a5191hrt AMI Semiconductor, Inc., a5191hrt Datasheet

a5191hrt

Manufacturer Part Number

a5191hrt

Description

Amis Hart Modem

Manufacturer

AMI Semiconductor, Inc.

Datasheet

1.A5191HRT.pdf (11 pages)

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Current page: 1 of 11
Download datasheet (239Kb)

www.amis.com

A A 5 5 1 1 9 9 1 1 H H R R T T A A M M I I S S H H A A R R T T ™ ™ M M o o d d e e m m

A A M M I I S S e e m m i i c c o o n n d d u u c c t t o o r r - - R R e e v v . . 2 2 . . 0 0 , , M M a a r r . . 0 0 5 5

1.0 Features

• Can be used in designs presently using the SYM20C15

• Single-chip, half-duplex 1200 bits per second FSK modem

• Bell 202 shift frequencies of 1200Hz and 2200Hz

• 3.3V - 5.0V power supply

• Transmit-signal wave shaping

• Receive band-pass filter

• Low power: optimal for intrinsically safe applications

• CMOS compatible

• Internal oscillator requires 460.8kHz crystal or ceramic resonator

• Meets HART physical layer requirements

• Industrial temperature range of -40°C to +85°C

• Available in 28-pin PLCC and 32-pin LQFP packages

2.0 Description

The A5191HRT 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 A5191HRT is pin-compatible with the SYM20C15. See the Pin Description and Functional

Description sections for details on pin compatibility with the SYM20C15.

The A5191HRT uses phase continuous frequency shift keying (FSK) at 1200 bits per second. To conserve power the receive circuits are disabled during

transmit operations and vice versa. This provides the half-duplex operation used in HART communications.

Figure 1: 28-Pin PLCC Pinout Diagrams (green & non-green)

Figure 2: 32-Pin LQFP Pinout Diagrams (green & non-green)

Data Sheet

Related parts for a5191hrt

a5191hrt Summary of contents

Page 1

... Description sections for details on pin compatibility with the SYM20C15. The A5191HRT uses phase continuous frequency shift keying (FSK) at 1200 bits per second. To conserve power the receive circuits are disabled during transmit operations and vice versa. This provides the half-duplex operation used in HART communications. ...

Page 2

... www.amis.com Table 2: Pinout Summary 32-Pin LQFP, A5191HRTL/Lg (12197-503/507 ...

Page 3

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Page 4

... ™ ™ 4.0 Functional Description The A5191HRT is a functional equivalent of the SYM20C15 HART Modem. It contains a transmit data modulator and signal shaper, carrier detect circuitry, analog receiver and demodulator circuitry and an oscillator, as shown in Figure 4. ...

Page 5

... 4.4.1 Voltage References The A5191HRT requires two voltage references, IAREF and ICDREF. IAREF sets the dc operating point of the internal operational amplifiers and comparators. A 1.235 V IAREF ...

Page 6

... External to the A5191HRT, the filter exhibits a three-pole, high-pass filter at 624Hz and a one-pole, low-pass filter at 2500Hz. Internally, the A5191HRT has a high-pass pole at 35Hz and a low-pass pole at 90kHz. The low-pass pole can vary as much as ±30 percent. The input impedance of the entire filter is greater than 150MW at frequencies below 50kHz. ...

Page 7

... ™ ™ The A5191HRT requires a 460.8kHz clock signal on OXTL. This can be provided by an external clock or external components may be connected to the A5191HRT internal oscillator. ...

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Page 11

... AMI Semiconductor's products are intended for use in commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment, are specifically not recommended without additional processing by AMIS for such applications. Copyright ©2005 AMI Semiconductor, Inc ...

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