AMS AS3933 Manual - Página 10
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4.2.11 General Settings
Enable sensitivity boost: The channel amplifier gain is boosted to +3dB.
AGC only on carrier burst: The automatic gain control is acting only on the first carrier burst.
AGC UP-DOWN: The automatic gain control is operating in both directions (up and down). At
the beginning the gain of the channel amplifier is set to the maximum and the AGC reduces it
according to the received signal input level. If AGC UP-DOWN is disabled the AGC can only
decrease the gain for the whole duration of the data reception. In this mode the system holds
the RSSI peak.
Mask data before wakeup: During the pattern correlation it is possible to display the data
(received preamble + pattern) on the DAT pin, if this bit is disabled. Otherwise, this will be
masked. In case the user decides to mask the 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.
4.2.12 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.
4.2.13 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). Should the pattern correlation be
disabled, the AS3933 goes directly into the data receiving mode.
Enable Manchester decoder: If the Manchester decoder is enabled the data on the DAT pin can
be directly read binary. In addition, the recovered clock is presented on the CL_DAT pin.
Manchester Pattern Length: the Manchester pattern length can be selected between 16bit and
32bit. The possible selection of the wake-up pattern (Manchester) is changed accordingly.
16 bit pattern length: Each field of the wake-up pattern defines 4 bit, which are directly
Manchester encoded.
Example: 9 6 6 9 (Manchester) 1001 0110 0110 1001 (binary, Manchester conform); sum =
16bit
32 bit pattern length: Each field of the wake-up 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 sent as single string.
Double pattern: The wakeup pattern is doubled.
4.2.14 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.
4.2.15 Clear Wake
The Clear Wake button resets the WAKE pin manually.
ams Demo Kit Manual, Confidential
[v1-02] 2014-Jul-11
Page 10
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