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3.2.

External Connections

The board requires following hardware connections (Figure 4):



GLONASS/GPS antenna



USB cable for attaching to USB port of the Host PC.

For proper communication via USB, USB connections should be done after PC is powered up
and operating system is loaded.

Figure 4: Antenna and USB Connections

1. For correct operation of GeoS-3 module and on-board LED devices, the

selected value of VDD_IO voltage has no sense

2. The on-board battery provides backup power to the module for arranging

warm/hot starts only.

3.3.

Direct Access to GeoS-3 IO Pads

No any action required to access to Tx0, Tx1, 1PPS, STATUS, PD_ACK, ON/OFF, and nRESET
pads.

For accessing to Rx0, Rx1, PD

pads it’s necessary to remove 0 Ohm resistors R14, R15, and

R16.

Содержание GeoS-3

Страница 1: ...GeoS 3 Evaluation Board rev2 0 Technical Description R D Center GeoStar navigation Ltd Moscow 2012...

Страница 2: ...s pushbuttons 7 2 3 6 LEDs 8 2 3 7 Signal Pads 8 2 4 Assembly Drawing 9 3 How to Use the Board 9 3 1 USB Driver 9 3 2 External Connections 10 3 3 Direct Access to GeoS 3 IO Pads 10 3 4 Getting Started...

Страница 3: ...ription of the GeoS 3 Evaluation Board and intended for the users of GPS GLONASS SBAS OEM module GeoS 3 The document contains three chapters and appendix as follows Chapter 1 list of abbreviations Cha...

Страница 4: ...r navigation Ltd 2012 12 25 4 1 Abbreviations DC DC DC DC Converter IO Input Output LED Light Emission Diode LDO Low Drop Out Linear Regulator OS Operating System PC Personal Computer SW Soft Ware VCP...

Страница 5: ...ser Manual Downloadable from www geostar navigation com 2 2 Overall View 1PPS output USB port POWER switch VDD_IO switch ON OFF pushbutton nRESET pushbutton PD pushbutton GeoS 3 Antenna connector Back...

Страница 6: ...3 Level translators VDD_IO 3 3V Tx1 Rx0 Rx1 nRESET PD VDD_IO PD_ACK STATUS 0 TX0 TX1 RX0 RX1 0 PD_ACK STATUS 1PPS VBAT VDD VDD_IO V_ANT ON OFF NRESET PD E_PPS E_FRQ 0 DC DC LDO 3 3V 5 0V RX1 TX1 3 3V...

Страница 7: ...o the active USB Host 2 3 4 Connectors Antenna antenna port Type MMCX female straight Port 0 1 USB port Type USB type B 1PPS 1PPS output Signal levels are referred to VDD_IO Type SMA female right angl...

Страница 8: ...erial ports receive data indicators Flashing if the Host sends data to the module STATUS indicator of the module status Reflects following states of the module ACQUISITION POSITIONING and FALURE PD_AC...

Страница 9: ...installed The driver establishes two virtual COM ports for communicating with GeoS 3 over serial ports If demo SW GeoSDemo3 is used for evaluating GeoS 3 module then it s not necessary to install USB...

Страница 10: ...and operating system is loaded Figure 4 Antenna and USB Connections 1 For correct operation of GeoS 3 module and on board LED devices the selected value of VDD_IO voltage has no sense 2 The on board...

Страница 11: ...hing as soon as the Host is sending data to the module STATUS flashing rate depends on current module status ACQUISITION period is 2 seconds 1 second on 1 second off indicates the module is at signal...

Страница 12: ...n as the module is transmitting data Rx0 Rx1 flashing as soon as the Host is sending data to the module STATUS off in SLEEP state while in ACTIVE state behaves the same way as in full power mode PD_AC...

Страница 13: ...R D Center GeoStar navigation Ltd 2012 12 25 13 4 Appendix A Schematic Diagram Figure 5 Schematic Diagram...