EVB71122 データシートの表示（PDF） - Melexis Microelectronic Systems

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EVB71122

300 to 930MHz Receiver Evaluation Board Description

Melexis Microelectronic Systems  

EVB71122

300 to 930MHz Receiver

Evaluation Board Description

1.4 Enable/Disable in ABC Mode

ENRX

Description

0

Shutdown mode

1

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

FSK demodulation

1

ASK demodulation

Pin MODSEL has no effect in SPI mode (SPISEL = 1). We recommend connecting it to ground to avoid a

floating CMOS gate.

PRELIMINARY 1.6 Programming Modes

SPISEL

0

1

Description

ABC mode (8 channels preconfigured)

SPI mode (programming via 3-wire bus)

1.7 Preconfigured Frequencies in ABC Mode

A

B

C

Receive Frequency

0

0

0

FSK1: 369.5 MHz

0

1

0

FSK5: 388.3 MHz

1

0

0

FSK2: 371.1 MHz

1

1

0

FSK4: 376.9 MHz

0

0

1

FSK3: 375.3 MHz

0

1

1

FSK7: 394.3 MHz

1

0

1

FSK6: 391.5 MHz

1

1

1

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

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