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參數(shù)資料
| 型號： | WI125 EVAL KIT |
| 廠商： | Connor-Winfield |
| 文件頁數(shù)： | 9/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | GPS TIMING RECEIVER EVAL BOARD |
| 產(chǎn)品培訓(xùn)模塊： | 125 Series GPS Based Timing and Synchronization Products |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 計(jì)時(shí)，時(shí)鐘發(fā)生器，同步器，GPS |
| 嵌入式： | 否 |
| 已用 IC / 零件： | WI125 |
| 主要屬性： | 1PPS/ 10 MHz 相位校準(zhǔn)功能 |
| 次要屬性： | LED 狀態(tài)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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