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©

 Semiconductor Components Industries, LLC, 2012

October, 2012 

 Rev. 4

1

Publication Order Number:

EVBUM2047/D

NCN5192NGEVB

NCN5192NG Evaluation

Board User's Manual

Introduction

The NCN5192NGEVB includes all external components

needed for operating NCN5192 and demonstrates the small
PCB surface area such an implementation requires. The
EVB allows easy design of HART implementations using
NCN5192.

Overview

The NCN5192 is a single-chip, CMOS modem for use in

highway addressable remote transducer (HART) field
instruments and masters. The modem and a few external
passive components provide all of the functions needed to
satisfy HART physical layer requirements including
modulation, demodulation, receive filtering, carrier detect,
and transmit-signal shaping.

The NCN5192 also includes an internal 16-bit

sigma-delta modulation DAC for easy implementation of
slave devices. An SPI bus provides easy communication to
this DAC and internal registers.

Features

Single-chip, Half-duplex 1200 bits per Second FSK
Modem

Bell 202 Shift Frequencies of 1200 Hz and 2200 Hz

3.0 V 

 5.5 V Power Supply

Transmit-signal Wave Shaping

Receive Band-pass Filter

Low Power: Optimal for Intrinsically Safe Applications

Compatible with 3.3 V or 5 V Microcontroller

Internal Oscillator with 1.84 MHz Crystal

Meets HART Physical Layer Requirements

Includes 16-bit DAC for Slave Implementation

Industrial Temperature Range of 

40

°

C to +85

°

C

Available in 32-pin QFN

Applications

HART Multiplexers

HART Modem Interfaces

4-20 mA Loop Powered Transmitters

Figure 1. NCN5192NGEVB Evaluation Board

http://onsemi.com

EVAL BOARD USER’S MANUAL

www.BDTIC.com/ON/

Содержание NCN5192NGEVB

Страница 1: ...g carrier detect and transmit signal shaping The NCN5192 also includes an internal 16 bit sigma delta modulation DAC for easy implementation of slave devices An SPI bus provides easy communication to...

Страница 2: ...modulator and demodulator module communicating with a UART without internal buffer as well as an internal 16 bit sigma delta DAC The NCN5192 requires some external filter components and a 460 8 kHz 92...

Страница 3: ...NCN5192NGEVB http onsemi com 3 NCN5192NGEVB DESCRIPTION Schematic Diagram BOM List Figure 2 NCN5192NGEVB Schematic www BDTIC com ON...

Страница 4: ...kW 0603 7 R15 R39 0 R 0603 2 R25 560 kW 0603 1 R26 R27 R28 R32 R35 470 kW 0603 5 R29 33 kW 0603 1 R33 680 kW 0603 1 R34 3M3 0603 1 R37 4k7 0603 1 TP5 TP6 TP7 TP8 Do Not Populate DNP 4 U1 ON Semicondu...

Страница 5: ...es an internal voltage supervisor This will guarantee correct operation of the digital circuitry during start up All that is required for using this supervisor is an external resistor divider R25 R26...

Страница 6: ...e is recommended For NCN5192NGEVB a series regulator is used with an internal reference of 1 25 V The chosen regulator has a very low supply current to optimize power usage Using a series regulator is...

Страница 7: ...70 100 mA less However care must be taken that this external signal has the required frequency accuracy 1 Duty cycle of the clock signal is specified between 40 and 60 No errors were observed during...

Страница 8: ...e 10 The skew time is measured from the initial falling edge of the start bit to the center of the 11th bit cell This 21 skew by itself is a relatively good result However there is another error sourc...

Страница 9: ...used for the implementation of a slave analog transmitter The included DAC has a Sigma Delta topology This means that the output of the DAC is constantly switching between 0 V en DACREF 3 V on the eva...

Страница 10: ...larger output range is achieved but at the cost of accuracy In non RTZ mode 16 bit accuracy will be harder to obtain To achieve maximum accuracy of the DAC it is also advised to use a separate low noi...

Страница 11: ...is a band pass filter based on a Sallen Key topology allowing only frequencies around the HART signal frequencies to pass through For a more detailed description of the filter see the user manual of A...

Страница 12: ...sistor R3 should be placed on the negative input and dimensioned to approach the impedance seen by the positive terminal The amplifier will then determine the current flowing through the loop by chang...

Страница 13: ...and range of the ADC A HART Master can have a sense resistor ranging from 230 W to 600 W Increasing the sense resistor will result in higher amplitude HART signal received but will also reduce the vol...

Страница 14: ...NCN5192NGEVB http onsemi com 14 Figure 19 Sample Master Implementation www BDTIC com ON...

Страница 15: ...surgical implant into the body or other applications intended to support or sustain life or for any other application in which the failure of the SCILLC product could create a situation where persona...

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