Telit Wireless Solutions GC864 Hardware User's Manual
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Telit Wireless Solutions GC864 Hardware User's Manual

Telit Wireless Solutions GC864 Hardware User's Manual

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GC864 Hardware User Guide
GC864-PY, GC864-QUAD
1vv0300733 Rev. 0 - 12/06/06

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Summary of Contents for Telit Wireless Solutions GC864

  • Page 1 GC864 Hardware User Guide GC864-PY, GC864-QUAD 1vv0300733 Rev. 0 - 12/06/06...

  • Page 2: Table Of Contents

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 Contents Overview ...........................4 Hardware Commands ......................5 Turning ON the GC864 ......................5 Turning OFF the GC864 ......................7 2.2.1 Hardware shutdown..........................7 Hardware Unconditional Reboot ...................7 Power Supply ........................9 Power Supply Requirements ....................9 General Design Rules ......................10 3.2.1...
  • Page 3 GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 Microphone buffering......................37 7.5.1 Buffered Balanced Mic........................37 7.5.2 Buffered Unbalanced (Single Ended) Microphone ............... 39 OUTPUT LINES (Speaker)....................42 Short description........................42 Output lines characteristics ....................43 General Design rules......................44 8.3.1 Noise Filtering ..........................44 Handset earphone design....................45...

  • Page 4: Overview

    Telit GC864 module. For further hardware details that may not be explained in this document refer to the Telit GC864 Product Description document where all the hardware information is reported. NOTICE (EN) The integration of the GC864 GSM/GPRS cellular module within user application shall be done according to the design rules described in this manual.

  • Page 5: Hardware Commands

    Hardware Commands 2.1 Turning ON the GC864 To turn on the GC864 the pad ON# must be tied low for at least 1 second and then released. The maximum current that can be drained from the ON# pad is 0,1 mA.
  • Page 6 GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 For example: 1- Let's assume you need to drive the ON# pad with a totem pole output of a +3/5 V microcontroller (uP_OUT1): 2- Let's assume you need to drive the ON# pad directly with an ON/OFF button: Reproduction forbidden without Telit Communications S.p.A.

  • Page 7: Turning Off The Gc864

    2.2.1 Hardware shutdown To turn OFF the GC864 the pad ON# must be tied low for at least 1 second and then released. The same circuitry and timing for the power on shall be used.
  • Page 8 GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 TIP: The unconditional hardware reboot should be always implemented on the boards and software should use it as an emergency exit procedure. For example: 1- Let's assume you need to drive the RESET# pad with a totem pole output of a +3/5 V microcontroller (uP_OUT2): Reproduction forbidden without Telit Communications S.p.A.

  • Page 9: Power Supply

    The power supply circuitry and board layout are a very important part in the full product design and they strongly reflect on the product overall performances, hence read carefully the requirements and the guidelines that will follow for a proper design. 3.1 Power Supply Requirements The GC864 power requirements are: • Nominal Supply Voltage: 3.8 V •...

  • Page 10: General Design Rules

    Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at least 10V. • A protection diode should be inserted close to the power input, in order to save the GC864 from power polarity inversion. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved...
  • Page 11 GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 An example of linear regulator with 5V input is: Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 11 of 68...

  • Page 12: Input Source Power Supply Design Guidelines

    • A protection diode should be inserted close to the power input, in order to save the GC864 from power polarity inversion. This can be the same diode as for spike protection. An example of switching regulator with 12V input is: Reproduction forbidden without Telit Communications S.p.A.

  • Page 13: Battery Source Power Supply Design Guidelines

    Make sure the low ESR capacitor (usually a tantalum one) is rated at least 10V. • A protection diode should be inserted close to the power input, in order to save the GC864 from power polarity inversion. Otherwise the battery connector should be done in a way to avoid polarity inversions when connecting the battery.
  • Page 14 5% or less. This last phase is not implemented in the GC864 internal charging algorithm, so that the battery once charged is left discharging down to a certain threshold so that it is cycled from full charge to slight discharge even if the battery charger is always inserted.

  • Page 15: Thermal Design Guidelines

    For the heat generated by the GC864, you can consider it to be during transmission 1W max during CSD/VOICE calls and 2W max during class10 GPRS upload.

