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Telit GE863-QUAD / GE863-PY 

Hardware User guide

 

1vv0300715, Rev. ISSUE#0, - 21/02/06 

 

 

 

Reproduction forbidden without Telit Communication written authorization – All Right reserved – Right of modification reserved

 

page 34 of 71

 

 
 

6.4  Microphone buffering 

 
As seen previously, a microphone shall be connected to the input pads of the GE863-QUAD/PY 
through a buffer amplifier that boosts the signal level to the required value. 
Again the buffered microphone circuitry can be balanced or unbalanced. Where possible it is 
always preferable a balanced mic. solution. The buffering circuit shall be placed close to the 
microphone or close to the microphone wire connector. 
 

6.4.1  

 Buffered Balanced Mic. 

A sample circuit can be: 

 This circuit has a gain of 15 times (+24 dB), and is therefore suited for the internal mic. input, 
having a microphone with a sensitivity close to the suggested one (-45 dB

Vrms/Pa

), if the used 

microphone has a different sensitivity, or if the buffer is connected to the external mic. input, 
then a gain adjustment shall be done by changing resistors R604-R605 and R606-R607 and as a 
consequence the capacitors C636 and C637 to maintain the bandwidth 150-8000 (-3dB). 
The buffer gain is given by the formula: 

Содержание GE863-PY Pb balls

Страница 1: ...tion forbidden without Telit Communication written authorization All Right reserved Right of modification reserved page 1 of 71 T Te el li it t G GE E8 86 63 3 Q QU UA AD D G GE E8 86 63 3 P PY Y H Ha...

Страница 2: ...General Design Rules 11 3 2 1 Electrical design Guidelines 11 3 2 1 1 5V input Source Power Supply Design Guidelines 11 3 2 1 2 12V input Source Power Supply Design Guidelines 13 3 2 1 3 Battery Sour...

Страница 3: ...fered Unbalanced Single Ended Mic 37 7 SPEAKER 40 7 1 Speaker lines characteristics and requirements 40 7 2 General Design rules 42 7 2 1 Noise Filtering 43 7 3 Handset earphone design 43 7 4 Hands Fr...

Страница 4: ...6 Reproduction forbidden without Telit Communication written authorization All Right reserved Right of modification reserved page 4 of 71 10 CONFORMITY ASSESSMENT ISSUES 57 11 SAFETY RECOMMANDATIONS 5...

Страница 5: ...to be avoided shall be considered as mandatory while the suggested hardware configurations shall not be considered mandatory instead the information given shall be used as a guide and a starting point...

Страница 6: ...0 1 mA A simple circuit to do it is NOTE don t use any pull up resistor on the ON line it is internally pulled up Using pull up resistor may bring to latch up problems on the GE863 QUAD PY power regul...

Страница 7: ...ithout Telit Communication written authorization All Right reserved Right of modification reserved page 7 of 71 For example 1 Let s assume you need to drive the ON pad with a totem pole output of a 3...

Страница 8: ...work that the device will not be reachable any more 2 2 1 Hardware shutdown To turn OFF the GE863 QUAD PY the pad ON must be tied low for at least 1 second and then released The same circuitry and tim...

Страница 9: ...m pole digital output Using pull up resistor may bring to latch up problems on the GE863 QUAD PY power regulator and improper functioning of the module The line RESET must be connected only in open co...

Страница 10: ...nsmission rms 270 mA Average current during Power Saving 4 mA Average current during idle Power Saving disabled 19 mA The GSM system is made in a way that the RF transmission is not continuous else it...

Страница 11: ...utomotive Battery 3 2 1 1 5V input Source Power Supply Design Guidelines The desired output for the power supply is 3 8V hence there s not a big difference between the input source and the desired out...

Страница 12: ...are User guide 1vv0300715 Rev ISSUE 0 21 02 06 Reproduction forbidden without Telit Communication written authorization All Right reserved Right of modification reserved page 12 of 71 An example of li...

Страница 13: ...nductor size and its faster transient response This allows the regulator to respond quickly to the current peaks absorption For car PB battery the input voltage can rise up to 15 8V and this should be...

Страница 14: ...to avoid polarity inversions when connecting the battery The battery capacity must be at least 500mAh in order to withstand the current peaks of 2A the suggested capacity is from 500mAh to 1000mAh 3 2...

