User's Manual

GE864
GE864GE864
GE864-
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-QUAD V2 / GE864
QUAD V2 / GE864QUAD V2 / GE864
QUAD V2 / GE864-
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-DUAL V2 Hardware User Guide
DUAL V2 Hardware User GuideDUAL V2 Hardware User Guide
DUAL V2 Hardware User Guide
1vv0300875 Rev.1 – 2010-03-29
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved. Page 59 of 73
11.11. DAC Converter
11.11.1. Description
Ball
BallBall
Ball Signal
SignalSignal
Signal I/O
I/OI/O
I/O Function
FunctionFunction
Function
Internal
InternalInternal
Internal
Pull up
Pull upPull up
Pull up
Type
TypeType
Type
DAC Converter
DAC ConverterDAC Converter
DAC Converter
C7
C7C7
C7 DAC_OUT AO Digital/Analog converter output D/A
The GE864-QUAD V2 / GE864-DUAL V2 module provides one Digital to Analog
Converter.
The on board DAC is a 10-bit converter, able to generate a analogue value based a
specific input in the range from 0 up to 1023. However, an external low-pass filter is
necessary.
Min
MinMin
Min Max
MaxMax
Max Units
UnitsUnits
Units
Voltage range (filtered) 0 2,6 Volt
Range 0 1023 Steps
The precision is 10 bits, so if we consider that the maximum voltage is 2V, the
integrated voltage could be calculated with the following formula:
Integrated output vo
Integrated output voIntegrated output vo
Integrated output voltage = 2 * value / 1023
ltage = 2 * value / 1023ltage = 2 * value / 1023
ltage = 2 * value / 1023
DAC_OUT line must be integrated (for example with a low band pass filter) in order to
obtain an analog voltage.
11.11.2. Enabling DAC
The AT command below is available to use the DAC function:
AT#DAC[=<enable>[,<value>]]
AT#DAC[=<enable>[,<value>]]AT#DAC[=<enable>[,<value>]]
AT#DAC[=<enable>[,<value>]]
<value>
<value><value>
<value> – scale factor of the integrated output voltage (0–1023, with 10 bit precision),
and it must be present if <enable>=1
<enable>=1<enable>=1
<enable>=1.
Refer to SW User Guide or AT Commands Reference Guide for the full description of
this function.
Refer to SW User Guide or AT Commands Reference Guide for the full description of
this function.