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AS3933
3D Low Frequency Wakeup Receiver
Application Note: AS3933-AN01 – Demoboard
Description
Page 1: ...www ams com Revision 1 1 24 02 13 page 1 20 AS3933 3D Low Frequency Wakeup Receiver Application Note AS3933 AN01 Demoboard Description ...
Page 2: ...ibrate RC Oscillator 9 5 2 5 Antenna Damper 9 5 2 6 Envelope Detector Time Constant 9 5 2 7 Data Slicer 9 5 2 8 Comparator Hysteresis 9 5 2 9 Gain Reduction 9 5 2 10 Frequency Detection Tolerance 10 5 2 11 General Settings 10 5 2 12 Wakeup Pattern Manchester 10 5 2 13 Correlator 10 5 2 14 Automatic Time Out 11 5 2 15 Clear Wake 11 5 2 16 Symbol Rate 11 5 2 17 Check Resonance Frequency 11 5 2 18 In...
Page 3: ...Schematics Layout and BOM 14 6 1 AS3933 Demoboard Schematic 14 6 2 AS3933 Demoboard Layout 15 6 3 AS3933 Demoboard BOM 16 6 4 125 kHz Wake up Transmitter Board Schematics 17 6 5 125 kHz Wake up Transmitter Board Layout 17 6 6 125 kHz Wake up Transmitter Board BOM 18 7 Ordering Information 19 Revision History Revision Date Owner Description 1 0 20 07 2010 JPE Initial release 1 1 24 02 2013 JRY Upda...
Page 4: ...ake up Transmitter Board 1x AS3933 Demoboard 2x CR2032 coin cells 1x USB cable 1x USB stick 3 Getting Started Connect the 9V DC power supply F to the 125kHz Wake up Transmitter Board Insert the 3V battery at H of the AS3933 Demoboard Turn on the AS3933 Demoboard via the ON OFF Switch C All LEDs flash up once Start transmitting wake up patterns via AUTO E of PATTERN B As soon as the AS3933 Demoboar...
Page 5: ...SB interface for GUI H CR2032 Battery Battery Holder Insert CR2032 coin cell here Figure 3 Indication LEDs LED Color Info RSSI 5 bit Red LEDs Received Signal Strength Indication Displays the actual received signal strength whenever a WAKEUP occurs When pressing FALSE WAKEUP these LEDs display the number of false wake ups that occurred X Red LED Strongest wake up signal received on channel 1 X Y Re...
Page 6: ...d B simultaneously before connecting the USB cable 4 2 125kHz Wake up Transmitter Board Figure 5 125kHz Wake up Transmitter Board Figure 6 User Interface Description Label Name Description Info A PATT DATA Pattern Data Button The transmitter continuously sends the wake up pattern plus data 01010101 B PATT Single Pattern Button The transmitter sends a single wake up pattern C AUTO Automatic Pattern...
Page 7: ...attern is sent Pattern Red LED Wake up pattern is transmitted Pattern Data Red LED Wake up pattern plus data is transmitted Note Before connecting the 125kHz Wake up Transmitter Board to the GUI the transmission of wake up patterns needs to be terminated by pressing button D 5 Software Description 5 1 Installing the GUI Execute the AS3933_EvalSW msi Follow the installation guide Run the GUI AS3933...
Page 8: ...ia 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 Note A possible firmware update can be done via Help Firmware Update Ctrl F Load the latest bin file and update the firmware 5 2 1 Channel Enable The AS3933 Demoboard has a three dimensional antenna Each of the thr...
Page 9: ...he absolute threshold The absolute threshold is set by selecting the hard threshold enable bit In quit environments no noise sources present the absolute threshold can be reduced by additionally setting the hard threshold reduction bit The dynamic threshold is enabled automatically when the hard threshold enable bit is not set In case the dynamic threshold is enabled the noise immunity of the Data...
