MRF49XA-ISLASHT datasheet(46/102 Pages) MICROCHIP

部品番号	MRF49XA-I/T

部品情報	ISM Band Sub-GHz RF Transceiver

PDF	102 Pages

Scroll/Zoom	100%

メーカー	MICROCHIP [Microchip Technology]

ホームページ	http://www.microchip.com

Logo

46 / 102 page

MRF49XA

DS70590C-page 46

Preliminary

3.2

VDD Line Filtering

During the Reset event (caused by power-on, glitch on

the supply line or Software Reset), the VDD line should

be kept clean. Noise or a periodic disturbing signal

superimposed on the supply voltage may prevent the

device from getting out of the Reset state. To avoid this,

adequate filters should be made available on the power

supply lines to keep the distorting signal level

below 100 mVp-p, in the DC-50 kHz range for 200 ms,

from VDD ramp start. The usage of regulators or SMPS

may sometimes introduce switching noise on the VDD

line, so follow the power supply manufacturer’s

recommendations on how to decrease the ripple of

regulator IC and/or how to shift the switching frequency

while using SMPS.

The registers associated with power line filtering are:

•STSREG (see Register 2-1)

• FIFORSTREG (see Register 2-10)

• WTSREG (see Register 2-14)

MRF49XA-I/T データシート(PDF) 46 Page - Microchip Technology