Страница 15: ...tery is considered fully charged when the pulse duty cycle is less than a threshold value typically 10 the pulse charge stops and eventually the maintenance starts The last phase is not properly a cha...

Страница 16: ...at which the device is requested to transmit by the network The average current consumption hence varies significantly TIP The thermal design for the Power supply should be made keeping an average co...

Страница 17: ...drops occur when the 2A current peaks are absorbed Note that this is not made in order to save power loss but especially to avoid the voltage drops on the power line at the current peaks frequency of...

Страница 18: ...PCB for a Telit GE863 QUAD PY device shall fulfil the following requirements ANTENNA REQUIREMENTS Frequency range Standard Dual Band GSM DCS frequency range or Standard Quad Band GSM DCS PCS frequenc...

Страница 19: ...t the end user has no manual instructions to remove or install the GE863 QUAD PY module Antennas used for this OEM module must not exceed 3dBi gain for mobile and fixed operating configurations 4 2 GS...

Страница 20: ...ntenna manufacturer instructions 5 Serial Ports The serial port on the Telit GE863 QUAD PY is the core of the interface between the module and OEM hardware 2 serial ports are available on the module M...

Страница 21: ...l VOL 0V 0 35V The signals of the GE863 QUAD PY serial port are RS232 Pin Number Signal GE863 QUAD PY Pad Number Name Usage 1 DCD dcd_uart 42 Data Carrier Detect Output from the GE863 QUAD PY that ind...

Страница 22: ...s are referred to the application side therefore on the GE863 QUAD PY side these signal are on the opposite direction TXD on the application side will be connected to the receive line here named TXD r...

Страница 23: ...is the level translator from the 0 3V UART level to the RS232 level while the receiver is the translator from RS232 level to 0 3V UART In order to translate the whole set of control lines of the UART...

Страница 24: ...uction forbidden without Telit Communication written authorization All Right reserved Right of modification reserved page 24 of 71 An example of level translation circuitry of this kind is The RS232 s...

Страница 25: ...tion uses a microcontroller with a serial port UART that works at a voltage different from 2 8 3V then a circuitry has to be provided to adapt the different levels of the two set of signals As for the...

Страница 26: ...50mA If VAUX is also used to supply a Camera no additional devices could be connected Pull up resistors can be connected to the VAUX pad provided that the pulled up lines are GE863 QUAD PY input lines...

Страница 27: ...ternal audio path should be used for handset function while the external audio path is suited for hands free function car kit Both microphone paths from the Telit GE863 QUAD PY are balanced and the OE...

Страница 28: ...n the microphone membrane For example With the internal mic having the suggested nominal sensitivity 45dBVrms Pa at the normal spoken conditions 4 7dB Pa on the microphone membrane At that acoustic pr...

Страница 29: ...p can be made for the headset having the microphone on the earpiece cable while the other kind of headset shall be threaten as an handset For example With the external mic having the suggested nominal...

Страница 30: ...crophone then keep the lines on the PCB balanced and unbalance the path close to the microphone wire connector if possible For the microphone biasing voltage use a dedicated voltage regulator and a ca...

Страница 31: ...tained from a dedicated voltage regulator in order to eliminate the noise present on the power lines This regulator can be the same for all the audio paths The microphone should be supplied from a cap...

Страница 32: ...tten authorization All Right reserved Right of modification reserved page 32 of 71 NOTE The microphone sensitivity changes with the value of R2 and R3 Usually the microphones are characterized with 2k...

Страница 33: ...ed microphone biasing can be 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 This capacitor can be...

Страница 34: ...t is always preferable a balanced mic solution The buffering circuit shall be placed close to the microphone or close to the microphone wire connector 6 4 1 Buffered Balanced Mic A sample circuit can...

Страница 35: ...With the mic having nominal sensitivity 45dBVrms Pa at the normal spoken conditions 4 7dB Pa at 7 cm from the mouth of the talker At that acoustic pressure the voltage output from the microphone is Mi...

Страница 36: ...roduction forbidden without Telit Communication written authorization All Right reserved Right of modification reserved page 36 of 71 As a consequence the values of the capacitors C636 and C637 shall...

Страница 37: ...the biasing the same circuit as seen before can be used to be noticed that the capacitor C3 on the unbalanced biasing circuit is not anymore needed if this Buffered design is used Two different config...

