DCS WDU models User's Guide download pdf (Page 65)

UC864-E/G/WD/WDU Hardware User Guide

1vv0300766a Rev.4

- 03/02/09

12. DAC and ADC section

12.1. DAC Converter

12.1.1. Description

The UC864-E/G/WD/WDU module provides a Digital to Analog Converter. The signal

(named DAC_OUT) is available on pin 40 of the UC864-E/G/WD/WDU module and

on pin 17 of PL102 on EVK2 Board (CS1203).

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 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.

12.1.2. 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.

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DCS WDU models User's Guide Page 65