Telit Wireless Solutions UC864 manual Using a Gpio Pad as Input, Using a Gpio Pad as Output

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UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

11.2 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 2.6V CMOS levels of the GPIO.

NOTE: If the digital output of the device to be connected with the GPIO input pad has interface levels different from the 2.6V CMOS, it can be buffered with an open collector transistor, provided a 47KΩ pull-up resistor is connected as seen in the paragraph 0

11.3 Using a GPIO Pad as OUTPUT

The GPIO pads, when used as outputs, can drive 2.6V 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.

11.4 Using the Alarm Output GPIO6

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

This output can be used to power up the UC864-E 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 UC864-E during sleep periods, dramatically reducing the sleep consumption to few μA.

In battery-powered devices this feature will greatly improve the autonomy of the device.

NOTE: During RESET the line is set to HIGH logic level.

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Contents UC864 Hardware User Guide This document is relating to the following products UC864-E Hardware User GuideContents 11.2 10.310.4 11.1Disclaimer Overview Length 36.2 mm Width 30 mm Thickness 8mm Mechanical DimensionsPIN-OUT UC864-E module connectionsCmos Reserved Pin Signal Function 1 UC864-E Antenna connectorTurning on the UC864-E Hardware Commands10k Hardware shutdown Turning OFF the UC864-EHardware Unconditional Restart 10k +1.8 Power Supply Requirements Power SupplyUC864-E Hardware User Guide Electrical Design Guidelines General Design Rules1.2 + 12V input Source Power Supply Design Guidelines UC864-E Hardware User Guide Battery Source Power Supply Design Guidelines UC864-E Hardware User Guide Thermal Design Guidelines Power Supply PCB layout Guidelines Antenna Requirements AntennaAntenna Installation Guidelines Operating Range Interface levels 1.8V Cmos Logic level specificationsAbsolute Maximum Ratings -Not Functional Operating Range Interface levelsReset signal Absolute Maximum Ratings Not Functional Serial PortsSignals of the UC864-E serial port are RS232 level translation UC864-E Hardware User Guide UC864-E Hardware User Guide 5V Uart level translation UC864-E Hardware User Guide Communication ports combinations USB PortSelection Audio Section OverviewGenerality DefinitionsInput lines microphone Electrical CharacteristicsEarMT Buffers Output lines speakerNot General Purpose I/OLogic level specifications Using a Gpio Pad as Output Using a Gpio Pad as InputUsing the Alarm Output GPIO6 Using the Buzzer Output GPIO7 LED status Device Status Indication of network service availabilityOperating Range VAUX1 power supply VAUX1 power outputRTC Bypass out Mounting UC864-E on your board USB Vbus Usbid Debug of the UC864-E in productionConformity Assessment Issues Safety Recommandations Revision Date Changes Document Change Log