Telit Wireless Solutions UC864-G Hardware User's Manual
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Telit Wireless Solutions UC864-G Hardware User's Manual

Telit Wireless Solutions UC864-G Hardware User's Manual

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UC864-G Hardware User Guide
- 29/10/07
DRAFT

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Summary of Contents for Telit Wireless Solutions UC864-G

  • Page 1 UC864-G Hardware User Guide - 29/10/07 DRAFT...
  • Page 2 UC864-G Hardware User Guide DRAFT - 29/10/07 This document is relating to the following products: UC864-G Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 2 of 66...

  • Page 3: Table Of Contents

    - 29/10/07 Contents Overview ...........................7 Mechanical Dimensions....................8 UC864-G module connections ..................9 PIN-OUT...........................9 3.1.1 UC864-G Antenna connector ......................12 Hardware Commands ....................13 Turning ON the UC864-G .....................13 Turning OFF the UC864-G ....................15 4.2.1 Hardware shutdown........................... 15 4.2.2 Hardware Unconditional Restart......................15 Power Supply .........................17...
  • Page 4 Description ............................. 63 13.2.2 Using ADC Converter ........................63 13.3 Mounting UC864-G on your board ..................64 13.3.1 Debug of the UC864-G in production .................... 65 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 4 of 66...
  • Page 5 UC864-G Hardware User Guide DRAFT - 29/10/07 14 Document Change Log ....................66 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 5 of 66...
  • Page 6 UC864-G Hardware User Guide DRAFT - 29/10/07 DISCLAIMER The information contained in this document is the proprietary information of Telit Communications S.p.A. and its affiliates (“TELIT”). The contents are confidential and any disclosure to persons other than the officers, employees, agents or subcontractors of the owner or licensee of this document, without the prior written consent of Telit, is strictly prohibited.

  • Page 7: Overview

    Telit UC864-G Product Description document where all the hardware information is reported.

  • Page 8: Mechanical Dimensions

    UC864-G Hardware User Guide DRAFT - 29/10/07 2 Mechanical Dimensions Telit UC864-G module overall dimensions are: • Length: 45 mm • Width: 30 mm • Thickness: 4.8mm Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 8 of 66...

  • Page 9: Uc864-G Module Connections

    UC864-G Hardware User Guide DRAFT - 29/10/07 3 UC864-G module connections PIN-OUT UC864-G uses an 80 pin Molex p.n. 53949-0878 male connector for the connections with the external applications. This connector matches the 54150-0878 models Internal Type Signal Function Pull up...
  • Page 10 UC864-G Hardware User Guide DRAFT - 29/10/07 Internal Type Signal Function Pull up UC864-E TX_TRACE TX Data for debug monitor CMOS 2.6V Prog. / Data + Hw Flow Control C103/TXD Serial data input (TXD) from DTE CMOS 2.6V C104/RXD Serial data output to DTE CMOS 2.6V...
  • Page 11 UC864-G Hardware User Guide DRAFT - 29/10/07 Internal Type Signal Function Pull up UC864-E TGPIO_20 I/O Telit GPIO20 Configurable GPIO CMOS 2.6V TGPIO_04 I/O Telit GPIO4 Configurable GPIO CMOS 2.6V TGPIO_14 I/O Telit GPIO14 Configurable GPIO CMOS 2.6V TGPIO_15 I/O Telit GPIO15 Configurable GPIO CMOS 2.6V...

  • Page 12: Uc864-G Antenna Connector

    UC864-G Hardware User Guide DRAFT - 29/10/07 NOTE: If not used, almost all pins should be left disconnected. The only exceptions are the following pins: Signal Function VBATT Main power supply VBATT Main power supply VBATT Main power supply VBATT...