Page 10: ... pin 5 2 12 Wakeup Pattern Manchester Select the wake up pattern here Each field defines 4 bit If the transmitted pattern matches the selected pattern a wake up interrupt is generated at the WAKE pin The WAKE pin goes high 5 2 13 Correlator 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 Shoul...
Page 11: ... to reset this field to none in order to continue with other settings 5 2 18 Input Capacitor Bank 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 12...
Page 12: ... the button Restore Default Settings 5 3 1 Duration of Carrier Burst The duration of the carrier burst can be set in multiples of carrier cycles 0 500 x 8µs or in milliseconds 1 3 5 3 2 Number of Preamble Symbols The carrier burst must be followed by a separation bit and at least 3 symbols preamble The actual number of preamble symbols can be adjusted here 5 3 3 Symbol Rate The symbol rate can be ...
Page 13: ...or more details on the wake up pattern see section 5 2 12 5 3 6 Manchester Pattern Length Please see description above in section 5 2 13 5 3 7 Correlator Please see description above in section 5 2 13 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 t...
Page 14: ...REG 16 VCAP 17 D 18 D 19 VUSB 20 RP15 23 VSS 24 VDD 25 MCLR 26 RP5 27 RP6 28 RA3 7 RP8 14 RP13 21 RP14 22 EP 29 U4 PIC27FJ64GB002 1 2 3 4 5 J3 ICP GND R5 10k AS1746 10 9 4 3 2 VDD 1 8 7 GND 6 5 NO1 COM1 IN1 NC1 NO2 COM2 IN2 NC2 EP 11 1 AS1746 C5 100n GND C12 150p C11 180p C19 18p VBUS D D D D C3 1u GND GND C1 10n C4 1u GND R1 100k VBUS GND C2 10u BATT BATT GND VDD_RF VDD_RF VDD_RF VDD_UC VDD_UC GN...
Page 15: ...AS3933 AN01 Demoboard Description www ams com Revision 1 1 24 02 13 page 15 20 6 2 AS3933 Demoboard Layout Figure 10 AS3933 Demoboard Layout Top Layer Figure 11 AS3933 Demoboard Layout Bottom Layer ...
Page 16: ...AS3933 AN01 Demoboard Description www ams com Revision 1 1 24 02 13 page 16 20 6 3 AS3933 Demoboard BOM ...
Page 17: ... GND VBUS D D D D C3 1u GND GND C4 1u GND VBUS GND C1 10u GND 3 3V 3 3V GND C11 10u 3 3V D7 PATTD R16 680 D8 PATT R17 680 D9 STANDBY R18 680 S1 Mode C2 10n GND GND AUTO S2 Mode C7 10n GND GND PATT AUTO PATT S3 Mode C8 10n GND GND PATT DATA S4 Mode C10 10n GND GND STOP NMOS1 PMOS1 VIN 3 VOUT 2 GND 1 U2 AS1360 R1 100k GND 1 2 3 J1 DC_Socket_THMD GND 12V D2 SK310A 3 3V C6 220u GND 2 7 4 GND 3 5 VCC 6...
Page 18: ...AS3933 AN01 Demoboard Description www ams com Revision 1 1 24 02 13 page 18 20 6 6 125 kHz Wake up Transmitter Board BOM ...
Page 19: ... QFN 4x4 16LD AS3933 7 inches Tape Reel 1000 pcs 1 Dry Pack Moisture Sensitivity Level MSL 3 according to IPC JEDEC J STD 033A Note All products are RoHS compliant and ams green Buy our products or get free samples online at ICdirect http www ams com ICdirect Technical Support is available at http www ams com Technical Support For further information and requests please contact us mailto sales ams...
Page 20: ...t is necessary to check with ams AG for current information This product is intended for use in normal commercial applications Applications requiring extended temperature range unusual environmental requirements or high reliability applications such as military medical life support or lifesustaining equipment are specifically not recommended without additional processing by ams AG for each applica...
Page 21: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information ams AS3933 DB ...
