Novatel OEM6 Integration Manual

Also see for OEM7 SPAN: User manual Installation and operation user guide Installation and operation manual Installation and Operation User Manual

Contents

Novatel OEM6 Integration Manual Manual pdf 159 page image

Chapter 3 New for OEM7 – HardwareOEM6 to OEM7 Integration Guide v1 159OEM6ReceiverIn Rush Current (Typ-ical)OEM7ReceiverIn Rush Current (Typ-ical)OEM617 6.0 A for less than 60 μs OEM729 2.0 A for less than 1.8 msOEM617D 6.0 A for less than 60 μs OEM7700 2.0 A for less than1.8 msOEM628 6.6 A for less than 60 μsOEM638 12.0 A for less than 60 μsUSB InterfacesThe layout guidelines are identical to those provided for OEM6, but the recommended common-modechoke value has changed. See USB Interface on page 168.The OEM719 and OEM729 USB interfaces default to 12 Mb/s ("Full-Speed") operation for back-wards-compatibility reasons. The OEM729 may be changed to 480 Mb/s ("Hi-Speed") operationthrough the use of a software command. Due to the multiplexing of COM3 with the USB interfaceon the OEM719 design, the OEM719 does not support operation at 480 Mb/s.3.2.3 Input and Output linesThe voltage limits and drive currents on the input and output lines of the OEM7 receivers are dif-ferent than the levels on the OEM6 receivers. See Table 83: OEM719 Strobe Electrical Spe-cification on page 189 and Table 92: OEM729 Strobe Electrical Specifications on page 205 fordetails.3.2.4 LNA PowerIf a short circuit or other problem causes an overload of the current supplied to theantenna, the receiver hardware shuts down the power supplied to the antenna. Torestore power, power cycle the receiver. The Receiver Status word, available in theRXSTATUS log (see page 134), provides more information about the cause of the prob-lem.OEM719On OEM615 receivers, LNA power is provided by an external power supply connected to pin 1 ofthe main connector.On OEM719 receivers, LNA power is generated on the receiver and pin 1 of the main connectorhas no electrical connection on the board. The OEM719 provides up to 200 mA of current at+5 VDC. The LNA is generated from the 3.3 V supply; therefore the OEM719 will draw morepower on the 3.3 V rail than a similarly configured OEM615.The typical current draw for a NovAtel active antenna is <40 mA. For a typical antenna, this mayincrease the power drawn from the 3.3 V supply by as much as 70 mA (as the LNA supply isapproximately 85-90% efficient).