User's Manual

UC864-G Hardware User Guide

DRAFT

- 29/10/07

13 DAC and ADC section

13.1 DAC Converter(TBD)

13.1.1 Description

The

UC864-G module provides a Digital to Analog Converter. The signal (named DAC_OUT) is

available on pin 40 of the

UC864-G module

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

The on board DAC is a 16-bit converter, able to generate a analogue value based a specific input in

the range from 0 up to 65535. However, an external low-pass filter is necessary

Min Max Units

Voltage range (filtered) 0 2,6 Volt

Range 0 65535 Steps

The precision is 16 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 / 65535

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..65535 - 16 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.