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Applicant: Motorola, INC
2.8.8.3
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
-
VCC
37
ADC1
43
ADC2
47
ADC3
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
Sampling
Operating range
Range
Resolution
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
Analog Ground
Description
Power supply A/D
General Purpose A/D
General Purpose A/D
General Purpose A/D / Battery Temperature A/D
Motorola General Business Use
Page 30 of 36
C24 Hardware Interface Manual
Typ
Max
Min
3.0
4.4
10
FCC ID: IHDP56JE1
Version 0.3
Units
V
mV
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