Telit Wireless Solutions UC864 manual RTC Bypass out, VAUX1 power output

Page 46

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

11.7RTC 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.

To this power output a backup capacitor can be added in order to increase the RTC autonomy during power off of the battery.

 

Parameter

 

 

Symbol

 

 

 

Limit Values

 

 

 

Unit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

min.

 

 

 

typ.

max.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input Voltage

 

 

 

VRTC

 

 

 

1.50

 

 

 

3.0

 

3.25

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input current, Xtal ON

 

 

 

IRTC

 

 

 

 

 

 

 

1.1

 

 

 

 

uA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE: NO Devices must be powered from this pin.

11.8 VAUX1 power output

A regulated power supply output is provided in order to supply small devices from the module. This output is active when the module is ON and goes OFF when the module is shut down. The operating range characteristics of the supply are:

Operating Range – VAUX1 power supply

Output voltage

Output current

Output bypass capacitor

Min Typical

2.75V 2.85V

Max

2.95V

100mA

2.2μF

NOTE: During RESET and POWER ON the VAUX line is OFF

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

page 46 of 51

Page 45 Page 47
Image 46
Page 45 Page 47
Contents UC864 Hardware User Guide UC864-E Hardware User Guide This document is relating to the following productsContents 11.1 10.310.4 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 Operating Range Interface levels Logic level specificationsAbsolute Maximum Ratings -Not Functional 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 combinationsDefinitions Audio Section OverviewGenerality SelectionElectrical Characteristics Input lines microphoneOutput lines speaker EarMT BuffersGeneral Purpose I/O NotLogic level specifications Using a Gpio Pad as Output Using a Gpio Pad as Input Using the Alarm Output GPIO6 Using the Buzzer Output GPIO7 Indication of network service availability LED status Device StatusOperating Range VAUX1 power supply VAUX1 power outputRTC 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
Top Page Image Contents