Technical information

Chapter 2: Hardware Interface Description
December 15, 2009 G30 - Module Hardware Description 43
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 designing and operating the G30 power supply
A/D interface.
Table 2-18 gives the supply A/D specifications.
General Purpose A/D
The G30 provides 2 general purpose A/D (GPAD) signals for customer application use. Each A/D
signal can monitor a separate external voltage and report its measured level independently to the
application, through the AT command interface.
The GPAD signals measure a DC voltage level of 0 - 1.92 V, which is converted internally to a
12-bit digital value. The user application can monitor the A/D voltage level through the
AT+MADCM command, which returns the measured DC level in Volts times 100.
For example, a measured analog DC level of 1.75 Volts will be presented as 175 by the MADCM
command.
Table 2-19 gives the GPAD specifications.
Table 2-18:
Supply A/D Specifications
Parameter Conditions Min Typ Max Unit
Measurement
Range
3.0 5.18 V
Resolution 10 mV
Table 2-19: GPAD Specifications
Pin #
(81 pin
LGA
interface)
Pin #
(70 pin
connector
interface)
G30
Signal Name
G30
I/O
Function Remarks
36 37 ADC1 I Analog-to-Digital
Converter Input
Resolution: 12 bits
Voltage span: 0V-1.92V
35 43 ADC2 I Analog-to-Digital
Converter Input
Resolution: 12 bits
Voltage span: 0V-1.92V.