Power Consumption - Motorola G24 Developer's Manual

It is recommended that the voltage drops during a transmit burst will not exceed 300mV,
measured on the G24 interface connector. In any case, the G24 supply input must not drop below
the minimum operating level during a transmit burst. Dropping below the minimum operating
level may result in a low voltage detection, which will initiate an automatic power-off.
To minimize the losses and transients on the power supply lines, it is recommended to follow
these guidelines:
•
Use a 1000 uF, or greater, low ESR capacitor on the G24 supply inputs. The capacitor should
be located as near to the G24 interface connector as possible.
•
Use low impedance power source, cabling and board routing.
•
Use cabling and routing as short as possible.
•
Filter the G24 supply lines using filtering capacitors, as described in

Power Consumption

Table 2-4
current ratings refer to the overall G24 current consumption over the VCC supply.
Measurements were taken under the following conditions:
•
VCC = 3.6 V
•
Operating temperature 25°C
•
Registered to a GSM network
The actual current ratings may vary from the listed values due to changes in the module's
operating and environment conditions. This includes temperature, power supply level and
application interface settings
.
January 1, 2006
Table 2-3: Recommended Power Supply Filtering
Capacitor
1000 uF GSM Transmit current
serge
10 nF, 100 nF Digital switching noise Filters digital logic noises
8.2 pF, 10 pF 1800/1900 MHz GSM
bands
33 pF, 39 pF 850/900 MHz GSM
bands
specifies typical G24 current consumption ratings in various operating modes. The
Module Hardware Description
Chapter 2: Hardware Interface Description
Usage Description
Minimizes power supply
losses during transmit
bursts.
Use maximum possible
value.
from clocks and data sources.
Filters transmission EMI.
Filters transmission EMI.
Table 2-3.
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