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参数资料
| 型号： | DR-TRC105-304-EV |
| 厂商： | RFM |
| 文件页数： | 54/67页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 304MHZ RFM RFIC |
| 标准包装： | 1 |
| 类型： | 收发器 |
| 频率： | 303.325MHz ~ 307.3MHz |
| 适用于相关产品： | TRC105 |
| 已供物品： | 2 个板，天线，电池 |
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programming task less time critical. The values of P, S and R for FSK operation on several common frequencies
are given in Table 70. Software for determining P, S and R values for any in-band frequency is provided with the
TRC105 development kit.
Configuration
MCFG00 bits 4..2
P
S
R
315 MHz
000
34
0
119
434 MHz
011
42
30
107
447 MHz
100
58
45
143
Table 70
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:
F TXRF = (14.4*(75*(P + 1) + S)/(R + 1)) - F DEV , with P, S in the range 0 to 255, R in the range of 64 to 169
Where F TXRF and transmitter deviation frequency F DEV are in MHz, and P, S, and R are divider integers where S
must be less than (P+1). An F DEV value of 0.1 MHz is normally used, which must match the receiver low IF fre-
quency F IF2 . 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 71
MCFG05 bit 0 selects the register set to use with 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..2 select the
VCO operating band as follows:
MCFG00 bits 4..2
000
001
010
011
100
101
Band, MHz
300-330
330-365
365-400
400-440
440-470
470-510
Table 72
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 OOK receive operation on several common fre-
quencies are given in Table 73 for a 0.1 MHz F IF2 . Software for determining P, S and R values for any in-band
frequency is provided with the TRC105 development kit.
www.RFM.com E-mail: info@rfm.com
? 2009-2013 by RF Monolithics, Inc.
Technical support +1.800.704.6079
Page 54 of 67
TRC105 - 05/29/13
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