  • Page 13: Hardware Commands

    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 UC864-G power regulator and improper power on/off of the module. The line ON# must be connected only in open collector configuration.
  • Page 14 UC864-G Hardware User Guide DRAFT - 29/10/07 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 15: Turning Off The Uc864-G

    The same circuitry and timing for the power on shall be used. The device shuts down after the release of the ON# pad. NOTE: To turn OFF UC864-G, first of all, you MUST cut off supplying power to the USB_VBUS, or the module does not turn off TIP: To check if the device has powered off, the hardware line PWRMON should be monitored.
  • Page 16 NOTE: Do not use any pull up resistor on the RESET# line or any totem pole digital output. Using pull up resistor may bring to latch up problems on the UC864-G power regulator and improper functioning of the module. The line RESET# must be connected only in open collector configuration.

  • Page 17: 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. Power Supply Requirements The UC864-G power requirements are: • Nominal Supply Voltage: 3.8 V •...

  • Page 18: 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 UC864-G from power polarity inversion. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved...

  • Page 19: Input Source Power Supply Design Guidelines

    • A protection diode should be inserted close to the power input, in order to save UC864-G from power polarity inversion. This can be the same diode as for spike protection. An example of switching regulator with 12V input is in the below schematic (it is split in 2 parts): Reproduction forbidden without Telit Communications S.p.A.
  • Page 20 UC864-G Hardware User Guide DRAFT - 29/10/07 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 20 of 66...

  • Page 21: Battery Source Power Supply Design Guidelines

    • The desired nominal output for the power supply is 3.8V and the maximum voltage allowed is 4.2V, hence a single 3.7V Li-Ion cell battery type is suited for supplying the power to the Telit UC864-G module. The three cells Ni/Cd or Ni/MH 3.6 V Nom. battery types or 4V PB types MUST NOT BE USED DIRECTLY since their maximum voltage can rise over the absolute maximum voltage for UC864- G and damage it.
  • Page 22 NOTE: For all the threshold voltages, inside UC864-G, all thresholds are fixed in order to maximize Li-Ion battery performances and do not need to be changed.

  • Page 23: Thermal Design Guidelines

    For the heat generated by the UC864-G, you can consider it to be during transmission 1W max during CSD/VOICE calls and 2W max during class12 GPRS upload.

  • Page 24: Power Supply Pcb Layout Guidelines

    • The Bypass low ESR capacitor must be placed close to the Telit UC864-G 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 UC864-G is wide enough to ensure a drop-less connection even during the 2A current peaks.

  • Page 25: Antenna

    RF exposure compliance. OEM integrators must ensure that the end user has no manual instructions to remove or install the UC864-G module. Antennas used for this OEM module must not exceed 3dBi gain for mobile and fixed operating configurations.

  • Page 26: Gsm/Wcdma Antenna - Installation Guidelines

    This device is to be used only for mobile and fixed application. GPS Antenna - Installation Guidelines The UC864-G due to its characteristics of sensitivity is capable to perform a Fix inside the buildings. (In any case the sensitivity could be affected by the building characteristics i.e. shielding) The Antenna must not be co-located or operating in conjunction with any other antenna or transmitter.

  • Page 27: Logic Level Specifications

    UC864-G Hardware User Guide DRAFT - 29/10/07 7 Logic level specifications Where not specifically stated, all the interface circuits work at 2.6V CMOS logic levels. The following table shows the logic level specifications used in the Telit UC864-G interface circuits: For 2.6V CMOS signals:...

  • Page 28: Reset Signal

    It may only be used to reset a device already on that is not responding to any command. NOTE: do not use this signal to power off UC864-G. Use the ON/OFF signal to perform this function or the AT#SHDN command.

  • Page 29: Serial Ports

    The only configuration that doesn't need a level translation is the 2.8V UART. The serial port on UC864-G is a +2.6V 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 UC864-G UART are the...
  • Page 30 NOTE: According to V.24, RX/TX signal names are referred to the application side, therefore on the UC864-G 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 UC864-G serial port and vice versa for RX.

  • Page 31: Rs232 Level Translation

    DRAFT - 29/10/07 RS232 level translation In order to interface the Telit UC864-G 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 32 UC864-G Hardware User Guide DRAFT - 29/10/07 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 Rights Reserved...

