User's Guide

UC864-E-AUTO / AWS-AUTO Hardware User Guide

1vv0300795 Rev.11 – 2010/11/18

13. DAC and ADC section

DAC and ADC sectionDAC and ADC section

DAC and ADC section

13.1. DAC Converter

13.1.1. Description

The UC864-E-AUTO / AWS-AUTO module provides a Digital to Analog Converter. The

signal (named DAC_OUT) is available on pin 40 of the UC864-E-AUTO / AWS-AUTO

module and on pin 17 of PL102 on EVK2 Board (KS101C).

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

MinMin

Min

Max

MaxMax

Max

Units

UnitsUnits

Units

Voltage range (filtered) 0 2.6 Volt

Range 0 1023 Steps

The precision is 1023 steps, 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.

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:

NOTE: NOTE:

NOTE:

The DAC frequency is selected internally. D/A converter must not be used during

POWERSAVING.