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参数资料
| 型号： | DR-TRC103-915-EV |
| 厂商： | RFM |
| 文件页数： | 50/65页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 915MHZ RFM RFIC |
| 标准包装： | 1 |
| 类型： | 收发器，SRR |
| 频率： | 902MHz ~ 928MHz |
| 适用于相关产品： | TRC103-915 |
| 已供物品： | 2 个板，天线，电池 |
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least 24 bits is recommended for F CAS , and a preamble of at least 48 bits is recommended for F CAL . For most
average-referenced threshold applications, F CAS should be used in conjunction with a mechanism to avoid trans-
mitting a long sequence of bits of the same value, such as the TRC103’s data scrambling or Manchester encod-
ing options.
The peak-referenced threshold is generated from the RSSI signal using a fast attack, slow decay peak detector
emulation. The slicer threshold is immediately set to 6 dB below the peak value of the RSSI signal anytime the
RSSI value exceeds the threshold by 6 dB. The threshold then decays by a configurable dB step when a configu-
rable interval passes without the RSSI signal peaking 6 dB above the threshold. The decay step is configured with
RXCFG15 bits 7..5 as shown in Table 60:
Pattern of Bits 7..5
000
001
010
011
100
101
110
111
Decay Step
0.5 dB
1.0 dB
1.5 dB
2.0 dB
3.0 dB
4.0 dB
5.0 dB
6.0 dB
Table 60
The decay interval is configured with RXCFG15 bits 4..2 as shown in Table 61:
Pattern of Bits 4..2
000
001
010
011
100
101
110
111
Decay Interval
once per chip
once per 2 chips
once per 4 chips
once per 8 chips
twice per chip
four times per chip
8 times per chip
16 times per chip
Table 61
The chip period t CP is equal to the bit period except when Manchester encoding is used. For Manchester encod-
ing, the chip period is equal to ? the bit period:
t CP = 1/BR without Manchester encoding, t CP = 1/(2*BR) with Manchester encoding
Where t CP is in ms and BR is in kb/s. The default values of 0.5 dB per decay step and 1 decay interval per chip
provide a good starting point for most applications. For application environments that contain pulse noise, such as
operation in a band where other FHSS systems are operating, using Manchester encoding and decreasing the
decay interval to twice or four times per chip and/or increasing the decay step to 1 dB will reduce the “blinding”
effect of pulse noise. Multipath flutter tolerance is also improved by using Manchester encoding and decreasing
the decay interval and/or increasing the decay step size.
6.3.3 OOK Transmitter Related Configuration Values
MCFG0C bits 4..3 allow the rise and fall time of the power amplifier regulator to be adjusted. Using the default
component values for R6 and C5 as shown in Figure 2, the rise and fall times for the power amplifier regulator
and the OOK modulation are given in Table 62:
www.RFM.com E-mail: info@rfm.com
? 2009-2010 by RF Monolithics, Inc.
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Page 50 of 65
TRC103 - 11/29/12
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