C24 Hardware Interface Manual
Version 0.3
2.8.8.3 Analog Ground
The module’s interface incorporates a dedicated analog ground contact, AGND pin 61, which is internally
connected to the module’s ground. The AGND signal is intended to provide a separate ground connection
for the application’s external audio devices and circuits.
This signal provides an isolated ground connection directly from the module, which is separated from the
noisy digital ground of the customer application.
2.9 A/D Interface
The module includes 4 Analog to Digital Converter (ADC) signals with 8-bit resolution, for environmental
and electrical measurements.
The A/D signals operation and reporting mechanism is defined by the AT+MMAD command.
The following section describes A/D interface
TABLE 19 – A/D Interface signals
Pin (s) Signal Name Description
- VCC Power supply A/D
37 ADC1 General Purpose A/D
43 ADC2 General Purpose A/D
47 ADC3 General Purpose A/D / Battery Temperature A/D
2.9.1 Power Supply A/D
The main power supply (VCC) is sampled internally by the module through a dedicated A/D port, which is
not accessible on the interface connector.
TABLE 20 – Supply A/D Specifications
Parameter Conditions Min
Typ Max Units
Sampling
Operating range 3.0 4.4 V
Range
Resolution 10 mV
2.9.2 Battery Temperature A/D
The module incorporates a dedicated A/D port for battery thermistor measurements. This feature is
implemented only in the charger model version.
TABLE 21 – Temperature A/D Specifications
Motorola General Business Use
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