DS8500_09 MAXIM [Maxim Integrated Products], DS8500_09 Datasheet

DS8500_09

Manufacturer Part Number

DS8500_09

Description

HART Modem

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.DS8500_09.pdf (7 pages)

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Download datasheet (171Kb)

The DS8500 is a single-chip modem with Highway

Addressable Remote Transducer (HART) capabilities

and satisfies the HART physical layer requirements.

The device integrates the modulation and demodulation

of the 1200Hz/2200Hz FSK signal, has very low power

consumption, and needs only a few external compo-

nents due to the integrated digital signal processing.

The input signal is sampled by an analog-to-digital con-

verter (ADC), followed by a digital filter/demodulator.

This architecture ensures reliable signal detection in

noisy environments. The output digital-to-analog con-

verter (DAC) generates a sine wave and provides a

clean signal with phase-continuous switching between

1200Hz and 2200Hz. Low power is achieved by dis-

abling the receive circuits during transmit and vice

versa. The DS8500 is ideal for low-power process con-

trol transmitters.

Rev 1; 2/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

TOP VIEW

*EXPOSED PAD.

D_OUT

4–20mA Loop-Powered Transmitters for

Temperature, Pressure, Flow, and Level

Measurement

HART Multiplexers

HART Modem Interface Connectivity

DGND

D_IN

________________________________________________________________ Maxim Integrated Products

(5mm

THIN QFN

General Description

DS8500

Pin Configuration

5mm)

*EP

Applications

10 XCEN

DGND

XTAL2

XTAL1

RTS

♦ Single-Chip, Half-Duplex, 1200bps FSK

♦ Digital Signal Processing Provides Reliable Input

♦ Sinusoidal Output Signal with Lowest Harmonic

♦ Few External Components Enable a Space-Saving

♦ Standard Component 3.6864MHz Crystal

♦ Complies to HART Physical Layer Requirements

♦ 2.7V to 3.6V Operating Voltage

♦ 285µA (max) Current Consumption

♦ Space-Saving, 5mm x 5mm x 0.8mm, 20-Pin TQFN

+ Denotes a lead(Pb)-free/RoHS-compliant package.

* EP = Exposed pad.

DS8500-JND+

Modulation and Demodulation

Signal Detection in Noisy Conditions

Distortion

Solution

Package

PART

-40°C to +85°C

TEMP RANGE

Ordering Information

HART Modem

PIN-PACKAGE

20 TQFN-EP*

Features

Related parts for DS8500_09

DS8500_09 Summary of contents

Page 1

Rev 1; 2/09 General Description The DS8500 is a single-chip modem with Highway Addressable Remote Transducer (HART) capabilities and satisfies the HART physical layer requirements. The device integrates the modulation and demodulation of the 1200Hz/2200Hz FSK signal, has very low ...

Page 2

HART Modem ABSOLUTE MAXIMUM RATINGS Voltage Range on All Pins (including AVDD, DVDD) Relative to Ground .................................-0.5V to +3.6V Voltage Range on Any Pin Relative to Ground Except AVDD, DVDD .............-0. Stresses beyond those listed under “Absolute Maximum ...

Page 3

PIN NAME 1, 2 DVDD Digital Supply Voltage 3, 9, 16, DGND Digital Ground 17, 18 Active-Low Reset, Digital Input/Output. This pin includes an internal pullup resistor and is driven low output when an internal reset condition ...

Page 4

HART Modem Introduction to HART HART is a backward-compatible enhancement to exist- ing 4–20mA instrumentation networks that allows two- way, half-duplex, digital communication with a microcontroller-based field device. The digital signal is encoded on top of the existing instrumentation signal. ...

Page 5

D_IN START FSK_OUT Figure 2. Actual DS8500 Modulator Waveform FSK_IN D_OUT Figure 3. Actual DS8500 Demodulator Waveform _______________________________________________________________________________________ 8-BIT DATA START 8-BIT DATA 1200bps/833μs ONE UART CHARACTER (START, 8 DATA BITS, PARITY, STOP) HART Modem STOP PARITY STOP PARITY ...

Page 6

HART Modem 3.6864MHz XTAL1 3.6864MHz CRYSTAL CRYSTAL OSCILLATOR XTAL2 XCEN OCD Rx DEMODULATOR D_OUT RTS Tx MODULATOR D_IN MICROCONTROLLER Figure 4. Typical Application Circuit For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 20 TQFN ...

Page 7

REVISION REVISION NUMBER DATE 0 10/08 Initial release. In the Electrical Characteristics table, changed the Frequency of FSK_OUT parameter units from kHz to Hz. 1 2/09 Added the EP description to the Pin Description table. Maxim cannot assume responsibility for ...

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