TRC103 Ver la hoja de datos (PDF) - RF Monolithics, Inc

Número de pieza

componentes Descripción

Fabricante

TRC103

863-960 MHz RF Transceiver

RF Monolithics, Inc 

The dual register set allows a new frequency to be completely entered in one register set while operating on the

other register set. It is important to load all three divider parameters into a register set before switching control to

it. Otherwise, a transient out-of-band frequency shift can occur. The dual register set facilitates FHSS operation,

as the operating frequency for the next hop can be loaded anytime during the current hop interval, making this

programming task less time critical. The values of P, S and R for FSK operation on several common frequencies

are given in Table 65. Software for determining P, S and R values for any in-band frequency is provided with the

TRC103 development kit.

Configuration

MCFG00 bits 4..3

P

S

R

868.3 MHz

10

106

55

133

915.0 MHz

01

100

50

119

955.0 MHz

10

62

50

71

Table 65

6.5 Frequency Synthesizer Channel Programming for OOK Modulation

When using a standard 12.8 MHz reference crystal the RF channel frequency for OOK receive is:

FTXRF = (14.4*(75*(P + 1) + S)/(R + 1)) - FDEV, with P, S in the range 0 to 255, R in the range of 64 to 169

Where FTXRF and transmitter deviation frequency FDEV are in MHz, and P, S, and R are divider integers where S

must be less than (P+1). An FDEV value of 0.1 MHz is normally used, which must match the receiver low IF fre-

quency FIF2. There are two sets of three registers that hold the values of P, S and R:

Register

MCFG06

MCFG07

MCFG08

MCFG09

MCFG0A

MCFG0B

Divider Parameter

R1

P1

S1

R2

P2

S2

Table 66

MCFG00 bit 0 selects the register set to use for the frequency synthesizer. A 0 value selects register set MCFG06

- MCFG08 and a 1 value selects register set MCFG09 - MCFG0B. In addition, MCFG00 bits 4..3 select the oper-

ating band as follows:

MCFG00 bits 4..3

10

00

01

10

11

Band

863 - 870 MHz

902 - 915 MHz

915 - 928 MHz

950 - 960 MHz

not used

Table 67

The dual register set allows a new frequency to be completely entered in one register set while operating on the

other register set. It is important to load all three divider parameters into a register set before switching control to

it. Otherwise, a transient out-of-band frequency shift can occur. The dual register set facilitates FHSS operation,

as the operating frequency for the next hop can be loaded anytime during the current hop interval, making this

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Page 52 of 65

TRC103 - 10/16/12

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