Summary of L76
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L76 evb user guide gnss module series rev. L76_evb_user_guide_v1.1 date: 2013-04-02 www.Quectel.Com.
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 1 / 25 our aim is to provide customers with timely and comprehensive service. For any assistance, please contact our company headquarter: quectel wireless solutions co., ltd. Room 501, building 13, no.99, tianzhou road, shangh...
Page 3: About The Document
Gnss module l76 evb user guide l76_evb_user guide confidential / released 2 / 25 about the document history revision date author description 1.0 2013-02-25 dishon zhou initial 1.1 2013-03-26 dishon zhou optimized the contents of chapter 3. Quectel confidential.
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 3 / 25 contents about the document ................................................................................................................................... 2 contents ...................................................
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 4 / 25 table index table 1: pins of uart port ....................................................................................................................... 11 table 2: switches and buttons ..............................
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 5 / 25 figure index figure 1: evb top view ................................................................................................................................ 7 figure 2: evb bottom view .............................
Page 7: Introduction
Gnss module l76 evb user guide l76_evb_user guide confidential / released 6 / 25 1 introduction this document defines and specifies the usage of l76 evb (evaluation board). You can get useful information about l76 evb and gnss demo tool from this document. Quectel confidential.
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 7 / 25 2 introduction to evb kit 2.1. Evb top and bottom view figure 1 : evb top view quectel confidential.
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 8 / 25 figure 2 : evb bottom view a: uart port b: serial port alternation switch c: reset button d: force_on button e: power switch f: micro-usb port g: indication leds h: antenna interface i: l76 module j: standby switch k: t...
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 9 / 25 figure 3: evb accessories a: usb cable b: gnss active antenna (3.3v) quectel confidential.
Page 11: Interface Application
Gnss module l76 evb user guide l76_evb_user guide confidential / released 10 / 25 3 interface application 3.1. Usb interface figure 4: micro-usb interface the main power is supplied via micro-usb interface. We provide two ways for data communication: micro-usb and uart interface which are controlled...
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 11 / 25 3.2. Uart interface figure 5: uart interface table 1: pins of uart port pin signal i/o description 2 rxd i receive data 3 txd o transmit data 5 gnd gnd quectel confidential.
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 12 / 25 3.3. Antenna interface figure 6: antenna interface figure 7 : lna layout quectel confidential.
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 13 / 25 for choice of external antenna, both of active antenna and passive antenna can be selected. Please note the lna is installed in the evb by default, so you have to move c109 to r112 and r118 to r105, when you want to re...
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 14 / 25 mode in the opposite operation. K1 force_on i press and release the button, the module will be waked up from backup mode. K2 reset i press and release this button, then the module will reset. 3.5. Operating status leds...
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 15 / 25 3.6. Test points figure 10: test points j106 table 4: pins of j106 pin signal i/o description 1 32k/drin reserved 2 aadet_n i active antenna open circuit detection 3 1pps o 1 pulse per second 4 standby i enter or exit ...
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 16 / 25 5/10 gnd ground 6 force_on logic high will force module to be waked up from backup mode. Keep this pin open or pulled low before entering into backup mode. If unused, keep this pin open. 7 reset i system reset 8 txd1 o...
Page 18: Evb And Accessories
Gnss module l76 evb user guide l76_evb_user guide confidential / released 17 / 25 4 evb and accessories the evb and its accessories are equipped as shown in figure 11. Figure 11: evb and accessory equipments quectel confidential.
Page 19: Install Device Driver
Gnss module l76 evb user guide l76_evb_user guide confidential / released 18 / 25 5 install device driver please note that you need to install the driver of micro-usb, when use micro-usb for data communication. The driver has been stored in our ftp server. The driver of cp210x also can be download f...
Page 20: Starting Powergps
Gnss module l76 evb user guide l76_evb_user guide confidential / released 19 / 25 6 starting powergps the powergps version is v2.2.0. The powergps tool can help user to view the status of gps&glonass receiver conveniently. When the tool is opened, the following window will be displayed: figure 12: p...
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 20 / 25 table 5: explanations of powergps window icon explanation sv with prn 65. If the position of sv is near to the centre of the sky view, the elevation angle of sv is close to 90°. Dark blue means this satellite is in tra...
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 21 / 25 pmtk command you can send pmtk command by powergps. The format of pmtk command includes only characters between „$‟ and „*‟, for example: pmtk869,0. Figure 13: mtk command automatic ttff testing this tool allows you to...
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 22 / 25 figure 14: static ttff testing click “set reference point”, choose “reference location”. After start positioning, click “use mean position”, then click “ok”. As shown in the screenshots below: quectel confidential.
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 23 / 25 figure 15: static ttff testing configuration options click “config”, set “ttff time- out (sec)”, then click “ok”, shown as below: in generally, if you choose hot start, “ttff time-out (sec)” sets 10s. If you choose war...
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Gnss module l76 evb user guide l76_evb_user guide confidential / released 24 / 25 figure 16: static ttff testing configuration the above operation is completed. Click on the run button to start the test and it can be stopped by clicking stop button. After finishing the testing, you can see the testi...
Page 26: Appendix A Reference
Gnss module l76 evb user guide l76_evb_user guide confidential / released 25 / 25 7 appendix a reference table 6: reference sn document name remark [1] l76_hardware_design l76 hardware design [2] l76_protocol_specification l76 protocol specification [3] l76_reference design l76 reference design tabl...