  • Page 16: Power Supply Pcb Layout Guidelines

    • The Bypass low ESR capacitor must be placed close to the Telit GC864 power input pads or in the case the power supply is a switching type it can be placed close to the inductor to cut the ripple provided the PCB trace from the capacitor to the GC864 is wide enough to ensure a dropless connection even during the 2A current peaks.

  • Page 17: Antenna

    4.1 Antenna Requirements As suggested on the Product Description the antenna for a Telit GC864 device shall fulfill the following requirements: ANTENNA REQUIREMENTS...

  • Page 18: Antenna Installation Guidelines

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 4.3 Antenna installation Guidelines • Install the antenna in a place covered by the GSM signal. • The Antenna must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter;...

  • Page 19: Gc864 Pins Allocation

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 5 GC864 pins allocation GC864 uses an 80 pin Molex p.n. 53949-0878 male connector for the connections with the external applications. This connector matches the 54150-0878 model Signal Function Internal Type...
  • Page 20 Power Ω ON/OFF* Input command for switching power ON or OFF (toggle command). Pull up to VBATT The pulse to be sent to the GC864 must be equal or greater than 1 second. RESET* Reset input VRTC VRTC Backup capacitor...

  • Page 21: Note: Reserved Pins Must Not Be Connected

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 Signal Function Internal Type Pull up TGPIO_08 / CAM_ON I/O Telit GPIO8 Configurable GPIO / Camera Interface CMOS 2.8V TGPIO_06 / ALARM Telit GPIO6 Configurable GPIO / ALARM CMOS 2.8V TGPIO_23 Reserved to detect ON/OFF.

  • Page 22: Serial Port

    UART. The serial port on the GC864 is a +2.8V UART with all the 7 RS232 signals. It differs from the PC- RS232 in the signal polarity (RS232 is reversed) and levels. The levels for the GC864 UART are the...
  • Page 23 NOTE: According to V.24, RX/TX signal names are referred to the application side, therefore on the GC864 side these signal are on the opposite direction: TXD on the application side will be connected to the receive line (here named TXD/ rx_uart ) of the GC864 serial port and viceversa for RX.

  • Page 24: Rs232 Level Translation

    1vv0300733 Rev. 0 - 12/06/06 6.1 RS232 level translation In order to interface the Telit GC864 with a PC com port or a RS232 (EIA/TIA-232) application a level translator is required. This level translator must - invert the electrical signal in both directions - change the level from 0/3V to +15/-15V Actually, the RS232 UART 16450, 16550, 16650 &...
  • Page 25 GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 An example of level translation circuitry of this kind is: the RS232 serial port lines are usually connected to a DB9 connector with the following layout: Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved...

  • Page 26: Uart Level Translation

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 6.2 5V UART level translation If the OEM application uses a microcontroller with a serial port (UART) that works at a voltage different from 2.8 - 3V, then a circuitry has to be provided to adapt the different levels of the two sets of signals.
  • Page 27 GC864. Care must be taken to avoid latch-up on the GC864 and the use of this output line to power electronic devices shall be considered with care, especially for devices that generate spikes and noise such as level translators, digital ICs or microcontroller, failure in any of these condition can severely compromise the GC864 functionality.

  • Page 28: Audio Section Overview

    1vv0300733 Rev. 0 - 12/06/06 7 Audio Section Overview The Base Band Chip of the GC864 Telit Module provides two different audio blocks; both in transmit (Uplink) and in receive (Downlink) direction: “MT lines” should be used for handset function, “HF lines”...
  • Page 29 GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 EXTERNAL AMPLIFIER 3,3mV 0,33mV Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 29 of 68...

  • Page 30: Microphone Paths Characteristic And Requirements

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 7.1 Microphone paths characteristic and requirements TIP: being the microphone circuitry the more noise sensitive , its design and layout must be done with particular care. Both microphone paths are balanced and the OEM circuitry should be balanced designed to reduce the common mode noise typically generated on the ground plane.
  • Page 31 12/06/06 TIP: definition of the nominal sensitivity of the microphone lines . The nominal sensitivity of the microphone lines indicates the voltage level on the GC864 pins present during "normal spoken" conditions. For a handset , the "normal spoken” conditions take place when the talker mouth is 7cm far from the microphone ;...
  • Page 32 “Mic_HF” Level = 0,33* 10 * 3=1* 10 Hence in these conditions the signal level on the“Mic_HF” input pads of the GC864 is 10 dB (3 times) lower than the nominal, as suggested. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved...

