved.
4.3.3 Symbol Rate The symbol rate can be adjusted between 512 Symbols/s and 4096 Symbols/s. The symbol rate must be the same as at the settings made with the AS3933 Demoboard. 4.3.4 Enable Buzzer The transmitter board sends out a tone whenever a packet is transmitted. This tone can be disabled here.
Note: It is important to note that the symbol rate, wake-up pattern, pattern length, and the Correlator have the same settings at the AS3933 Demoboard and the 125kHz Wake-up Transmitter Board. Otherwise the demoboard will not recognize the signal that is transmitted by the 125 kHz Wake-up Transmitter Board. If something does not work, restore the default settings at the demoboard and transmitter board.
AS3933 Standard Board Ordering & Contact Information Ordering Code Description AS3933 DEV SYSTEM AS3933 Demo Kit Standard Board Buy our products or get free samples online at: www.ams.com/ICdirect Technical Support is available at: www.ams.com/Technical-Support Provide feedback about this document at: www.ams.com/Document-Feedback...
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Page 1-01 Update to corporate format (2013-Feb-24) 1-02 Update to corporate format 1-20 Note: Page numbers for the previous version may differ from page numbers in the current revision. ams Demo Kit Manual, Confidential Page 20 [v1-02] 2014-Jul-11 Document Feedback...
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