Telit Wireless Solutions manual UC864-E Hardware User Guide

Page 36

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

NOTE: The UART input line TXD (rx_uart) of UC864-E 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 may be required.

A power source of the internal interface voltage corresponding to the 2.6V CMOS high level is available at the PWRMON pin on the connector, whose absolute maximum output current is 1mA.

A maximum of 9 resistors of 47 KΩ pull-up can be connected to the PWRMON pin, provided no other devices are connected to it and the pulled-up lines are UC864-E input lines connected to open collector outputs in order to avoid latch-up problems on UC864-E.

Care must be taken to avoid latch-up on UC864-E and the use of this output line to power electronic devices shall be avoided, especially for devices that generate spikes and noise such as switching level translators, micro controllers, failure in any of these condition can severely compromise the UC864-E functionality.

NOTE: The input lines working at 2.6VCMOS can be pulled-up with 47KΩ resistors that can be connected directly to the PWRMON line provided they are connected as in this example.

NO OTHER devices than those suggested should be powered with the PWRMON line; otherwise the module functionality may be compromised.

It is important to consider that the added circuit must have consumption lower than 1mA.

In case of reprogramming of the module has to be considered the use of the RESET line to start correctly the activity.

The preferable configuration is having an external supply for the buffer.

Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved

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Contents UC864 Hardware User Guide UC864-E Hardware User Guide This document is relating to the following productsContents 10.3 10.411.1 11.2Disclaimer Overview Mechanical Dimensions Length 36.2 mm Width 30 mm Thickness 8mmUC864-E module connections PIN-OUTCmos Reserved 1 UC864-E Antenna connector Pin Signal FunctionHardware Commands Turning on the UC864-E10k Turning OFF the UC864-E Hardware shutdownHardware Unconditional Restart 10k +1.8 Power Supply Power Supply RequirementsUC864-E Hardware User Guide General Design Rules Electrical Design Guidelines1.2 + 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 Antenna RequirementsAntenna Installation Guidelines Logic level specifications Absolute Maximum Ratings -Not FunctionalOperating Range Interface levels Operating Range Interface levels 1.8V CmosReset signal Serial Ports Absolute Maximum Ratings Not FunctionalSignals 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 USB Port Communication ports combinationsAudio Section Overview GeneralityDefinitions SelectionElectrical Characteristics Input lines microphoneOutput lines speaker EarMT BuffersGeneral Purpose I/O NotLogic level specifications Using a Gpio Pad as Input Using a Gpio Pad as OutputUsing the Alarm Output GPIO6 Using the Buzzer Output GPIO7 Indication of network service availability LED status Device StatusVAUX1 power output Operating Range VAUX1 power supplyRTC Bypass out Mounting UC864-E on your board Debug of the UC864-E in production USB Vbus UsbidConformity Assessment Issues Safety Recommandations Document Change Log Revision Date Changes
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