Страница 38: ...stics sensitivity 45 dBVrms Pa and you want to use it in the external mic audio path With the mic having nominal sensitivity 45dBVrms Pa at the normal spoken conditions 4 7dB Pa but at 50 cm from the...

Страница 39: ...l Right reserved Right of modification reserved page 39 of 71 R711 gain R708 1 5 10 15 k R719 gain 1 R720 1 5 1 10 5 k The commercial values of 15k 5 6k are then chosen As a consequence the values of...

Страница 40: ...The internal audio path should be used for handset function while the external audio path is suited for hands free function car kit Both speaker outputs from the Telit GE863 QUAD PY are bridged type a...

Страница 41: ...ut power 2 5 mW maximum power output 7 5 mW volume level steps SW 2 dB number of volume steps SW 10 The EVK2 v 1 2 audio output characteristics are internal external ear single ended line coupling AC...

Страница 42: ...st two applications need only few mW of power which can be directly drained from the GE863 QUAD PY pads provided a suited speaker is used This direct connect design is the cheaper and simpler solution...

Страница 43: ...ution speaker direct connect imposes the speaker characteristics to be almost exactly the suggested ones otherwise the power output may be reduced if speaker impedance is bigger than 16 or the GE863 Q...

Страница 44: ...roduction forbidden without Telit Communication written authorization All Right reserved Right of modification reserved page 44 of 71 The resulting gain and high pass cut can be obtained with the form...

Страница 45: ...utput requirement is usually at least 4W therefore an amplifier is needed to boost the GE863 QUAD PY output The design of the amplifier shall comply with the following guidelines The input to the ampl...

Страница 46: ...f modification reserved page 46 of 71 NOTE The GE863 QUAD PY audio path connected to the car kit hands free amplifier MUST be the external one EAR_HF otherwise the echo cancellation will not be done d...

Страница 47: ...all three modes and can be input output alarm output Alternate function GPIO7 supports all three modes and can be input output buzzer output Alternate function All GPIO pads are 2 8V CMOS signals and...

Страница 48: ...ither the application and the GE863 QUAD PY during sleep periods drammatically reducing the sleep comsumption to few A In battery powered devices this feature will greatly improve the autonomy of the...

Страница 49: ...rovide the interface connection between GE863 QUAD PY and Transchip camera GE863 QUAD PY signal TC5747MF24L Pin Signal I O Notes Pin Signal I O 55 GPIO3 O I2C bus serial clock 1 SCLK I 8 17 GND Ground...

Страница 50: ...f 71 n c n c 16 VCLKOUT O n c n c 17 VALIDH O n c n c 18 VALIDV O 31 VAUX O Power Supply 19 DVDD28 I 32 GPIO4 I O I2C bus serial data 20 SDIN I O 8 17 GND Ground 21 PS1 I 6 GPIO8 O Camera power type s...

Страница 51: ...PY Hardware User guide 1vv0300715 Rev ISSUE 0 21 02 06 Reproduction forbidden without Telit Communication written authorization All Right reserved Right of modification reserved page 51 of 71 Fig 2 C...

Страница 52: ...on reserved page 52 of 71 9 1 2 EVB for Transchip camera support In order to interface the Telit GE863 QUAD PY with a CMOS camera Telit has developed an evaluation board The EVK allows the connector o...

Страница 53: ...cation reserved page 53 of 71 9 1 3 Block Diagram for supported cameras The numbers on the left side of the Camera s connectors refers to Module Connector s pin number DVDD is VAUX1 power supply from...

Страница 54: ...are User guide 1vv0300715 Rev ISSUE 0 21 02 06 Reproduction forbidden without Telit Communication written authorization All Right reserved Right of modification reserved page 54 of 71 9 1 4 Schematic...

Страница 55: ...A 0 camera quality 0 low 1 medieum 2 high OK AT CAMRES 0 camera resolution 0 VGA 1 QVGA 2 QQVGA OK AT CAMCOL 0 camera color 0 color 1 grayscale OK AT CAMZOOM 0 camera zoom 0 x1 1 x2 2 x4 OK AT CAMTXT...

Страница 56: ...are User guide 1vv0300715 Rev ISSUE 0 21 02 06 Reproduction forbidden without Telit Communication written authorization All Right reserved Right of modification reserved page 56 of 71 OK AT CAMEN O ca...

