Manuale d’uso / di manutenzione del prodotto GM862-GPS del fabbricante Telit Wireless Solutions
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GM862-GPS Hardware User Guide GM862-GPS HW User Guide 1vv0300728 Rev. 0 - 27/04/06.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 2 of 55 Contents 1 Overview ........................................................
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GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 4 of 55 1 Overview The aim of this document is the description of some h a rdware solutions u seful fo r developi ng a product with the Telit GM862-GPS modules .
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 5 of 55 2 Hardware Commands 2.1 Turning ON the GM862-GPS To turn on the GM862-GPS the pin ON# must be tied low for at least 1 second and then released.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 6 of 55 For example: 1- Let'.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 7 of 55 2.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 8 of 55 2.2.2 Hardware Unconditional Reboot To unconditionally Reboot the GM862-GPS the pi n RESET# must be tied low for at least 200 milliseconds and then released.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 9 of 55 For example: 1- Let'.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 10 of 55 3 Power Supply The power.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 11 of 55 3.2 General Design Rules The principal guidelines for the Power Supply Design embrace three different design steps: - the electrical design - the thermal design.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 12 of 55 An example of linear reg.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 13 of 55 3.2.1.2 + 12V input Source Power Supply Design Guidelines • The desired output for the power supply is 3.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 14 of 55 An example of switching regulator with 12V input is: 3.2.1.3 Battery Source Power Supply Design Guidelines • The desired nominal output for the power supply is 3.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 15 of 55 3.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 16 of 55 As you can see, the char.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 17 of 55 3.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 18 of 55 3.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 19 of 55 4 Serial Ports The serial port on the Telit GM862-GPS is the core of the interface between the module and OEM hardware.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 20 of 55 The signals of the GM862.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 21 of 55 Signal GM862- GPS Pin Nu.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 22 of 55 An example of level tran.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 23 of 55 4.2 5V UART level translation If the OEM application uses a microcontroller with a serial port (UART) that works at a voltage different from 2.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 24 of 55 NOTE: The UART input lin.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 25 of 55 5 Audio Section Overview.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 26 of 55 Ear_MT- Ear_MT+ +20dB 36.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 27 of 55 5.1 Microphone paths charac teristic and requirements TIP: being the microphone circuitry the more noise sensitive , its design and layout must be done with particular care.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 28 of 55 TIP: definition of the nominal sensitivity of the microphone lines .
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 29 of 55 TIP: environment consideration .
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 30 of 55 5.2 General Design Rules There are several configurations for the audio paths, but the most effective difference is between balanced and unbalanced microphone configuration.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 31 of 55 5.4 Microphone Biasing The electret microphones usually need a biasing voltage to work properly.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 32 of 55 NOTE: The cable to the microphone should not be shielded, instead a twisted pair cable shall be used.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 33 of 55 NOTE: In the unbalanced application the capacitor C3 shall be > 200nF otherwise the frequency response will be cut at low band frequencies (down to 300Hz).
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 34 of 55 5.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 35 of 55 The buffer gain is given.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 36 of 55 5.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 37 of 55 The buffer bandwidth at -3dB shall be 4KHz. Note that the biasing of the operational amplifier is given for the inverting amplifier by the series divider R714-R715.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 38 of 55 C726 = 1/ (2 π *4000*R719)= 7.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 39 of 55 6 OUTPUT LINES (Speaker) 6.1 Short description. The Telit GM862-GPS provides two audio paths in receive section.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 40 of 55 6.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 41 of 55 6.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 42 of 55 6.4 Handset earphone design As seen previously, a 16 Ω earpiece can be directly connected to the output pads EAR_MT+ and EAR_MT- of the GM862-GPS .
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 43 of 55 The resulting gain and high pass cut can be obta ined with the formula: 2 3 R R Gain = 4 * 3 * 2 1 .
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 44 of 55 6.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 45 of 55 7 General Purpose I/O Th.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 46 of 55 7.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 47 of 55 8 GPS Receiver 8.1 GPS Antenna The GE863-GPS module is not provided with an internal LNA amplifier.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 48 of 55 9 Camera 9.1 Camera Transchip The GM862-GPS provides a direct support for Transchip digital cameras with the following characteristics: 9.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 49 of 55 n.c 13 DOUT_6 I/O n.c 14 DOUT_7 I/O n.c 15 DOUT_8 I/O n.c 16 VCLKOUT O n.c 17 VALIDH O n.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 50 of 55 Camera Socket Connector 9.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 51 of 55 EVB for Transchip camera support In order to interface the Telit GM862 with a CMOS camera, Telit has developed an ev aluation board.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 52 of 55 9.1.4 Block Diagram for supported camera DVDD is an external power supply of 2.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 53 of 55 9.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 54 of 55 9.
GM862-GPS Hardware User Guide 1vv0300728 Rev. 0 - 27/04/06 Reproduction forbidden without Telit Communications S.p.A. writte n authorization - All Right reserved page 55 of 55 10 Document Change Log R.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Telit Wireless Solutions GM862-GPS è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Telit Wireless Solutions GM862-GPS - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Telit Wireless Solutions GM862-GPS imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Telit Wireless Solutions GM862-GPS ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Telit Wireless Solutions GM862-GPS, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Telit Wireless Solutions GM862-GPS.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Telit Wireless Solutions GM862-GPS. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Telit Wireless Solutions GM862-GPS insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
