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参数资料
| 型号： | 4021-DKDB7 |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 26/34页 |
| 文件大小： | 783K |
| 描述： | KIT DEV TEST EZRADIO SI4021 TX |
| 标准包装： | 1 |
| 附件类型： | 测试卡，发射器，868MHz，915MHz |
| 适用于相关产品： | EZRadio? |
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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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