Страница 57: ...Terminal Equipments Low Voltage Directive 73 23 EEC and product safety Directive 89 336 EEC for conformity for EMC In order to satisfy the essential requisite of the R TTE 99 5 EC directive the GE863...

Страница 58: ...ut Telit Communication written authorization All Right reserved Right of modification reserved page 58 of 71 Manufacturers of mobile fixed or portable devices incorporating this module are advised to...

Страница 59: ...ltage source and the wiring has to be conforming to the security and fire prevention regulations The product has to be handled with care avoiding any contact with the pins because electrostatic discha...

Страница 60: ...nity provides some Directives for the electronic equipments introduced on the market All the relevant information s are available on the European Community website http europa eu int comm enterprise r...

Страница 61: ...e 1vv0300715 Rev ISSUE 0 21 02 06 Reproduction forbidden without Telit Communication written authorization All Right reserved Right of modification reserved page 61 of 71 Document Change Log Revision...

Страница 62: ...GE863 PY Hardware User guide 1vv0300715 Rev ISSUE 0 21 02 06 Reproduction forbidden without Telit Communication written authorization All Right reserved Right of modification reserved page 62 of 71 12...

Страница 63: ...3 6C 3 7B 4 6E 5 2B 5 2D 5 8C STPS340U SMB U34 D104 1206 4 7 5 R112 0603 0 0 R103 TP102 3 7V 3Fs BC857B SOT 23 Q102 2 3 1 OT102 0603 2 0K 1 R114 1984617PT1 5_2 3 5 H PL107 2 1 GND GND 3 7V 0603 0 0 R...

Страница 64: ...1 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 GND RESET 1 9B 4E 3 7V EAR_MT 4 9B ON_OFF 1 9A 9B 0402 0 0 R204 GND 50V 0402 33pF COG C202 EAR_HF 4 11B IIC_SCL_HW 5 5D STAT_LED 9C STAT_LED...

Страница 65: ...L 9L 1U 2U 3U 4U 5U 6U 7U 8U 9U LDO_ON_OFF 1 11B 7B 4 6E 5 2B 5 2D 5 8C JP304 GND 10V 0603 220nF X7R C311 10V 0603 220nF X7R C315 GND GND TX_PROG_USB 5 5D 10V 0603 220nF X7R C309 0402 47K 5 R303 C103...

Страница 66: ...3 0603 1M 5 R407 0402 2 2K 5 R403 0603 0 0 R410 noMount YES GND GND GND 16V 0603 100nF Y5V C404 GND GND 0603 0 0 R412 noMount YES GND TP404 10V 0402 100nF Y5V C410 EAR_MT 2 3C TP403 JP402 0603 15 5 R4...

Страница 67: ...ND GND 0402 18K 5 R538 JP511 GND 0402 470 5 R527 IIC_SDA_HW 2 4B GND 5V_USB JP502 6 3V 0603 2 2uF X5R C515 GND 0402 18K 5 R524 TP502 RX_PROG_USB 3 2C 10V 0402 100nF X5R C503 74AHC1GU04DCKRG4 U504 5 VC...

Страница 68: ...63 PY Hardware User guide 1vv0300715 Rev ISSUE 0 21 02 06 Reproduction forbidden without Telit Communication written authorization All Right reserved Right of modification reserved page 68 of 71 13 EV...

Страница 69: ...A MON1 CAM_CLK 10D PD 3 5A PD 6 5A VCC_MAIN_CAM CAM_SDA IIC_SDA 6B 9B 4773540103470 SO109 2 1 3 TP102 25V 0402 15nF X7R C105 25V 0402 15nF X7R noMount YES C111 TGPIO_08 CAM_ON 5D 0402 0 0 R109 noMount...

Страница 70: ...RA cs1170 Drawn by Pasqualini Natascia A3 Project 0276 SHEET N 1 OF SHEETS 2 DRAWING CODE CS1170 SM 06 09 2005 ANNOTATION Silkscreen side A TUTTI I DIRITTI RISERVATI RIPRODUZIONE E DIVULGAZIONE VIETAT...

Страница 71: ...RA cs1170 Drawn by Pasqualini Natascia A3 Project 0276 SHEET N 2 OF SHEETS 2 DRAWING CODE CS1170 SM 06 09 2005 ANNOTATION Silkscreen side B TUTTI I DIRITTI RISERVATI RIPRODUZIONE E DIVULGAZIONE VIETAT...

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