User's Guide

LE866 HARDWARE USER GUIDE 1vv0301210 Rev.0 Preliminary 2015-09-02 43 of 68
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DAC Converter
The LE866 provides a Digital to Analog Converter. The signal (named DAC_OUT) is available on pin
E4 of the LE866.
The on board DAC is a 10 bit converter, able to generate an analogue value based on a specific input
in the range from 0 up to 1023. However, an external low-pass filter is necessary
The following table is showing the ADC characteristics:
Item
Min
Max
Unit
Voltage range (filtered)
0
1.8
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.
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.