User's Manual
Table Of Contents
HC25 Hardware Interface Overview
3 Application Interface
16
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HC25_HO_v00.220 Page 16 of 39 2007-03-20
Confidential / Preliminary
3 Application Interface
HC25 is equipped with a 50-pin board-to-board connector that connects to the external appli-
cation and incorporates several sub-interfaces: power supply, USB interface, UICC/SIM inter-
face, analog audio interface, as well as various status and control lines (see also Chapter 2).
3.1 Operating Modes
The table below briefly summarizes the various operating modes referred to in the following
chapters.
Table 5: Overview of operating modes
Mode Function
Normal
operation
GSM /
GPRS / UMTS /
HSDPA SLEEP
Power saving mode set automatically when no call is in progress and
the USB connection is suspended by host or not present.
GSM IDLE Software is active. Once registered to the GSM network, paging with
BTS is carried out in order to achieve synchrony with the GSM network.
The repetition rate depends on the parameter BSPA_Multiframe. The
module is ready to send and receive.
GSM TALK/
GSM DATA
Connection between two subscribers is in progress. Power consump-
tion depends on the GSM network coverage and several connection
settings (e.g. DTX off/on, FR/EFR/HR, hopping sequences and
antenna connection). The following applies when power is to be mea-
sured in TALK_GSM mode: DTX off, FR and no frequency hopping,
otherwise same as for IDLE measurements.
GPRS IDLE Module is attached and ready for GPRS data transfer, but no data is
currently sent or received.
GPRS DATA GPRS data transfer in progress. Power consumption depends on net-
work settings (e.g. power control level), uplink / downlink data rates and
GPRS configuration (e.g. used multislot settings).
EGPRS DATA EGPRS data transfer in progress. Power consumption depends on net-
work settings (e.g. power control level), uplink / downlink data rates and
EGPRS configuration (e.g. used multislot settings).
UMTS /
HSDPA IDLE
Module is attached and ready for UMTS / HSDPA data transfer, but no
data is currently sent or received.
UMTS TALK/
UMTS DATA
UMTS data transfer in progress. Power consumption depends on net-
work settings (e.g. TPC Pattern) and data transfer rate.
HSDPA DATA HSDPA data transfer in progress. Power consumption depends on net-
work settings (e.g. TPC Pattern) and data transfer rate.
Power
Down
The internal power section is shut down. The SW on the module is not active. The interfaces
are not accessible.