User's Manual

GC864 Hardware User Guide
1vv0300874 Rev.0 – 2010-01-25
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved. Page 55 of 64
11.12. DAC Converter
11.12.1. Description
Pin Signal I/O Function
Internal
Pull up
Type
DAC Converter
40 DAC_OUT AO Digital/Analog converter output D/A
The GC864-QUAD V2 / GC864-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 Max 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 voltage = 2 * value / 1023
DAC_OUT line must be integrated (for example with a low band pass filter) in order to
obtain an analog voltage.
11.12.2. Enabling DAC
The AT command below is available to use the DAC function:
AT#DAC[=<enable>[,<value>]]
<value> – scale factor of the integrated output voltage (0–1023, with 10 bit precision),
and it must be present if <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.