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参数资料
| 型号： | MICRF507YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 26/47页 |
| 文件大小： | 0K |
| 描述： | TXRX FSK LOW PWR W/AMP 32MLF |
| 特色产品： | MICRF507 Low-Power FSK Transceiver |
| 标准包装： | 1 |
| 系列： | RadioWire® |
| 频率： | 470MHz ~ 510MHz |
| 数据传输率 - 最大： | 200kbps |
| 调制或协议： | FSK |
| 应用： | AMR，ISM，SRD |
| 功率 - 输出： | 10dBm |
| 灵敏度： | -113dBm |
| 电源电压： | 2 V ~ 2.5 V |
| 电流 - 接收： | 12mA |
| 电流 - 传输： | 21.5mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-VFQFN 裸露焊盘，32-MLF? |
| 包装： | 标准包装 |
| 其它名称： | 576-3694-6 MICRF507YML TRDKR MICRF507YML TRDKR-ND |
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r b
f OFFSET = FEE SIGNED
Micrel, Inc.
Another use for RSSI is to determine that transmit power
can be reduced in a system. If the RSSI detects a strong
signal, the transmitter could be alerted to reduce its
transmit power and so reduce current consumption.
FEE
The Frequency Error Estimator (FEE) counts pulses from
inside the demodulator to measure the frequency offset
between it’s receive frequency and the transmitter’s
frequency. The maximum offset that FEE can correctly
report a frequency difference is about ±20ppm. The output
of the FEE can be used to tune the XCO frequency, both
for production calibration and to compensate for crystal
temperature drift and aging.
The FEE is enabled when FEEC[1:0] = 11, and is off when
FEEC[1:0] = 00 (do not use other values). It has two
counters. One counter determines the measurement
period by generating a trigger every time it has counted up
the number of bit periods selected by the setting of
FEEC[3:2] as given in Table 15. A second counter
accumulates the net tally of UP and DN pulses from the
demodulator. For each incoming ‘1’ bit, UP carries an
average number of pulses that is twice the modulation
index ( β ), and likewise for each incoming ‘0’ bit and DN.
The trigger transfers the contents of the second counter to
the FEE register and clears it, after which it begins
accumulating again.
MICRF507
The result of the measurement, read from the FEE register
at address 22 (16 hex, 0010110 binary), is actually an
eight-bit two’s complement signed number, which can
have values from -128 to 127. Reading FEE gives the
most recently transferred value. The raw FEE value,
treated as an unsigned number ranging from 0 to 255, can
be converted into a signed integer as follows:
If FEE < 128 then {FEE SIGNED = FEE}
Else {FEE SIGNED = (FEE - 256)},
For a straightforward measurement of frequency offset, the
incoming signal has to have an equal number of ones and
zeros, such as a 1010… preamble. The frequency offset
can then be calculated:
4P
where FEE is the value read from the FEE register (treated
as a signed number), P is the number of data bits over
which the count is taken, and r b is the bit rate. When
f OFFSET is zero, the transmitter and receiver are perfectly
aligned. A positive f OFFSET means that the received signal
has a higher frequency than the carrier frequency to which
the receiver is tuned. To compensate for this, the
receiver’s XCO frequency should be increased by reducing
XCO_tune bits as detailed in the “Crystal Oscillator (XCO)”
section.
FEEC_1
0
0
1
1
FEEC_0
0
1
0
1
FEE Mode
Off
Do not use
Do not use
Counting UP and DN pulses. UP
increments the counter, DN
Counting a larger number of symbols (higher P) improves
the accuracy of the measurement. Beware, however, of
overflow, which can cause the FEE value to jump from
+127 to -128 after only one excessive count.
If the frequency offset is too large for the chosen P, then P
must be reduced. P = 8 or P = 16 is safest.
decrements it.
FEEC_3
0
0
1
1
FEEC_2
0
1
0
1
No. of bits used for the
measurement
8
16
Do not use
Do not use
Table 15. FEEC (Frequency Error Estimator Control) Bits
October 2, 2013
26
Revision 2.2
相关PDF资料 |
PDF描述 |
|---|---|
| MICRF600DEV1 | KIT DEV RADIOWIRE 902-928MHZ |
| MK01-C | SENSOR REED SPST-NO SMD |
| MK01-H | SENSOR REED SPDT-CHANGE SMD |
| MK02/0-1A66-500W | SENSOR REED SPST-NO |
| MK02/6-0 | SENSOR REED PCB 24MM T/H |
相关代理商/技术参数 |
参数描述 |
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| MICRF600 | 功能描述:TXRX ISM 902-928MHZ 11.5X14.1MM RoHS:否 类别:RF/IF 和 RFID >> RF 收发器 系列:RadioWire® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:30 系列:- 频率:4.9GHz ~ 5.9GHz 数据传输率 - 最大:54Mbps 调制或协议:* 应用:* 功率 - 输出:-3dBm 灵敏度:- 电源电压:2.7 V ~ 3.6 V 电流 - 接收:* 电流 - 传输:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 工作温度:-25°C ~ 85°C 封装/外壳:68-TQFN 裸露焊盘 包装:管件 |
| MICRF600 TR | 制造商:Micrel 功能描述:Micrel MICRF600 TR RF Transceivers |
| MICRF600_06 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:902-928MHz ISM Band Transceiver Module |
| MICRF600DEV1 | 功能描述:KIT DEV RADIOWIRE 902-928MHZ RoHS:是 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:RadioWire® 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796 |
| MICRF600TR | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:902-928MHz ISM Band Transceiver Module |
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