- 您现在的位置：买卖IC网 > PDF目录21904 > 4421-DKDB2 (Silicon Laboratories Inc)KIT DEV TEST EZRADIO SI4421 TRX PDF资料下载
参数资料
| 型号： | 4421-DKDB2 |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 25/45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? |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页当前第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页
Si4421
14. Wake-Up Timer Command
Bit
15
1
14
1
13
1
12
r4
11
r3
10
r2
9
r1
8
r0
7
m7
6
m6
5
m5
4
m4
3
m3
2
m2
1
m1
0
m0
POR
E196h
The wake-up time period can be calculated by ( m7 to m0 ) and ( r4 to r0 ):
T wake-up = 1.03 · M · 2 R + 0.5 [ms]
Note:
? For continual operation, the ew bit should be cleared and set at the end of every cycle.
? For future compatibility, use R in a range of 0 and 29.
15. Low Duty-Cycle Command
Bit
15
1
14
1
13
0
12
0
11
1
10
0
9
0
8
0
7
d6
6
d5
5
d4
4
d3
3
d2
2
d1
1
d0
0
en
POR
C80Eh
With this command, autonomous low duty-cycle operation can be set in order to decrease the average power consumption in receive
mode.
Bits 7-1 ( d6-d0 ):
The duty-cycle can be calculated by using ( d6 to d0 ) and M. (M is parameter in a Wake-Up Timer Command , see
above). The time cycle is determined by the Wake-Up Timer Command .
duty-cycle= (D · 2 +1) / M · 100%
Bit 0 (en) : Enables the low duty-cycle Mode. Wake-up timer interrupt is not generated in this mode.
Note: In this operation mode, bit er must be cleared and bit ew must be set in the Power Management Command (page 15) .
In low duty-cycle mode the receiver periodically wakes up for a short period of time and checks if there is a valid FSK transmission in
progress. FSK transmission is detected in the frequency range determined by Frequency Setting Command (page 17) plus and
minus the baseband filter bandwidth determined by the Receiver Control Command (page 17). This on-time is automatically
extended while DQD indicates good received signal condition.
When calculating the on-time take into account:
-
-
the crystal oscillator, the synthesizer and the PLL needs time to start, see the AC Characteristics (Turn-on/Turnaround
timings) on page 11
depending on the DQD parameter, the chip needs to receive a few valid data bits before the DQD signal indicates good
signal condition ( Data Filter Command , page 19)
Choosing too short on-time can prevent the crystal oscillator from starting or the DQD signal will not go high even when the received
signal has good quality.
There is an application proposal on page 26. The Si4421 is configured to work in FIFO mode. The chip periodically wakes up and
switches to receiving mode. If valid FSK data received, the chip sends an interrupt to the microcontroller and continues filling the RX
FIFO. After the transmission is over and the FIFO is read out completely and all other interrupts are cleared, the chip goes back to low
power consumption mode.
25
相关PDF资料 |
PDF描述 |
|---|---|
| 4420-DKDB2 | KIT DEV TEST EZRADIO SI4420 TRX |
| 4421-DKDB1 | KIT DEV TEST EZRADIO SI4421 TRX |
| 4322-DKDB1 | KIT DEV TEST EZRADIO SI4322 RX |
| 4021-DKDB13 | KIT DEV TEST EZRADIO SI4021 TX |
| ASPI-0418FS-KIT | INDUCTOR KIT SHIELD ASPI |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
发布紧急采购，3分钟左右您将得到回复。