  • Page 33: General Design Rules

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 7.2 General Design Rules There are several configurations for the audio paths, but the most effective difference is between balanced and unbalanced microphone configuration. It is highly recommended to keep the whole microphone path balanced even if this means having 2 wires connecting the microphone instead of one needed (plus ground) in the unbalanced case.

  • Page 34: Microphone Biasing

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 7.4 Microphone Biasing The electret microphones usually need a biasing voltage to work properly. Refer to your microphone provider for the characteristics required. NOTE: The microphones have a hot wire were the positive biasing must be connected. Usually it is indicated by a + symbol or a red point.

  • Page 35: Unbalanced Microphone Biasing

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 NOTE: The cable to the microphone should not be shielded, instead a twisted pair cable shall be used. NOTE: The microphone sensitivity changes with the value of R2 and R3. Usually the microphones are characterized with 2kΩ...
  • Page 36 GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 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 placed close to the MIC- pad (MIC_HF- or MIC_MT- depending on the audio path chosen) or if possible it should be placed close to the shielded cable connector.

  • Page 37: Microphone Buffering

    12/06/06 7.5 Microphone buffering As seen previously, a microphone shall be connected to the input pins of the GC864 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 solution.
  • Page 38 GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 The buffer gain is given by the formula: Gain The C636 and C637 capacitors are placed in order to cut off the gain at higher frequencies than the transmitted GSM band, the cutoff frequency (-3dB) should be 3500Hz in order to have -1dB at 3kHz.

  • Page 39: Buffered Unbalanced (Single Ended) Microphone

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 7.5.2 Buffered Unbalanced (Single Ended) Microphone . MIC+ 2,7nF GC864 MIC+ 6,8nF The above schematic can be used for a single ended (buffered unbalanced) microphone; the required biasing circuitry is not included. Note also that the capacitor C3 is not needed .
  • Page 40 GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 freq [Hz] π π 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. The 100nF capacitor C719 is needed to filter the noise that could be coupled to that divider.
  • Page 41 GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 As a consequence of the assigned values of the resistors, the nominal values of C726 and C727 are C726= 1/ (2π*4000*R719)= 7.10 *10 C727= 1/ (2π*4000*R711)= 2,65 *10 modified in 6,8nF (f =4181Hz ) and 2,7nF (f =3931Hz) because of commercial values .

  • Page 42: Output Lines (Speaker)

    OUTPUT LINES (Speaker) 8.1 Short description. The Telit GC864 provides two audio paths in receive section. Only one of the two paths can be active at a time, selectable by AXE hardware line or by AT command. You must keep in mind the different audio characteristics of the receive blocks when designing: the “Ear_MT”...

  • Page 43: Output Lines Characteristics

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 8.2 Output lines characteristics . “Ear_MT” Differential Line-out Drivers Path • line coupling: • line type: bridged • output load resistance : ≥ 14 Ω • internal output resistance: 4 Ω (typical) •...

  • Page 44: General Design Rules

    The three groups have different power requirements, usually the first two applications need only few mW of power, which can be directly drained from the GC864 pads, provided a suited speaker is used. This direct connect design is the cheaper and simpler solution and will be suited for the most of the earphone design requirements.

  • Page 45: Handset Earphone Design

    Again the output from the GC864 is bridged and both lines should be used, where possible, as inputs to the power amplifier. This ensures a higher common mode rejection ratio; reducing the GSM current busts noise on the speaker output.

  • Page 46: Hands-Free Earphone (Low Power) Design

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 The resulting gain and high pass cut can be obtained with the formula: Gain = freq [Hz] π And an example of internal Ear amplifier could be: +12dB GC864 Some amplifier require a low impedance load at high frequency in order to avoid auto oscillation, this can be made with a capacitor (100nF) in series with a resistor (15Ω).

  • Page 47: Car Kit Speakerphone Design

    The design of the amplifier shall comply with the following guidelines: • The input to the amplifier MUST be taken from the “Ear_HF” audio path of the GC864, because of its echo canceller parameters suited to a car cabin use.

