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Número de pieza

componentes Descripción

Fabricante

TRC103

863-960 MHz RF Transceiver

RF Monolithics, Inc 

Pattern of Bits 4..3

00

01

10

11

Regulator Rise/Fall Times

3/3 µs

8.5/8.5 µs

15/15 µs

23/23 µs

OOK Rise/Fall Time

2.5/2 µs

5/3 µs

10/6 µs

20/10 µs

Table 62

It is generally a good practice to set the OOK rise and fall time to about 5% of a bit period to avoid excessive

modulation bandwidth:

tOOK = 50/BR

Where tOOK is the nominal 5% OOK rise/fall time in µs and BR is the bit rate in kb/s. At low OOK data rates the

20/10 µs rise/fall times given in the table above are satisfactory. When operating in the 863 - 870 MHz band under

ETSI EN300 220-1 regulations, check the modulation bandwidth carefully at bit rates above 8 kb/s to confirm

compliance. For operation in certain 863 - 870 MHz subbands, the required rise/fall time may be greater than 5%.

6.4 Frequency Synthesizer Channel Programming for FSK Modulation

When using a standard 12.8 MHz reference crystal, the FSK RF channel frequency is:

FRF = 14.4*(75*(P + 1) + S)/(R + 1), with P and S in the range 0 to 255, R in the range 64 to 169

Where FRF is in MHz, and P, S, and R are divider integers with S less than (P + 1). 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 63

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 64

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Page 51 of 65

TRC103 - 10/16/12

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