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參數資料
型號: SI4021-A1-FT
廠商: Silicon Laboratories Inc
文件頁數: 26/34頁
文件大?。?/td> 783K
描述: IC TX FSK 915MHZ 5.4V 16-TSSOP
標準包裝: 96
頻率: 433MHz,868MHz,915MHz
調制或協議: FSK,OOK
數據傳輸率 - 最大: 512kbps
功率 - 輸出: 8dBm
電流 - 傳輸: 24mA
數據接口: PCB,表面貼裝
天線連接器: PCB,表面貼裝
電源電壓: 2.2 V ~ 5.4 V
工作溫度: -40°C ~ 85°C
封裝/外殼: 16-TSSOP(0.173",4.40mm 寬)
包裝: 管件
產品目錄頁面: 585 (CN2011-ZH PDF)
其它名稱: 336-1622-5
Si4021
 
 
26
Sensitive Reset Enabled, Ripple on V
dd
:
time
V
dd
Reset threshold voltage
(600mV)
nRes
output
H
L
1.6V
Reset ramp line
(100mV/ms)
 
Sensitive reset disabled:
time
V
dd
Reset threshold voltage
(600mV)
nRes
output
H
L
250mV
Reset ramp line
(100mV/ms)
 
Software reset
Software reset can be issued by sending the appropriate control command (described at the end of the section) to the chip. The result of the
command is the same as if power-on reset was occurred.
Vdd line filtering
During the reset event (caused by power-on, fast positive spike on the supply line or software reset command) it is very important to keep
the Vdd line as smooth as possible. Noise or periodic disturbing signal superimposed the supply voltage may prevent the part getting out
from reset state. To avoid this phenomenon use adequate filtering on the power supply line to keep the level of the disturbing signal below
10mVp-p in the DC  50kHz range for 200ms from Vdd ramp start.. Typical example when a switch-mode regulator is used to supply the radio,
switching noise may be present on the Vdd line. Follow the manufacturers recommendations how to decrease the ripple of the regulator IC
and/or how to shift the switching frequency.
Related control commands
PLL setting and Reset Mode Command
Setting bit<1> to high will change the reset mode to normal from the default sensitive.
SW Reset Command
Issuing FE00h command will trigger software reset. See the Wake-up Timer Command.
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