RF96 datasheet(53/121 Pages) HOPE

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Page 53

RF96/97/98

Tel: +86-755-82973805

Fax: +86-755-82973550

E-mail: sales@hoperf.com http://www.hoperf.com

WIRELESS & SENSING

PRELIMINARY

DATASHEET

4.2.5.6. Receiver Hopping, Rx to Rx

Two methods are possible:

First method

Timeline

TS_HOP

+TS_RE

Rx Mode,

Channel A

1. set new Frf

2. set RestartRxWithPllLock

Rx Mode,

Channel B

Second method

Timeline

~TS_HOP

Rx Mode,

Channel A

1. set FastHopOn=1

2. set new Frf (*)

3. wait for TS_HOP

Rx Mode,

Channel B

(*) RegFrfLsb must be written to

trigger a frequency change

Figure 21. Receiver Hopping

The second method is quicker, and should be used if a very quick RF sniffing mechanism is to be implemented.

4.2.5.7. Tx to Tx

~PaRamp

+TS_HOP

~PaRamp

+TS_HOP

+TS_TR

Timeline

Tx Mode,

Channel A

1. set new Frf (*)

2. set FSTx mode

FSTx

Set Tx mode

Tx Mode,

Channel B

Figure 22. Transmitter Hopping

4.2.6. Receiver Startup Options

The RF96/97/98 receiver can automatically control the gain of the receive chain (AGC) and adjust the receiver LO

frequency (AFC). Those processes are carried out on a packet-by-packet basis. They occur:

 When the receiver is turned On.

 When the Receiver is restarted upon user request, through the use of trigger bits RestartRxWithoutPllLock or

RestartRxWithPllLock

, in RegRxConfig.

 When the receiver is automatically restarted after the reception of a valid packet, or after a packet collision.

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