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参数资料
| 型号： | 4421-DKDB2 |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 15/45页 |
| 文件大小： | 0K |
| 描述： | KIT DEV TEST EZRADIO SI4421 TRX |
| 标准包装： | 1 |
| 附件类型： | 测试卡，收发器，434MHz |
| 适用于相关产品： | EZRadio? |
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Si4421
Description of the Control Commands
1. Configuration Setting Command
Bit
15
1
14
0
13
0
12
0
11
0
10
0
9
0
8
0
7
el
6
ef
5
b1
4
b0
3
x3
2
x2
1
x1
0
x0
POR
8008h
Bit el enables the internal data register.
Bit ef enables the FIFO mode. If ef = 0 then DATA (pin 6) and DCLK (pin 7) are used for data and data clock output.
x3
0
x2
0
x1
0
x0
0
Crystal Load Capacitance [pF]
8.5
b1
0
0
b0
0
1
Freq uenc y Ba nd
Reserved
43 3
0
0
0
0
0
0
0
1
1
1
0
1
9.0
9.5
10.0
1
1
0
1
86 8
91 5
…
1
1
1
1
1
1
0
1
15.5
16.0
2. Power Management Command
Bit
15
1
14
0
13
0
12
0
11
0
10
0
9
1
8
0
7
er
6
ebb
5
et
4
es
3
ex
2
eb
1
ew
0
dc
POR
8208h
Bit
er
ebb
et
es
ex
eb
ew
dc
Function of the control bit
Enables the whole receiver chain
The receiver baseband circuit can be separately switched on
Switches on the PLL, the power amplifier, and starts the
transmission (If TX register is enabled)
Turns on the synthesizer
Turns on the crystal oscillator
Enables the low battery detector
Enables the wake-up timer
Disables the clock output (pin 8)
Related blocks
RF front end, baseband, synthesizer, crystal oscillator
Baseband
Power amplifier, synthesizer, crystal oscillator
Synthesizer
Crystal oscillator
Low battery detector
Wake-up timer
Clock output buffer
The ebb , es , and ex bits are provided to optimize the TX to RX or RX to TX turnaround time.
The RF frontend consist of the LNA (low noise amplifier) and the mixer. The synthesizer block has two main components: the VCO
and the PLL. The baseband section contains the baseband amplifier, low pass filter, limiter and the I/Q demodulator.
To decrease TX/RX turnaround time, it is possible to leave the baseband section powered on. Switching to RX mode means disabling
the PA and enabling the RF frontend. Since the baseband block is already on, the internal startup calibration will not be performed,
the turnaround time will be shorter.
The synthesizer also has an internal startup calibration procedure. If quick RX/TX switching needed it may worth to leave this block
on. Enabling the transmitter using the et bit will turn on the PA, the synthesizer is already up and running. The power amplifier almost
immediately produces TX signal at the output.
The crystal oscillator provides reference signal to the RF synthesizer, the baseband circuits and the digital signal processor part.
When the receiver or the transmitter part frequently used, it is advised to leave the oscillator running because the crystal might need
a few milliseconds to start. This time mainly depends on the crystal parameters.
It is important to note that leaving blocks unnecessary turned on can increase the current consumption thus decreasing the battery
life.
15
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相关代理商/技术参数 |
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|---|---|
| 4421-DKDB5 | 功能描述:射频开发工具 Test Board BIFA TRx (868MHz) RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| 4421-DQ0025 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Heavy Duty Incremental Rotary Shaft Encoder |
| 4421-DQ4096 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Heavy Duty Incremental Rotary Shaft Encoder |
| 4421-DS0025 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Heavy Duty Incremental Rotary Shaft Encoder |
| 4421-DS4096 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Heavy Duty Incremental Rotary Shaft Encoder |
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