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GE863-QUAD
GE863-PY
Hardware User Guide
1vv0300715 Rev. 1 - 19/09/06
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 Contents 1 Overview ...........................................................................................................................6 2 GE863 module connections ............................................................................................7 2.1 PIN-OUT...................................................................................................................................7 2.2 PINS LAYOUT
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 7.4 Microphone Biasing ................................................................................................................36 7.4.1 Balanced Microphone Biasing ....................................................................................................... 36 7.4.2 Unbalanced Microphone Biasing...................................................................................................37 7.5 Microphone
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 12 Camera............................................................................................................................60 12.1 Transchip Camera ..............................................................................................................60 12.1.1 Camera Interface Connectors........................................................................................................ 61 12.1.2 EVB for Tr
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 This document is relating to the following products: GE863-QUAD Pb free 3 990 250 662 GE863-PY Pb free 3 990 250 661 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 5 of 79
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 1 Overview The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GE863-QUAD/PY module. In this document all the basic functions of a mobile phone will be taken into account; for each one of them a proper hardware solution will be suggested and eventually the wrong solutions and common errors to be avoided will be evidenced. Obviously this document cannot embrace
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 2 GE863 module connections 2.1 PIN-OUT Pin Signal I/O Function Internal Type Pull up 1 GPIO13 I/O GPIO13 CMOS 2.8V 2 GPIO12 I/O GPIO12 CMOS 2.8V 3 GPIO11 I/O GPIO11 CMOS 2.8V 4 GPIO10 I/O GPIO10 CMOS 2.8V 5 GPIO9 / I/O GPIO9 / CAM_RST (2) CMOS 2.8V CAM_RST 6 GPIO8 / I/O GPIO8 / CAM_ON (2) CMOS 2.8V CAM_ON 7 CAM_CLK I/O Camera clock (2) CMOS 2.8V 8 GND - Ground Power 9 EAR_MT- AO Handset earphone signal
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 Pin Signal I/O Function Internal Type Pull up 28 GND - Ground Power 29 STAT_LED O Status indicator led CMOS 1.8V 30 AXE I Handsfree switching CMOS 2.8V 100KΩ 31 VAUX1 - Power output for external accessories (camera) - 32 GPIO4 / I/O GPIO4 Configurable general purpose I/O pin / CMOS 2.8V CAM_SDA Camera IIC interface (2) GPIO2 / JDR I/O GPIO2 Configurable general purpose I/O pin / CMOS 2.8V 33 Jammer Detect Output
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 Pin Signal I/O Function Internal Type Pull up 59 GPIO17 I/O GPIO CMOS 2.8V 60 GPIO14 I/O GPIO - 61 RESERVED - RESERVED - 62 RESERVED - RESERVED - 63 DAC_OUT O DAC out 64 GPIO16 I/O GPIO CMOS 2.8V 65 RESERVED - RESERVED - 66 RESERVED - RESERVED - 67 GND - Ground Power 68 RESERVED - RESERVED - 69 GND - Ground Power 70 ADC_IN3 AI Analog / Digital converter input - 71 GPIO15 I/O GPIO - 72 GND - Ground
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 2.2 PINS LAYOUT Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 10 of 79
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 3 Hardware Commands 3.1 Turning ON the GE863-QUAD/PY To turn on the GE863-QUAD/PY 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. A simple circuit to do it is: ON# R1 Q1 Power ON impulse R2 GND 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 proble
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 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: 3.2 Turning OFF the GE863-QUAD/PY The turning off of the device can be done in two ways: Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 12 of 79
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 • by software command (see GE863-QUAD/PY Software User Guide) • by hardware shutdown When the device is shut down by software command or by hardware shutdown, it issues to the network a detach request that informs the network that the device will not be reachable any more. 3.2.1 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 t
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 NOTE: don't use any pull up resistor on the RESET# line nor any totem 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 collector configuration. TIP: The unconditional hardware reboot should be always implemented on the boards and software should use it as an emergency exit
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 4 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. 4.1 Power Supply Requirements The GE863-QUAD/PY power requirements are: • Nominal Supply Voltage: 3.8 V • Max Supply Voltage: 4.2 V • Supply v
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 4.2 General Design Rules The principal guidelines for the Power Supply Design embrace three different design steps: - the electrical design - the thermal design. - the PCB layout. 4.2.1 Electrical design Guidelines The electrical design of the power supply depends strongly from the power source where this power is drained. We will distinguish them into three categories: • +5V input (typically PC internal regulator out
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 An example of linear regulator with 5V input is: 4.2.1.2 + 12V input Source Power Supply Design Guidelines • The desired output for the power supply is 3.8V, hence due to the big difference between the input source and the desired output, a linear regulator is not suited and shall not be used. A switching power supply will be preferable because of its better efficiency especially with the 2A peak current load re
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 An example of switching regulator with 12V input is: 4.2.1.3 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 GE863-QUAD/PY 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
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 4.2.1.4 Battery Charge control Circuitry Design Guidelines The charging process for Li-Ion Batteries can be divided into 4 phases: • Qualification and trickle charging • Fast charge 1 - constant current • Final charge - constant voltage or pulsed charging • Maintenance charge The qualification process consists in a battery voltage measure, indicating roughly its charge status. If the battery is deeply discharged, that me
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GE863-QUAD GE863-PY 1vv0300715 Rev. 1 - 19/09/06 As you can see, the charging process is not a trivial task to be done; moreover all these operations should start only if battery temperature is inside a charging range, usually 5°C - 45°C. The GE863-QUAD/PY measures the temperature of its internal component, in order to satisfy this last requirement, it's not exactly the same as the battery temperature but in common application the two temperature should not differ too mu
