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AS3933 DB 其他数据使用手册 - AMS（奥地利微电子）
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RF射频器件
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AS3933 DB数据手册
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AS3933 – Demo Kit Manual
3D Low Frequency Wakeup Receiver
www.austriamicrosystems.com Revision 1.00 6 - 12
data before the generation of the interrupt on the pin WAKE, then the data will be displayed only after the
generation of the interrupt.
Display clock generation: The clock generator output signal is displayed on CL_DAT pin.
Wakeup Pattern (Manchester)
Select Wakeup Pattern here. Each field is defines 4 bit. If the transmitted pattern matches the selected pattern, a
wakeup interrupt is generated at the WAKE pin. The WAKE pin goes high.
Correlator
Enable correlator: If the correlator is enabled the chip searches first for the preamble bits and then for data
pattern (Manchester encoded Wakeup Pattern). Should the pattern correlation be disabled, the AS3933 goes
directly in data receiving mode.
Enable Manchester decoder: If the Manchester decoder is enabled the data on the DAT pin can be directly
read binary. The data is provided on the DAT pin and in case the Manchester decoder is enabled, the recovered
clock is presented on the CL_DAT pin.
Manchester Pattern Length: If the Manchester Pattern length can be selected between 16bit and 32bit. The
possible selection of the Wakeup Pattern (Manchester) is changed accordingly.
16 bit pattern length: Each field of the Wakeup Pattern identifies 4 bit, which are directly Manchester encoded.
Each bit defines one Bit and is already conform to the Manchester Standard.
Example: 9 6 6 9 (Manchester) 1001 0110 0110 1001 (binary, Manchester conform); sum = 16bit
32 bit pattern length: Each field of the Wakeup Pattern identifies 4 bit, which are hexadecimal encoded. Each
bit defines one Symbol and is converted to Manchester by the microcontroller in the second step.
Example: 7 B A 5 (Symbol) 0111 1011 1010 0011 (binary) 10010101 01100101 01100110 10100101
(binary Manchester conform); sum = 32 bit
Single pattern: The wakeup pattern is send as single string.
Double pattern: The wakeup pattern is doubled.
Automatic Time-Out
The Automatic Time-Out resets the WAKE pin automatically after a certain time. This time can be selected
between 0ms and 350ms.
Clear Wake
The Clear Wake Button resets the WAKE pin manually.
Symbol Rate
The Symbol Rate can be adjusted between 512 Symbols/s and 4096 Symbols/s. The Symbol Rate defines the
duration of one bit via the 32.768 kHz Clock, in order to recover the data.
Check Resonance Frequency
The Resonance Frequency of all three channels of the antenna can be measured. This help to find the correct
capacitance to bring the LC circuit in resonance.
Note: It is important to note, to set the measurement to none again in order to continue with other settings.
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 Demo board provide 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. After this procedure the register map can be updated manually via File/Readout Registers (Ctrl+R) in
order to see the added capacitors at each channel.
Artificial Wakeup
It is possible to enable the Artificial Wakeup, which period can be adjusted between 1s and 2 hours.
Clear False Wakeup
The False Wakeup Register counts the number of frequency detections that do not match the wakeup pattern.
The actual number of False Wakeups can be deleted via the Clear False Wakeup button.
Reset RSSI
Reset the actual RSSI measurement.
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