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參數資料
型號: WI125 EVAL KIT
廠商: Connor-Winfield
文件頁數: 9/18頁
文件大小: 0K
描述: GPS TIMING RECEIVER EVAL BOARD
產品培訓模塊: 125 Series GPS Based Timing and Synchronization Products
標準包裝: 1
主要目的: 計時,時鐘發生器,同步器,GPS
嵌入式:
已用 IC / 零件: WI125
主要屬性: 1PPS/ 10 MHz 相位校準功能
次要屬性: LED 狀態指示器
已供物品: 模塊,板,天線,線纜,電源
其它名稱: CW681
W125 EVAL KIT
Wi125 Data Sheet #:
SG170
Page 17 of 20
Rev:
04
Date:
11/29/11
Copyright 2011 The Connor-Winfield Corp. All Rights Reserved
Specifications subject to change without notice
Figure 8 Grounding the Wi125 with a Ground Plane
Double via to host
system ground at this
one point. Digital and
RF grounds common
at this point.
8 APPLICATION HINTS continued
8.3 Grounding
InconnectingtheWi125intoahostsystem,goodgroundingpracticesshouldbeobserved.Specifically,ground
currentsfromtherestofthesystemhostingtheWi125shouldnotpassthroughthegroundconnectionstothe
Wi125.Thisismosteasilyensuredbyusingasinglepointattachmentfortheground.Theremustalsobeagood
connectionbetweentheRF_GNDandtheDIG_GNDsignals.Whilethereisnotaspecificneedtoputaground
planeundertheWi125,highenergysignalsshouldnotbetrackedundertheWi125.Itishoweverrecommended
thatagroundplanebeusedundertheWi125.Inthiscase,thefollowingwouldbeanexampleofthepatternthat
maybeused
VBATT
DIG_GND
CR2032 Cell
1K
VBATT
DIG_GND
0.47F Supercap
1K
VBATT
DIG_3V3
100R
Figure 7 Typical VBATT Supplies
8.4 Battery Backup
TheWi125hasanon-boardrealtimeclock(RTC).ThisisusedtostoredateandtimeinformationwhiletheWi125
ispowereddown.HavingavaliddateandtimespeedstheTimeToFirstFix(TTFF),allowingtheWi125tomeet
itsquotedTTFFspecification.TheWi125reliesonanexternalpowersourcetopowertheRTC(VBATT)whenthe
DIG_3V3isnotpresent.Iftheuserapplicationdoesnotrequirethewarmorhotfixperformance,ortherequired
informationisprovidedbynetworkassistance,thereisnoneedtoprovidetheVBATTsignal.TheVBATTsignal
mustbegreaterthan2.6VandlessthanDIG_3V3+0.6V.Typically,a3Vlithiumprimarycellorahighcapacity
“supercap”willbeused.TheWi125hasaninternalblockingdiode,soifa“supercap”orrechargeablebatteryis
used,anexternalchargingcircuitwillberequired.
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