AMS AS3933, Description, Page: 5 / 21

AS3933-AN01
Demoboard Description
www.ams.com Revision 1.1/ 24/02/13 page 5/20
Figure 2: User Interface Description
Label Name Description Info
A BUTTON
Long press (1.5s) tunes
the antenna Each axis (X,Y, and Z) of the LF antenna can be
tuned exactly to 125kHz. The resonance
frequency of each channel can be read out via the
GUI.
1x short press reads
the false wake-ups The number of false wake-ups can be read out
and displayed via the RSSI-LEDs.
2x short press (double
click) clears the false
wake-ups Pressing FALSE WAKEUP twice in quick
succession resets the number of false wake-ups.
Each RSSI-LED lights up shortly.
C ON/OFF ON/OFF-Switch Power on/off the Demoboard. Source (battery or
USB) is automatically detected.
G USB-
Connector Mini USB 5-pin
Connector USB 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 Red LED Strongest wake-up signal received on channel 2 (Y)
Z Red LED Strongest wake-up signal received on channel 3 (Z)
Figure 4: Jumper Description
Jumper Name Description Info
F IDD Supply
Current The supply current of the AS3933 can be measured here. Set
this jumper for normal operation.
D
AS3933 specific outputs
D1 WAKE Wake Output Interrupt
D2 DAT Data Output
D3 CL_DAT Manchester Recovered Clock
E
Microcontroller
interface The SDI interface from the microcontroller can be replaced by a
proprietary solution
E1 CS Serial Digital Interface Chip Select