  • Page 33: Uart Level Translation

    TIP: This logic IC for the level translator and 2.8V pull-ups (not the 5V one) can be powered directly from PWRMON line of UC864-G. Note that the TC7SZ07AE has open drain output; therefore the resistor R2 is mandatory. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved...
  • Page 34 - 29/10/07 NOTE: The UART input line TXD (rx_uart) of UC864-G is NOT internally pulled up with a resistor, so there may be the need to place an external 47KΩ pull-up resistor, either the DTR (dtr_uart) and RTS (rts_uart) input lines are not pulled up internally, so an external pull-up resistor of 47KΩ...

  • Page 35: Usb Port

    UC864-G includes an integrated universal serial bus (USB) transceiver, compliant with USB 2.0 specification, for interfacing UC864-G to a computer as a USB peripheral or connecting the UC864-G to other peripherals. It supports the USB low-speed (1.5 Mbits/s) and full-speed (12 Mb/s) modes. In HSDPA (High Speed download Packet Access) mode, the downlink data speed rates up to 7.2Mbps.

  • Page 36: Audio Section Overview

    DRAFT - 29/10/07 10 Audio Section Overview The Base Band Chip of the UC864-G 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” is suited for hands -free function (car kit).

  • Page 37: Microphone Paths Characteristic And Requirements

    UC864-G Hardware User Guide DRAFT - 29/10/07 10.1 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 38 - 29/10/07 TIP: Definition of the nominal sensitivity of the microphone lines. The nominal sensitivity of the microphone lines indicates the voltage level on the UC864-G 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 39 MicVoltage = 10 = 0,33* 10 Setting the “microphone gain” at +10dB (3 times), the signal in the nominal conditions on the “Mic_HF” inputs s of UC864-G Telit Module will be: “Mic_HF” Level = 0,33* 10 * 3=1* 10 Hence in these conditions the signal level on the“Mic_HF” input pads of UC864-E is 10 dB (3 times) lower than the nominal, as suggested.

  • Page 40: Draft

    UC864-G Hardware User Guide DRAFT - 29/10/07 10.2 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 41: Microphone Biasing

    UC864-G Hardware User Guide DRAFT - 29/10/07 10.4 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 42: Unbalanced Microphone Biasing

    UC864-G Hardware User Guide DRAFT - 29/10/07 NOTE: In the balanced application the resistors R2 and R3 must have the same value to keep the circuit balanced. NOTE: The cable to the microphone should not be shielded, instead a twisted pair cable shall be used.
  • Page 43 UC864-G Hardware User Guide DRAFT - 29/10/07 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 44: Microphone Buffering

    - 29/10/07 10.5 Microphone Buffering As seen previously, a microphone shall be connected to the input pins of UC864-G 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 45 UC864-G Hardware User Guide DRAFT - 29/10/07 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 46: Buffered Unbalanced (Single Ended) Microphone

    UC864-G Hardware User Guide DRAFT - 29/10/07 10.5.2 Buffered Unbalanced (Single Ended) Microphone GE863 Mic+ 2,7nF GE863 GE863 M ic- 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 47 UC864-G Hardware User Guide DRAFT - 29/10/07 [Hz] freq 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 48 UC864-G Hardware User Guide DRAFT - 29/10/07 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 . Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved...

  • Page 49: Output Lines (Speaker)

    11 OUTPUT LINES (Speaker) 11.1 Short description The Telit UC864-G 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 50: Output Lines Characteristics

    UC864-G Hardware User Guide DRAFT - 29/10/07 11.2 Output Lines Characteristics UC864-G; “Ear_MT” Differential output path • line coupling: • line type: differential • output load resistance : 32 Ω • max. load capacitance 500pF(max.) • differential output impedance: 1 Ω (max) @1.02KHz •...

