Telit Communications S.p.A. GE864Q2B ユーザーズマニュアル

GE864

GE864----QUAD V2 / GE864

QUAD V2 / GE864

QUAD V2 / GE864----DUAL V2 Hardware User Guide

DUAL V2 Hardware User Guide

1vv0300875 Rev.1 – 2010-03-29

Page 59 of 73

11.11.

DAC Converter

11.11.1.

Description

Ball

Signal

I/O

I/O Function

Function

Internal

Internal
Pull up

Pull up

Type

DAC Converter

DAC_OUT

AO Digital/Analog converter output

D/A

The GE864-QUAD V2 / GE864-DUAL V2 module provides one Digital to Analog
Converter.

The on board DAC is a 10-bit converter, able to generate a analogue value based a
specific input in the range from 0 up to 1023. However, an external low-pass filter is
necessary.

Min

Max

Units

Voltage range (filtered)

2,6

Volt

Range

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 vo

Integrated output voltage = 2 * value / 1023

ltage = 2 * value / 1023

DAC_OUT line must be integrated (for example with a low band pass filter) in order to
obtain an analog voltage.

11.11.2.

Enabling DAC

The AT command below is available to use the DAC function:

AT#DAC[=<enable>[,<value>]]

<value>

–

scale factor of the integrated output voltage (0

–

1023, with 10 bit precision),

and it must be present if <enable>=1

<enable>=1

<enable>=1.

Refer to SW User Guide or AT Commands Reference Guide for the full description of
this function.