  • Page 48: External Sim Holder

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 9 External SIM Holder Aim of this section is to give basic design guide lines to integrate a SIM holder in applications that uses Telit modules 9.1 SIM DESIGN GUIDES In all Telit modules there are five pins for SIM card holder connection...
  • Page 49 GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 When connection is not short, insertion of 10..100ohm resistor with 10..33pF capacitor (RC filter) is a good caution to improve EMI from SIMCLK line. Do not insert resistor on SIMVCC, SIMRST and SIMIO lines, their use is not supported by SIM electrical interface.

  • Page 50: General Purpose I/O

    Input pads can only be read and report the digital value (high or low) present on the pad at the read time; output pads can only be written or queried and set the value of the pad output; an alternate function pad is internally controlled by the GC864 firmware and acts depending on the function implemented.

  • Page 51: Using The Alarm Output Gpio_06/Alarm

    AT command. This output can be used to power up the GC864 controlling microcontroller or application at the alarm time, giving you the possibility to program a timely system wake-up to achieve some periodic actions and completely turn off either the application and the GC864 during sleep periods, drammatically reducing the sleep comsumption to few μA.

  • Page 52: Camera

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 11 Camera 11.1 Camera characteristics The GC864 module provides a direct support for digital cameras with the following characteristics: Type: TRANSCHIP TC5747 Technology: CMOS COLOR camera Max picture size: VGA 480x640 pixels landscape...
  • Page 53 GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 DOUT_7 DOUT_8 VCLKOUT VALIDH VALIDV VCC_MAIN_CAM External 2.8V Regulator enable DVDD28 controlled by CAM_PWR_ON CAM_SDA/IIC_SDA I/O I2C bus serial data SDIN Ground TGPIO_08/CAM_ON Camera power type selector Ground SHIELD Flash Enable LED_CTRL Filter the AVDD28.

  • Page 54: Evb For Transchip Camera Support

    11.1.5 EVB for Transchip camera support In order to interface the Telit GC864 module with a CMOS camera, Telit has developed an evaluation board (see Annex B). The EVK2 (see Annex A) allow connecting all Telit modules through 2 connectors of 40 pins each.

  • Page 55: Example Usage Script For Camera

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 11.1.6 Example usage script for camera Camera setting: (shown here are the defaults ones) >AT#CAMSEL=0 (camera selection: 0-auto, 2-transchip) >AT#CMODE=0 (camera mode: 0-day, 1-night) >AT#CAMQUA=0 (camera quality: 0-low, 1-medieum, 2-high) >AT#CAMRES=0 (camera resolution: 0-VGA, 1-QVGA, 2-QQVGA) >AT#CAMCOL=0...

  • Page 56: Conformity Assessment Issues

    12/06/06 12 Conformity Assessment Issues The GC864 module is assessed to be conform to the R&TTE Directive as stand-alone products, so If the module is installed in conformance with Dai Telecom installation instructions require no further evaluation under Article 3.2 of the R&TTE Directive and do not require further involvement of a R&TTE Directive Notified Body for the final product.

  • Page 57: Safety Recommandations

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 13 SAFETY RECOMMANDATIONS READ CAREFULLY Be sure the use of this product is allowed in the country and in the environment required. The use of this product may be dangerous and has to be avoided in the following areas:...

  • Page 58: Document Change Log

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 14 Document Change Log ISSUE#0 12/06/06 Release First ISSUE# 0 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 58 of 68...

