Technical information

A/D Interface
40 G24-L Module Hardware Description November 15, 2008
Important: In the G24-LC Charger Model configuration, the ADC3 signal is allocated to a
battery temperature measurement sensor and is not intended for general use.
Table 2-17 gives the GPAD specifications.
Power Supply A/D
The main power supply (VCC) is constantly monitored internally by the G24-L through a
dedicated A/D signal, which is not accessible on the interface connector.
The measured VCC level can be read and monitored through the AT+MMAD command, which
returns the measured VCC level in Volts times 100.
For example, a measured supply level of 3.65 Volts will be presented as 365 by the MMAD
command.
Important: During GSM transmissions the power supply may suffer voltage drops. This can
cause frequent and wide changes in the power supply A/D measurements. This
should be taken into account when reading and operating the G24-L power supply
A/D.
Battery Temperature A/D
In the G24-LC Battery Charging Model the ADC3 signal is allocated specifically to the battery
temperature measurement, which is required during the charging process.
Table 2-17:
GPAD Specifications
Parameter Conditions Min Typ Max Unit
Maximum
Input Voltage
Operating range -0.1 2.75 V
Measurement
Vo l t a g e
ADC range 0 2.66 V
Resolution 10 mV
Table 2-18: Supply A/D Specifications
Parameter Conditions Min Typ Max Unit
Sampling
Range
Operating range 3.0 4.5 V
Resolution 10 mV