Telit Wireless Solutions GE863-QUAD, GE863-PY manual General Purpose I/O, Using a Gpio Pad as Input

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GE863-QUAD

GE863-PY

1vv0300715 Rev. 1 - 19/09/06

10 General Purpose I/O

The general purpose I/O pads can be configured to act in three different ways:

-input

-output

-alternate function (internally controlled)

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 GE863-QUAD / PY firmware and acts depending on the function implemented.

Not all GPIO pads support all these three modes:

-GPIO5 supports all three modes and can be input, output, RFTX monitor output (Alternate function)

-GPIO6 supports 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 their interface levels are the same specified in the paragraph 5 .

10.1 Using a GPIO Pad as INPUT

The GPIO pads, when used as inputs, can be connected to a digital output of another device and report its status, provided this device has interface levels compatible with the 2.8V CMOS levels of the GPIO.

If the digital output of the device to be connected with the GPIO input pad has interface levels different from the 2.8V CMOS, then it can be connected to GPIO1 or can be buffered with an open collector transistor, provided a 47KΩ pull-up resistor is connected as seen in the paragraph 6.4 5V UART level translation.

10.2 Using a GPIO Pad as OUTPUT

The GPIO pads, when used as outputs, can drive 2.8V CMOS digital devices or compatible hardware. When set as outputs, the pads have a push-pull output and therefore the pull-up resistor may be omitted.

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Contents GE863-QUAD GE863-PY Hardware User Guide Contents 10.4 10.110.2 10.313.1 12.113.2 This document is relating to the following products Overview PIN-OUT GE863 module connectionsPin Signal Function Internal Type Pull up Pin Signal Function Internal Type Pins Layout Turning on the GE863-QUAD/PY Hardware CommandsTurning off of the device can be done in two ways Turning OFF the GE863-QUAD/PYHardware shutdown Hardware Unconditional RebootGE863-QUAD 1Power Supply Requirements Power SupplyGE863-QUAD/PY power requirements are Electrical design Guidelines 2General Design RulesAn example of linear regulator with 5V input is 1.2 + 12V input Source Power Supply Design GuidelinesAn example of switching regulator with 12V input is Battery Source Power Supply Design GuidelinesBattery Charge control Circuitry Design Guidelines Thermal Design Guidelines Power Supply PCB layout Guidelines GSM Antenna Requirements AntennaSerial Ports GSM Antenna installation GuidelinesGSM Antenna PCB line Guidelines Level Min Max Absolute Maximum Ratings -Not Functional Parameter Min MaxClear to Send Output from the GE863-QUAD/PY that Signals in the Uart connector on the EVK areNumber Pad Number 17-28-36 Ground 45-48-50-562MODEM Serial Port 2 Python Debug It is available on the following pins3RS232 level translation An example of level translation circuitry of this kind is 5V Uart level translation GE863-QUAD Audio Section Overview GM863-GPS + 20dB Microphone Paths Characteristic and RequirementsEcho canceller type Handset Echo canceller type Car kit hands-freeYou can set GA= +20dB to use standard resistor values That meansTIP environment consideration Other considerations General Design RulesBalanced Microphone Biasing Microphone BiasingUnbalanced Microphone Biasing GE863-QUAD Buffered Balanced Mic Microphone BufferingSample circuit can be Buffer gain is given by the formula Gain = RR604605 = RR607606Buffered Unbalanced Single Ended Microphone Buffer bandwidth at -3dB shall be 4KHz Freq . = 2π * R719* C726 2π * R711* C727GE863-QUAD Short description Output Lines SpeakerSW volume level step Number of SW volume steps Output Lines CharacteristicsNoise Filtering Handset Earphone Design An example of internal Ear amplifier could be Hands-Free Earphone Low Power DesignCar Kit Speakerphone Design Short Description Evaluation Kit for Telit Modules EVK2@ 350mW 2 EVK2 Audio Lines CharacteristicsESD Data IntegritySIM Supply SchematicLayout Using a Gpio Pad as Output Using a Gpio Pad as InputGeneral Purpose I/O Using the Buzzer Output GPIO7 10.3Using the Alarm Output GPIO6Min Max Units DAC and ADC section11.1DAC Converter DescriptionLow Pass Filter Example An AT command is available to use the DAC functionCommand is AT#DAC=enable,value Enabling DACInput Voltage range AD conversion Bits Resolution Using ADC Converter11.2ADC Converter Sensitivity Lux Camera12.1Transchip Camera TypeCamera Interface Connectors Camera Physical Detail & Connector Camera Socket Connector Camera Board Module Main Block Diagram for supported cameras Schematic Diagrams for supported camera Example usage script for camera Camera setting shown here are the defaults onesTaking an reading a photo Mounting the GE863-QUAD / PY on the Application Board 13.2Module Finishing & Dimensions13.1General Lead-free Alloy Surface finishing Ni/Au for all test padsRecommended foot print for the application Stencil Debug of the GE863 in ProductionPCB pad Design Solder paste Following is the recommended solder reflow profile 13.2.6 GE863-QUAD / PY Solder ReflowGE863-QUAD Section A-A Packing SystemModules orientation on tray Moisture Sensibility Conformity Assessment Issues Safety Recommandations 19/09/06 Document Change LogRevision Date Changes 21/02/06