User Manual

G610 GPRS Module Hardware User Manual Page 12 of 47
 BATT voltage A/D inside
3.1.3 GSM Transceiver Block
 3 gain stages for the low GSM band and high GSM band
 850/900/1800/1900 MHz
 RF receiver, which includes LNAs, Mixers, VCOs, I/Q outputs and buffers.
 Signal processing IC for transmit and receive GSM data processing.
 FEM - Front End Module.
 Includes a harmonic filter and antenna switch
 Filter - Dual-band SAW filter that selects the required receive band.
3.2 Operating Modes
The G610 incorporates several operating modes. Each operating mode is different in the active
features and interfaces.
The table summarizes the general characteristics of the G610 operating modes and provides
general guidelines for operation.
Operating
Modes
Description Features
Not Powered
BATT & Vbackup supply is
disconnected.
The G610 is off.
Any signals connected to the interface
connector must be set low or tri-state.
Power off
Mode
Val
id BATT supply but not
power on.
After reset module. Vbackup
output and VDD is off.
The G610 MCU/DSP/RF is Off.
The PMU is operating in RTC mode.
Any signals connected to the interface
connector must be set low or tri-state.
RTC Mode
Power off mode
BATT
supply is
disconnected. But valid
Vbackup supply
The G610 MCU/DSP/RF is Off.
The PMU is operating in RTC mode.
Any signals connected to the interface
connector must be set low or tri-state.
Idle Mode
Power on is succeeded and
VDD output.
CTS_N and DSR_N signals
are enabled (low).
The G610 is fully active, registered to the
GSM/GPRS network and ready to
communicate.
This is the default power-on mode.