User's Guide

HE863 Family Hardware User Guide
1vv0300891 Rev.5
- 2011-03-18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights
Reserved. Page 39 of 89
HE863-EUG/NAG/AUG only
Mode Average(mA) Mode Description
IDLE mode with GPS ON full power
mode*
Standby mode;
no call in progress;
GPS ON
AT+CFUN=1
WCDMA 62
GSM 61
AT+CFUN=4
WCDMA 61
GSM 61
AT+CFUN=5
WCDMA 54/53*
GSM 54/53*
WCDMA TX and RX mode with
G
PS ON
full power mode*
WCDMA Voice 630 WCDMA voice channel
WCDMA Data 630 WCDMA data channel
HSDPA 710 HSDPA data channel
HSUPA 630 HSUPA data channel
GSM TX and RX mode with GPS ON
full power mode*
GSM Voice 280 GSM voice channel
GPRS Class12 670 GPRS data channel
EDGE Class12 500 EDGE data channel
* except external active GPS antenna
TIP:
The electrical design for the Power supply must be made
ensuring that it will be capable of a peak current output of
at least 2A.
In GSM/GPRS mode, RF transmission is not continuous and it is
packed into bursts at a base frequency of about 216 Hz, and
the relative current peaks can be as high as about 2A.
Therefore the power supply has to be designed in order to
withstand these current peaks without big voltage drops; this
means that both the electrical design and the board layout
must be designed for this current flow. If the layout of the
PCB is not well designed, a strong noise floor is generated on
the ground; this will reflect on all the audio paths producing
an audible annoying noise at 216 Hz; if the voltage drops
during the peak, current absorption is too much. The device
may even shut down as a consequence of the supply voltage drop.