User's Guide

HE863 Family Hardware User Guide
1vv0300891 Rev.5
- 2011-03-18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights
Reserved. Page 76 of 89
13. DAC and ADC section
13.1. DAC Converter
13.1.1. Description
The HE863 Family module provides a Digital to Analog Converter.
The signal (named DAC_OUT) is available on BGA Ball S4 of the
HE863 Family module.
The on board DAC is a 16-bit converter, able to generate an
analogue value based on a specific input in the range from 0
up to 65535 but recalibrated in the range from 0 to 1023.
However, an external low-pass filter is necessary.
Min Max Units
Voltage range
(filtered)
0 1.8 Volt
Range 0 1023 Steps
The precision is 1023 steps, so if we consider that the
maximum voltage is 1.8V, the integrated voltage could be
calculated with the following formula:
Integrated output voltage = 1.8 * value / 1023
DAC_OUT line must be integrated (for example with a low band
pass filter) in order to obtain an analog voltage.
13.1.2. Enabling DAC
An AT command is available to use the DAC function. The
command is:AT#DAC[=<enable>[,<value>]]
<value> - scale factor of the integrated output voltage
(0..1023 - 10 bit precision)
it must be present if <enable>=1
Refer to SW User Guide or AT Commands Reference Guide for the
full description of this function.
NOTE:
The DAC frequency is selected internally. D/A converter must
not be used during POWERSAVING.