  • Page 51: 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 UC864-G 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 52: Handset Earphone Design

    This ensures a higher common mode rejection ratio, reducing the GSM current busts noise on the speaker output. In this case the “EAR_MT” lines from the UC864-G should be AC coupled with a ceramic capacitor of 100nF (or bigger).

  • Page 53: Hands-Free Earphone (Low Power) Design

    UC864-G Hardware User Guide DRAFT - 29/10/07 The resulting gain and high pass cut can be obtained with the formula: Gain = [Hz] freq π And an example of internal Ear amplifier could be: +12dB UC864-E 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 54: 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 UC864-G, because of its echo canceller parameters suited to a car cabin use. •...

  • Page 55: 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 UC864-G firmware and acts depending on the function implemented.

  • Page 56: Logic Level Specifications

    UC864-G Hardware User Guide DRAFT - 29/10/07 12.1 Logic level specifications Where not specifically stated, all the interface circuits work at 2.6V CMOS logic levels. The following table shows the logic level specifications used in the UC864-G interface circuits: Absolute Maximum Ratings -Not Functional...

  • Page 57: Using A Gpio Pad As Input

    TX burst. 12.5 Using the Alarm Output GPIO6 The GPIO6 pad, when configured as Alarm Output, is controlled by the UC864-G module and will rise when the alarm starts and fall after the issue of a dedicated AT command.

  • Page 58: Using The Buzzer Output Gpio7

    NOTE: During RESET the line is set to HIGH logic level. 12.6 Using the Buzzer Output GPIO7 The GPIO7 pad, when configured as Buzzer Output, is controlled by the UC864-G module and will drive with appropriate square waves a Buzzer driver.

  • Page 59: Indication Of Network Service Availability

    12.7 Indication of network service availability The STAT_LED pin status shows information on the network service availability and Call status. In the UC864-G modules, the STAT_LED usually needs an external transistor to drive an external LED. Therefore, the status indicated in the following table is reversed with respect to the pin status.

  • Page 60: Rtc Bypass Out

    UC864-G Hardware User Guide DRAFT - 29/10/07 12.8 RTC Bypass out The VRTC pin brings out the Real Time Clock supply, which is separate from the rest of the digital part, allowing having only RTC going on when all the other parts of the device are off.

  • Page 61: Dac And Adc Section

    UC864-G Hardware User Guide DRAFT - 29/10/07 13 DAC and ADC section 13.1 DAC Converter(TBD) 13.1.1 Description UC864-G module provides a Digital to Analog Converter. The signal (named DAC_OUT) is available on pin 40 of the UC864-G module and on pin 17 of PL102 on EVK2 Board (CS1203).

  • Page 62: Low Pass Filter Example

    UC864-G Hardware User Guide DRAFT - 29/10/07 13.1.1 Low Pass Filter Example Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 62 of 66...

  • Page 63: Adc Converter

    Resolution <11 The UC864-G module provides 3 Analog to Digital Converters. The input lines are: ADC_IN1 available on Pin 37 and Pin 19 of PL102 on EVK2 Board (CS1203). ADC_IN2 available on Pin 38 and Pin 20 of PL102 on EVK2 Board (CS1203).

  • Page 64: Mounting Uc864-G On Your Board

    The position of the Molex board to board connector and the pin 1 are shown in the following picture. MOVABLE RF(GPS) MOVABLE RF(GSM/WCDMA) NOTE: metal tabs present on UC864-G should be connected to GND Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 64 of 66...

  • Page 65: Debug Of The Uc864-G In Production

    13.3.1 Debug of the UC864-G in production To test and debug the mounting of the UC864-G, we strongly recommend to foreseen test pads on the host PCB, in order to check the connection between the UC864-G itself and the application and to test the performance of the module connecting it with an external computer.
  • Page 66 UC864-G Hardware User Guide DRAFT - 29/10/07 14 Document Change Log DRAFT 29/10/07 Regulatory Notices This device is compliant with Parts 15, 22 and 24 of the FCC Rules. Operation of this device is subject to the following two conditions: 1.

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