EVB71122
300 to 930MHz Receiver
Evaluation Board Description
1.4 Enable/Disable in ABC Mode
ENRX
Description
0
1
Shutdown mode
Receive mode
Pin ENRX is pulled down internally. Device is in shutdown by default, after power supply on.
If ENRX = 0 and SPISEL = 1 then operating modes according to OPMODE bit (refer to control word R0).
If ENRX = 1 then OPMODE bit has no effect (hardwired receive mode).
1.5 Demodulation Selection in ABC Mode
MODSEL
Description
0
1
FSK demodulation
ASK demodulation
Pin MODSEL has no effect in SPI mode (SPISEL = 1). We recommend connecting it to ground to avoid a
floating CMOS gate.
1.6 Programming Modes
SPISEL
Description
0
1
ABC mode (8 channels preconfigured)
SPI mode (programming via 3-wire bus)
1.7 Preconfigured Frequencies in ABC Mode
A
0
0
1
1
0
0
1
1
B
0
1
0
1
0
1
0
1
C
0
0
0
0
1
1
1
1
Receive Frequency
FSK1: 369.5 MHz
FSK5: 388.3 MHz
FSK2: 371.1 MHz
FSK4: 376.9 MHz
FSK3: 375.3 MHz
FSK7: 394.3 MHz
FSK6: 391.5 MHz
FSK8: 395.9 MHz
As all pins, pins A, B, and C are equipped with ESD protection diodes that are tied to VCC and to VEE.
Therefore these pins should not be directly connected to positive supply (a logic “1”) before the supply volt-
age is applied to the IC. Otherwise the IC will be supplied through these control lines and it may enter into an
unpredictable mode. In case the user wants to apply a positive supply voltage to these pins before the sup-
ply voltage is applied to the IC, a protection resistor should be inserted in each control line.
39012 71122 01
Rev. 001
Page 6 of 32
EVB Description
Sept/06
MELEXIS [ Melexis Microelectronic Systems ]