  • Page 59: Annex A - Evk2 Schematics

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 Annex A – EVK2 schematics Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 59 of 68...
  • Page 60 PL106 9019915102410 R110 PL103 1984617PT1.5_2-3.5-H R111 +3.7V CHARGE CURRENT UNLIMITED 2:9B C105 CHARGER ON BATTERY CHARGER INPUT 4.7nF R112 R105 6 Vcc 0603 R113 SOT-323 ON_OFF* 0603 BCR185W 2:5E;2:9B R108 Q105 0603 M676 YELLOW SOT-23 +3.7V BC857B WARNING!!!! Q102 LY-M676-Q2S1-26 Care must be taken to ensure +3.7V DL101...
  • Page 61 +3.7V PL201 4731955140400 PL202 4731955140400 VBATT TX_TRACE TX_TRACE TRACE 3:3C RX_TRACE VBATT RX_TRACE 3:3C R206 IIC_SDA_HW 0402 VBATT IIC_SDA_HW 5:5D VBATT R202 IIC_SCL_HW 0402 IIC_SCL_HW 5:5D R205 0402 SSC0_CLK SSC0_CLK 5:11B R203 0402 SSC0_MTSR SSC0_MTSR 5:11B R204 SSC0_MRST 0402 SSC0_MRST 5:11B CHARGE CHARGE...
  • Page 62 +3.7V U302 JP302 LP2982AIM5X-3_0-NOPB V_IN V_OUT C302 ON-OFF* BYPASS 2.2uF 6.3V L20A MA05A 0603 C305 R304 C306 15nF 10uF CONT-A 0402 0402 U304 LDO_ON_OFF* MAX3237CAI+ 1:11B;6C;4:6E;5:2B;5:2D;5:8C SSOP-28 T1IN T1OUT T2IN T2OUT T3IN T3OUT T4IN T4OUT T5IN T5OUT R1OUTB R1OUT R1IN R2OUT R2IN R3OUT...
  • Page 63 noMount=YES noMount=YES noMount=YES +3.7V U401 JP403 LM4862MX-NOPB AUDIO Switch PL401 9019915102410 SHUTDOWN PL402 PL403 PL404 BYPASS 1215061-05F 1215061-05F 1215061-05F C403 C404 100nF 100nF 2:3C EAR_MT+ EAR_HF+ 2:3C 2:3C 0603 0603 EAR_MT- EAR_HF- C408 2:3C 2:3C MIC_MT+ MIC_HF+ 100nF 2:3D 2:3D noMount=YES MIC_MT- MIC_HF-...
  • Page 64 3.3V_HUB X501 NX1255GB 6.000MHz C503 U504 100nF 74AHC1GU04DCKRG4 0402 3.3V_HUB CP12A R516 R515 1.5K 74AHC1GU04DCKRG4 0402 0402 U504 XTIN_FT2232 U506 3D;9C LP2982AIM5X-3_3 TP502 3.3V_HUB +5V_USB V_OUT V_IN R510 +5V_USB noMount=YES C516 SO501 1.5K C512 2.2uF USBE-004 PL502 C513 100nF BYPASS ON-OFF* JP501 9019915102410...

  • Page 65: Annex B - Camera Evb Schematics

    GC864 Hardware User Guide 1vv0300733 Rev. 0 - 12/06/06 Annex B - Camera EVB schematics Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 65 of 68...
  • Page 66 SO101 SO102 4779723130417 4779723130417 PD[2] CAM_PWR_ON/AGILENT CAM_SYNC/AGILENT TC5747MF24L MON1/CAM_CLK TGPIO_08/CAM_ON TGPIO_09/CAM_RST CAM_DRDY/AGILENT VCC_MAIN_CAM PD[0] R110 R111 PD[1] PD[7] PD[5] CAM_SDA/IIC_SDA 0402 0402 5D;6B CAM_SCL/IIC_SCL SO105 52437–2472 JP112 VAUX1 SCLK JP105 CAM_SCL/IIC_SCL AGND PD[6] AVDD28 JP106 RESET_N JP114 TGPIO_09/CAM_RST CLK_IN JP107 CAM_M_CLK 10D;5A DGND...
  • Page 67 MODIFY DATE DESCRIPTION PATH /Archivio_PCB/cs1170 cs1170 FILE NAME cs1170 FILE GERBER I2CBUS DUAL CAMERA ANNOTATION FORM Mod. 048 Rev.0 6/99 Silkscreen side A Project by Project SHEET N. OF SHEETS DRAWING CODE Drawn by: Pasqualini Natascia 06/09/2005 CS1170.SM 0276 Verif. by...
  • Page 68 MODIFY DATE DESCRIPTION PATH /Archivio_PCB/cs1170 cs1170 FILE NAME cs1170 FILE GERBER I2CBUS DUAL CAMERA ANNOTATION FORM Mod. 048 Rev.0 6/99 Silkscreen side B Project by Project SHEET N. OF SHEETS DRAWING CODE Drawn by: Pasqualini Natascia 06/09/2005 CS1170.SM 0276 Verif. by...

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